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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2018	Aug. 03, 2018
Entity Information [Line Items]
Entity Registrant Name	WORKIVA INC
Entity Central Index Key	0001445305
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Amendment Flag	false
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Class A Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		33,526,550
Class B Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		9,786,484

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 57,495	$ 60,333
Marketable securities	23,216	16,364
Accounts receivable, net of allowance for doubtful accounts of $590 and $388 at June 30, 2018 and December 31, 2017, respectively	39,088	28,800
Deferred commissions	4,844	2,376
Other receivables	801	975
Prepaid expenses	8,229	6,444
Total current assets	133,673	115,292
Property and equipment, net	39,338	40,444
Deferred commissions, non-current	6,462	0
Intangible assets, net	1,196	1,118
Other assets	1,025	861
Total assets	181,694	157,715
Current liabilities
Accounts payable	4,688	3,060
Accrued expenses and other current liabilities	30,979	20,212
Deferred revenue	118,490	104,684
Deferred government grant obligation	42	217
Current portion of capital lease and financing obligations	1,160	1,168
Total current liabilities	155,359	129,341
Deferred revenue, non-current	21,835	22,709
Deferred government grant obligation	267	278
Other long-term liabilities	4,056	3,896
Capital lease and financing obligations	17,841	18,425
Total liabilities	199,358	174,649
Stockholders’ deficit
Preferred stock, $0.001 par value per share, 100,000,000 shares authorized, no shares issued and outstanding	0	0
Additional paid-in-capital	270,560	248,289
Accumulated deficit	(288,342)	(265,337)
Accumulated other comprehensive income	75	72
Total stockholders’ deficit	(17,664)	(16,934)
Total liabilities and stockholders’ deficit	181,694	157,715
Class A Common Stock
Stockholders’ deficit
Common stock	33	32
Class B Common Stock
Stockholders’ deficit
Common stock	$ 10	$ 10

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Allowance for doubtful accounts	$ 590	$ 388
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Class A Common Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	33,275,738	32,165,407
Common stock, shares outstanding	33,275,738	32,165,407
Class B Common Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	9,786,484	10,203,371
Common stock, shares outstanding	9,786,484	10,203,371

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue
Total revenue	$ 59,130	$ 49,391	$ 119,036	$ 101,295
Cost of revenue
Total cost of revenue	16,296	14,286	32,807	28,504
Gross profit	42,834	35,105	86,229	72,791
Operating expenses
Research and development	20,718	16,239	40,845	31,775
Sales and marketing	22,252	19,787	43,258	38,500
General and administrative	21,654	8,943	33,422	18,364
Total operating expenses	64,624	44,969	117,525	88,639
Loss from operations	(21,790)	(9,864)	(31,296)	(15,848)
Interest expense	(449)	(475)	(899)	(930)
Other income, net	492	176	835	788
Loss before provision for income taxes	(21,747)	(10,163)	(31,360)	(15,990)
Provision for income taxes	21	33	26	42
Net loss	$ (21,768)	$ (10,196)	$ (31,386)	$ (16,032)
Net loss per common share:
Basic and diluted (in dollars per share)	$ (0.50)	$ (0.25)	$ (0.73)	$ (0.39)
Weighted-average common shares outstanding - basic and diluted (in shares)	43,234,655	41,429,691	43,048,110	41,270,038
Subscription and support
Revenue
Total revenue	$ 48,837	$ 40,980	$ 95,307	$ 80,520
Cost of revenue
Total cost of revenue	8,637	7,758	17,439	15,395
Professional services
Revenue
Total revenue	10,293	8,411	23,729	20,775
Cost of revenue
Total cost of revenue	$ 7,659	$ 6,528	$ 15,368	$ 13,109

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (21,768)	$ (10,196)	$ (31,386)	$ (16,032)
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment, net of income tax benefit of $0 for both of the three months ended June 30, 2018 and 2017, and net of income tax benefit of $0 and $2 for the six months ended June 30, 2018 and 2017, respectively	42	(52)	31	(86)
Unrealized gain (loss) on available-for-sale securities, net of income tax benefit (expense) of $0 for both of the three months ended June 30, 2018 and 2017, and net of income tax (expense) of $0 and ($2) for the six months ended June 30, 2018 and 2017, respectively	17	(2)	(28)	0
Other comprehensive income (loss), net of tax	59	(54)	3	(86)
Comprehensive loss	$ (21,709)	$ (10,250)	$ (31,383)	$ (16,118)

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustment, tax (expense) benefit	$ 0	$ 0	$ 0	$ 2
Unrealized gain on available-for-sale securities, tax benefit (expense)	$ 0	$ 0	$ 0	$ (2)

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities
Net loss	$ (21,768)	$ (10,196)	$ (31,386)	$ (16,032)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities
Depreciation and amortization	876	867	1,748	1,758
Stock-based compensation expense	10,465	4,397	16,370	8,536
Provision for doubtful accounts	139	146	183	432
(Accretion) amortization of premiums and discounts on marketable securities, net	(15)	28	3	59
Recognition of deferred government grant obligation	(100)	(198)	(208)	(736)
Changes in assets and liabilities:
Accounts receivable	(236)	(3,228)	6,306	(542)
Deferred commissions	(2,020)	(149)	(3,669)	(151)
Other receivables	148	(865)	175	(25)
Prepaid expenses and other	(2,020)	(2,830)	(1,789)	(2,026)
Other assets	(110)	36	(168)	13
Accounts payable	(1,294)	(678)	1,383	339
Deferred revenue	8,747	14,398	6,402	18,494
Accrued expenses and other liabilities	4,642	2,254	3,887	(3,557)
Net cash (used in) provided by operating activities	(2,546)	3,982	(763)	6,562
Cash flows from investing activities
Purchase of property and equipment	(210)	(26)	(219)	(147)
Purchase of marketable securities	(11,283)	(2,259)	(11,283)	(6,350)
Maturities of marketable securities	3,900	1,850	4,400	4,851
Purchase of intangible assets	(64)	(58)	(128)	(89)
Net cash used in investing activities	(7,657)	(493)	(7,230)	(1,735)
Cash flows from financing activities
Proceeds from option exercises	3,318	4,709	6,393	5,515
Taxes paid related to net share settlements of stock-based compensation awards	(519)	0	(1,861)	(936)
Proceeds from shares issued in connection with employee stock purchase plan	0	0	1,370	0
Repayment of other long-term debt	0	(20)	0	(20)
Principal payments on capital lease and financing obligations	(294)	(490)	(592)	(787)
Proceeds from government grants	22	22	22	22
Deferred financing costs	0	(10)	0	(10)
Net cash provided by financing activities	2,527	4,211	5,332	3,784
Effect of foreign exchange rates on cash	(85)	82	(177)	94
Net (decrease) increase in cash and cash equivalents	(7,761)	7,782	(2,838)	8,705
Cash and cash equivalents at beginning of period	65,256	52,204	60,333	51,281
Cash and cash equivalents at end of period	57,495	59,986	57,495	59,986
Supplemental cash flow disclosure
Cash paid for interest	435	448	868	747
Cash paid for income taxes, net of refunds	54	27	56	40
Supplemental disclosure of noncash investing and financing activities
Allowance for tenant improvements	105	0	127	0
Purchases of property and equipment, accrued but not paid	$ 254	$ 0	$ 254	$ 0

Organization and Significant Accounting Policies

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Significant Accounting Policies

Organization

Workiva Inc., a Delaware corporation, and its wholly-owned subsidiaries (the “Company” or “we” or “us”) created Wdesk, an intuitive cloud platform that modernizes how people work within thousands of organizations. Wdesk is built on a data management engine, offering controlled collaboration, data connections, granular permissions and a full audit trail. We offer Wdesk solutions for a wide range of use cases in the following markets: finance and accounting, audit and internal controls, risk and compliance, and performance and management reporting. Our operational headquarters are located in Ames, Iowa, with additional offices located in the United States, Europe, and Canada.

We updated our accounting policies on the use of estimates, revenue recognition, deferred revenue, and deferred commissions as a result of our adopting Financial Accounting Standards Board (FASB) guidance issued in accounting standards codification (ASC) 606, Revenue Recognition - Revenue from Contracts with Customers, under the Accounting Standards Update (ASU) 2014-09 (collectively the new revenue standard). Otherwise, there have been no changes to our significant accounting policies described in our Annual Report on Form 10-K for the year ended December 31, 2017, filed with the SEC on February 22, 2018, that have had a material impact on our condensed consolidated financial statements and related notes.

Basis of Presentation and Principles of Consolidation

The financial information presented in the accompanying unaudited condensed consolidated financial statements has been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) and in accordance with rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Accordingly, the financial statements do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. The condensed consolidated balance sheet data as of December 31, 2017 was derived from audited financial statements, but does not include all disclosures required by U.S. GAAP. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments, consisting primarily of normal recurring accruals, necessary for a fair presentation of our financial position and results of operations. The operating results for the three and six months ended June 30, 2018 are not necessarily indicative of the results expected for the full year ending December 31, 2018.

Seasonality has affected our revenue, expenses and cash flows from operations. Revenue from professional services has been higher in the first quarter as many of our customers file their Form 10-K in the first calendar quarter. Sales and marketing expense has been higher in the third quarter due to our annual user conference in September. In addition, the timing of the payments of cash bonuses to employees during the first and fourth calendar quarters may result in some seasonality in operating cash flow. The condensed consolidated financial information should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained in this report and the consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017 filed with the SEC on February 22, 2018.

The unaudited condensed consolidated financial statements include the accounts of Workiva Inc. and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.

Use of Estimates

The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States requires us to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. We base our estimates on historical experience and various other assumptions believed to be reasonable. These estimates include, but are not limited to, the allowance for doubtful accounts, the determination of the relative selling prices of our services, the measurement of material rights, health insurance claims incurred but not yet reported, valuation of available-for-sale marketable securities, useful lives of deferred contract costs, intangible assets and property and equipment, income taxes and certain assumptions used in the valuation of equity awards. While these estimates are based on our best knowledge of current events and actions that may affect us in the future, actual results may differ materially from these estimates.

Revenue Recognition

We generate revenue through the sale of subscriptions to our cloud-based software and the delivery of professional services. We recognize revenue when control of these services is transferred to our customers in an amount that reflects the consideration we expect to be entitled to in exchange for those services.

We determine revenue recognition through the following steps:

• Identification of the contract, or contracts, with a customer

• Identification of the performance obligations in the contract

• Determination of the transaction price

• Allocation of the transaction price to the performance obligations in the contract

• Recognition of revenue when, or as, we satisfy a performance obligation

We report revenue net of sales and other taxes collected from customers to be remitted to government authorities.

Subscription and Support Revenue

We recognize subscription and support revenue on a ratable basis over the contract term beginning on the date that our service is made available to the customer. Our subscription contracts are generally three to 36 months in duration, are billed in advance and are non-cancelable. We consider the access to Wdesk and related support services in a customer contract to be a series of distinct services which comprise a single performance obligation because they are substantially the same and have the same pattern of transfer.

Professional Services Revenue and Customer Options

Professional services revenues primarily consist of fees for document set up, XBRL tagging, and consulting with our customers on business processes and best practices for using Wdesk. We have determined that an agreement to purchase these professional services constitutes an option to purchase services in accordance with ASC 606 rather than an agreement that creates enforceable rights and obligations because of the customer's contractual right to cancel services that have not yet been used. In the limited case of agreements where we determined that the option provides the customer with a material right, we allocate a portion of the transaction price to the material right. Professional service agreements that do not contain a material right are accounted for when the customer exercises its option to purchase additional services.

Revenue is recognized for document set ups when the service is complete and control has transferred to the customer. Revenues from XBRL tagging and consulting services are recognized as the services are performed.

Contracts with Multiple Performance Obligations

Some of our contracts with customers contain multiple performance obligations in the event that we determine a material right exists. For these contracts, we account for the individual performance obligations separately when they are both capable of being distinct, whereby the customer can benefit from the service either on its own or together with other resources that are readily available from third parties or from the Company, and are distinct in the context of the contract, whereby the transfer of the services is separately identifiable from other promises in the contract. If these criteria are not met, the promised services are accounted for as a combined performance obligation. The transaction price is allocated to the separate performance obligations on a relative standalone selling price basis. We determine the standalone selling prices based on our overall pricing objectives, taking into consideration market conditions and entity-specific factors, including the size of our arrangements, length of term, customer demographics and the numbers and types of users within our arrangements.

Deferred Revenue

We typically invoice our customers for subscription and support fees in advance on a quarterly, annual, two- or three-year basis, with payment due at the start of the subscription term. Unpaid invoice amounts for non-cancelable services starting in future periods are included in accounts receivable and deferred revenue. The portion of deferred revenue that we anticipate will be recognized after the succeeding twelve-month period is recorded as non-current deferred revenue, and the remaining portion is recorded as current deferred revenue.

Customer Deposits

As an agreement to purchase professional services constitutes a customer option, fees received in advance of these services being performed are considered customer deposits and are included in accrued expenses and other current liabilities on the condensed consolidated balance sheet. Unpaid invoice amounts for these professional services starting in future periods are excluded from accounts receivable and accrued expenses and other current liabilities.

Deferred Commissions

Sales commissions earned by our sales force are considered incremental and recoverable costs of obtaining a contract with a customer. Sales commissions paid where the amortization period is one year or less are expensed as incurred. All other sales commissions are deferred and then amortized on a straight-line basis over a period of benefit that we have determined to be three years. We determined the period of benefit by taking into consideration our standard contract terms and conditions, rate of technological change and other factors. Amortization expense is included in sales and marketing expense in the accompanying condensed consolidated statements of operations.

Income Taxes

differences that will reverse under current Subpart F rules) for basis differences that upon reversal will be subject to GILTI. We have elected to account for the effects of GILTI in the period incurred and expect to incur an adjustment related to GILTI for the year ended December 31, 2018. This adjustment is offset by a corresponding reduction to the valuation allowance and as a result has zero impact on our effective tax rate. We will continue to refine our calculations as additional guidance is released during the measurement period as permitted by SEC Staff Accounting Bulletin 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act.

Recently Adopted Accounting Pronouncements

In May 2014, FASB issued ASU 2014-09, which amends the guidance in former ASC 605, Revenue Recognition. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Additionally, the guidance requires improved disclosures to help users of financial statements better understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers.

Effective January 1, 2018, we adopted ASU 2014-09 using the modified retrospective method applied to those contracts which were not completed as of January 1, 2018. We recognized the cumulative effect of initially applying the new revenue standard as an adjustment to the opening balance of our accumulated deficit. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods.

The primary impact on accounts receivables and deferred revenue of adopting the new standard relates to recording deferred revenue when payments are due in advance of our performance of subscription based contracts. This recording has resulted in an offsetting increase in accounts receivable and deferred revenue.

The effect of adopting the new standard on accrued expenses and other current liabilities relates to the reclassification of amounts collected in advance related to the purchase of professional services from deferred revenue to accrued expenses and other current liabilities as these agreements to purchase professional services constitute a customer option.

The primary impact of adopting the new standard on our sales and marketing expense relates to the deferral of incremental commission costs of obtaining subscription contracts. Under the previous guidance, we deferred only direct and incremental commission costs to obtain a contract and amortized those costs on a straight-line basis over the lesser of 12 months or the non-cancelable term of the customer contract based on the terms of our commission arrangements. Under the new standard, we defer all incremental commission costs to obtain the contract. We amortize these costs on a straight-line basis over a period of benefit that we have determined to be three years.

The adoption of ASC 606 primarily resulted in an acceleration of revenue as of December 31, 2017, which in turn reduced our existing deferred tax asset for amounts that had previously been included in deferred revenue. Additionally, the amortization of the costs of obtaining a contract has generated additional deferred tax liabilities that ultimately reduced our net deferred tax asset position. As we have provided a full valuation allowance against our net deferred tax assets in the jurisdictions impacted by the adoption of ASC 606, this aggregate impact was offset by a corresponding reduction to the valuation allowance.

The cumulative effect of the changes made to our consolidated January 1, 2018 balance sheet for the adoption of ASU 2014-09 were as follows (in thousands):


	As of December 31, 2017		Adjustments Due to ASU 2014-09		As of January 1, 2018
Assets
Accounts receivable, net	$	28,800	$	16,900	$	45,700
Deferred commissions	2,376		650		3,026
Deferred commissions, non-current	—		4,655		4,655

Liabilities
Accrued expenses and other current liabilities	20,212		6,956		27,168
Deferred revenue	104,684		6,625		111,309
Deferred revenue, non-current	22,709		243		22,952

Equity
Accumulated deficit	$	(265,337)	$	8,381	$	(256,956)

In accordance with the new revenue standard requirements, the impact of adoption on our condensed consolidated balance sheet as of June 30, 2018 and statement of operations for the three and six months ended June 30, 2018 was as follows (in thousands, except per share data):


	As of June 30, 2018
	As Reported		Balances Without Adoption of ASC 606		Effect of Change
Assets
Accounts receivable, net	$	39,088	$	27,029	$	12,059
Deferred commissions	4,844		2,686		2,158
Deferred commissions, non-current	6,462		—		6,462

Liabilities
Accrued expenses and other current liabilities	30,979		24,256		6,723
Deferred revenue	118,490		116,949		1,541
Deferred revenue, non-current	21,835		19,877		1,958

Equity
Accumulated deficit	$	(288,342)	$	(298,799)	$	10,457


	Three months ended June 30, 2018										Six months ended June 30, 2018
	As Reported		Balances Without Adoption of ASC 606		Effect of Change		As Reported		Balances Without Adoption of ASC 606		Effect of Change
Revenues
Subscription and support	$	48,837	$	48,469	$	368	$	95,307	$	94,706	$	601
Professional services	10,293		10,418		(125)		23,729		25,548		(1,819)

Operating expenses
Sales and marketing	22,252		23,930		(1,678)		43,258		46,552		(3,294)

Net loss	$	(21,768)	$	(23,689)	$	1,921	$	(31,386)	$	(33,462)	$	2,076

Net loss per common share
Basic and diluted	$	(0.50)	$	(0.55)	$	0.05	$	(0.73)	$	(0.78)	$	0.05

The adoption of ASC 606 had no impact on our total cash flows from operations.

In May 2017, the FASB issued ASU 2017-09, Compensation – Stock Compensation (Topic 718): Scope of Modification Accounting. This ASU clarifies when to account for a change to the terms or conditions of a share-based payment award as a modification. Under the new guidance, modification accounting is required only if the fair value, the vesting conditions, or the classification of the award (as equity or liability) changes as a result of the change in terms or conditions. The ASU is effective for annual periods beginning after December 15, 2017 and interim periods within those annual periods. Effective January 1, 2018, we adopted this standard. The adoption of this new guidance did not have a material impact on our consolidated financial statements.

In June 2018, the FASB issued ASU 2018-07, Compensation - Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting. This ASU simplifies the accounting for nonemployee share-based payment transactions. Under the new guidance, equity-classified share-based payment awards issued to nonemployees will now be measured on the grant date, instead of the previous requirement to remeasure the awards through performance completion date. Awards that include performance conditions will recognize compensation cost when the achievement of the performance condition is probable, rather than upon achievement of the performance condition. Finally, the current requirement to reassess the classification (equity or liability) for nonemployee awards upon vesting will be eliminated, except for awards in the form of convertible instruments. The ASU is effective for annual periods beginning after December 15, 2018 and interim periods within those annual periods. Early adoption is permitted, including interim periods, but no earlier than the adoption of ASC 606. Effective June 20, 2018, we adopted this standard. The adoption of this new guidance did not have a material impact on our consolidated financial statements.

New Accounting Pronouncements Not Yet Adopted

In February 2016, the FASB issued guidance codified in ASC 842, Leases, which supersedes the guidance in former ASC 840, Leases, to increase transparency and comparability among organizations by requiring recognition of right-of-use assets and lease liabilities on the balance sheet and disclosure of key information about leasing arrangements. The standard will become effective for interim and annual periods beginning after December 15, 2018, with early adoption permitted. In July 2018, the FASB issued

ASU 2018-11, Leases (Topic 842): Targeted Improvements that allows entities to recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. We plan to elect this new transition guidance when we adopt this standard on January 1, 2019. We have formed a team to identify and analyze our existing lease agreements and have begun assessing our lease population for the new standard and evaluating the impact to our consolidated financial statements. We anticipate the standard will have a material impact on our balance sheet.

Supplemental Consolidated Balance Sheet and Statement of Operations Information

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Supplemental Consolidated Balance Sheet and Statement of Operations Information

Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of (in thousands):


	June 30, 2018		December 31, 2017
Accrued vacation	$	6,931	$	6,087
Accrued commissions	3,331		3,297
Accrued bonuses	6,309		4,419
Estimated health insurance claims	1,120		1,090
ESPP employee contributions	1,853		1,419
Customer deposits	6,723		—
Accrued other liabilities	4,712		3,900
	$	30,979	$	20,212

Other Income, net

Other income, net for the three and six months ended June 30, 2018 and 2017 consisted of (in thousands):


	Three months ended June 30,						Six months ended June 30,
	2018		2017		2018		2017
Interest income	$	279	$	129	$	502	$	220
Income from training reimbursement program	100		198		208		736
Other	113		(151)		125		(168)
	$	492	$	176	$	835	$	788

Cash Equivalents and Marketable Securities

6 Months Ended

Jun. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Cash Equivalents and Marketable Securities

At June 30, 2018, marketable securities consisted of the following (in thousands):


	Amortized Cost		Unrealized Gains		Unrealized Losses		Aggregate Fair Value
Money market funds	$	36,517	$	—	$	—	$	36,517
Commercial paper	9,508		—		—		9,508
U.S. treasury debt securities	1,993		—		(6)		1,987
U.S. corporate debt securities	11,812		—		(91)		11,721
	$	59,830	$	—	$	(97)	$	59,733
Included in cash and cash equivalents	$	36,517	$	—	$	—	$	36,517
Included in marketable securities	$	23,313	$	—	$	(97)	$	23,216

At December 31, 2017, marketable securities consisted of the following (in thousands):


	Amortized Cost		Unrealized Gains		Unrealized Losses		Aggregate Fair Value
Money market funds	$	49,452	$	—	$	—	$	49,452
U.S. treasury debt securities	3,083		—		(8)		3,075
U.S. corporate debt securities	13,350		—		(61)		13,289
	$	65,885	$	—	$	(69)	$	65,816
Included in cash and cash equivalents	$	49,452	$	—	$	—	$	49,452
Included in marketable securities	$	16,433	$	—	$	(69)	$	16,364

The following table presents gross unrealized losses and fair values for those marketable securities that were in an unrealized loss position as of June 30, 2018, aggregated by investment category and the length of time that individual securities have been in a continuous loss position (in thousands):


	As of June 30, 2018
	Less than 12 months						12 months or greater
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
U.S. treasury debt securities	$	1,987	$	(6)	$	—	$	—
U.S. corporate debt securities	11,721		(91)		—		—
Total	$	13,708	$	(97)	$	—	$	—

We do not believe any of the unrealized losses represented an other-than-temporary impairment based on our evaluation of available evidence, which includes our intent as of June 30, 2018 to hold these investments until the cost basis is recovered.

Fair Value Measurements

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

We determine the fair values of our financial instruments based on the fair value hierarchy, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value assumes that the transaction to sell the asset or transfer the liability occurs in the principal or most advantageous market for the asset or liability and establishes that the fair value of an asset or liability shall be determined based on the assumptions that market participants would use in pricing the asset or liability. The classification of a financial asset or liability within the hierarchy is based upon the lowest level input that is significant to the fair value measurement. The fair value hierarchy prioritizes the inputs into three levels that may be used to measure fair value:

Level 1 - Inputs are unadjusted quoted prices in active markets for identical assets or liabilities.

Level 2 - Inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument.

Level 3 - Inputs are unobservable inputs based on our assumptions.

Financial Assets

When available, our marketable securities are valued using quoted prices for identical instruments in active markets. If we are unable to value our marketable securities using quoted prices for identical instruments in active markets, we value our investments using broker reports that utilize quoted market prices for comparable instruments. We validate, on a sample basis, the derived prices provided by the brokers by comparing their assessment of the fair values of our investments against the fair values of the portfolio balances of another third-party professional pricing service. As of June 30, 2018, all of our marketable securities were valued using quoted prices for comparable instruments in active markets and are classified as Level 2.

Based on our valuation of our money market funds and marketable securities, we concluded that they are classified in either Level 1 or Level 2 and we have no financial assets measured using Level 3 inputs. The following table presents information about our assets that are measured at fair value on a recurring basis using the above input categories (in thousands):


	Fair Value Measurements as of June 30, 2018										Fair Value Measurements as of December 31, 2017
Description	Total		Level 1		Level 2		Total		Level 1		Level 2
Money market funds	$	36,517	$	36,517	$	—	$	49,452	$	49,452	$	—
Commercial paper	9,508		—		9,508		—		—		—
U.S. treasury debt securities	1,987		—		1,987		3,075		—		3,075
U.S. corporate debt securities	11,721		—		11,721		13,289		—		13,289
	$	59,733	$	36,517	$	23,216	$	65,816	$	49,452	$	16,364

Included in cash and cash equivalents	$	36,517					$	49,452
Included in marketable securities	$	23,216					$	16,364

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Deferred Costs	6 Months Ended
Deferred Costs	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Deferred Costs	Deferred CostsDeferred costs, which primarily consist of costs to obtain contracts with customers, were $11.3 million as of June 30, 2018. Amortization expense for the deferred costs was $2.4 million and $4.4 million for the three and six months ended June 30, 2018, respectively. There was no significant impairment loss in relation to the costs capitalized for the periods presented.

Commitments and Contingencies

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Lease Commitments

As of June 30, 2018, future estimated minimum lease payments under non-cancelable operating leases were as follows (in thousands):


	Operating Leases
Remainder of 2018	$	2,131
2019	3,517
2020	3,270
2021	3,211
2022	2,931
Thereafter	13,287
Total minimum lease payments	$	28,347

There have been no material changes in our future estimated minimum lease payments under non-cancelable capital and financing leases, as disclosed in our Annual Report on Form 10-K for the year ended December 31, 2017.

Litigation

From time to time we may become involved in legal proceedings or be subject to claims arising in the ordinary course of our business. Although the results of litigation and claims cannot be predicted with certainty, we currently believe that the final outcome of any currently pending legal proceedings to which we are a party will not have a material adverse effect on our business, operating results, financial condition or cash flows. Regardless of the outcome, litigation can have an adverse impact on us because of defense and settlement costs, diversion of management resources and other factors.

Stock-Based Compensation

6 Months Ended

Jun. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

We grant stock-based incentive awards to attract, motivate and retain qualified employees, non-employee directors and consultants, and to align their financial interests with those of our stockholders. We utilize stock-based compensation in the form of restricted stock awards, restricted stock units, options to purchase Class A common stock and Employee Stock Purchase Plan (“ESPP”) purchase rights.

As of June 30, 2018, awards outstanding under the 2009 Plan consisted of stock options, and awards outstanding under the 2014 Plan consisted of stock options and restricted stock units.

In June 2018, stockholders approved an amendment to the 2014 Plan that increased the number of shares available for grant by 3,000,000. As of June 30, 2018, 3,273,124 shares of Class A common stock were available for grant under the 2014 Plan.

Our ESPP became effective on June 13, 2017. Under the ESPP, eligible employees are granted options to purchase shares of Class A common stock at the lower of 85% of the fair market value of the stock at the time of grant or 85% of the fair market value at the time of exercise. Options to purchase

shares are granted twice yearly on or about January 15 and July 15 and are exercisable on or about the succeeding July 14 and January 14, respectively, of each year. As of June 30, 2018, 4,920,003 shares of Class A common stock were available for issuance under the ESPP. No participant may purchase more than $12,500 worth of common stock in a six-month offering period.

Stock-Based Compensation Expense

Stock-based compensation expense was recorded in the following cost and expense categories consistent with the respective employee or service provider’s related cash compensation (in thousands):


	Three months ended June 30,						Six months ended June 30,
	2018		2017		2018		2017
Cost of revenue
Subscription and support	$	228	$	178	$	399	$	318
Professional services	146		100		296		200
Operating expenses
Research and development	1,495		472		2,516		965
Sales and marketing	1,440		694		2,553		1,353
General and administrative	7,156		2,953		10,606		5,700
Total	$	10,465	$	4,397	$	16,370	$	8,536

The fair value of each option grant and each share issued under the ESPP is estimated on the date of grant using the Black-Scholes option-pricing model. For stock options, expected volatility is based on the historical volatility of our common stock and historical volatilities for publicly traded stock of comparable companies over the estimated expected life of the options. For the ESPP purchase rights, expected volatility is based on the historical volatility of our common stock. The expected term represents the period of time the options and the ESPP purchase rights are expected to be outstanding. For stock options, the expected term is based on the “simplified method” as defined by SEC Staff Accounting Bulletin No. 110 (Topic 14.D.2). We use the “simplified method” due to the lack of sufficient historical exercise data to provide a reasonable basis upon which to otherwise estimate the expected life of the options. The expected term for the ESPP purchase rights approximates the offering period. The risk-free interest rate is based on yields on U.S. Treasury STRIPS (Separate Trading of Registered Interest and Principal of Securities) with a maturity similar to the estimated expected term of the options and ESPP purchase rights.

The fair value of our stock options and ESPP purchase rights was estimated assuming no expected dividends and the following weighted-average assumptions:


	Three months ended June 30,			Six months ended June 30,
	2018	2017	2018	2017
Stock Options
Expected term (in years)	—	6.1	—	6.0 - 6.1
Risk-free interest rate	—%	1.9% - 2.0%	—%	1.9% - 2.1%
Expected volatility	—%	39.3% - 39.6%	—%	39.3% - 43.8%

ESPP
Expected term (in years)	—	—	0.5	—
Risk-free interest rate	—%	—%	1.8%	—%
Expected volatility	—%	—%	22.2%	—%

Stock Options

The following table summarizes the option activity under the Plans for the six months ended June 30, 2018:


	Options	Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
					(in thousands)
Outstanding at December 31, 2017	8,145,777	$	13.33	7.0	$	65,913
Granted	—	—
Forfeited	(105,977)	16.95
Exercised	(624,388)	10.24
Outstanding at June 30, 2018	7,415,412	$	13.54	6.6	$	80,539

Exercisable at June 30, 2018	5,237,069	$	12.36	5.8	$	63,072

Options to purchase Class A common stock generally vest over a three- or four-year period and are generally granted for a term of ten years. The total intrinsic value of options exercised during the six months ended June 30, 2018 and 2017 was $8.7 million and $4.2 million, respectively.

The weighted-average grant-date fair value of options granted during the six months ended June 30, 2017 was $6.05. No options were granted during the six months ended June 30, 2018. The total fair value of options vested during the six months ended June 30, 2018 and 2017 was approximately $8.4 million and $5.2 million, respectively. Total unrecognized compensation expense of $13.0 million related to options will be recognized over a weighted-average period of 2.3 years.

Restricted Stock Awards

We have granted restricted stock awards to our executive officers that vest in three equal annual installments from the date of grant. The recipient of an award of restricted stock under the Plan may vote and receive dividends on the shares of restricted stock covered by the award. The fair value for restricted stock awards is calculated based on the stock price on the date of grant. The total fair value of restricted stock awards vested during the six months ended June 30, 2018 and 2017 was approximately $2.2 million and $2.4 million, respectively.

The following table summarizes the restricted stock award activity under the Plan for the six months ended June 30, 2018:


	Number of Shares	Weighted- Average Grant Date Fair Value

Unvested at December 31, 2017	163,332	$	13.40
Granted	—	—
Forfeited	—	—
Vested	(163,332)	13.40
Unvested at June 30, 2018	—	$	—

Compensation expense associated with unvested restricted stock awards is recognized on a straight-line basis over the vesting period. At June 30, 2018, there was no unrecognized compensation expense related to restricted stock awards.

Restricted Stock Units

Restricted stock units granted to employees generally vest over a three- or four-year period in equal, annual installments or with three-year cliff vesting. Restricted stock units granted to non-employee members of our Board of Directors generally have one-year cliff vesting from the date of grant. The recipient of a restricted stock unit award under the Plan will have no rights as a stockholder until share certificates are issued by us, but, at the discretion of our Compensation Committee, has the right to receive a dividend equivalent payment in the form of additional restricted stock units. Additionally, until the shares are issued, they have no voting rights and may not be bought or sold. The fair value for restricted stock units is calculated based on the stock price on the date of grant. The total fair value of restricted stock units vested during the six months ended June 30, 2018 and 2017 was approximately $7.2 million and $2.5 million, respectively.

The following table summarizes the restricted stock unit activity under the Plan for the six months ended June 30, 2018:


	Number of Shares	Weighted- Average Grant Date Fair Value

Unvested at December 31, 2017	574,072	$	14.51
Granted	1,933,643	22.96
Forfeited	(22,004)	22.23
Vested⁽¹⁾	(439,436)	16.46
Unvested at June 30, 2018	2,046,275	$	22.00

(1) As of June 30, 2018, recipients of 554,621 shares had elected to defer settlement of the vested restricted stock units in accordance with our Nonqualified Deferred Compensation Plan.

Compensation expense associated with unvested restricted stock units is recognized on a straight-line basis over the vesting period. At June 30, 2018, there was approximately $39.4 million of total unrecognized compensation expense related to restricted stock units, which is expected to be recognized over a weighted-average period of 2.6 years.

Employee Stock Purchase Plan

During the six months ended June 30, 2018, 79,997 shares of common stock were purchased under the ESPP at a weighted-average price of $17.13 per share, resulting in cash proceeds of $1.4 million.

Compensation expense associated with ESPP purchase rights is recognized on a straight-line basis over the vesting period. At June 30, 2018, there was approximately $35,000 of total unrecognized compensation expense related to the ESPP, which is expected to be recognized over a weighted-average period of 0.04 years.

Revenue Recognition

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Revenue Recognition

Disaggregation of Revenue

The following table presents our revenues disaggregated by industry (in thousands):


	Three months ended June 30, 2018		Six months ended June 30, 2018
Information technology	$	7,584	$	14,854
Consumer discretionary	6,882		13,775
Industrials	6,511		13,258
Diversified financials	6,053		12,343
Banks	5,787		11,836
Healthcare	5,104		10,454
Energy	4,709		9,604
Other	16,500		32,912
Total revenues	$	59,130	$	119,036

The following table presents our revenues disaggregated by type of good or service (in thousands):


	Three months ended June 30, 2018		Six months ended June 30, 2018
Subscription and support	$	48,837	$	95,307
XBRL professional services	6,916		16,768
Other services	3,377		6,961
Total revenues	$	59,130	$	119,036

Deferred Revenue

During the three months ended June 30, 2018, we recognized $43.3 million of revenue that was included in the deferred revenue balance at the beginning of the period. During the six months ended June 30, 2018, we recognized $77.0 million of revenue that was included in the deferred revenue balance at the beginning of the period.

Transaction Price Allocated to the Remaining Performance Obligations

As of June 30, 2018, revenue of approximately $140.3 million is expected to be recognized from remaining performance obligations for subscription contracts. We expect to recognize approximately $118.5 million of these remaining performance obligations over the next 12 months, with the balance recognized thereafter.

Net Loss Per Share

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Net Loss Per Share

Basic net loss per share is computed by dividing the net loss by the weighted-average number of shares of common stock outstanding during the period. Diluted net loss per share is computed by giving effect to all potential shares of common stock, including our outstanding stock options, stock related to unvested restricted stock awards, and common stock issuable pursuant to the ESPP to the extent dilutive.

The net loss per share is allocated based on the participation rights of the Class A and Class B common shares as if the loss for the year has been distributed. As the liquidation and dividend rights are identical, the net loss is allocated on a proportionate basis.

We consider unvested restricted stock awards granted under the 2014 Equity Incentive Plan to be participating securities because holders of such shares have non-forfeitable dividend rights in the event of our declaration of a dividend for common shares. In future periods to the extent we are profitable, we will subtract earnings allocated to these participating securities from net income to determine net income attributable to common stockholders.

A reconciliation of the denominator used in the calculation of basic and diluted loss per share is as follows (in thousands, except share and per share data):


	Three months ended
	June 30, 2018						June 30, 2017
	Class A		Class B		Class A		Class B
Numerator
Net loss	$	(16,755)	$	(5,013)	$	(7,527)	$	(2,669)

Denominator
Weighted-average common shares outstanding - basic and diluted	33,278,982		9,955,673		30,585,012		10,844,679
Basic and diluted net loss per share	$	(0.50)	$	(0.50)	$	(0.25)	$	(0.25)


	Six months ended
	June 30, 2018						June 30, 2017
	Class A		Class B		Class A		Class B
Numerator
Net loss	$	(24,040)	$	(7,346)	$	(11,814)	$	(4,218)

Denominator
Weighted-average common shares outstanding - basic and diluted	32,972,720		10,075,390		30,413,156		10,856,882
Basic and diluted net loss per share	$	(0.73)	$	(0.73)	$	(0.39)	$	(0.39)

The anti-dilutive securities excluded from the weighted-average shares used to calculate the diluted net loss per common share were as follows:


	As of
	June 30, 2018	June 30, 2017
Shares subject to outstanding common stock options	7,415,412	8,139,151
Shares subject to unvested restricted stock awards	—	176,665
Shares issuable pursuant to the ESPP	102,756	—

Organization and Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation and Principles of Consolidation

Use of Estimates

Revenue Recognition

We determine revenue recognition through the following steps:

• Identification of the contract, or contracts, with a customer

• Identification of the performance obligations in the contract

• Determination of the transaction price

• Allocation of the transaction price to the performance obligations in the contract

• Recognition of revenue when, or as, we satisfy a performance obligation

We report revenue net of sales and other taxes collected from customers to be remitted to government authorities.

Subscription and Support Revenue

Professional Services Revenue and Customer Options

Contracts with Multiple Performance Obligations

Deferred Revenue and Customer Deposits

Deferred Revenue

Customer Deposits

Deferred Commissions

Income Taxes

On December 22, 2017, the U.S. federal government enacted legislation commonly referred to as the “Tax Cuts and Jobs Act” (the “TCJA”). The TCJA makes widespread changes to the Internal Revenue Code, including, among other items, the introduction of a new international “Global Intangible Low-Taxed Income” (“GILTI”) regime effective January 1, 2018. Companies may adopt one of two views in regards to establishing deferred taxes in accordance with the new (“GILTI”) regime under ASC 740. Companies may account for the effects of GILTI either (1) in the period the entity becomes subject to GILTI, or (2) establish deferred taxes (similar to the guidance that currently exists with respect to basis differences that will reverse under current Subpart F rules) for basis differences that upon reversal will be subject to GILTI. We have elected to account for the effects of GILTI in the period incurred and expect to incur an adjustment related to GILTI for the year ended December 31, 2018. This adjustment is offset by a corresponding reduction to the valuation allowance and as a result has zero impact on our effective tax rate. We will continue to refine our calculations as additional guidance is released during the measurement period as permitted by SEC Staff Accounting Bulletin 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act.

Recently Adopted Accounting Pronouncements and New Accounting Pronouncements Not Yet Adopted

The cumulative effect of the changes made to our consolidated January 1, 2018 balance sheet for the adoption of ASU 2014-09 were as follows (in thousands):


	As of December 31, 2017		Adjustments Due to ASU 2014-09		As of January 1, 2018
Assets
Accounts receivable, net	$	28,800	$	16,900	$	45,700
Deferred commissions	2,376		650		3,026
Deferred commissions, non-current	—		4,655		4,655

Liabilities
Accrued expenses and other current liabilities	20,212		6,956		27,168
Deferred revenue	104,684		6,625		111,309
Deferred revenue, non-current	22,709		243		22,952

Equity
Accumulated deficit	$	(265,337)	$	8,381	$	(256,956)


	As of June 30, 2018
	As Reported		Balances Without Adoption of ASC 606		Effect of Change
Assets
Accounts receivable, net	$	39,088	$	27,029	$	12,059
Deferred commissions	4,844		2,686		2,158
Deferred commissions, non-current	6,462		—		6,462

Liabilities
Accrued expenses and other current liabilities	30,979		24,256		6,723
Deferred revenue	118,490		116,949		1,541
Deferred revenue, non-current	21,835		19,877		1,958

Equity
Accumulated deficit	$	(288,342)	$	(298,799)	$	10,457


	Three months ended June 30, 2018										Six months ended June 30, 2018
	As Reported		Balances Without Adoption of ASC 606		Effect of Change		As Reported		Balances Without Adoption of ASC 606		Effect of Change
Revenues
Subscription and support	$	48,837	$	48,469	$	368	$	95,307	$	94,706	$	601
Professional services	10,293		10,418		(125)		23,729		25,548		(1,819)

Operating expenses
Sales and marketing	22,252		23,930		(1,678)		43,258		46,552		(3,294)

Net loss	$	(21,768)	$	(23,689)	$	1,921	$	(31,386)	$	(33,462)	$	2,076

Net loss per common share
Basic and diluted	$	(0.50)	$	(0.55)	$	0.05	$	(0.73)	$	(0.78)	$	0.05

The adoption of ASC 606 had no impact on our total cash flows from operations.

New Accounting Pronouncements Not Yet Adopted

Fair Value of Financial Instruments

Cash equivalents primarily consist of AAA-rated money market funds with overnight liquidity and no stated maturities. We classified cash equivalents as Level 1 due to the short-term nature of these instruments and measured the fair value based on quoted prices in active markets for identical assets. When available, our marketable securities are valued using quoted prices for identical instruments in active markets. If we are unable to value our marketable securities using quoted prices for identical instruments in active markets, we value our investments using broker reports that utilize quoted market prices for comparable instruments. We validate, on a sample basis, the derived prices provided by the brokers by comparing their assessment of the fair values of our investments against the fair values of the portfolio balances of another third-party professional pricing service.

Stock-based Compensation

Organization and Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

The cumulative effect of the changes made to our consolidated January 1, 2018 balance sheet for the adoption of ASU 2014-09 were as follows (in thousands):


	As of December 31, 2017		Adjustments Due to ASU 2014-09		As of January 1, 2018
Assets
Accounts receivable, net	$	28,800	$	16,900	$	45,700
Deferred commissions	2,376		650		3,026
Deferred commissions, non-current	—		4,655		4,655

Liabilities
Accrued expenses and other current liabilities	20,212		6,956		27,168
Deferred revenue	104,684		6,625		111,309
Deferred revenue, non-current	22,709		243		22,952

Equity
Accumulated deficit	$	(265,337)	$	8,381	$	(256,956)


	As of June 30, 2018
	As Reported		Balances Without Adoption of ASC 606		Effect of Change
Assets
Accounts receivable, net	$	39,088	$	27,029	$	12,059
Deferred commissions	4,844		2,686		2,158
Deferred commissions, non-current	6,462		—		6,462

Liabilities
Accrued expenses and other current liabilities	30,979		24,256		6,723
Deferred revenue	118,490		116,949		1,541
Deferred revenue, non-current	21,835		19,877		1,958

Equity
Accumulated deficit	$	(288,342)	$	(298,799)	$	10,457


	Three months ended June 30, 2018										Six months ended June 30, 2018
	As Reported		Balances Without Adoption of ASC 606		Effect of Change		As Reported		Balances Without Adoption of ASC 606		Effect of Change
Revenues
Subscription and support	$	48,837	$	48,469	$	368	$	95,307	$	94,706	$	601
Professional services	10,293		10,418		(125)		23,729		25,548		(1,819)

Operating expenses
Sales and marketing	22,252		23,930		(1,678)		43,258		46,552		(3,294)

Net loss	$	(21,768)	$	(23,689)	$	1,921	$	(31,386)	$	(33,462)	$	2,076

Net loss per common share
Basic and diluted	$	(0.50)	$	(0.55)	$	0.05	$	(0.73)	$	(0.78)	$	0.05

Supplemental Consolidated Balance Sheet and Statement of Operations Information (Tables)

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of (in thousands):


	June 30, 2018		December 31, 2017
Accrued vacation	$	6,931	$	6,087
Accrued commissions	3,331		3,297
Accrued bonuses	6,309		4,419
Estimated health insurance claims	1,120		1,090
ESPP employee contributions	1,853		1,419
Customer deposits	6,723		—
Accrued other liabilities	4,712		3,900
	$	30,979	$	20,212

Schedule of Other Income and (Expense), net

Other income, net for the three and six months ended June 30, 2018 and 2017 consisted of (in thousands):


	Three months ended June 30,						Six months ended June 30,
	2018		2017		2018		2017
Interest income	$	279	$	129	$	502	$	220
Income from training reimbursement program	100		198		208		736
Other	113		(151)		125		(168)
	$	492	$	176	$	835	$	788

Cash Equivalents and Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Schedule of Marketable Securities

At June 30, 2018, marketable securities consisted of the following (in thousands):


	Amortized Cost		Unrealized Gains		Unrealized Losses		Aggregate Fair Value
Money market funds	$	36,517	$	—	$	—	$	36,517
Commercial paper	9,508		—		—		9,508
U.S. treasury debt securities	1,993		—		(6)		1,987
U.S. corporate debt securities	11,812		—		(91)		11,721
	$	59,830	$	—	$	(97)	$	59,733
Included in cash and cash equivalents	$	36,517	$	—	$	—	$	36,517
Included in marketable securities	$	23,313	$	—	$	(97)	$	23,216

At December 31, 2017, marketable securities consisted of the following (in thousands):


	Amortized Cost		Unrealized Gains		Unrealized Losses		Aggregate Fair Value
Money market funds	$	49,452	$	—	$	—	$	49,452
U.S. treasury debt securities	3,083		—		(8)		3,075
U.S. corporate debt securities	13,350		—		(61)		13,289
	$	65,885	$	—	$	(69)	$	65,816
Included in cash and cash equivalents	$	49,452	$	—	$	—	$	49,452
Included in marketable securities	$	16,433	$	—	$	(69)	$	16,364

Schedule of Cash and Cash Equivalents

At June 30, 2018, marketable securities consisted of the following (in thousands):


	Amortized Cost		Unrealized Gains		Unrealized Losses		Aggregate Fair Value
Money market funds	$	36,517	$	—	$	—	$	36,517
Commercial paper	9,508		—		—		9,508
U.S. treasury debt securities	1,993		—		(6)		1,987
U.S. corporate debt securities	11,812		—		(91)		11,721
	$	59,830	$	—	$	(97)	$	59,733
Included in cash and cash equivalents	$	36,517	$	—	$	—	$	36,517
Included in marketable securities	$	23,313	$	—	$	(97)	$	23,216

At December 31, 2017, marketable securities consisted of the following (in thousands):


	Amortized Cost		Unrealized Gains		Unrealized Losses		Aggregate Fair Value
Money market funds	$	49,452	$	—	$	—	$	49,452
U.S. treasury debt securities	3,083		—		(8)		3,075
U.S. corporate debt securities	13,350		—		(61)		13,289
	$	65,885	$	—	$	(69)	$	65,816
Included in cash and cash equivalents	$	49,452	$	—	$	—	$	49,452
Included in marketable securities	$	16,433	$	—	$	(69)	$	16,364

Schedule of Available-for-sale Securities, Continuous Unrealized Loss Position


	As of June 30, 2018
	Less than 12 months						12 months or greater
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
U.S. treasury debt securities	$	1,987	$	(6)	$	—	$	—
U.S. corporate debt securities	11,721		(91)		—		—
Total	$	13,708	$	(97)	$	—	$	—

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Schedule of Assets Measured on Recurring Basis

The following table presents information about our assets that are measured at fair value on a recurring basis using the above input categories (in thousands):


	Fair Value Measurements as of June 30, 2018										Fair Value Measurements as of December 31, 2017
Description	Total		Level 1		Level 2		Total		Level 1		Level 2
Money market funds	$	36,517	$	36,517	$	—	$	49,452	$	49,452	$	—
Commercial paper	9,508		—		9,508		—		—		—
U.S. treasury debt securities	1,987		—		1,987		3,075		—		3,075
U.S. corporate debt securities	11,721		—		11,721		13,289		—		13,289
	$	59,733	$	36,517	$	23,216	$	65,816	$	49,452	$	16,364

Included in cash and cash equivalents	$	36,517					$	49,452
Included in marketable securities	$	23,216					$	16,364

Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Lease Payments Under Operating Leases

As of June 30, 2018, future estimated minimum lease payments under non-cancelable operating leases were as follows (in thousands):


	Operating Leases
Remainder of 2018	$	2,131
2019	3,517
2020	3,270
2021	3,211
2022	2,931
Thereafter	13,287
Total minimum lease payments	$	28,347

Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Stock-based Compensation Expense

Stock-based compensation expense was recorded in the following cost and expense categories consistent with the respective employee or service provider’s related cash compensation (in thousands):


	Three months ended June 30,						Six months ended June 30,
	2018		2017		2018		2017
Cost of revenue
Subscription and support	$	228	$	178	$	399	$	318
Professional services	146		100		296		200
Operating expenses
Research and development	1,495		472		2,516		965
Sales and marketing	1,440		694		2,553		1,353
General and administrative	7,156		2,953		10,606		5,700
Total	$	10,465	$	4,397	$	16,370	$	8,536

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The fair value of our stock options and ESPP purchase rights was estimated assuming no expected dividends and the following weighted-average assumptions:


	Three months ended June 30,			Six months ended June 30,
	2018	2017	2018	2017
Stock Options
Expected term (in years)	—	6.1	—	6.0 - 6.1
Risk-free interest rate	—%	1.9% - 2.0%	—%	1.9% - 2.1%
Expected volatility	—%	39.3% - 39.6%	—%	39.3% - 43.8%

ESPP
Expected term (in years)	—	—	0.5	—
Risk-free interest rate	—%	—%	1.8%	—%
Expected volatility	—%	—%	22.2%	—%

Schedule of Share-based Payment Award, ESPP, Valuation Assumptions

The fair value of our stock options and ESPP purchase rights was estimated assuming no expected dividends and the following weighted-average assumptions:


	Three months ended June 30,			Six months ended June 30,
	2018	2017	2018	2017
Stock Options
Expected term (in years)	—	6.1	—	6.0 - 6.1
Risk-free interest rate	—%	1.9% - 2.0%	—%	1.9% - 2.1%
Expected volatility	—%	39.3% - 39.6%	—%	39.3% - 43.8%

ESPP
Expected term (in years)	—	—	0.5	—
Risk-free interest rate	—%	—%	1.8%	—%
Expected volatility	—%	—%	22.2%	—%

Schedule of Stock-Option Activity

The following table summarizes the option activity under the Plans for the six months ended June 30, 2018:


	Options	Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
					(in thousands)
Outstanding at December 31, 2017	8,145,777	$	13.33	7.0	$	65,913
Granted	—	—
Forfeited	(105,977)	16.95
Exercised	(624,388)	10.24
Outstanding at June 30, 2018	7,415,412	$	13.54	6.6	$	80,539

Exercisable at June 30, 2018	5,237,069	$	12.36	5.8	$	63,072

Summary of Restricted Stock Awards

The following table summarizes the restricted stock award activity under the Plan for the six months ended June 30, 2018:


	Number of Shares	Weighted- Average Grant Date Fair Value

Unvested at December 31, 2017	163,332	$	13.40
Granted	—	—
Forfeited	—	—
Vested	(163,332)	13.40
Unvested at June 30, 2018	—	$	—

Summary of Restricted Stock Units

The following table summarizes the restricted stock unit activity under the Plan for the six months ended June 30, 2018:


	Number of Shares	Weighted- Average Grant Date Fair Value

Unvested at December 31, 2017	574,072	$	14.51
Granted	1,933,643	22.96
Forfeited	(22,004)	22.23
Vested⁽¹⁾	(439,436)	16.46
Unvested at June 30, 2018	2,046,275	$	22.00

(1) As of June 30, 2018, recipients of 554,621 shares had elected to defer settlement of the vested restricted stock units in accordance with our Nonqualified Deferred Compensation Plan.

Revenue Recognition (Tables)

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following table presents our revenues disaggregated by industry (in thousands):


	Three months ended June 30, 2018		Six months ended June 30, 2018
Information technology	$	7,584	$	14,854
Consumer discretionary	6,882		13,775
Industrials	6,511		13,258
Diversified financials	6,053		12,343
Banks	5,787		11,836
Healthcare	5,104		10,454
Energy	4,709		9,604
Other	16,500		32,912
Total revenues	$	59,130	$	119,036

The following table presents our revenues disaggregated by type of good or service (in thousands):


	Three months ended June 30, 2018		Six months ended June 30, 2018
Subscription and support	$	48,837	$	95,307
XBRL professional services	6,916		16,768
Other services	3,377		6,961
Total revenues	$	59,130	$	119,036

Net Loss Per Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

A reconciliation of the denominator used in the calculation of basic and diluted loss per share is as follows (in thousands, except share and per share data):


	Three months ended
	June 30, 2018						June 30, 2017
	Class A		Class B		Class A		Class B
Numerator
Net loss	$	(16,755)	$	(5,013)	$	(7,527)	$	(2,669)

Denominator
Weighted-average common shares outstanding - basic and diluted	33,278,982		9,955,673		30,585,012		10,844,679
Basic and diluted net loss per share	$	(0.50)	$	(0.50)	$	(0.25)	$	(0.25)


	Six months ended
	June 30, 2018						June 30, 2017
	Class A		Class B		Class A		Class B
Numerator
Net loss	$	(24,040)	$	(7,346)	$	(11,814)	$	(4,218)

Denominator
Weighted-average common shares outstanding - basic and diluted	32,972,720		10,075,390		30,413,156		10,856,882
Basic and diluted net loss per share	$	(0.73)	$	(0.73)	$	(0.39)	$	(0.39)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The anti-dilutive securities excluded from the weighted-average shares used to calculate the diluted net loss per common share were as follows:


	As of
	June 30, 2018	June 30, 2017
Shares subject to outstanding common stock options	7,415,412	8,139,151
Shares subject to unvested restricted stock awards	—	176,665
Shares issuable pursuant to the ESPP	102,756	—

Organization and Significant Accounting Policies - Accounting Policies (Details)	6 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Revenue recognition, customer contract period, minimum	3 months
Revenue recognition, customer contract period, maximum	36 months
Sales commissions amortization period	3 years
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Capitalized cost, amortization period	12 months
Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Capitalized cost, amortization period	3 years

Organization and Significant Accounting Policies - Adoption of New Accounting Standards (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Assets
Accounts receivable, net	$ 39,088		$ 39,088		$ 45,700	$ 28,800
Deferred commissions	4,844		4,844		3,026	2,376
Deferred commissions, non-current	6,462		6,462		4,655	0
Liabilities
Accrued expenses and other current liabilities	30,979		30,979		27,168	20,212
Deferred revenue	118,490		118,490		111,309	104,684
Deferred revenue, non-current	21,835		21,835		22,952	22,709
Accumulated deficit	(288,342)		(288,342)		(256,956)	(265,337)
Revenue
Total revenues	59,130	$ 49,391	119,036	$ 101,295
Operating expenses
Sales and marketing	22,252	19,787	43,258	38,500
Net loss	$ (21,768)	$ (10,196)	$ (31,386)	$ (16,032)
Net loss per common share:
Basic and diluted (in dollars per share)	$ (0.50)	$ (0.25)	$ (0.73)	$ (0.39)
Balances Without Adoption of ASC 606
Assets
Accounts receivable, net	$ 27,029		$ 27,029			28,800
Deferred commissions	2,686		2,686			2,376
Deferred commissions, non-current	0		0			0
Liabilities
Accrued expenses and other current liabilities	24,256		24,256			20,212
Deferred revenue	116,949		116,949			104,684
Deferred revenue, non-current	19,877		19,877			22,709
Accumulated deficit	(298,799)		(298,799)			$ (265,337)
Operating expenses
Sales and marketing	23,930		46,552
Net loss	$ (23,689)		$ (33,462)
Net loss per common share:
Basic and diluted (in dollars per share)	$ (0.55)		$ (0.78)
Accounting Standards Update 2014-09 \| Effect of Change
Assets
Accounts receivable, net	$ 12,059		$ 12,059		16,900
Deferred commissions	2,158		2,158		650
Deferred commissions, non-current	6,462		6,462		4,655
Liabilities
Accrued expenses and other current liabilities	6,723		6,723		6,956
Deferred revenue	1,541		1,541		6,625
Deferred revenue, non-current	1,958		1,958		243
Accumulated deficit	10,457		10,457		$ 8,381
Operating expenses
Sales and marketing	(1,678)		(3,294)
Net loss	$ 1,921		$ 2,076
Net loss per common share:
Basic and diluted (in dollars per share)	$ 0.05		$ 0.05
Subscription and support
Revenue
Total revenues	$ 48,837	$ 40,980	$ 95,307	$ 80,520
Subscription and support \| Balances Without Adoption of ASC 606
Revenue
Total revenues	48,469		94,706
Subscription and support \| Accounting Standards Update 2014-09 \| Effect of Change
Revenue
Total revenues	368		601
Professional services
Revenue
Total revenues	10,293	$ 8,411	23,729	$ 20,775
Professional services \| Balances Without Adoption of ASC 606
Revenue
Total revenues	10,418		25,548
Professional services \| Accounting Standards Update 2014-09 \| Effect of Change
Revenue
Total revenues	$ (125)		$ (1,819)

Supplemental Consolidated Balance Sheet and Statement of Operations Information - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Accrued Liabilities and Other Liabilities [Abstract]
Accrued vacation	$ 6,931		$ 6,087
Accrued commissions	3,331		3,297
Accrued bonuses	6,309		4,419
Estimated health insurance claims	1,120		1,090
ESPP employee contributions	1,853		1,419
Customer deposits	6,723		0
Accrued other liabilities	4,712		3,900
Accrued expenses and other current liabilities	$ 30,979	$ 27,168	$ 20,212

Supplemental Consolidated Balance Sheet and Statement of Operations Information - Other Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Nonoperating Income (Expense) [Abstract]
Interest income	$ 279	$ 129	$ 502	$ 220
Income from training reimbursement program	100	198	208	736
Other	113	(151)	125	(168)
Nonoperating income (expense)	$ 492	$ 176	$ 835	$ 788

Cash Equivalents and Marketable Securities - Schedule of Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 57,495	$ 65,256	$ 60,333	$ 59,986	$ 52,204	$ 51,281
Schedule of Available-for-sale Securities [Line Items]
Unrealized Gains	0		0
Unrealized Losses	(97)		(69)
Cash and cash equivalents and available-for-sale securities, amortized cost	59,830		65,885
Cash and cash equivalents and available-for-sale securities	59,733		65,816
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,508
Unrealized Gains	0
Unrealized Losses	0
Aggregate Fair Value	9,508
U.S. treasury debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,993		3,083
Unrealized Gains	0		0
Unrealized Losses	(6)		(8)
Aggregate Fair Value	1,987		3,075
U.S. corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,812		13,350
Unrealized Gains	0		0
Unrealized Losses	(91)		(61)
Aggregate Fair Value	11,721		13,289
Money market funds
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	36,517		49,452
Cash and cash equivalents, aggregate fair value	36,517		49,452
Cash and cash equivalents \| Money market funds
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	36,517		49,452
Cash and cash equivalents, aggregate fair value	36,517		49,452
Marketable securities \| U.S. corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	23,313		16,433
Unrealized Gains	0		0
Unrealized Losses	(97)		(69)
Aggregate Fair Value	$ 23,216		$ 16,364

Cash Equivalents and Marketable Securities - Continuous Unrealized Loss Position (Details) $ in Thousands	Jun. 30, 2018 USD ($)
Fair Value
Less than 12 months	$ 13,708
12 months or greater	0
Unrealized Loss
Less than 12 months	(97)
12 months or greater	0
U.S. treasury debt securities
Fair Value
Less than 12 months	1,987
12 months or greater	0
Unrealized Loss
Less than 12 months	(6)
12 months or greater	0
U.S. corporate debt securities
Fair Value
Less than 12 months	11,721
12 months or greater	0
Unrealized Loss
Less than 12 months	(91)
12 months or greater	$ 0

Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities - domestic debt securities	$ 9,508
U.S. treasury debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities - domestic debt securities	1,987	$ 3,075
U.S. corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities - domestic debt securities	11,721	13,289
U.S. corporate debt securities \| Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities - domestic debt securities	23,216	16,364
Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	36,517	49,452
Money market funds \| Cash and cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	36,517	49,452
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	59,733	65,816
Recurring \| Cash and cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	36,517	49,452
Recurring \| Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities - domestic debt securities	23,216	16,364
Recurring \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities - domestic debt securities	9,508	0
Recurring \| U.S. treasury debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities - domestic debt securities	1,987	3,075
Recurring \| U.S. corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities - domestic debt securities	11,721	13,289
Recurring \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	36,517	49,452
Recurring \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	36,517	49,452
Recurring \| Level 1 \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities - domestic debt securities	0	0
Recurring \| Level 1 \| U.S. treasury debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities - domestic debt securities	0	0
Recurring \| Level 1 \| U.S. corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities - domestic debt securities	0	0
Recurring \| Level 1 \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	36,517	49,452
Recurring \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	23,216	16,364
Recurring \| Level 2 \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities - domestic debt securities	9,508	0
Recurring \| Level 2 \| U.S. treasury debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities - domestic debt securities	1,987	3,075
Recurring \| Level 2 \| U.S. corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities - domestic debt securities	11,721	13,289
Recurring \| Level 2 \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 0	$ 0

Deferred Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Deferred Costs (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue from Contract with Customer [Abstract]
Deferred costs	$ 11.3		$ 11.3
Amortization expense for deferred costs	2.4		4.4
Impairment loss	$ 0.0	$ 0.0	$ 0.0	$ 0.0

Commitments and Contingencies - Minimum Lease Payments Under Operating Lease (Details) $ in Thousands	Jun. 30, 2018 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Remainder of 2018	$ 2,131
2019	3,517
2020	3,270
2021	3,211
2022	2,931
Thereafter	13,287
Total minimum lease payments	$ 28,347

Stock-Based Compensation - Narrative (Details) - USD ($)		1 Months Ended
	Jun. 13, 2017	Jun. 30, 2018
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock purchase offering period	6 months
Employee Stock Purchase Plan \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant		4,920,003
Purchase price of common stock, percentage of fair market value	85.00%
Maximum stock purchase value per employee	$ 12,500
2014 Equity Incentive Plan \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in shares available for grant		3,000,000
Number of shares available for grant		3,273,124

Stock-Based Compensation - Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	$ 10,465	$ 4,397	$ 16,370	$ 8,536
Research and development
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	1,495	472	2,516	965
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	1,440	694	2,553	1,353
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	7,156	2,953	10,606	5,700
Subscription and support \| Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	228	178	399	318
Professional services \| Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	$ 146	$ 100	$ 296	$ 200

Stock-Based Compensation - Assumptions (Details)	3 Months Ended		6 Months Ended
Stock-Based Compensation - Assumptions (Details)	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Employee stock options
Weighted-Average Assumptions
Expected term (in years)	0 days	6 years 1 month 6 days	0 days
Risk-free interest rate, min (as a percent)		1.90%		1.90%
Risk-free interest rate, max (as a percent)		2.00%		2.10%
Risk-free interest rate (as percent)	0.00%		0.00%
Expected volatility, min (as percent)		39.30%		39.30%
Expected volatility, max (as percent)		39.60%		43.80%
Expected volatility (as percent)	0.00%		0.00%
Employee stock options \| Minimum
Weighted-Average Assumptions
Expected term (in years)				6 years
Employee stock options \| Maximum
Weighted-Average Assumptions
Expected term (in years)				6 years 1 month 6 days
Employee Stock Purchase Plan
Weighted-Average Assumptions
Expected term (in years)	0 days	0 days	6 months	0 days
Risk-free interest rate (as percent)	0.00%	0.00%	1.80%	0.00%
Expected volatility (as percent)	0.00%	0.00%	22.20%	0.00%

Stock-Based Compensation - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Options (in shares):
Outstanding beginning of the period (in shares)	8,145,777
Granted (in shares)	0
Forfeited (in shares)	(105,977)
Exercised (in shares)	(624,388)
Outstanding end of the period (in shares)	7,415,412		8,145,777
Exercisable at end of the period (in shares)	5,237,069
Weighted-Average Exercise Price (in dollars per share):
Outstanding beginning of the period (in dollars per share)	$ 13.33
Granted (in dollars per share)	0
Forfeited (in dollars per share)	16.95
Exercised (in dollars per share)	10.24
Outstanding end of the period (in dollars per share)	13.54		$ 13.33
Exercisable at the end of the period (in dollars per share)	$ 12.36
Outstanding, weighted-average remaining contractual term (years)	6 years 7 months 6 days		7 years
Exercisable, weighted-average remaining contractual term (years)	5 years 9 months 18 days
Outstanding, aggregate intrinsic value	$ 80,539		$ 65,913
Exercisable, aggregate intrinsic value	63,072
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options exercised intrinsic value	8,700	$ 4,200
Options grants in period, weighted average grant date fair value (in dollars per share)		$ 6.05
Options vested in period fair value	8,400	$ 5,200
Options unrecognized compensation expense	$ 13,000
Employee stock options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options unrecognized compensation expense, period for recognition (years)	2 years 3 months 18 days
Class A Common Stock \| Employee stock options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Expiration period (years)	10 years
Minimum \| Class A Common Stock \| Employee stock options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Award vesting period (years)	3 years
Maximum \| Class A Common Stock \| Employee stock options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Award vesting period (years)	4 years

Stock-Based Compensation - Restricted Stock Awards (Details) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Number of Shares (in shares)
Unvested at beginning of period (in shares)	163,332
Granted (in shares)	0
Forfeited (in shares)	0
Vested (in shares)	(163,332)
Unvested at end of period (in shares)	0
Weighted- Average Grant Date Fair Value (in dollars per share)
Unvested at beginning of period (in dollars per share)	$ 13.40
Granted (in dollars per share)	0
Forfeited (in dollars per share)	0
Vested (in dollars per share)	13.40
Unvested at end of period (in dollars per share)	$ 0
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested in period, fair value	$ 2,200,000	$ 2,400,000
Weighted- Average Grant Date Fair Value (in dollars per share)
Unrecognized compensation expense	$ 0
Restricted stock awards \| Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)	3 years

Stock-Based Compensation - Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Number of Shares (in shares)
Unvested at beginning of period (in shares)	163,332
Granted (in shares)	0
Forfeited (in shares)	0
Vested (in shares)	(163,332)
Unvested at end of period (in shares)	0
Weighted- Average Grant Date Fair Value (in dollars per share)
Unvested at beginning of period (in dollars per share)	$ 13.40
Granted (in dollars per share)	0
Forfeited (in dollars per share)	0
Vested (in dollars per share)	13.40
Unvested at end of period (in dollars per share)	$ 0
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)	3 years
Vested in period, fair value	$ 7.2	$ 2.5
Number of Shares (in shares)
Unvested at beginning of period (in shares)	574,072
Granted (in shares)	1,933,643
Forfeited (in shares)	(22,004)
Vested (in shares)	(439,436)
Unvested at end of period (in shares)	2,046,275
Weighted- Average Grant Date Fair Value (in dollars per share)
Unvested at beginning of period (in dollars per share)	$ 14.51
Granted (in dollars per share)	22.96
Forfeited (in dollars per share)	22.23
Vested (in dollars per share)	16.46
Unvested at end of period (in dollars per share)	$ 22.00
Number of vested shares recipients elected to defer settlement (in shares)	554,621
Unrecognized compensation expense	$ 39.4
Unrecognized compensation expense, period for recognition (years)	2 years 7 months 6 days
Board of Directors \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)	1 year
Minimum \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)	3 years
Maximum \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)	4 years

Stock-Based Compensation - Employee Stock Purchase Plan (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from shares issued in connection with employee stock purchase plan	$ 0	$ 0	$ 1,370	$ 0
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 35		$ 35
Unrecognized compensation expense, period for recognition (years)			14 days
Class A Common Stock \| Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased during period			79,997
Weighted-average price of shares purchased (in dollars per share)			$ 17.13
Proceeds from shares issued in connection with employee stock purchase plan			$ 1,400

Revenue Recognition - Disaggregration of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Total revenues	$ 59,130	$ 49,391	$ 119,036	$ 101,295
Subscription and support
Disaggregation of Revenue [Line Items]
Total revenues	48,837	$ 40,980	95,307	$ 80,520
XBRL Professional Services
Disaggregation of Revenue [Line Items]
Total revenues	6,916		16,768
Other services
Disaggregation of Revenue [Line Items]
Total revenues	3,377		6,961
Information technology
Disaggregation of Revenue [Line Items]
Total revenues	7,584		14,854
Consumer discretionary
Disaggregation of Revenue [Line Items]
Total revenues	6,882		13,775
Industrials
Disaggregation of Revenue [Line Items]
Total revenues	6,511		13,258
Diversified financials
Disaggregation of Revenue [Line Items]
Total revenues	6,053		12,343
Banks
Disaggregation of Revenue [Line Items]
Total revenues	5,787		11,836
Healthcare
Disaggregation of Revenue [Line Items]
Total revenues	5,104		10,454
Energy
Disaggregation of Revenue [Line Items]
Total revenues	4,709		9,604
Other
Disaggregation of Revenue [Line Items]
Total revenues	$ 16,500		$ 32,912

Revenue Recognition - Deferred Revenue and Transaction Price Allocated to the Remaining Performance Obligations (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)
Revenue from Contract with Customer [Abstract]
Deferred revenue recognized	$ 43.3	$ 77.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected to be recognized	$ 118.5	$ 118.5
Expected period of recognition		12 months

Net Loss Per Share - Earnings Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator
Net loss	$ (21,768)	$ (10,196)	$ (31,386)	$ (16,032)
Denominator
Weighted-average common shares outstanding - basic and diluted (in shares)	43,234,655	41,429,691	43,048,110	41,270,038
Basic and diluted net loss per share (in dollars per share)	$ (0.50)	$ (0.25)	$ (0.73)	$ (0.39)
Class A Common Stock
Numerator
Net loss	$ (16,755)	$ (7,527)	$ (24,040)	$ (11,814)
Denominator
Weighted-average common shares outstanding - basic and diluted (in shares)	33,278,982	30,585,012	32,972,720	30,413,156
Basic and diluted net loss per share (in dollars per share)	$ (0.50)	$ (0.25)	$ (0.73)	$ (0.39)
Class B Common Stock
Numerator
Net loss	$ (5,013)	$ (2,669)	$ (7,346)	$ (4,218)
Denominator
Weighted-average common shares outstanding - basic and diluted (in shares)	9,955,673	10,844,679	10,075,390	10,856,882
Basic and diluted net loss per share (in dollars per share)	$ (0.50)	$ (0.25)	$ (0.73)	$ (0.39)

Net Loss Per Share - Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Shares subject to outstanding common stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	7,415,412	8,139,151
Shares subject to unvested restricted stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	0	176,665
Shares issuable pursuant to the ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	102,756	0