Workiva (WK) 10-Q 6 Nov 19 2019 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2019	Nov. 04, 2019
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Entity File Number	001-36773
Entity Registrant Name	WORKIVA INC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-2509828
Entity Address, Address Line One	2900 University Blvd
Entity Address, City or Town	Ames
Entity Address, State or Province	IA
Entity Address, Postal Zip Code	50010
City Area Code	888
Local Phone Number	275-3125
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Class A common stock, par value $.001
Trading Symbol	WK
Security Exchange Name	NYSE
Entity Central Index Key	0001445305
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2019
Amendment Flag	false
Class A Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		37,820,028
Class B Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		8,640,596

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 389,124	$ 77,584
Marketable securities	95,644	20,764
Accounts receivable, net of allowance for doubtful accounts of $890 and $956 at September 30, 2019 and December 31, 2018, respectively	43,590	65,107
Deferred commissions	12,740	8,178
Other receivables	1,651	1,181
Prepaid expenses	8,148	4,417
Total current assets	550,897	177,231
Property and equipment, net	40,292	41,468
Operating lease right-of-use assets	15,917
Deferred commissions, non-current	13,940	10,569
Intangible assets, net	1,795	1,266
Other assets	3,920	577
Total assets	626,761	231,111
Current liabilities
Accounts payable	4,895	5,461
Accrued expenses and other current liabilities	47,302	36,353
Deferred revenue	156,352	148,545
Current portion of financing obligations	1,295
Current portion of financing obligations		1,222
Total current liabilities	209,844	191,581
Convertible senior notes, net	278,422	0
Deferred revenue, non-current	31,467	25,171
Other long-term liabilities	1,387	6,891
Operating lease liabilities, non-current	19,273
Financing obligations, non-current	16,234
Financing obligations, non-current		17,208
Total liabilities	556,627	240,851
Stockholders’ equity (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	408,656	297,145
Accumulated deficit	(338,863)	(307,027)
Accumulated other comprehensive income	294	98
Total stockholders’ equity (deficit)	70,134	(9,740)
Total liabilities and stockholders’ equity (deficit)	626,761	231,111
Class A Common Stock
Stockholders’ equity (deficit)
Common stock	38	34
Class B Common Stock
Stockholders’ equity (deficit)
Common stock	$ 9	$ 10

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Allowance for doubtful accounts	$ 890	$ 956
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, share authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	37,780,966	34,498,391
Common stock, shares outstanding	37,780,966	34,498,391
Class B Common Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, share authorized	500,000,000	500,000,000
Common stock, shares issued	8,640,596	9,545,596
Common stock, shares outstanding	8,640,596	9,545,596

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue
Total revenue	$ 74,179	$ 60,873	$ 217,626	$ 179,909
Cost of revenue
Total cost of revenue	21,751	15,659	61,964	48,466
Gross profit	52,428	45,214	155,662	131,443
Operating expenses
Research and development	22,899	19,984	66,705	60,829
Sales and marketing	32,990	24,068	86,568	67,326
General and administrative	12,017	11,864	33,626	45,286
Total operating expenses	67,906	55,916	186,899	173,441
Loss from operations	(15,478)	(10,702)	(31,237)	(41,998)
Interest income	1,460	341	2,593	843
Interest expense	(1,959)	(448)	(2,832)	(1,347)
Other income (expense), net	24	(138)	(259)	195
Loss before provision for income taxes	(15,953)	(10,947)	(31,735)	(42,307)
Provision for income taxes	98	17	101	43
Net loss	$ (16,051)	$ (10,964)	$ (31,836)	$ (42,350)
Net loss per common share:
Basic and diluted (in dollars per share)	$ (0.34)	$ (0.25)	$ (0.69)	$ (0.98)
Weighted-average common shares outstanding - basic and diluted (in shares)	46,731,663	43,973,428	46,048,037	43,359,939
Subscription and support
Revenue
Total revenue	$ 63,022	$ 51,306	$ 179,617	$ 146,613
Cost of revenue
Total cost of revenue	10,924	8,139	30,935	25,578
Professional services
Revenue
Total revenue	11,157	9,567	38,009	33,296
Cost of revenue
Total cost of revenue	$ 10,827	$ 7,520	$ 31,029	$ 22,888

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (16,051)	$ (10,964)	$ (31,836)	$ (42,350)
Other comprehensive income, net of tax
Foreign currency translation adjustment, net of income tax expense of $11 and $5 for the three months ended September 30, 2019 and 2018, respectively, and net of income tax expense of $16 and $5 for the nine months ended September 30, 2019 and 2018, respectively	19	(10)	34	21
Unrealized gain (loss) on available-for-sale securities, net of income tax benefit (expense) of $(10) and $1 for the three months ended September 30, 2019 and 2018, respectively, and net of income tax benefit (expense) of $(51) and $1 for the nine months ended September 30, 2019 and 2018, respectively	43	22	162	(6)
Other comprehensive income, net of tax	62	12	196	15
Comprehensive loss	$ (15,989)	$ (10,952)	$ (31,640)	$ (42,335)

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustment, tax expense	$ 11	$ 5	$ 16	$ 5
Unrealized gain on available-for-sale securities, tax benefit (expense)	$ (10)	$ 1	$ (51)	$ 1

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Common Stock (Class A and B)	Additional Paid-in-Capital	Accumulated Other Comprehensive Income	Accumulated Deficit
Shares, Outstanding, Beginning at Dec. 31, 2017		42,369,000
Beginning of the period at Dec. 31, 2017	$ (16,934)	$ 42	$ 248,289	$ 72	$ (265,337)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	5,905		5,905
Issuance of common stock upon exercise of stock options (in shares)		296,000
Issuance of common stock upon exercise of stock options	3,076	$ 1	3,075
Issuance of common stock under employee stock purchase plan (in shares)		80,000
Issuance of common stock under employee stock purchase plan	1,370		1,370
Issuance of restricted stock units (in shares)		9,000
Tax withholding related to net share settlements of stock-based compensation awards (in shares)		(61,000)
Tax withholding related to net share settlements of stock-based compensation awards	(1,342)		(1,342)
Net loss	(9,618)				(9,618)
Other comprehensive income (loss)	(56)			(56)
End of period at Mar. 31, 2018	(9,218)	$ 43	257,297	16	(266,574)
Shares, Outstanding, Ending at Mar. 31, 2018		42,693,000
Shares, Outstanding, Beginning at Dec. 31, 2017		42,369,000
Beginning of the period at Dec. 31, 2017	(16,934)	$ 42	248,289	72	(265,337)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(42,350)
Other comprehensive income (loss)	15
End of period at Sep. 30, 2018	(12,287)	$ 44	286,888	87	(299,306)
Shares, Outstanding, Ending at Sep. 30, 2018		43,800,000
Shares, Outstanding, Beginning at Mar. 31, 2018		42,693,000
Beginning of the period at Mar. 31, 2018	(9,218)	$ 43	257,297	16	(266,574)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	10,465		10,465
Issuance of common stock upon exercise of stock options (in shares)		328,000
Issuance of common stock upon exercise of stock options	3,317	$ 0	3,317
Issuance of restricted stock units (in shares)		64,000
Tax withholding related to net share settlements of stock-based compensation awards (in shares)		(23,000)
Tax withholding related to net share settlements of stock-based compensation awards	(519)		(519)
Net loss	(21,768)				(21,768)
Other comprehensive income (loss)	59			59
End of period at Jun. 30, 2018	(17,664)	$ 43	270,560	75	(288,342)
Shares, Outstanding, Ending at Jun. 30, 2018		43,062,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	6,949		6,949
Issuance of common stock upon exercise of stock options (in shares)		635,000
Issuance of common stock upon exercise of stock options	7,534	$ 1	7,533
Issuance of common stock under employee stock purchase plan (in shares)		99,000
Issuance of common stock under employee stock purchase plan	1,846		1,846
Issuance of restricted stock units (in shares)		4,000
Net loss	(10,964)				(10,964)
Other comprehensive income (loss)	12			12
End of period at Sep. 30, 2018	(12,287)	$ 44	286,888	87	(299,306)
Shares, Outstanding, Ending at Sep. 30, 2018		43,800,000
Shares, Outstanding, Beginning at Dec. 31, 2018		44,044,000
Beginning of the period at Dec. 31, 2018	(9,740)	$ 44	297,145	98	(307,027)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	8,193		8,193
Issuance of common stock upon exercise of stock options (in shares)		961,000
Issuance of common stock upon exercise of stock options	11,055	$ 1	11,054
Issuance of common stock under employee stock purchase plan (in shares)		101,000
Issuance of common stock under employee stock purchase plan	2,149		2,149
Issuance of restricted stock units (in shares)		25,000
Tax withholding related to net share settlements of stock-based compensation awards (in shares)		(10,000)
Tax withholding related to net share settlements of stock-based compensation awards	(390)		(390)
Net loss	(7,463)				(7,463)
Other comprehensive income (loss)	52			52
End of period at Mar. 31, 2019	3,856	$ 45	318,151	150	(314,490)
Shares, Outstanding, Ending at Mar. 31, 2019		45,121,000
Shares, Outstanding, Beginning at Dec. 31, 2018		44,044,000
Beginning of the period at Dec. 31, 2018	$ (9,740)	$ 44	297,145	98	(307,027)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	1,817,243
Net loss	$ (31,836)
Other comprehensive income (loss)	196
End of period at Sep. 30, 2019	70,134	$ 47	408,656	294	(338,863)
Shares, Outstanding, Ending at Sep. 30, 2019		46,422,000
Shares, Outstanding, Beginning at Mar. 31, 2019		45,121,000
Beginning of the period at Mar. 31, 2019	3,856	$ 45	318,151	150	(314,490)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	8,513		8,513
Issuance of common stock upon exercise of stock options (in shares)		455,000
Issuance of common stock upon exercise of stock options	5,498	$ 1	5,497
Issuance of restricted stock units (in shares)		323,000
Net loss	(8,322)				(8,322)
Other comprehensive income (loss)	82			82
End of period at Jun. 30, 2019	9,627	$ 46	332,161	232	(322,812)
Shares, Outstanding, Ending at Jun. 30, 2019		45,899,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	9,223		9,223
Issuance of common stock upon exercise of stock options (in shares)		401,000
Issuance of common stock upon exercise of stock options	5,940	$ 1	5,939
Issuance of common stock under employee stock purchase plan (in shares)		87,000
Issuance of common stock under employee stock purchase plan	2,773		2,773
Issuance of restricted stock units (in shares)		35,000
Equity component of convertible senior notes, net	58,560		58,560
Net loss	(16,051)				(16,051)
Other comprehensive income (loss)	62			62
End of period at Sep. 30, 2019	$ 70,134	$ 47	$ 408,656	$ 294	$ (338,863)
Shares, Outstanding, Ending at Sep. 30, 2019		46,422,000

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities
Net loss	$ (16,051)	$ (10,964)	$ (31,836)	$ (42,350)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	1,058	1,133	2,932	2,881
Stock-based compensation expense	9,223	6,949	25,929	23,319
(Recovery of) provision for doubtful accounts	(104)	128	(58)	311
Amortization (accretion) of premiums and discounts on marketable securities, net	15	(66)	(89)	(63)
Amortization of debt discount and issuance costs	1,083	0	1,083	0
Deferred income tax	(21)	(4)	(67)	(4)
Changes in assets and liabilities:
Accounts receivable	3,579	(1,691)	21,530	4,615
Deferred commissions	(2,106)	(1,939)	(7,968)	(5,608)
Operating lease right-of-use asset	581		1,805
Other receivables	(417)	(591)	(470)	(416)
Prepaid expenses and other	(191)	2,501	(3,737)	712
Other assets	(943)	(389)	(2,349)	(557)
Accounts payable	516	616	160	1,999
Deferred revenue	3,830	8,630	14,112	15,032
Operating lease liability	(758)		(2,226)
Accrued expenses and other liabilities	5,403	3,269	9,828	6,948
Net cash provided by operating activities	4,697	7,582	28,579	6,819
Cash flows from investing activities
Purchase of property and equipment	(663)	(523)	(2,860)	(742)
Purchase of marketable securities	(54,749)	(6,441)	(95,466)	(17,724)
Sale of marketable securities	498	0	498	0
Maturities of marketable securities	1,500	4,600	20,390	9,000
Purchase of intangible assets	(51)	(46)	(712)	(174)
Other investments	(1,000)	0	(1,000)	0
Net cash used in investing activities	(54,465)	(2,410)	(79,150)	(9,640)
Cash flows from financing activities
Proceeds from option exercises	5,940	7,534	22,493	13,927
Taxes paid related to net share settlements of stock-based compensation awards	0	0	(390)	(1,861)
Proceeds from shares issued in connection with employee stock purchase plan	2,773	1,846	4,922	3,216
Proceeds from the issuance of convertible senior notes, net of issuance costs	335,899	0	335,899	0
Principal payments on financing obligations	(306)		(901)
Principal payments on capital lease obligations		(287)		(879)
Proceeds from government grants	0	0	0	22
Net cash provided by financing activities	344,306	9,093	362,023	14,425
Effect of foreign exchange rates on cash	(127)	83	88	(94)
Net increase in cash and cash equivalents	294,411	14,348	311,540	11,510
Cash and cash equivalents at beginning of period	94,713	57,495	77,584	60,333
Cash and cash equivalents at end of period	389,124	71,843	389,124	71,843
Supplemental cash flow disclosure
Cash paid for interest	408	436	1,294	1,304
Cash paid for income taxes, net of refunds	80	0	341	56
Supplemental disclosure of noncash investing and financing activities
Allowance for tenant improvements	0	1,153	0	1,280
Purchases of property and equipment, accrued but not paid	$ 0	$ 105	$ 0	$ 105

Organization and Significant Ac

Organization and Significant Accounting Policies	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Significant Accounting Policies	Organization and Significant Accounting Policies Organization Workiva Inc., a Delaware corporation, and its wholly-owned subsidiaries (the “Company” or “we” or “us”) is a leading provider of cloud-based solutions for connected reporting and compliance. Our platform, Wdesk, is used by thousands of public and private companies, government agencies and higher-education institutions. Wdesk offers controlled collaboration, data linking, data integrations, granular permissions, process management and a full audit trail. We sell to customers in the areas of: finance and accounting; risk and controls; regulatory reporting; financial close, management and performance reporting; and statutory and corporate tax reporting. Our operational headquarters are located in Ames, Iowa, with additional offices located in the United States, Europe, the Asia-Pacific region and Canada. We updated our accounting policies on the use of estimates, impairment of long-lived assets and leases as a result of our adopting Financial Accounting Standards Board (FASB) guidance issued in accounting standards codification (ASC) 842, Leases , under the Accounting Standards Update (ASU) 2016-02 (collectively the new lease 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, 2018, filed with the SEC on February 20, 2019, 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, 2018 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 nine months ended September 30, 2019 are not necessarily indicative of the results expected for the full year ending December 31, 2019. 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, 2018 filed with the SEC on February 20, 2019. 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. Additionally, certain prior period amounts have been reclassified for consistency with the current year presentation. The reclassification of the prior period amounts were not material to the previously reported consolidated financial statements. 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, discount rates used in the valuation of right-of-use assets and lease liabilities, the fair value of the liability and equity components of the convertible senior notes, 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. Impairment of Long-Lived Assets Long-lived assets, such as property, equipment, right-of-use assets and software and intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset group may not be recoverable. If circumstances require that a long-lived asset or asset group be tested for possible impairment, we first compare the undiscounted cash flows expected to be generated by that long-lived asset or asset group to its carrying amount. If the carrying amount of the long-lived asset or asset group is not recoverable on an undiscounted cash flow basis, an impairment is recognized to the extent that the carrying amount exceeds its fair value. Leases We determine if an arrangement is a lease at inception. Operating leases are included in operating lease right-of-use (“ROU”) assets, other current liabilities, and operating lease liabilities on our condensed consolidated balance sheets. We currently have no finance leases. ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at the commencement date. Our variable lease payments consist of non-lease services related to the lease. Variable lease payments are excluded from the ROU assets and lease liabilities and are recognized in the period in which the obligation for those payments is incurred. As our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments. The operating lease ROU asset also includes any lease payments made and excludes lease incentives incurred. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. We have lease agreements with lease and non-lease components. We have elected to account for these lease and non-lease components as a single lease component. We are also electing not to apply the recognition requirements to short-term leases of 12 months or less and instead will recognize lease payments as expense on a straight-line basis over the lease term. Recently Adopted Accounting Pronouncements In February 2016, the Financial Accounting Standards Board (“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 (with the exception of short-term leases). In July 2018, the FASB issued an update (ASU 2018-11) to the existing transition guidance that allows entities to recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. Effective January 1, 2019, we adopted ASC 842 using this new transition guidance. The comparative information has not been restated and continues to be reported under the accounting standard in effect for those periods. We have elected to use the package of practical expedients, which allows us to not (1) reassess whether any expired or existing contracts are considered or contain leases; (2) reassess the lease classification for any expired or existing leases; and (3) reassess the initial direct costs for any existing leases. We did not elect the hindsight practical expedient, which permits entities to use hindsight in determining the lease term and assessing impairment. Adoption of the new standard had a material impact on our condensed consolidated balance sheets. The most significant impacts related to the recognition of right-of-use assets and lease liabilities for operating leases. The adoption of ASC 842 had no impact on our condensed consolidated statements of operations or total cash flows from operations. The cumulative effect of the changes made to our consolidated January 1, 2019 balance sheet for the adoption of ASC 842 were as follows (in thousands): As of December 31, 2018 Adjustments due to ASC 842 adoption As of January 1, 2019 Assets Operating right-of-use asset $ — $ 15,694 $ 15,694 Liabilities Accrued expenses and other current liabilities 36,353 2,319 38,672 Other long-term liabilities 6,891 (6,007) 884 Operating lease liabilities, non-current — 19,382 19,382 In August 2018, the FASB issued ASU 2018-15, Intangibles - Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract, which clarifies the accounting for implementation costs in cloud computing arrangements. The update will become effective for interim and annual periods beginning after December 15, 2019 and may be adopted either retrospectively or prospectively. Early adoption is permitted. We adopted this standard prospectively effective April 1, 2019. The adoption of this new guidance did not have a material impact on our consolidated financial statements. New Accounting Pronouncements Not Yet Adopted In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which amends the current accounting guidance and requires the measurement of all expected losses based on historical experience, current conditions and reasonable and supportable forecasts. For trade receivables, loans, and other financial instruments, we will be required to use a forward-looking expected loss model that reflects probable losses rather than the incurred loss model for recognizing credit losses. The standard will become effective for interim and annual periods beginning after December 15, 2019, with early adoption permitted. Application of the amendments is through a cumulative-effect adjustment to retained earnings as of the effective date. We plan to adopt this standard on the effective date and are currently evaluating the impact of this new standard on our consolidated financial statements.

Supplemental Consolidated Balan

Supplemental Consolidated Balance Sheet Information	9 Months Ended
	Sep. 30, 2019
Payables and Accruals [Abstract]
Supplemental Consolidated Balance Sheet Information	Supplemental Consolidated Balance Sheet Information Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities consisted of the following (in thousands): As of September 30, 2019 As of December 31, 2018 Accrued vacation $ 8,095 $ 6,906 Accrued commissions 4,574 7,265 Accrued bonuses 11,348 5,643 Estimated health insurance claims 1,150 1,100 ESPP employee contributions 2,026 2,156 Customer deposits 10,814 7,395 Operating lease liabilities 2,827 — Accrued other liabilities 6,468 5,888 $ 47,302 $ 36,353

Cash Equivalents and Marketable

Cash Equivalents and Marketable Securities	9 Months Ended
	Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Cash Equivalents and Marketable Securities	Cash Equivalents and Marketable Securities At September 30, 2019, marketable securities consisted of the following (in thousands): Amortized Cost Unrealized Gains Unrealized Losses Aggregate Fair Value Money market funds $ 368,634 $ — $ — $ 368,634 U.S. treasury debt securities 10,284 2 (1) 10,285 U.S. corporate debt securities 85,216 148 (5) 85,359 $ 464,134 $ 150 $ (6) $ 464,278 Included in cash and cash equivalents $ 368,634 $ — $ — $ 368,634 Included in marketable securities $ 95,500 $ 150 $ (6) $ 95,644 At December 31, 2018, marketable securities consisted of the following (in thousands): Amortized Cost Unrealized Gains Unrealized Losses Aggregate Fair Value Money market funds $ 52,068 $ — $ — $ 52,068 Commercial paper 7,448 — — 7,448 U.S. treasury debt securities 2,494 — (1) 2,493 U.S. corporate debt securities 10,890 — (67) 10,823 $ 72,900 $ — $ (68) $ 72,832 Included in cash and cash equivalents $ 52,068 $ — $ — $ 52,068 Included in marketable securities $ 20,832 $ — $ (68) $ 20,764 The following table presents gross unrealized losses and fair values for those marketable securities that were in an unrealized loss position as of September 30, 2019, aggregated by investment category and the length of time that individual securities have been in a continuous loss position (in thousands): As of September 30, 2019 Less than 12 months 12 months or greater Fair Value Unrealized Loss Fair Value Unrealized Loss U.S. treasury debt securities $ 6,339 $ (1) $ — $ — U.S. corporate debt securities 7,691 (3) 3,000 (2) Total $ 14,030 $ (4) $ 3,000 $ (2) 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 September 30, 2019 to hold these investments until the cost basis is recovered.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	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 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. As of September 30, 2019, 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 September 30, 2019 Fair Value Measurements as of December 31, 2018 Description Total Level 1 Level 2 Total Level 1 Level 2 Money market funds $ 368,634 $ 368,634 $ — $ 52,068 $ 52,068 $ — Commercial paper — — — 7,448 — 7,448 U.S. treasury debt securities 10,285 — 10,285 2,493 — 2,493 U.S. corporate debt securities 85,359 — 85,359 10,823 — 10,823 $ 464,278 $ 368,634 $ 95,644 $ 72,832 $ 52,068 $ 20,764 Included in cash and cash equivalents $ 368,634 $ 52,068 Included in marketable securities $ 95,644 $ 20,764 Convertible Senior Notes As of September 30, 2019, the fair value of our convertible senior notes was $314.2 million. The fair value was determined based on the quoted price of the convertible senior notes in an over-the-counter market on the last trading day of the reporting period and has been classified as Level 2 in the fair value hierarchy. See Note 6 to the condensed consolidated financial statements for more information.

Leases

Leases	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Leases	Leases Operating Leases We lease certain office and residential space under non-cancelable operating leases with various lease terms through June 2043. Leases with an initial term of 12 months or less are not recorded on the balance sheet; we recognize lease expense for these leases on a straight-line basis over the lease term. Certain office leases include one or more options to renew, with renewal terms that can extend the lease term from 3 to 5 years. The exercise of lease renewal options is at our sole discretion and is generally excluded from the lease term at lease inception. Our leases generally require us to pay a proportionate share of real estate taxes, insurance, common area maintenance, and other operating costs in addition to a base or fixed rent. The components of lease expense were as follows (in thousands): Three months ended September 30, 2019 Nine months ended September 30, 2019 Operating lease cost $ 837 $ 2,600 Short-term lease cost 347 885 Variable lease cost 259 691 $ 1,443 $ 4,176 Supplemental cash flow information related to leases was as follows (in thousands): Three months ended September 30, 2019 Nine months ended September 30, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 1,031 $ 3,111 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ — $ 2,033 Other supplemental information related to leases was as follows: As of September 30, 2019 Weighted Average Remaining Lease Term (in years) Operating leases 7.9 Weighted Average Discount Rate Operating leases 5.7 % As of September 30, 2019, future estimated minimum lease payments under non-cancelable operating leases were as follows (in thousands): Operating Leases Remainder of 2019 $ 910 2020 4,153 2021 4,237 2022 3,872 2023 3,540 Thereafter 11,255 Total minimum lease payments 27,967 Less: Amount representing interest (5,867) Total $ 22,100 As of September 30, 2019, we did not have additional operating or financing leases that had not yet commenced.

Debt

Debt	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Debt	Debt Other Long-Term Debt In August 2014, we entered into a credit facility with Silicon Valley Bank, which provided us with a revolving line of credit. Under the agreement, we could borrow up to $15.0 million with interest accrued at the bank's prime lending rate. In August 2019,we terminated our credit facility with Silicon Valley Bank. No amounts were outstanding at the time of termination. Convertible Senior Notes In August 2019, we issued $345.0 million aggregate principal amount of 1.125% convertible senior notes due 2026 in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended, including the exercise in full by the initial purchasers of their option to purchase an additional $45.0 million principal amount (the “Notes”). The Notes were issued pursuant to an indenture and are senior, unsecured obligations of the Company. The Notes bear interest at a fixed rate of 1.125% per annum, payable semi-annually in arrears on February 15 and August 15 of each year, commencing on February 15, 2020. Proceeds from the issuance of the Notes totaled $335.9 million, net of initial purchaser discounts and issuance costs. The initial conversion rate is 12.4756 shares of our common stock per $1,000 principal amount of Notes, which is equivalent to an initial conversion price of approximately $80.16 per share, subject to adjustment upon the occurrence of specified events. The Notes will be convertible at the option of the holders at any time prior to the close of business on the business day immediately preceding May 15, 2026 only under the following circumstances: • during any calendar quarter commencing after the calendar quarter ending on September 30, 2019 (and only during such calendar quarter), if the last reported sale price of our Class A common stock, par value $0.001 per share (which we refer to in this offering memorandum as our “Class A common stock”), for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; • during the five consecutive business day period immediately following any ten consecutive trading day period (the “measurement period”) in which the trading price (as defined below) per $1,000 principal amount of Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of our Class A common stock and the conversion rate on each such trading day; • if we call any or all of the Notes for redemption, at any time prior to the close of business on the scheduled trading day immediately preceding the redemption date; or • upon the occurrence of certain specified corporate events as set forth in the indenture. On or after May 15, 2026 until the close of business on the business day immediately preceding the maturity date, holders may convert their Notes at any time, regardless of the foregoing circumstances. Upon conversion, we will pay or deliver, as the case may be, cash, shares of our Class A common stock or a combination of cash and shares of our Class A common stock, at our election, in the manner and subject to the terms and conditions provided in the indenture. It is our current intent to settle conversions through a combination settlement of cash and shares of our Class A common stock with a specified dollar amount per $1,000 principal amount of Notes of $1,000. If we undergo a fundamental change (as defined in the indenture), holders may require us to repurchase for cash all or any portion of their Notes at a fundamental change repurchase price equal to 100% of the principal amount of the Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date. In addition, following certain corporate events that occur prior to the maturity date or if we deliver a notice of redemption, we will increase, in certain circumstances, the conversion rate for a holder who elects to convert its Notes in connection with such corporate event or notice of redemption, as the case may be. During the three months ended September 30, 2019, the conditions allowing holders of the Notes to convert were not met. The Notes were therefore not convertible during the three months ended September 30, 2019 and are classified as long-term debt on our condensed consolidated balance sheets. We may not redeem the Notes prior to August 21, 2023. We may redeem for cash all or any portion of the Notes, at our option, on or after August 21, 2023 if the last reported sale price of our Class A common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive), including the trading day immediately preceding the date on which we provide notice of redemption, during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which we provide notice of redemption at a redemption price equal to 100% of the principal amount of the Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date. In accounting for the issuance of the Notes, we separated the Notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the fair value of similar debt instruments that do not have an associated convertible feature. The carrying amount of the equity component, representing the conversion option, was determined by deducting the fair value of the liability components from the par value of the Notes. The difference represents the debt discount that is amortized to interest expense at an effective interest rate of 4.3% over the term of the Notes. The carrying amount of the equity component was $60.1 million and is recorded in additional paid-in-capital. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. In accounting for the issuance costs related to the Notes, we allocated the total amount incurred to the liability and equity components of the Notes based on the proportion of the proceeds allocated to the debt and equity components. Issuance costs attributable to the liability component were $7.5 million. The issuance costs allocated to the liability component are amortized to interest expense under the effective interest rate method over the contractual term of the Notes. Issuance costs attributable to the equity component of the Notes were $1.6 million and are netted against the equity components representing the conversion option in additional paid-in capital. The net carrying amount of the liability and equity components of the Notes was as follows (in thousands): September 30, 2019 Liability component: Principal $ 345,000 Unamortized discount (59,184) Unamortized issuance costs (7,394) Net carrying amount $ 278,422 Equity component, net of purchase discounts and issuance costs $ 58,560 Interest expense related to the Notes is as follows (in thousands): Three and Nine Months Ended September 30, 2019 Contractual interest expense $ 468 Amortization of debt discount 963 Amortization of issuance costs 120 Total interest expense $ 1,551

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Other Purchase Commitments During 2019, we entered into certain non-cancelable agreements with third-party providers for our use of cloud services in the ordinary course of business. Under these agreements, we are committed to purchase $18,000 in fiscal year 2019, $1.2 million in fiscal year 2020, $2.3 million in fiscal year 2021, and $1.2 million in fiscal year 2022. 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. We evaluate the development of legal matters on a regular basis and accrue a liability when we believe a loss is probable and the amount can be reasonably estimated. 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

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2019
Share-based Payment Arrangement [Abstract]
Stock-Based Compensation	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 September 30, 2019, 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. As of September 30, 2019, 2,295,587 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 September 30, 2019, 4,632,233 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 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 September 30, Nine months ended September 30, 2019 2018 2019 2018 Cost of revenue Subscription and support $ 386 $ 161 $ 1,142 $ 560 Professional services 456 153 1,296 449 Operating expenses Research and development 2,265 1,624 6,016 4,140 Sales and marketing 2,203 1,397 6,199 3,950 General and administrative 3,913 3,614 11,276 14,220 Total $ 9,223 $ 6,949 $ 25,929 $ 23,319 Stock Options The following table summarizes the option activity under the Plans for the nine months ended September 30, 2019: Options Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (in thousands) Outstanding at December 31, 2018 6,400,175 $ 13.65 6.1 $ 142,340 Granted — — Forfeited (40,203) 16.79 Exercised (1,817,243) 12.38 Outstanding at September 30, 2019 4,542,729 $ 14.13 5.7 $ 134,913 Exercisable at September 30, 2019 3,786,843 $ 13.57 5.4 $ 114,571 Options to purchase Class A common stock generally vest over a three four No options were granted during the nine months ended September 30, 2019 and 2018. The total fair value of options vested during the nine months ended September 30, 2019 and 2018 was approximately $5.0 million and $10.3 million, respectively. Total unrecognized compensation expense of $4.5 million related to options will be recognized over a weighted-average period of 1.5 years. Restricted Stock Units Restricted stock units granted to employees generally vest over a three four three one The following table summarizes the restricted stock unit activity under the Plan for the nine months ended September 30, 2019: Number of Shares Weighted- Average Grant Date Fair Value Unvested at December 31, 2018 2,359,261 $ 23.95 Granted 906,173 43.40 Forfeited (62,767) 28.56 Vested (1) (358,511) 20.35 Unvested at September 30, 2019 2,844,156 $ 30.50 (1) During the nine months ended September 30, 2019, in accordance with our Nonqualified Deferred Compensation Plan, recipients of 250,750 shares had elected to defer settlement of the vested restricted stock units and 274,079 shares were released from deferral. This resulted in total deferred units of 531,292 as of September 30, 2019. Compensation expense associated with unvested restricted stock units is recognized on a straight-line basis over the vesting period. At September 30, 2019, there was approximately $58.3 million of total unrecognized compensation expense related to restricted stock units, which is expected to be recognized over a weighted-average period of 2.4 years. Employee Stock Purchase Plan The fair value of each share issued under the ESPP is estimated on the date of grant using the Black-Scholes option-pricing model. Expected volatility is based on the historical volatility of our common stock. The expected term represents the period of time the ESPP purchase rights are expected to be outstanding. 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 ESPP purchase rights. The fair value of our ESPP purchase rights was estimated assuming no expected dividends and the following weighted-average assumptions: Nine months ended September 30, 2019 2018 Expected term (in years) 0.5 0.5 Risk-free interest rate 1.9% - 2.6% 1.8% - 2.4% Expected volatility 35.2% - 48.6% 22.2% - 36.4% During the nine months ended September 30, 2019, 188,390 shares of common stock were purchased under the ESPP at a weighted-average price of $26.13 per share, resulting in cash proceeds of $4.9 million.

Revenue Recognition

Revenue Recognition	9 Months Ended
	Sep. 30, 2019
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition Disaggregation of Revenue The following table presents our revenues disaggregated by industry (in thousands). Certain prior year amounts have been reclassified to conform with current period presentation. These reclassifications have no impact on total revenue. Three months ended September 30, Nine months ended September 30, 2019 2018 2019 2018 Information technology $ 9,734 $ 7,698 $ 28,897 $ 22,843 Consumer discretionary 8,324 7,248 24,632 20,918 Industrials 8,190 6,890 24,194 20,706 Diversified financials 8,570 6,847 24,271 20,198 Banks 7,476 6,044 21,099 17,628 Healthcare 6,949 5,347 20,463 15,786 Energy 5,515 4,805 16,605 14,303 Other 19,421 15,994 57,465 47,527 Total revenues $ 74,179 $ 60,873 $ 217,626 $ 179,909 The following table presents our revenues disaggregated by type of good or service (in thousands): Three months ended September 30, Nine months ended September 30, 2019 2018 2019 2018 Subscription and support $ 63,022 $ 51,306 $ 179,617 $ 146,613 XBRL professional services 7,767 6,312 28,699 23,080 Other services 3,390 3,255 9,310 10,216 Total revenues $ 74,179 $ 60,873 $ 217,626 $ 179,909 Deferred Revenue We recognized $59.0 million and $47.2 million of revenue during the three months ended September 30, 2019 and 2018, respectively, that was included in the deferred revenue balances at the beginning of the respective periods. We recognized $114.4 million and $93.9 million of revenue during the nine months ended September 30, 2019 and 2018, respectively, that was included in the deferred revenue balances at the beginning of the respective periods. Transaction Price Allocated to the Remaining Performance Obligations

Net Loss Per Share

Net Loss Per Share	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Net Loss Per Share	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 convertible senior notes, outstanding stock options, stock related to unvested restricted stock units, and common stock issuable pursuant to the ESPP to the extent dilutive. Basic and diluted net loss per share was the same for each period presented, as the inclusion of all potential common shares outstanding would have been anti-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. 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 September 30, 2019 September 30, 2018 Class A Class B Class A Class B Numerator Net loss $ (12,978) $ (3,073) $ (8,532) $ (2,432) Denominator Weighted-average common shares outstanding - basic and diluted 37,785,850 8,945,813 34,221,118 9,752,310 Basic and diluted net loss per share $ (0.34) $ (0.34) $ (0.25) $ (0.25) Nine months ended September 30, 2019 September 30, 2018 Class A Class B Class A Class B Numerator Net loss $ (25,422) $ (6,414) $ (32,616) $ (9,734) Denominator Weighted-average common shares outstanding - basic and diluted 36,771,232 9,276,805 33,393,426 9,966,513 Basic and diluted net loss per share $ (0.69) $ (0.69) $ (0.98) $ (0.98) 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 September 30, 2019 September 30, 2018 Shares subject to outstanding common stock options 4,542,729 6,693,724 Shares subject to unvested restricted stock units 3,375,448 2,215,129 Shares issuable pursuant to the ESPP 77,788 108,929

Organization and Significant _2

Organization and Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	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, 2018 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 nine months ended September 30, 2019 are not necessarily indicative of the results expected for the full year ending December 31, 2019.
Principles of Consolidation	All intercompany accounts and transactions have been eliminated in consolidation.
Reclassifications	Additionally, certain prior period amounts have been reclassified for consistency with the current year presentation.
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, discount rates used in the valuation of right-of-use assets and lease liabilities, the fair value of the liability and equity components of the convertible senior notes, 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.
Impairment of Long-Lived Assets	Long-lived assets, such as property, equipment, right-of-use assets and software and intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset group may not be recoverable. If circumstances require that a long-lived asset or asset group be tested for possible impairment, we first compare the undiscounted cash flows expected to be generated by that long-lived asset or asset group to its carrying amount. If the carrying amount of the long-lived asset or asset group is not recoverable on an undiscounted cash flow basis, an impairment is recognized to the extent that the carrying amount exceeds its fair value.
Leases	We determine if an arrangement is a lease at inception. Operating leases are included in operating lease right-of-use (“ROU”) assets, other current liabilities, and operating lease liabilities on our condensed consolidated balance sheets. We currently have no finance leases. ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at the commencement date. Our variable lease payments consist of non-lease services related to the lease. Variable lease payments are excluded from the ROU assets and lease liabilities and are recognized in the period in which the obligation for those payments is incurred. As our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments. The operating lease ROU asset also includes any lease payments made and excludes lease incentives incurred. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. We have lease agreements with lease and non-lease components. We have elected to account for these lease and non-lease components as a single lease component. We are also electing not to apply the recognition requirements to short-term leases of 12 months or less and instead will recognize lease payments as expense on a straight-line basis over the lease term.
Recently Adopted Accounting Pronouncements and New Accounting Pronouncements Not Yet Adopted	Recently Adopted Accounting Pronouncements In February 2016, the Financial Accounting Standards Board (“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 (with the exception of short-term leases). In July 2018, the FASB issued an update (ASU 2018-11) to the existing transition guidance that allows entities to recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. Effective January 1, 2019, we adopted ASC 842 using this new transition guidance. The comparative information has not been restated and continues to be reported under the accounting standard in effect for those periods. We have elected to use the package of practical expedients, which allows us to not (1) reassess whether any expired or existing contracts are considered or contain leases; (2) reassess the lease classification for any expired or existing leases; and (3) reassess the initial direct costs for any existing leases. We did not elect the hindsight practical expedient, which permits entities to use hindsight in determining the lease term and assessing impairment. Adoption of the new standard had a material impact on our condensed consolidated balance sheets. The most significant impacts related to the recognition of right-of-use assets and lease liabilities for operating leases. The adoption of ASC 842 had no impact on our condensed consolidated statements of operations or total cash flows from operations. The cumulative effect of the changes made to our consolidated January 1, 2019 balance sheet for the adoption of ASC 842 were as follows (in thousands): As of December 31, 2018 Adjustments due to ASC 842 adoption As of January 1, 2019 Assets Operating right-of-use asset $ — $ 15,694 $ 15,694 Liabilities Accrued expenses and other current liabilities 36,353 2,319 38,672 Other long-term liabilities 6,891 (6,007) 884 Operating lease liabilities, non-current — 19,382 19,382 In August 2018, the FASB issued ASU 2018-15, Intangibles - Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract, which clarifies the accounting for implementation costs in cloud computing arrangements. The update will become effective for interim and annual periods beginning after December 15, 2019 and may be adopted either retrospectively or prospectively. Early adoption is permitted. We adopted this standard prospectively effective April 1, 2019. The adoption of this new guidance did not have a material impact on our consolidated financial statements. New Accounting Pronouncements Not Yet Adopted In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which amends the current accounting guidance and requires the measurement of all expected losses based on historical experience, current conditions and reasonable and supportable forecasts. For trade receivables, loans, and other financial instruments, we will be required to use a forward-looking expected loss model that reflects probable losses rather than the incurred loss model for recognizing credit losses. The standard will become effective for interim and annual periods beginning after December 15, 2019, with early adoption permitted. Application of the amendments is through a cumulative-effect adjustment to retained earnings as of the effective date. We plan to adopt this standard on the effective date and are currently evaluating the impact of this new standard on our consolidated financial statements.
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	The fair value of each share issued under the ESPP is estimated on the date of grant using the Black-Scholes option-pricing model. Expected volatility is based on the historical volatility of our common stock. The expected term represents the period of time the ESPP purchase rights are expected to be outstanding. 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 ESPP purchase rights.

Organization and Significant _3

Organization and Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2019
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, 2019 balance sheet for the adoption of ASC 842 were as follows (in thousands): As of December 31, 2018 Adjustments due to ASC 842 adoption As of January 1, 2019 Assets Operating right-of-use asset $ — $ 15,694 $ 15,694 Liabilities Accrued expenses and other current liabilities 36,353 2,319 38,672 Other long-term liabilities 6,891 (6,007) 884 Operating lease liabilities, non-current — 19,382 19,382

Supplemental Consolidated Bal_2

Supplemental Consolidated Balance Sheet Information (Tables)	9 Months Ended
	Sep. 30, 2019
Payables and Accruals [Abstract]
Schedule of Accrued Expenses and Other Current Liabilities	Accrued expenses and other current liabilities consisted of the following (in thousands): As of September 30, 2019 As of December 31, 2018 Accrued vacation $ 8,095 $ 6,906 Accrued commissions 4,574 7,265 Accrued bonuses 11,348 5,643 Estimated health insurance claims 1,150 1,100 ESPP employee contributions 2,026 2,156 Customer deposits 10,814 7,395 Operating lease liabilities 2,827 — Accrued other liabilities 6,468 5,888 $ 47,302 $ 36,353

Cash Equivalents and Marketab_2

Cash Equivalents and Marketable Securities (Tables)	9 Months Ended
	Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Schedule of Marketable Securities	At September 30, 2019, marketable securities consisted of the following (in thousands): Amortized Cost Unrealized Gains Unrealized Losses Aggregate Fair Value Money market funds $ 368,634 $ — $ — $ 368,634 U.S. treasury debt securities 10,284 2 (1) 10,285 U.S. corporate debt securities 85,216 148 (5) 85,359 $ 464,134 $ 150 $ (6) $ 464,278 Included in cash and cash equivalents $ 368,634 $ — $ — $ 368,634 Included in marketable securities $ 95,500 $ 150 $ (6) $ 95,644 At December 31, 2018, marketable securities consisted of the following (in thousands): Amortized Cost Unrealized Gains Unrealized Losses Aggregate Fair Value Money market funds $ 52,068 $ — $ — $ 52,068 Commercial paper 7,448 — — 7,448 U.S. treasury debt securities 2,494 — (1) 2,493 U.S. corporate debt securities 10,890 — (67) 10,823 $ 72,900 $ — $ (68) $ 72,832 Included in cash and cash equivalents $ 52,068 $ — $ — $ 52,068 Included in marketable securities $ 20,832 $ — $ (68) $ 20,764
Schedule of Cash and Cash Equivalents	At September 30, 2019, marketable securities consisted of the following (in thousands): Amortized Cost Unrealized Gains Unrealized Losses Aggregate Fair Value Money market funds $ 368,634 $ — $ — $ 368,634 U.S. treasury debt securities 10,284 2 (1) 10,285 U.S. corporate debt securities 85,216 148 (5) 85,359 $ 464,134 $ 150 $ (6) $ 464,278 Included in cash and cash equivalents $ 368,634 $ — $ — $ 368,634 Included in marketable securities $ 95,500 $ 150 $ (6) $ 95,644 At December 31, 2018, marketable securities consisted of the following (in thousands): Amortized Cost Unrealized Gains Unrealized Losses Aggregate Fair Value Money market funds $ 52,068 $ — $ — $ 52,068 Commercial paper 7,448 — — 7,448 U.S. treasury debt securities 2,494 — (1) 2,493 U.S. corporate debt securities 10,890 — (67) 10,823 $ 72,900 $ — $ (68) $ 72,832 Included in cash and cash equivalents $ 52,068 $ — $ — $ 52,068 Included in marketable securities $ 20,832 $ — $ (68) $ 20,764
Schedule of Available-for-sale Securities, Continuous Unrealized Loss Position	The following table presents gross unrealized losses and fair values for those marketable securities that were in an unrealized loss position as of September 30, 2019, aggregated by investment category and the length of time that individual securities have been in a continuous loss position (in thousands): As of September 30, 2019 Less than 12 months 12 months or greater Fair Value Unrealized Loss Fair Value Unrealized Loss U.S. treasury debt securities $ 6,339 $ (1) $ — $ — U.S. corporate debt securities 7,691 (3) 3,000 (2) Total $ 14,030 $ (4) $ 3,000 $ (2)

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2019
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 September 30, 2019 Fair Value Measurements as of December 31, 2018 Description Total Level 1 Level 2 Total Level 1 Level 2 Money market funds $ 368,634 $ 368,634 $ — $ 52,068 $ 52,068 $ — Commercial paper — — — 7,448 — 7,448 U.S. treasury debt securities 10,285 — 10,285 2,493 — 2,493 U.S. corporate debt securities 85,359 — 85,359 10,823 — 10,823 $ 464,278 $ 368,634 $ 95,644 $ 72,832 $ 52,068 $ 20,764 Included in cash and cash equivalents $ 368,634 $ 52,068 Included in marketable securities $ 95,644 $ 20,764

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Summary of Lease Expense Components, Supplemental Cash Flow Information and Other Information	The components of lease expense were as follows (in thousands): Three months ended September 30, 2019 Nine months ended September 30, 2019 Operating lease cost $ 837 $ 2,600 Short-term lease cost 347 885 Variable lease cost 259 691 $ 1,443 $ 4,176 Supplemental cash flow information related to leases was as follows (in thousands): Three months ended September 30, 2019 Nine months ended September 30, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 1,031 $ 3,111 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ — $ 2,033 Other supplemental information related to leases was as follows: As of September 30, 2019 Weighted Average Remaining Lease Term (in years) Operating leases 7.9 Weighted Average Discount Rate Operating leases 5.7 %
Summary of Future Estimated Minimum Lease Payments	As of September 30, 2019, future estimated minimum lease payments under non-cancelable operating leases were as follows (in thousands): Operating Leases Remainder of 2019 $ 910 2020 4,153 2021 4,237 2022 3,872 2023 3,540 Thereafter 11,255 Total minimum lease payments 27,967 Less: Amount representing interest (5,867) Total $ 22,100

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Summary of Convertible Debt	The net carrying amount of the liability and equity components of the Notes was as follows (in thousands): September 30, 2019 Liability component: Principal $ 345,000 Unamortized discount (59,184) Unamortized issuance costs (7,394) Net carrying amount $ 278,422 Equity component, net of purchase discounts and issuance costs $ 58,560 Interest expense related to the Notes is as follows (in thousands): Three and Nine Months Ended September 30, 2019 Contractual interest expense $ 468 Amortization of debt discount 963 Amortization of issuance costs 120 Total interest expense $ 1,551

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2019
Share-based Payment Arrangement [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 September 30, Nine months ended September 30, 2019 2018 2019 2018 Cost of revenue Subscription and support $ 386 $ 161 $ 1,142 $ 560 Professional services 456 153 1,296 449 Operating expenses Research and development 2,265 1,624 6,016 4,140 Sales and marketing 2,203 1,397 6,199 3,950 General and administrative 3,913 3,614 11,276 14,220 Total $ 9,223 $ 6,949 $ 25,929 $ 23,319
Schedule of Stock-Option Activity	The following table summarizes the option activity under the Plans for the nine months ended September 30, 2019: Options Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (in thousands) Outstanding at December 31, 2018 6,400,175 $ 13.65 6.1 $ 142,340 Granted — — Forfeited (40,203) 16.79 Exercised (1,817,243) 12.38 Outstanding at September 30, 2019 4,542,729 $ 14.13 5.7 $ 134,913 Exercisable at September 30, 2019 3,786,843 $ 13.57 5.4 $ 114,571
Summary of Restricted Stock Units	The following table summarizes the restricted stock unit activity under the Plan for the nine months ended September 30, 2019: Number of Shares Weighted- Average Grant Date Fair Value Unvested at December 31, 2018 2,359,261 $ 23.95 Granted 906,173 43.40 Forfeited (62,767) 28.56 Vested (1) (358,511) 20.35 Unvested at September 30, 2019 2,844,156 $ 30.50
Schedule of Valuation Assumptions, Employee Stock Purchase Plans	The fair value of our ESPP purchase rights was estimated assuming no expected dividends and the following weighted-average assumptions: Nine months ended September 30, 2019 2018 Expected term (in years) 0.5 0.5 Risk-free interest rate 1.9% - 2.6% 1.8% - 2.4% Expected volatility 35.2% - 48.6% 22.2% - 36.4%

Revenue Recognition (Tables)

Revenue Recognition (Tables)	9 Months Ended
	Sep. 30, 2019
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following table presents our revenues disaggregated by industry (in thousands). Certain prior year amounts have been reclassified to conform with current period presentation. These reclassifications have no impact on total revenue. Three months ended September 30, Nine months ended September 30, 2019 2018 2019 2018 Information technology $ 9,734 $ 7,698 $ 28,897 $ 22,843 Consumer discretionary 8,324 7,248 24,632 20,918 Industrials 8,190 6,890 24,194 20,706 Diversified financials 8,570 6,847 24,271 20,198 Banks 7,476 6,044 21,099 17,628 Healthcare 6,949 5,347 20,463 15,786 Energy 5,515 4,805 16,605 14,303 Other 19,421 15,994 57,465 47,527 Total revenues $ 74,179 $ 60,873 $ 217,626 $ 179,909 The following table presents our revenues disaggregated by type of good or service (in thousands): Three months ended September 30, Nine months ended September 30, 2019 2018 2019 2018 Subscription and support $ 63,022 $ 51,306 $ 179,617 $ 146,613 XBRL professional services 7,767 6,312 28,699 23,080 Other services 3,390 3,255 9,310 10,216 Total revenues $ 74,179 $ 60,873 $ 217,626 $ 179,909

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	9 Months Ended
	Sep. 30, 2019
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 September 30, 2019 September 30, 2018 Class A Class B Class A Class B Numerator Net loss $ (12,978) $ (3,073) $ (8,532) $ (2,432) Denominator Weighted-average common shares outstanding - basic and diluted 37,785,850 8,945,813 34,221,118 9,752,310 Basic and diluted net loss per share $ (0.34) $ (0.34) $ (0.25) $ (0.25) Nine months ended September 30, 2019 September 30, 2018 Class A Class B Class A Class B Numerator Net loss $ (25,422) $ (6,414) $ (32,616) $ (9,734) Denominator Weighted-average common shares outstanding - basic and diluted 36,771,232 9,276,805 33,393,426 9,966,513 Basic and diluted net loss per share $ (0.69) $ (0.69) $ (0.98) $ (0.98)
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 September 30, 2019 September 30, 2018 Shares subject to outstanding common stock options 4,542,729 6,693,724 Shares subject to unvested restricted stock units 3,375,448 2,215,129 Shares issuable pursuant to the ESPP 77,788 108,929

Organization and Significant _4

Organization and Significant Accounting Policies - Accounting Policies (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Assets
Operating lease right-of-use assets	$ 15,917	$ 15,694
Liabilities
Accrued expenses and other current liabilities	47,302	38,672	$ 36,353
Other long-term liabilities	1,387	884	$ 6,891
Operating lease liabilities, non-current	$ 19,273	19,382
Accounting Standards Update 2016-02
Assets
Operating lease right-of-use assets		15,694
Liabilities
Accrued expenses and other current liabilities		2,319
Other long-term liabilities		(6,007)
Operating lease liabilities, non-current		$ 19,382

Supplemental Consolidated Bal_3

Supplemental Consolidated Balance Sheet Information - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Accrued Liabilities and Other Liabilities [Abstract]
Accrued vacation	$ 8,095		$ 6,906
Accrued commissions	4,574		7,265
Accrued bonuses	11,348		5,643
Estimated health insurance claims	1,150		1,100
ESPP employee contributions	2,026		2,156
Customer deposits	10,814		7,395
Operating lease liabilities	2,827
Accrued other liabilities	6,468		5,888
Accrued expenses and other current liabilities	$ 47,302	$ 38,672	$ 36,353

Cash Equivalents and Marketab_3

Cash Equivalents and Marketable Securities - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 389,124	$ 77,584
Debt Securities, Available-for-sale [Line Items]
Unrealized Gains	150	0
Unrealized Losses	(6)	(68)
Cash and cash equivalents and available-for-sale securities, amortized cost	464,134	72,900
Cash, cash equivalents, and available-for-sale securities	464,278	72,832
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		7,448
Unrealized Gains		0
Unrealized Losses		0
Aggregate Fair Value		7,448
U.S. treasury debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,284	2,494
Unrealized Gains	2	0
Unrealized Losses	(1)	(1)
Aggregate Fair Value	10,285	2,493
U.S. corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	85,216	10,890
Unrealized Gains	148	0
Unrealized Losses	(5)	(67)
Aggregate Fair Value	85,359	10,823
Money market funds
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	368,634	52,068
Cash and cash equivalents, aggregate fair value	368,634	52,068
Cash and cash equivalents
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	368,634	52,068
Cash and cash equivalents, aggregate fair value	368,634	52,068
Marketable securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	95,500	20,832
Unrealized Gains	150	0
Unrealized Losses	(6)	(68)
Aggregate Fair Value	$ 95,644	$ 20,764

Cash Equivalents and Marketab_4

Cash Equivalents and Marketable Securities - Continuous Unrealized Loss Position (Details) $ in Thousands	Sep. 30, 2019USD ($)
Fair Value
Less than 12 months	$ 14,030
12 months or greater	3,000
Unrealized Loss
Less than 12 months	(4)
12 months or greater	(2)
U.S. treasury debt securities
Fair Value
Less than 12 months	6,339
12 months or greater	0
Unrealized Loss
Less than 12 months	(1)
12 months or greater	0
U.S. corporate debt securities
Fair Value
Less than 12 months	7,691
12 months or greater	3,000
Unrealized Loss
Less than 12 months	(3)
12 months or greater	$ (2)

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Cash and cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents - money market funds	$ 368,634	$ 52,068
Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	95,644	20,764
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities		7,448
U.S. treasury debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	10,285	2,493
U.S. corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	85,359	10,823
Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents - money market funds	368,634	52,068
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of convertible debt	314,200
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	464,278	72,832
Recurring | Cash and cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents - money market funds	368,634	52,068
Recurring | Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	95,644	20,764
Recurring | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	7,448
Recurring | U.S. treasury debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	10,285	2,493
Recurring | U.S. corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	85,359	10,823
Recurring | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents - money market funds	368,634	52,068
Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	368,634	52,068
Recurring | Level 1 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable 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	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	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 - money market funds	368,634	52,068
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	95,644	20,764
Recurring | Level 2 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	7,448
Recurring | Level 2 | U.S. treasury debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	10,285	2,493
Recurring | Level 2 | U.S. corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	85,359	10,823
Recurring | Level 2 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents - money market funds	$ 0	$ 0

Leases (Details)

Leases (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019USD ($)	Sep. 30, 2019USD ($)renewal_option
Lease, Cost [Abstract]
Operating lease cost	$ 837	$ 2,600
Short-term lease cost	347	885
Variable lease cost	259	691
Total lease cost	1,443	4,176
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	1,031	3,111
Right-of-use assets obtained in exchange for lease obligations: Operating leases	$ 0	$ 2,033
Weighted Average Remaining Lease Term (in years) - Operating leases	7 years 10 months 24 days	7 years 10 months 24 days
Weighted Average Discount Rate - Operating leases	5.70%	5.70%
Operating Lease Liabilities, Payments Due [Abstract]
Remainder of 2019	$ 910	$ 910
2020	4,153	4,153
2021	4,237	4,237
2022	3,872	3,872
2023	3,540	3,540
Thereafter	11,255	11,255
Total minimum lease payments	27,967	27,967
Less: Amount representing interest	(5,867)	(5,867)
Total	$ 22,100	$ 22,100
Office
Lessee, Lease, Description [Line Items]
Number of renewal options (or more) | renewal_option		1
Office | Minimum
Lessee, Lease, Description [Line Items]
Renewal term	3 years	3 years
Office | Maximum
Lessee, Lease, Description [Line Items]
Renewal term	5 years	5 years

Debt (Details)

Debt (Details)	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2019USD ($)day$ / shares	Sep. 30, 2019USD ($)$ / shares	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)$ / shares	Sep. 30, 2018USD ($)	Dec. 31, 2018$ / shares	Aug. 31, 2014USD ($)
Debt Instrument [Line Items]
Proceeds from the issuance of convertible senior notes, net of issuance costs		$ 335,899,000	$ 0	$ 335,899,000	$ 0
Class A Common Stock
Debt Instrument [Line Items]
Common stock, par value (in dollars per share) | $ / shares		$ 0.001		$ 0.001		$ 0.001
Line of credit | Silicon Valley Bank
Debt Instrument [Line Items]
Maximum borrowing capacity							$ 15,000,000
Convertible debt | 1.125% Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Face amount of debt issued	$ 345,000,000
Stated interest percentage	1.125%
Proceeds from the issuance of convertible senior notes, net of issuance costs	$ 335,900,000
Conversion ratio	0.0124756
Conversion price (in dollars per share) | $ / shares	$ 80.16
Threshold percentage of stock price trigger	130.00%
Threshold percentage of stock trading price	98.00%
Redemption price, percentage	100.00%
Effective interest percentage	4.30%
Equity component, gross amount	$ 60,100,000
Issuance costs attributable to the liability component	7,500,000
Issuance costs attributable to the equity component	1,600,000
Convertible debt | Over-allotment option
Debt Instrument [Line Items]
Face amount of debt issued	$ 45,000,000
Debt Conversion Terms, One | Convertible debt | 1.125% Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Threshold number of trading days (day) | day	20
Threshold number of consecutive trading days (day) | day	30
Debt Conversion Terms, Two | Convertible debt | 1.125% Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Threshold number of trading days (day) | day	5
Threshold number of consecutive trading days (day) | day	10

Debt - Summary of Convertible D

Debt - Summary of Convertible Debt (Details) - 1.125% Convertible Senior Notes Due 2026 - Convertible debt $ in Thousands	Sep. 30, 2019USD ($)
Debt Instrument [Line Items]
Principal	$ 345,000
Unamortized discount	(59,184)
Unamortized issuance costs	(7,394)
Net carrying amount	278,422
Equity component, net of purchase discounts and issuance costs	$ 58,560

Debt - Summary of Interest Expe

Debt - Summary of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Debt Disclosure [Abstract]
Contractual interest expense	$ 468	$ 468
Amortization of debt discount	963	963
Amortization of issuance costs	120	120
Total interest expense	$ 1,551	$ 1,551

Commitments and Contingencies (

Commitments and Contingencies (Details) - Cloud Services Arrangement $ in Thousands	Sep. 30, 2019USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
Purchase commitment due in 2019	$ 18
Purchase commitment due in 2020	1,200
Purchase commitment due in 2021	2,300
Purchase commitment due in 2022	$ 1,200

Stock-Based Compensation - Narr

Stock-Based Compensation - Narrative (Details) - USD ($)	Jun. 13, 2017	Sep. 30, 2019
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		4,632,233
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]
Number of shares available for grant		2,295,587

Stock-Based Compensation - Expe

Stock-Based Compensation - Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	$ 9,223	$ 6,949	$ 25,929	$ 23,319
Research and development
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	2,265	1,624	6,016	4,140
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	2,203	1,397	6,199	3,950
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	3,913	3,614	11,276	14,220
Subscription and support | Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	386	161	1,142	560
Professional services | Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	$ 456	$ 153	$ 1,296	$ 449

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Options (in shares):
Outstanding beginning of the period (in shares)	6,400,175
Granted (in shares)	0	0
Forfeited (in shares)	(40,203)
Exercised (in shares)	(1,817,243)
Outstanding end of the period (in shares)	4,542,729		6,400,175
Exercisable (in shares)	3,786,843
Weighted-Average Exercise Price (in dollars per share):
Outstanding beginning of the period (in dollars per share)	$ 13.65
Granted (in dollars per share)	0
Forfeited (in dollars per share)	16.79
Exercised (in dollars per share)	12.38
Outstanding end of the period (in dollars per share)	14.13		$ 13.65
Exercisable (in dollars per share)	$ 13.57
Outstanding, weighted-average remaining contractual term (years)	5 years 8 months 12 days		6 years 1 month 6 days
Exercisable, weighted-average remaining contractual term (years)	5 years 4 months 24 days
Outstanding, aggregate intrinsic value	$ 134,913		$ 142,340
Exercisable, aggregate intrinsic value	114,571
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options exercised intrinsic value	69,600	$ 22,100
Options vested in period fair value	5,000	$ 10,300
Options unrecognized compensation expense	$ 4,500
Employee stock options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options unrecognized compensation expense, period for recognition (years)	1 year 6 months
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 - Rest

Stock-Based Compensation - Restricted Stock Units (Details) - Restricted stock units - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested in period, fair value	$ 7.3	$ 7.2
Number of Shares (in shares)
Unvested at beginning of period (in shares)	2,359,261
Granted (in shares)	906,173
Forfeited (in shares)	(62,767)
Vested (in shares)	(358,511)
Unvested at end of period (in shares)	2,844,156
Weighted- Average Grant Date Fair Value (in dollars per share)
Unvested at beginning of period (in dollars per share)	$ 23.95
Granted (in dollars per share)	43.40
Forfeited (in dollars per share)	28.56
Vested (in dollars per share)	20.35
Unvested at end of period (in dollars per share)	$ 30.50
Number of vested shares recipient elected to defer settlement (in shares)	250,750
Number of vested shares recipients elected to defer settlement, released during period (in shares)	274,079
Number of deferred shares vested and outstanding (in shares)	531,292
Unrecognized compensation expense	$ 58.3
Unrecognized compensation expense, period for recognition (years)	2 years 4 months 24 days
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)	3 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)	4 years
Cliff-vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)	3 years
Cliff-vesting | Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)	1 year

Stock-Based Compensation - Empl

Stock-Based Compensation - Employee Stock Purchase Plan (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from shares issued in connection with employee stock purchase plan	$ 2,773	$ 1,846	$ 4,922	$ 3,216
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)			6 months	6 months
Risk-free interest rate, min (as percent)			1.90%	1.80%
Risk-free interest rate, max (as percent)			2.60%	2.40%
Expected volatility, min (as percent)			35.20%	22.20%
Expected volatility, max (as percent)			48.60%	36.40%
Unrecognized compensation expense	$ 681		$ 681
Unrecognized compensation expense, period for recognition (years)			3 months 18 days
Class A Common Stock | Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period (in shares)			188,390
Shares issued during period, weighted average price per share (in dollars per share)			$ 26.13
Proceeds from shares issued in connection with employee stock purchase plan			$ 4,900

Revenue Recognition - Disaggreg

Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenue	$ 74,179	$ 60,873	$ 217,626	$ 179,909
Subscription and support
Disaggregation of Revenue [Line Items]
Total revenue	63,022	51,306	179,617	146,613
XBRL professional services
Disaggregation of Revenue [Line Items]
Total revenue	7,767	6,312	28,699	23,080
Other services
Disaggregation of Revenue [Line Items]
Total revenue	3,390	3,255	9,310	10,216
Information technology
Disaggregation of Revenue [Line Items]
Total revenue	9,734	7,698	28,897	22,843
Consumer discretionary
Disaggregation of Revenue [Line Items]
Total revenue	8,324	7,248	24,632	20,918
Industrials
Disaggregation of Revenue [Line Items]
Total revenue	8,190	6,890	24,194	20,706
Diversified financials
Disaggregation of Revenue [Line Items]
Total revenue	8,570	6,847	24,271	20,198
Banks
Disaggregation of Revenue [Line Items]
Total revenue	7,476	6,044	21,099	17,628
Healthcare
Disaggregation of Revenue [Line Items]
Total revenue	6,949	5,347	20,463	15,786
Energy
Disaggregation of Revenue [Line Items]
Total revenue	5,515	4,805	16,605	14,303
Other
Disaggregation of Revenue [Line Items]
Total revenue	$ 19,421	$ 15,994	$ 57,465	$ 47,527

Revenue Recognition - Deferred

Revenue Recognition - Deferred Revenue and Transaction Price Allocated to the Remaining Performance Obligations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Deferred revenue recognized	$ 59	$ 47.2	$ 114.4	$ 93.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected to be recognized	212.9		212.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected to be recognized	$ 162.6		$ 162.6
Expected period of recognition	12 months		12 months

Net Loss Per Share - Earnings P

Net Loss Per Share - Earnings Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Denominator
Weighted-average common shares outstanding - basic and diluted (in shares)	46,731,663	43,973,428	46,048,037	43,359,939
Basic and diluted net loss per share (in dollars per share)	$ (0.34)	$ (0.25)	$ (0.69)	$ (0.98)
Class A Common Stock
Numerator
Net loss	$ (12,978)	$ (8,532)	$ (25,422)	$ (32,616)
Denominator
Weighted-average common shares outstanding - basic and diluted (in shares)	37,785,850	34,221,118	36,771,232	33,393,426
Basic and diluted net loss per share (in dollars per share)	$ (0.34)	$ (0.25)	$ (0.69)	$ (0.98)
Class B Common Stock
Numerator
Net loss	$ (3,073)	$ (2,432)	$ (6,414)	$ (9,734)
Denominator
Weighted-average common shares outstanding - basic and diluted (in shares)	8,945,813	9,752,310	9,276,805	9,966,513
Basic and diluted net loss per share (in dollars per share)	$ (0.34)	$ (0.25)	$ (0.69)	$ (0.98)

Net Loss Per Share - Antidiluti

Net Loss Per Share - Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
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)	4,542,729	6,693,724
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)	3,375,448	2,215,129
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)	77,788	108,929

Uncategorized Items - wk-201909

Label	Element	Value
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 8,381,000
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 8,381,000