Forescout (FSCT) 10-Q 6 Nov 19 2019 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Nov. 01, 2019
Cover page.
Document Type	10-Q
Document Fiscal Period Focus	Q3
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Amendment Flag	false
Document Fiscal Year Focus	2019
Current Fiscal Year End Date	--12-31
Entity File Number	001-38253
Entity Registrant Name	FORESCOUT TECHNOLOGIES, INC
Entity Central Index Key	0001145057
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	51-0406800
Entity Address, Address Line One	190 West Tasman Drive
Entity Address, City or Town	San Jose
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95134
City Area Code	408
Local Phone Number	213-3191
Title of 12(b) Security	Common Stock, par value $0.001 per share
Trading Symbol	FSCT
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		47,173,269

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 55,436	$ 66,895
Marketable securities	38,235	47,632
Accounts receivable	84,539	79,255
Inventory	782	1,501
Deferred commissions - current	12,231	12,543
Prepaid expenses and other current assets	13,564	13,353
Total current assets	204,787	221,179
Deferred commissions - non-current	22,584	22,831
Property and equipment, net	24,022	24,349
Operating lease right-of-use assets	30,404	0
Restricted cash - non-current	1,257	1,266
Intangible assets, net	16,591	19,002
Goodwill	92,045	92,482
Other assets	7,306	7,369
Total assets	398,996	388,478
Current liabilities:
Accounts payable	10,654	12,118
Accrued compensation	29,562	32,649
Accrued expenses	15,268	14,558
Deferred revenue - current	104,739	101,900
Notes payable - current	7,397	7,331
Operating lease liabilities - current	5,217	0
Total current liabilities	172,837	168,556
Deferred revenue - non-current	71,948	69,618
Notes payable - non-current	2,692	8,248
Operating lease liabilities - non-current	33,342	0
Other liabilities	24,336	14,335
Total liabilities	305,155	260,757
Stockholders' equity:
Common stock, $0.001 par value; 1,000,000 shares authorized; 45,133 and 43,403 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively	47	43
Additional paid-in capital	704,192	639,237
Accumulated other comprehensive loss	(616)	(302)
Accumulated deficit	(609,782)	(511,257)
Total stockholders’ equity	93,841	127,721
Total liabilities and stockholders' equity	$ 398,996	$ 388,478

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	47,109,000	43,403,000
Common stock, shares outstanding (in shares)	47,109,000	43,403,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue:
Revenue	$ 91,622	$ 85,628	$ 245,470	$ 212,919
Cost of revenue:
Cost of revenue	21,697	19,197	58,153	50,396
Total gross profit	69,925	66,431	187,317	162,523
Operating expenses:
Research and development	20,556	15,062	58,493	44,552
Sales and marketing	51,035	46,098	163,131	133,416
General and administrative	15,318	13,880	47,369	40,872
Total operating expenses	86,909	75,040	268,993	218,840
Loss from operations	(16,984)	(8,609)	(81,676)	(56,317)
Interest expense	(156)	(208)	(391)	(676)
Other income, net	374	865	1,496	2,040
Loss before income taxes	(16,766)	(7,952)	(80,571)	(54,953)
Income tax provision	16,747	334	17,954	1,935
Net loss	$ (33,513)	$ (8,286)	$ (98,525)	$ (56,888)
Net loss per share, basic and diluted (in dollars per share)	$ (0.72)	$ (0.20)	$ (2.17)	$ (1.41)
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	46,584	42,064	45,433	40,294
License
Revenue:
Revenue	$ 50,203	$ 51,082	$ 126,714	$ 115,185
Cost of revenue:
Cost of revenue	9,892	8,947	23,121	21,002
Subscription
Revenue:
Revenue	36,570	30,339	105,191	85,684
Cost of revenue:
Cost of revenue	5,376	4,069	16,182	11,602
Professional services
Revenue:
Revenue	4,849	4,207	13,565	12,050
Cost of revenue:
Cost of revenue	$ 6,429	$ 6,181	$ 18,850	$ 17,792

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	$ (33,513)	$ (8,286)	$ (98,525)	$ (56,888)
Other comprehensive income (loss), net of tax:
Change in unrealized gains (losses) on marketable securities	3	135	138	(35)
Foreign currency translation adjustments	0	0	(452)	0
Comprehensive loss	$ (33,510)	$ (8,151)	$ (98,839)	$ (56,923)

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Stockholders’ Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Stockholders' equity, beginning balance (in shares) at Dec. 31, 2017		38,122,000
Stockholders' equity, beginning balance at Dec. 31, 2017	$ 115,491	$ 38	$ 551,986	$ (112)	$ (436,421)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive loss, net of tax	(246)			(246)
Stock-based compensation	13,590		13,590
Issuance of common stock in connection with employee equity incentive plans (in shares)		567,000
Issuance of common stock in connection with employee equity incentive plans	3,622	$ 1	3,621
Issuance of common stock in connection with public offering, net of underwriter discounts and commissions and offering costs (in shares)		500,000
Issuance of common stock in connection with public offering, net of underwriter discounts and commissions and offering costs	12,572	$ 0	12,572
Vesting of early exercised stock options (in shares)		25,000
Vesting of early exercised stock options	219		219
Net loss	(28,196)				(28,196)
Stockholders' equity, ending balance (in shares) at Mar. 31, 2018		39,214,000
Stockholders' equity, ending balance at Mar. 31, 2018	117,052	$ 39	581,988	(358)	(464,617)
Stockholders' equity, beginning balance (in shares) at Dec. 31, 2017		38,122,000
Stockholders' equity, beginning balance at Dec. 31, 2017	115,491	$ 38	551,986	(112)	(436,421)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(56,888)
Stockholders' equity, ending balance (in shares) at Sep. 30, 2018		42,694,000
Stockholders' equity, ending balance at Sep. 30, 2018	125,243	$ 43	618,656	(147)	(493,309)
Stockholders' equity, beginning balance (in shares) at Mar. 31, 2018		39,214,000
Stockholders' equity, beginning balance at Mar. 31, 2018	117,052	$ 39	581,988	(358)	(464,617)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive loss, net of tax	76			76
Stock-based compensation	12,936		12,936
Issuance of common stock in connection with employee equity incentive plans (in shares)		2,256,000
Issuance of common stock in connection with employee equity incentive plans	4,609	$ 3	4,606
Vesting of early exercised stock options (in shares)		24,000
Vesting of early exercised stock options	210		210
Issuance of common stock upon exercise of common stock warrants (in shares)		67,000
Net loss	(20,406)				(20,406)
Stockholders' equity, ending balance (in shares) at Jun. 30, 2018		41,561,000
Stockholders' equity, ending balance at Jun. 30, 2018	114,477	$ 42	599,740	(282)	(485,023)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive loss, net of tax	135			135
Stock-based compensation	13,018		13,018
Issuance of common stock in connection with employee equity incentive plans (in shares)		1,108,000
Issuance of common stock in connection with employee equity incentive plans	5,690	$ 1	5,689
Vesting of early exercised stock options (in shares)		25,000
Vesting of early exercised stock options	209		209
Net loss	(8,286)				(8,286)
Stockholders' equity, ending balance (in shares) at Sep. 30, 2018		42,694,000
Stockholders' equity, ending balance at Sep. 30, 2018	$ 125,243	$ 43	618,656	(147)	(493,309)
Stockholders' equity, beginning balance (in shares) at Dec. 31, 2018	43,403,000	43,403,000
Stockholders' equity, beginning balance at Dec. 31, 2018	$ 127,721	$ 43	639,237	(302)	(511,257)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive loss, net of tax	(1,979)			(1,979)
Stock-based compensation	13,828		13,828
Issuance of common stock in connection with employee equity incentive plans (in shares)		1,706,000
Issuance of common stock in connection with employee equity incentive plans	9,409	$ 2	9,407
Vesting of early exercised stock options (in shares)		24,000
Vesting of early exercised stock options	202		202
Net loss	(34,252)				(34,252)
Stockholders' equity, ending balance (in shares) at Mar. 31, 2019		45,133,000
Stockholders' equity, ending balance at Mar. 31, 2019	$ 114,929	$ 45	662,674	(2,281)	(545,509)
Stockholders' equity, beginning balance (in shares) at Dec. 31, 2018	43,403,000	43,403,000
Stockholders' equity, beginning balance at Dec. 31, 2018	$ 127,721	$ 43	639,237	(302)	(511,257)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with employee equity incentive plans (in shares)	2,228,000
Net loss	$ (98,525)
Stockholders' equity, ending balance (in shares) at Sep. 30, 2019	47,109,000	47,109,000
Stockholders' equity, ending balance at Sep. 30, 2019	$ 93,841	$ 47	704,192	(616)	(609,782)
Stockholders' equity, beginning balance (in shares) at Mar. 31, 2019		45,133,000
Stockholders' equity, beginning balance at Mar. 31, 2019	114,929	$ 45	662,674	(2,281)	(545,509)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive loss, net of tax	1,662			1,662
Stock-based compensation	14,065		14,065
Issuance of common stock in connection with employee equity incentive plans (in shares)		746,000
Issuance of common stock in connection with employee equity incentive plans	7,015	$ 1	7,014
Vesting of early exercised stock options (in shares)		24,000
Vesting of early exercised stock options	204		204
Net loss	(30,760)				(30,760)
Stockholders' equity, ending balance (in shares) at Jun. 30, 2019		45,903,000
Stockholders' equity, ending balance at Jun. 30, 2019	107,115	$ 46	683,957	(619)	(576,269)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive loss, net of tax	3			3
Stock-based compensation	13,822		13,822
Issuance of common stock in connection with employee equity incentive plans (in shares)		1,206,000
Issuance of common stock in connection with employee equity incentive plans	6,414	$ 1	6,413
Vesting of early exercised stock options (in shares)		0
Vesting of early exercised stock options	0		0
Net loss	$ (33,513)				(33,513)
Stockholders' equity, ending balance (in shares) at Sep. 30, 2019	47,109,000	47,109,000
Stockholders' equity, ending balance at Sep. 30, 2019	$ 93,841	$ 47	$ 704,192	$ (616)	$ (609,782)

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net loss	$ (98,525)	$ (56,888)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities
Stock-based compensation	41,715	39,544
Depreciation and amortization	8,777	5,490
Other	(138)	113
Changes in operating assets and liabilities
Accounts receivable	(5,459)	(3,414)
Inventory	713	3,348
Deferred commissions	559	1,143
Prepaid expenses and other current assets	(217)	(1,924)
Other assets	67	(154)
Accounts payable	(1,448)	(6,110)
Accrued compensation	(3,075)	(1,539)
Accrued expenses	2,293	1,027
Deferred revenue	5,028	27,222
Other liabilities	17,022	(466)
Net cash (used in) provided by operating activities	(32,688)	7,392
Cash flows from investing activities:
Purchases of property and equipment	(5,611)	(6,766)
Purchases of marketable securities	(63,569)	(54,530)
Proceeds from maturities of marketable securities	73,345	97,050
Net cash provided by investing activities	4,165	35,754
Cash flows from financing activities:
Repayments of notes payable	(5,625)	(5,625)
Proceeds from sales of shares through employee equity incentive plans	27,376	24,648
Payment related to shares withheld for taxes on vesting of restricted stock units	(4,538)	(10,727)
Proceeds from public offerings, net	0	13,818
Payments of deferred offering costs	0	(1,542)
Net cash provided by financing activities	17,213	20,572
Effect of exchange rate changes on cash and cash equivalents	(4)	0
Net change in cash, cash equivalents, and restricted cash for period	(11,314)	63,718
Cash, cash equivalents, and restricted cash at beginning of period	69,012	67,357
Cash, cash equivalents, and restricted cash at end of period	57,698	131,075
Reconciliation of cash, cash equivalents, and restricted cash within the condensed consolidated balance sheets to the amounts shown in the statements of cash flows above:
Cash and cash equivalents	55,436	129,035
Restricted cash included in prepaid expenses and other current assets	1,005	851
Restricted cash - non-current	$ 1,257	$ 1,189

Description of Business and Sum

Description of Business and Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Summary of Significant Accounting Policies	Description of Business and Summary of Significant Accounting Policies Company and Background Forescout Technologies, Inc. (the “Company”) was incorporated in the State of Delaware and commenced operations in April 2000. The Company designs, develops, and markets device visibility, control, and orchestration software that helps organizations gain complete situational awareness of all devices in their interconnected environment and orchestrate actions to mitigate both their cyber and operational risk. The Company offers its solution across two product groups: (i) products for visibility and control capabilities, and (ii) products for orchestration capabilities. The Company’s products for visibility and control capabilities consist of eyeSight, eyeControl, and SilentDefense. eyeSight and eyeControl provide for visibility and control capabilities across the extended enterprise, from campus to data center to hybrid cloud to operational technology (“OT”) devices, while SilentDefense provides for visibility and control capabilities deeper within the OT portion of the network. The Company’s products for orchestration capabilities are comprised of its portfolio of eyeExtend family of products. The Company offers its solution across two product types: (i) software products and (ii) hardware products. The Company’s software products include eyeSight, eyeControl, eyeExtend, SilentDefense, and SilentDefense Command Center (“Software Products”). The Company’s hardware products include hardware that is sold separately for use with the Company’s Software Products and appliances that are embedded with the Company’s software (“Hardware Products”). The Company sells its Software Products, Hardware Products, support and maintenance contracts, and professional services to end-customers through distributors and resellers, who are supported by the Company’s sales and marketing organization, and to a lesser extent directly to end-customers. Basis of Presentation The accompanying condensed consolidated financial statements have been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) using accounting policies that are consistent with those used in the preparation of the Company’s audited consolidated financial statements for the year ended December 31, 2018 . Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles ("GAAP") have been condensed or omitted as permitted by the SEC's rules and regulations. The Company’s condensed consolidated financial statements include the results of Forescout Technologies, Inc. and its wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. The condensed consolidated financial statements are unaudited and, in the opinion of management, reflect all adjustments, consisting only of normal recurring adjustments, necessary for the fair presentation of the Company’s quarterly results. The condensed consolidated balance sheet as of December 31, 2018 was derived from the audited consolidated financial statements at that date but does not include all the disclosures required by GAAP for the annual financial statements. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 . Prior to the first quarter of fiscal 2019, the Company presented revenue and cost of revenue on the condensed consolidated statements of operations as (i) product and (ii) maintenance and professional services. Under the new presentation of revenue and cost of revenue included in the condensed consolidated statements of operations beginning in the first quarter of fiscal 2019, product has been retitled as license revenue, and maintenance and professional services is now presented as two separate line items on the condensed consolidated statements of operations as (i) subscription and (ii) professional services. The related prior period financial data were adjusted to reflect the new presentation of the Company’s revenue and cost of revenue. There is no impact on total revenue and total cost of revenue. The preparation of interim condensed consolidated financial statements in conformity with GAAP requires management to make use of estimates and assumptions that affect the reported amounts in the condensed consolidated financial statements and accompanying notes. These estimates form the basis of judgments made about carrying values of assets and liabilities, which are not readily apparent from other sources. The areas where management has made estimates requiring judgment include, but are not limited to, the best estimate of standalone selling prices for license and related support, the period over which deferred sales commissions are amortized to expense, accruals, stock-based compensation, provision for income taxes including related reserves, identified intangibles and goodwill, purchase price allocation of an acquired business, and incremental borrowing rate for operating leases. Actual results could differ materially from those estimates. Foreign Currency Prior to July 1, 2019, the Company’s functional currency was the U.S. dollar for the majority of its foreign operations except for Forescout Technologies, B.V. whose functional currency was the Euro. Translation gains and losses from the application of the U.S. dollar as the reporting currency during the period that the Euro was the functional currency for Forescout Technologies, B.V. were included as a component of accumulated other comprehensive loss on the consolidated balance sheets. The Company re-assessed its functional currency and determined that, as of July 1, 2019, its functional currency for Forescout Technologies, B.V. had changed from the Euro to the U.S. dollar following the transfer of all of the intellectual property from Forescout Technologies, B.V. to the Company effective July 1, 2019. The change in functional currency was accounted for prospectively from July 1, 2019 and financial statements prior to and including the period ended June 30, 2019 were not restated for the change in functional currency. Transactions denominated in currencies other than the applicable functional currency are converted to the functional currency at the exchange rate on the transaction date. At period end, monetary assets and liabilities are remeasured using the current exchange rate at the balance sheet date. Non-monetary assets and liabilities and capital accounts are remeasured using historical exchange rates. Revenue and expenses have been remeasured using the average exchange rates in effect during each period. Resulting foreign currency remeasurement gains and losses are recorded in other income (expense), net on the consolidated statements of operations. Summary of Significant Accounting Policies Except for the impact of the adoption of Topic 842, as discussed in Note 5, there have been no changes to the Company’s significant accounting policies described in the Annual Report on Form 10-K for the year ended December 31, 2018 that have had a material impact on the Company’s condensed consolidated financial statements and related notes.

Revenue, Deferred Revenue and D

Revenue, Deferred Revenue and Deferred Commissions	9 Months Ended
	Sep. 30, 2019
Revenue from Contract with Customer [Abstract]
Revenue, Deferred Revenue and Deferred Commissions	Revenue, Deferred Revenue and Deferred Commissions Disaggregation of Revenue The Company generates revenue from the sale of Software Products, Hardware Products, support and maintenance contracts, and professional services. All revenue recognized in the condensed consolidated statements of operations is considered to be revenue from contracts with customers. The following table depicts the disaggregation of revenue according to revenue type and is consistent with how the Company evaluates its financial performance (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Revenue: License Software Products Perpetual license $ 32,044 $ 28,423 $ 78,478 $ 68,718 Term license 1,996 — 13,510 — Hardware Products 16,163 22,659 34,726 46,467 Subscription 36,570 30,339 105,191 85,684 Professional services 4,849 4,207 13,565 12,050 Total revenue $ 91,622 $ 85,628 $ 245,470 $ 212,919 License Revenue License revenue consists of sales of Software Products and Hardware Products. Software Products are sold with either a perpetual license or a term license. License revenue includes the value allocated to license within Software Products subscription contracts. License revenue is recognized at the time of transfer of control, which is generally upon delivery of access to software downloads or shipment, provided that all other revenue recognition criteria have been met. Subscription Revenue Subscription revenue is derived from support and maintenance contracts and the value allocated to support and maintenance within Software Products subscription contracts. Support and maintenance contracts have terms that are generally either one or three years, but can be up to five years . Software Products subscription contracts are available in terms of either one or three years . Subscription revenue is recognized ratably over the term of the contract and any unearned subscription revenue is included in deferred revenue. Professional Services Revenue Professional services revenue is derived primarily from customer fees for optional installation of the Company’s products or training. Generally, the Company recognizes revenue for professional services as the services are rendered. Revenue from Contracts with Customers Contract Assets and Contract Liabilities A contract asset is a right to consideration in exchange for products or services that the Company has transferred to a customer when that right is conditional and is not just subject to the passage of time. The Company’s payment terms typically range between 30 to 90 days. The Company has no material contract assets. A contract liability is an obligation to transfer products or services for which the Company has received consideration, or for which an amount of consideration is due from the customer. Contract liabilities include customer deposits under non-cancelable contracts included in accrued expenses, and current and non-current deferred revenue balances. The Company’s contract balances are reported in a net contract asset or liability position on a contract-by-contract basis at the end of each reporting period. Significant changes in contract liabilities during the periods presented are as follows (in thousands): Three Months Ended September 30, 2019 Contract Liabilities Balance as of June 30, 2019 $ 173,833 Additions 95,285 Gross revenue recognized (91,622 ) Balance as of September 30, 2019 $ 177,496 Nine Months Ended September 30, 2019 Contract Liabilities Balance as of December 31, 2018 $ 172,031 Additions 250,935 Gross revenue recognized (245,470 ) Balance as of September 30, 2019 $ 177,496 During the three months ended September 30, 2019 , the Company recognized revenue of $34.4 million that was included in the contract liabilities balance as of June 30, 2019. During the nine months ended September 30, 2019 , the Company recognized revenue of $83.6 million that was included in the contract liabilities balance as of December 31, 2018 . During the three months ended September 30, 2018 , the Company recognized revenue of $28.5 million that was included in the contract liabilities balance as of June 30, 2018. During the nine months ended September 30, 2018 , the Company recognized revenue of $66.5 million that was included in the contract liabilities balance as of December 31, 2017 . Performance Obligations Contracted not recognized revenue was $180.4 million as of September 30, 2019 , of which the Company expects to recognize approximately 60% of the revenue over the next 12 months and the remainder thereafter.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Financial assets are recorded at fair value on the condensed consolidated balance sheets and are categorized based upon the level of judgment associated with inputs used to measure their fair value. The accounting guidance establishes a fair value hierarchy based on the independence of the source and objective evidence of the inputs used. There are three fair value hierarchies based upon the level of inputs that are significant to fair value measurement: • Level 1 —Observable inputs that reflect quoted prices in active markets for identical assets or liabilities. • Level 2 —Observable inputs that reflect quoted prices for identical assets and liabilities in markets that are not active, quoted prices for similar assets or liabilities in active markets, inputs other than quoted prices that are observable for the assets or liabilities, or inputs that are derived principally from or corroborated by observable market data by correlation or other means. • Level 3 —Inputs that are generally unobservable and are supported by little or no market activity, and typically reflect management’s estimate of assumptions that market participants would use in pricing the asset or liability. There have been no transfers between fair value measurement levels during the periods presented. The following table presents the fair value of the Company’s financial assets according to the fair value hierarchy as of September 30, 2019 and December 31, 2018 (in thousands): September 30, 2019 December 31, 2018 Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Financial assets Cash and cash equivalents: Cash $ 44,843 $ — $ — $ 46,017 $ — $ — Money market accounts 10,593 — — 20,878 — — Total cash and cash equivalents 55,436 — — 66,895 — — Marketable securities: Commercial paper — 5,982 — — 3,991 — Corporate debt securities — 26,237 — — 35,640 — U.S. government securities — 6,016 — — 8,001 — Total marketable securities — 38,235 — — 47,632 — Restricted cash (current and non-current) 2,262 — — 2,117 — — Total financial assets $ 57,698 $ 38,235 $ — $ 69,012 $ 47,632 $ —

Marketable Securities

Marketable Securities	9 Months Ended
	Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Marketable Securities	Marketable Securities The following table summarizes the amortized cost, unrealized gains and losses, and fair value of the Company’s marketable securities as of September 30, 2019 and December 31, 2018 (in thousands): September 30, 2019 December 31, 2018 Amortized Cost Unrealized Gains Unrealized Losses Fair Value Amortized Cost Unrealized Gains Unrealized Losses Fair Value Marketable securities: Available-for-sale: Commercial paper $ 5,982 $ — $ — $ 5,982 $ 3,991 $ — $ — $ 3,991 Corporate debt securities 26,161 76 — 26,237 35,730 — (90 ) 35,640 U.S. government securities 6,009 7 — 6,016 8,012 — (11 ) 8,001 Total marketable securities $ 38,152 $ 83 $ — $ 38,235 $ 47,733 $ — $ (101 ) $ 47,632 The following table summarizes the amortized cost and fair value of the Company’s available-for-sale securities as of September 30, 2019 and December 31, 2018 by the contractual maturity date (in thousands): September 30, 2019 December 31, 2018 Amortized Cost Fair Value Amortized Cost Fair Value Due within one year $ 38,152 $ 38,235 $ 47,733 $ 47,632 Total $ 38,152 $ 38,235 $ 47,733 $ 47,632 The Company had no marketable securities in an unrealized loss position as of September 30, 2019 . The Company had 13 marketable securities in an unrealized loss position as of December 31, 2018 . For individual marketable securities that were in an unrealized loss position as of December 31, 2018 , the fair value and gross unrealized loss for these securities aggregated by investment category and length of time in a continuous unrealized loss position are presented in the following table (in thousands): December 31, 2018 Less Than 12 Months Greater Than 12 Months Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Corporate debt securities $ 4,020 $ (3 ) $ 31,620 $ (87 ) $ 35,640 $ (90 ) U.S. government securities — — 8,001 (11 ) 8,001 (11 ) Total $ 4,020 $ (3 ) $ 39,621 $ (98 ) $ 43,641 $ (101 ) Unrealized losses related to these marketable securities are due to interest rate fluctuations as opposed to credit quality. In addition, the Company does not intend to sell and it is not likely that the Company would be required to sell these marketable securities before recovery of their amortized cost basis, which may be at maturity. As a result, there are no other-than-temporary impairments for these marketable securities as of September 30, 2019 or December 31, 2018 .

Leases

Leases	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Leases	Leases Effective January 1, 2019, the Company adopted the requirements of Accounting Standards Update (“ASU”) No. 2016-02, Leases (“ASU 2016-02”), ASU No. 2018-10, Codification Improvements to Topic 842, Leases (“ASU 2018-10”), and ASU No. 2018-11, Targeted Improvements (“ASU 2018-11”), (collectively “Topic 842”). All amounts and disclosures set forth in this Quarterly Report on Form 10-Q have been updated to comply with Topic 842. The Company adopted Topic 842 effective January 1, 2019 using the transition method to apply the new lease standards at the adoption date and recognized a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The adoption had a material impact on the total assets and total liabilities reported on the Company’s condensed consolidated balance sheets resulting in an increase in long-term assets and total liabilities of approximately $20.3 million as of January 1, 2019 . The adoption of this standard did not have a material impact on the Company’s condensed consolidated statements of operations. The Company has operating leases for corporate offices, vehicles, and office equipment. The leases have remaining lease terms of up to seven years , some of which may include options to extend the leases for up to five years . Leases with an initial term of 12 months or less are not recorded on the balance sheet. The Company recognizes lease expense for these leases on a straight-line basis over the lease term. The Company elected to combine the lease components (e.g., fixed payments including rent, real estate taxes, and insurance costs) and the non-lease components (e.g., common-area maintenance costs) for all classes of underlying assets, and to not reassess prior conclusions related to contracts containing leases, lease classification, and initial direct costs. The Company determines if an arrangement is a lease at inception. Operating leases are included in operating lease right-of-use (“ROU”) assets, current operating lease liabilities, and non-current operating lease liabilities on the Company’s condensed consolidated balance sheets. Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the lease payments over the lease term at commencement date. As most of the Company’s leases do not provide an implicit rate, the Company uses an incremental borrowing rate based on the information available at commencement date in determining the present value of future payments. The operating lease ROU asset also includes any lease payments made and excludes lease incentives and initial direct costs incurred. The lease terms may include options to extend the lease when it is reasonably certain that the Company will exercise that option. Lease expense is recognized on a straight-line basis over the lease term. For the three and nine months ended September 30, 2019 , the Company recognized operating lease cost of $2.8 million and $7.3 million , respectively, which included short-term leases and variable lease costs that were immaterial. Maturities of lease liabilities as of September 30, 2019 were as follows (in thousands): Years Ending December 31, Operating Leases 2019 (excluding the nine months ended September 30, 2019) $ 1,796 2020 7,948 2021 7,598 2022 7,411 2023 7,370 Thereafter 15,632 Total lease payments $ 47,755 Less: Imputed interest 9,196 Present value of lease liabilities $ 38,559 Lease Term and Discount Rate September 30, 2019 Operating leases Weighted-average remaining lease term 6 years Weighted-average discount rate 7.1 % Other information (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 $ 905 $ 4,684 Leased assets obtained in exchange for new operating lease liabilities $ 10,561 $ 14,963

Equity Award Plans

Equity Award Plans	9 Months Ended
	Sep. 30, 2019
Share-based Payment Arrangement [Abstract]
Equity Award Plans	Equity Award Plans Stock-Based Compensation Stock-based compensation expense included in the accompanying condensed consolidated statements of operations is as follows (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Cost of revenue: License $ 75 $ 67 $ 247 $ 174 Subscription 454 349 1,367 1,099 Professional services 415 366 1,237 1,112 Research and development 3,040 2,613 8,809 7,473 Sales and marketing 6,330 6,165 20,014 18,195 General and administrative 3,508 3,458 10,041 11,491 Total $ 13,822 $ 13,018 $ 41,715 $ 39,544 Stock Options The following table summarizes option activity under the Company’s 2000 Stock Option and Incentive Plan and the Company’s 2017 Equity Incentive Plan, and related information (in thousands, except per share and contractual life amounts): Options Outstanding Number Weighted- Weighted- Aggregate Balance—December 31, 2018 6,013 $ 11.65 6.4 $ 86,624 Options exercised (2,228 ) $ 10.24 Options forfeited (189 ) $ 18.06 Balance—September 30, 2019 3,596 $ 12.19 5.8 $ 92,539 Options vested and exercisable—September 30, 2019 3,190 $ 11.24 5.7 $ 85,091 As of September 30, 2019 , the total unrecognized compensation cost related to unvested options was $3.5 million , which is expected to be amortized on a straight-line basis over a weighted-average period of approximately 1.2 years. The fair value of stock option awards granted to employees is estimated using the Black-Scholes option-pricing model. No stock option awards were granted during the three and nine months ended September 30, 2019 and three months ended September 30, 2018. The assumptions used to determine the grant date fair value of employee stock options for the periods presented are as follows: Nine Months Ended September 30, 2018 Fair value of common stock $29.92 – $30.97 Risk-free interest rate 2.4% – 2.8% Expected term (in years) 6.1 Volatility 48% Dividend yield —% Restricted Stock Units (“RSUs”) and Performance Based Stock Units (“PSUs”) The following table summarizes RSU and PSU activity under the Company’s 2000 Stock Option and Incentive Plan and the Company’s 2017 Equity Incentive Plan (the “2017 Plan”), and related information (in thousands, except per share and contractual life amounts): RSUs and PSUs Outstanding Number Weighted- Weighted- Aggregate Balance—December 31, 2018 5,709 $ 28.01 1.8 $ 148,389 Granted 1,599 $ 35.85 Vested (1,333 ) $ 26.98 Forfeited (529 ) $ 29.24 Balance—September 30, 2019 5,446 $ 30.45 1.6 $ 206,521 Beginning in 2019, the Company issued PSUs to select executives under the 2017 Plan. The majority of the PSUs vest over a period of four years from the date of grant subject to both the continued employment of the participant with the Company and the achievement of one or more pre-established financial performance goals. Stock-based compensation expense for PSUs is recognized using the accelerated attribution method over the requisite service periods when it is probable that the performance condition will be achieved. As of September 30, 2019 , the total unrecognized compensation cost related to unvested RSUs and PSUs was $123.8 million , which is expected to be amortized over a weighted-average period of approximately 2.6 years.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company estimates its annual effective tax rate each quarter and specific events are discretely recognized as they occur. For the three and nine months ended September 30, 2019 , the Company recorded a tax provision of $16.7 million and $18.0 million , respectively, representing an effective tax rate of (99.9)% and (22.3)% , respectively. For the three and nine months ended September 30, 2018 , the Company recorded a tax provision of $0.3 million and $1.9 million , respectively, representing an effective tax rate of (4.2)% and (3.5)% , respectively. The Company’s effective tax rates for these periods were negative as it has maintained a valuation allowance on the U.S. losses. The key components of the income tax provision primarily consist of foreign income taxes, unrecognized tax benefits, and U.S. state minimum taxes. The effective tax rate decreased for the three and nine months ended September 30, 2019 as compared to the three and nine months ended September 30, 2018 primarily due to an increase in income tax expense related to the completion of an intra-group transfer of certain intellectual property rights (the “IP”) from the Netherlands to the United States. The Company recognized a discrete tax expense of $17.1 million associated with this IP transfer. The discrete tax expense consists of a current tax expense of $20.8 million for the accrual of an uncertain tax position and a deferred tax benefit of $3.7 million related to the reversal of the acquired intangible asset deferred tax liability. The uncertain tax position, included in other liabilities in the Company’s condensed consolidated balance sheets, was $21.0 million and $1.2 million as of September 30, 2019 and December 31, 2018, respectively. The increase in the uncertain tax position was primarily related to the intra-group transfer of the IP as described above.

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 net loss by basic weighted-average shares outstanding during the period. Diluted net loss per share is computed by dividing net loss by diluted weighted-average shares outstanding, including potentially dilutive securities, unless anti-dilutive. The following table presents the computation of basic and diluted net loss per share (in thousands, except per share amounts): Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Net loss $ (33,513 ) $ (8,286 ) $ (98,525 ) $ (56,888 ) Weighted-average shares used to compute net loss per share, basic and diluted 46,584 42,064 45,433 40,294 Net loss per share, basic and diluted $ (0.72 ) $ (0.20 ) $ (2.17 ) $ (1.41 ) The following securities were excluded from the computation of diluted net loss per share for the periods presented because their inclusion would reduce the net loss per share (in thousands): As of September 30, 2019 2018 Options to purchase common stock 3,596 6,503 Unvested early exercised common shares — 71 Unvested restricted stock units 5,446 5,014 Employee Stock Purchase Plan 172 148

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2019
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Consulting agreement with Night Dragon II, LLC On June 5, 2019, the Company entered into a consulting agreement (the “Consulting Agreement”) with Night Dragon II, LLC (“Night Dragon”). One of the board of directors (“the Board”) of the Company is a principal and the chief executive officer of Night Dragon and will personally provide services to the Company under the Consulting Agreement. Pursuant to the Consulting Agreement, Night Dragon will provide consulting and business development services to the Company, including customer engagement, speaking activities, competitive and market analysis, business development assistance and expertise, and other services as described in the Consulting Agreement. In consideration for the consulting and business development services to the Company, the Board granted the director a number of performance stock units (“PSUs”) with a grant date fair value of $2.1 million . The PSUs will vest on the achievement of certain milestones detailed in the Consulting Agreement, in each case, so long as the Consulting Agreement remains in effect. The term of the Consulting Agreement commenced on June 5, 2019 and will continue for two years or until terminated in accordance with its terms. For the three and nine months ended September 30, 2019 , the stock-based compensation expense related to the Consulting Agreement was included in general and administrative expense and was immaterial. The balance of approximately $1.6 million will be recorded over the remaining period. Related party sale During the three months ended September 30, 2019, the Company sold products and services to a company related to a member of the Company’s board of directors. Specifically, for the three months ended September 30, 2019 , the Company recorded license revenue of $1.5 million and an immaterial amount of subscription revenue relating to this contract. As of September 30, 2019 , the related amounts receivable and deferred revenue were $2.2 million and $0.7 million , respectively.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On October 2, 2019, the Company entered into a definitive Asset Purchase Agreement (the “Purchase Agreement”) to acquire certain assets from Bullguard Israel Ltd., an IoT security company, for a total purchase price of $10.3 million in cash. This transaction is intended to support and to accelerate the Company’s development of cloud-delivered products as part of its end-to-end device visibility and control platform. The Company has not yet completed the accounting for this transaction and is in the process of evaluating the impact of this transaction on its consolidated financial statements.

Description of Business and S_2

Description of Business and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying condensed consolidated financial statements have been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) using accounting policies that are consistent with those used in the preparation of the Company’s audited consolidated financial statements for the year ended December 31, 2018 . Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles ("GAAP") have been condensed or omitted as permitted by the SEC's rules and regulations. The Company’s condensed consolidated financial statements include the results of Forescout Technologies, Inc. and its wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. The condensed consolidated financial statements are unaudited and, in the opinion of management, reflect all adjustments, consisting only of normal recurring adjustments, necessary for the fair presentation of the Company’s quarterly results. The condensed consolidated balance sheet as of December 31, 2018 was derived from the audited consolidated financial statements at that date but does not include all the disclosures required by GAAP for the annual financial statements. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 . Prior to the first quarter of fiscal 2019, the Company presented revenue and cost of revenue on the condensed consolidated statements of operations as (i) product and (ii) maintenance and professional services. Under the new presentation of revenue and cost of revenue included in the condensed consolidated statements of operations beginning in the first quarter of fiscal 2019, product has been retitled as license revenue, and maintenance and professional services is now presented as two separate line items on the condensed consolidated statements of operations as (i) subscription and (ii) professional services. The related prior period financial data were adjusted to reflect the new presentation of the Company’s revenue and cost of revenue. There is no impact on total revenue and total cost of revenue. The preparation of interim condensed consolidated financial statements in conformity with GAAP requires management to make use of estimates and assumptions that affect the reported amounts in the condensed consolidated financial statements and accompanying notes. These estimates form the basis of judgments made about carrying values of assets and liabilities, which are not readily apparent from other sources. The areas where management has made estimates requiring judgment include, but are not limited to, the best estimate of standalone selling prices for license and related support, the period over which deferred sales commissions are amortized to expense, accruals, stock-based compensation, provision for income taxes including related reserves, identified intangibles and goodwill, purchase price allocation of an acquired business, and incremental borrowing rate for operating leases. Actual results could differ materially from those estimates.
Foreign Currency	Foreign Currency Prior to July 1, 2019, the Company’s functional currency was the U.S. dollar for the majority of its foreign operations except for Forescout Technologies, B.V. whose functional currency was the Euro. Translation gains and losses from the application of the U.S. dollar as the reporting currency during the period that the Euro was the functional currency for Forescout Technologies, B.V. were included as a component of accumulated other comprehensive loss on the consolidated balance sheets. The Company re-assessed its functional currency and determined that, as of July 1, 2019, its functional currency for Forescout Technologies, B.V. had changed from the Euro to the U.S. dollar following the transfer of all of the intellectual property from Forescout Technologies, B.V. to the Company effective July 1, 2019. The change in functional currency was accounted for prospectively from July 1, 2019 and financial statements prior to and including the period ended June 30, 2019 were not restated for the change in functional currency. Transactions denominated in currencies other than the applicable functional currency are converted to the functional currency at the exchange rate on the transaction date. At period end, monetary assets and liabilities are remeasured using the current exchange rate at the balance sheet date. Non-monetary assets and liabilities and capital accounts are remeasured using historical exchange rates. Revenue and expenses have been remeasured using the average exchange rates in effect during each period. Resulting foreign currency remeasurement gains and losses are recorded in other income (expense), net on the consolidated statements of operations.
Recently Adopted Accounting Pronouncements	Except for the impact of the adoption of Topic 842, as discussed in Note 5, there have been no changes to the Company’s significant accounting policies described in the Annual Report on Form 10-K for the year ended December 31, 2018 that have had a material impact on the Company’s condensed consolidated financial statements and related notes.
Revenue	Disaggregation of Revenue License Revenue License revenue consists of sales of Software Products and Hardware Products. Software Products are sold with either a perpetual license or a term license. License revenue includes the value allocated to license within Software Products subscription contracts. License revenue is recognized at the time of transfer of control, which is generally upon delivery of access to software downloads or shipment, provided that all other revenue recognition criteria have been met. Subscription Revenue Subscription revenue is derived from support and maintenance contracts and the value allocated to support and maintenance within Software Products subscription contracts. Support and maintenance contracts have terms that are generally either one or three years, but can be up to five years . Software Products subscription contracts are available in terms of either one or three years . Subscription revenue is recognized ratably over the term of the contract and any unearned subscription revenue is included in deferred revenue. Professional Services Revenue Professional services revenue is derived primarily from customer fees for optional installation of the Company’s products or training. Generally, the Company recognizes revenue for professional services as the services are rendered. Revenue from Contracts with Customers Contract Assets and Contract Liabilities A contract asset is a right to consideration in exchange for products or services that the Company has transferred to a customer when that right is conditional and is not just subject to the passage of time. The Company’s payment terms typically range between 30 to 90 days. The Company has no material contract assets. A contract liability is an obligation to transfer products or services for which the Company has received consideration, or for which an amount of consideration is due from the customer. Contract liabilities include customer deposits under non-cancelable contracts included in accrued expenses, and current and non-current deferred revenue balances. The Company’s contract balances are reported in a net contract asset or liability position on a contract-by-contract basis at the end of each reporting period.
Leases	Leases with an initial term of 12 months or less are not recorded on the balance sheet. The Company recognizes lease expense for these leases on a straight-line basis over the lease term. The Company elected to combine the lease components (e.g., fixed payments including rent, real estate taxes, and insurance costs) and the non-lease components (e.g., common-area maintenance costs) for all classes of underlying assets, and to not reassess prior conclusions related to contracts containing leases, lease classification, and initial direct costs.

Revenue, Deferred Revenue and_2

Revenue, Deferred Revenue and Deferred Commissions (Tables)	9 Months Ended
	Sep. 30, 2019
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following table depicts the disaggregation of revenue according to revenue type and is consistent with how the Company evaluates its financial performance (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Revenue: License Software Products Perpetual license $ 32,044 $ 28,423 $ 78,478 $ 68,718 Term license 1,996 — 13,510 — Hardware Products 16,163 22,659 34,726 46,467 Subscription 36,570 30,339 105,191 85,684 Professional services 4,849 4,207 13,565 12,050 Total revenue $ 91,622 $ 85,628 $ 245,470 $ 212,919
Contract with Customer, Liability	Significant changes in contract liabilities during the periods presented are as follows (in thousands): Three Months Ended September 30, 2019 Contract Liabilities Balance as of June 30, 2019 $ 173,833 Additions 95,285 Gross revenue recognized (91,622 ) Balance as of September 30, 2019 $ 177,496 Nine Months Ended September 30, 2019 Contract Liabilities Balance as of December 31, 2018 $ 172,031 Additions 250,935 Gross revenue recognized (245,470 ) Balance as of September 30, 2019 $ 177,496

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Schedule of Fair Value of Financial Assets	The following table presents the fair value of the Company’s financial assets according to the fair value hierarchy as of September 30, 2019 and December 31, 2018 (in thousands): September 30, 2019 December 31, 2018 Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Financial assets Cash and cash equivalents: Cash $ 44,843 $ — $ — $ 46,017 $ — $ — Money market accounts 10,593 — — 20,878 — — Total cash and cash equivalents 55,436 — — 66,895 — — Marketable securities: Commercial paper — 5,982 — — 3,991 — Corporate debt securities — 26,237 — — 35,640 — U.S. government securities — 6,016 — — 8,001 — Total marketable securities — 38,235 — — 47,632 — Restricted cash (current and non-current) 2,262 — — 2,117 — — Total financial assets $ 57,698 $ 38,235 $ — $ 69,012 $ 47,632 $ —

Marketable Securities (Tables)

Marketable Securities (Tables)	9 Months Ended
	Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Schedule of Amortized Cost, Unrealized Losses, and Fair Value of Marketable Securities	The following table summarizes the amortized cost, unrealized gains and losses, and fair value of the Company’s marketable securities as of September 30, 2019 and December 31, 2018 (in thousands): September 30, 2019 December 31, 2018 Amortized Cost Unrealized Gains Unrealized Losses Fair Value Amortized Cost Unrealized Gains Unrealized Losses Fair Value Marketable securities: Available-for-sale: Commercial paper $ 5,982 $ — $ — $ 5,982 $ 3,991 $ — $ — $ 3,991 Corporate debt securities 26,161 76 — 26,237 35,730 — (90 ) 35,640 U.S. government securities 6,009 7 — 6,016 8,012 — (11 ) 8,001 Total marketable securities $ 38,152 $ 83 $ — $ 38,235 $ 47,733 $ — $ (101 ) $ 47,632
Investments Classified by Contractual Maturity Date	The following table summarizes the amortized cost and fair value of the Company’s available-for-sale securities as of September 30, 2019 and December 31, 2018 by the contractual maturity date (in thousands): September 30, 2019 December 31, 2018 Amortized Cost Fair Value Amortized Cost Fair Value Due within one year $ 38,152 $ 38,235 $ 47,733 $ 47,632 Total $ 38,152 $ 38,235 $ 47,733 $ 47,632
Schedule of Unrealized Loss on Marketable Securities	For individual marketable securities that were in an unrealized loss position as of December 31, 2018 , the fair value and gross unrealized loss for these securities aggregated by investment category and length of time in a continuous unrealized loss position are presented in the following table (in thousands): December 31, 2018 Less Than 12 Months Greater Than 12 Months Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Corporate debt securities $ 4,020 $ (3 ) $ 31,620 $ (87 ) $ 35,640 $ (90 ) U.S. government securities — — 8,001 (11 ) 8,001 (11 ) Total $ 4,020 $ (3 ) $ 39,621 $ (98 ) $ 43,641 $ (101 )

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Maturity of Lease Liabilities	Maturities of lease liabilities as of September 30, 2019 were as follows (in thousands): Years Ending December 31, Operating Leases 2019 (excluding the nine months ended September 30, 2019) $ 1,796 2020 7,948 2021 7,598 2022 7,411 2023 7,370 Thereafter 15,632 Total lease payments $ 47,755 Less: Imputed interest 9,196 Present value of lease liabilities $ 38,559
Lease Term and Discount Rate	Lease Term and Discount Rate September 30, 2019 Operating leases Weighted-average remaining lease term 6 years Weighted-average discount rate 7.1 %
Lease Cost	Other information (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 $ 905 $ 4,684 Leased assets obtained in exchange for new operating lease liabilities $ 10,561 $ 14,963

Equity Award Plans (Tables)

Equity Award Plans (Tables)	9 Months Ended
	Sep. 30, 2019
Share-based Payment Arrangement [Abstract]
Schedule of Stock-based Compensation Expense for Employees and Non-Employees	Stock-based compensation expense included in the accompanying condensed consolidated statements of operations is as follows (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Cost of revenue: License $ 75 $ 67 $ 247 $ 174 Subscription 454 349 1,367 1,099 Professional services 415 366 1,237 1,112 Research and development 3,040 2,613 8,809 7,473 Sales and marketing 6,330 6,165 20,014 18,195 General and administrative 3,508 3,458 10,041 11,491 Total $ 13,822 $ 13,018 $ 41,715 $ 39,544
Schedule of Option Activity under the Plans	The following table summarizes option activity under the Company’s 2000 Stock Option and Incentive Plan and the Company’s 2017 Equity Incentive Plan, and related information (in thousands, except per share and contractual life amounts): Options Outstanding Number Weighted- Weighted- Aggregate Balance—December 31, 2018 6,013 $ 11.65 6.4 $ 86,624 Options exercised (2,228 ) $ 10.24 Options forfeited (189 ) $ 18.06 Balance—September 30, 2019 3,596 $ 12.19 5.8 $ 92,539 Options vested and exercisable—September 30, 2019 3,190 $ 11.24 5.7 $ 85,091
Schedule of Assumptions Used to Determine Grant Date Fair Value of Employee Stock Options	The assumptions used to determine the grant date fair value of employee stock options for the periods presented are as follows: Nine Months Ended September 30, 2018 Fair value of common stock $29.92 – $30.97 Risk-free interest rate 2.4% – 2.8% Expected term (in years) 6.1 Volatility 48% Dividend yield —%
Schedule of RSU Activity under the Plans	The following table summarizes RSU and PSU activity under the Company’s 2000 Stock Option and Incentive Plan and the Company’s 2017 Equity Incentive Plan (the “2017 Plan”), and related information (in thousands, except per share and contractual life amounts): RSUs and PSUs Outstanding Number Weighted- Weighted- Aggregate Balance—December 31, 2018 5,709 $ 28.01 1.8 $ 148,389 Granted 1,599 $ 35.85 Vested (1,333 ) $ 26.98 Forfeited (529 ) $ 29.24 Balance—September 30, 2019 5,446 $ 30.45 1.6 $ 206,521
Schedule of PSU Activity under the Plans	The following table summarizes RSU and PSU activity under the Company’s 2000 Stock Option and Incentive Plan and the Company’s 2017 Equity Incentive Plan (the “2017 Plan”), and related information (in thousands, except per share and contractual life amounts): RSUs and PSUs Outstanding Number Weighted- Weighted- Aggregate Balance—December 31, 2018 5,709 $ 28.01 1.8 $ 148,389 Granted 1,599 $ 35.85 Vested (1,333 ) $ 26.98 Forfeited (529 ) $ 29.24 Balance—September 30, 2019 5,446 $ 30.45 1.6 $ 206,521

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Schedule of Computation of Basic and Diluted Net Loss Per Share	The following table presents the computation of basic and diluted net loss per share (in thousands, except per share amounts): Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Net loss $ (33,513 ) $ (8,286 ) $ (98,525 ) $ (56,888 ) Weighted-average shares used to compute net loss per share, basic and diluted 46,584 42,064 45,433 40,294 Net loss per share, basic and diluted $ (0.72 ) $ (0.20 ) $ (2.17 ) $ (1.41 )
Schedule of Securities Excluded from Computation of Diluted Net Loss Per Share	The following securities were excluded from the computation of diluted net loss per share for the periods presented because their inclusion would reduce the net loss per share (in thousands): As of September 30, 2019 2018 Options to purchase common stock 3,596 6,503 Unvested early exercised common shares — 71 Unvested restricted stock units 5,446 5,014 Employee Stock Purchase Plan 172 148

Description of Business and S_3

Description of Business and Summary of Significant Accounting Policies - Company and Background (Details)	9 Months Ended
	Sep. 30, 2019product
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of product groups	2
Number of product types	2

Revenue, Deferred Revenue and_3

Revenue, Deferred Revenue and Deferred Commissions - Disaggregation of Revenue According to Revenue Type (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]
Revenue	$ 91,622	$ 85,628	$ 245,470	$ 212,919
Perpetual license
Disaggregation of Revenue [Line Items]
Revenue	32,044	28,423	78,478	68,718
Term license
Disaggregation of Revenue [Line Items]
Revenue	1,996	0	13,510	0
Hardware products
Disaggregation of Revenue [Line Items]
Revenue	16,163	22,659	34,726	46,467
Subscription
Disaggregation of Revenue [Line Items]
Revenue	36,570	30,339	105,191	85,684
Professional services
Disaggregation of Revenue [Line Items]
Revenue	$ 4,849	$ 4,207	$ 13,565	$ 12,050

Revenue, Deferred Revenue and_4

Revenue, Deferred Revenue and Deferred Commissions - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contract with customer, asset	$ 0		$ 0
Deferred revenue, revenue recognized that was previously deferred	$ 34.4	$ 28.5	$ 83.6	$ 66.5
Support and maintenance
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, performance obligation, description of timing			terms that are generally either one or three years, but can be up to five years
Software products
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, performance obligation, description of timing			terms of either one or three years

Revenue, Deferred Revenue and_5

Revenue, Deferred Revenue and Deferred Commissions - Significant Changes in Contract Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Change In Contract With Customer, Liability [Roll Forward]
Beginning balance	$ 173,833	$ 172,031
Additions	95,285	250,935
Gross revenue recognized	(91,622)	(245,470)
Ending balance	$ 177,496	$ 177,496

Revenue, Deferred Revenue and_6

Revenue, Deferred Revenue and Deferred Commissions - Performance Obligations (Details) $ in Millions	Sep. 30, 2019USD ($)
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation	$ 180.4
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, remaining performance obligation, percentage	60.00%
Performance obligation expected to be satisfied, expected timing	12 months

Fair Value Measurements - Finan

Fair Value Measurements - Financial Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 38,235	$ 47,632
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	5,982	3,991
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	26,237	35,640
U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	6,016	8,001
Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	55,436	66,895
Marketable securities	0	0
Restricted cash (current and non-current)	2,262	2,117
Total financial assets	57,698	69,012
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 | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Recurring | Level 1 | U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Recurring | Level 1 | Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	44,843	46,017
Recurring | Level 1 | Money market accounts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	10,593	20,878
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Marketable securities	38,235	47,632
Restricted cash (current and non-current)	0	0
Total financial assets	38,235	47,632
Recurring | Level 2 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	5,982	3,991
Recurring | Level 2 | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	26,237	35,640
Recurring | Level 2 | U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	6,016	8,001
Recurring | Level 2 | Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Recurring | Level 2 | Money market accounts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Marketable securities	0	0
Restricted cash (current and non-current)	0	0
Total financial assets	0	0
Recurring | Level 3 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Recurring | Level 3 | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Recurring | Level 3 | U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Recurring | Level 3 | Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Recurring | Level 3 | Money market accounts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 0	$ 0

Marketable Securities - Summary

Marketable Securities - Summary of Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 38,152	$ 47,733
Unrealized Gains	83	0
Unrealized Losses	0	(101)
Fair Value	38,235	47,632
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,982	3,991
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	5,982	3,991
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	26,161	35,730
Unrealized Gains	76	0
Unrealized Losses	0	(90)
Fair Value	26,237	35,640
U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,009	8,012
Unrealized Gains	7	0
Unrealized Losses	0	(11)
Fair Value	$ 6,016	$ 8,001

Marketable Securities - Maturit

Marketable Securities - Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Amortized Cost
Due within one year	$ 38,152	$ 47,733
Amortized Cost	38,152	47,733
Fair Value
Due within one year	38,235	47,632
Fair Value	$ 38,235	$ 47,632

Marketable Securities - Narrati

Marketable Securities - Narrative (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2019USD ($)security	Dec. 31, 2018USD ($)security
Investments, Debt and Equity Securities [Abstract]
Marketable securities in unrealized loss positions | security	0	13
Other than temporary impairment | $	$ 0	$ 0

Marketable Securities - Continu

Marketable Securities - Continuous Unrealized Loss Position (Details) $ in Thousands	Dec. 31, 2018USD ($)
Fair Value
Less Than 12 Months	$ 4,020
Greater Than 12 Months	39,621
Total	43,641
Unrealized Loss
Less Than 12 Months	(3)
Greater Than 12 Months	(98)
Total	(101)
Corporate debt securities
Fair Value
Less Than 12 Months	4,020
Greater Than 12 Months	31,620
Total	35,640
Unrealized Loss
Less Than 12 Months	(3)
Greater Than 12 Months	(87)
Total	(90)
U.S. government securities
Fair Value
Less Than 12 Months	0
Greater Than 12 Months	8,001
Total	8,001
Unrealized Loss
Less Than 12 Months	0
Greater Than 12 Months	(11)
Total	$ (11)

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 30,404	$ 30,404		$ 0
Operating lease liabilities	38,559	38,559
Operating lease cost	$ 2,800	$ 7,300
Lease term	7 years	7 years
Lease renewal term	5 years	5 years
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets			$ 20,300
Operating lease liabilities			$ 20,300

Leases - Maturity of Lease Liab

Leases - Maturity of Lease Liabilities (Details) $ in Thousands	Sep. 30, 2019USD ($)
Leases [Abstract]
2019 (excluding the nine months ended September 30, 2019)	$ 1,796
2020	7,948
2021	7,598
2022	7,411
2023	7,370
Thereafter	15,632
Total lease payments	47,755
Less: Imputed interest	9,196
Present value of lease liabilities	$ 38,559

Leases - Additional Disclosures

Leases - Additional Disclosures (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019USD ($)	Sep. 30, 2019USD ($)
Leases [Abstract]
Weighted-average remaining lease term	6 years	6 years
Weighted-average discount rate	7.10%	7.10%
Operating cash flows from operating leases	$ 905	$ 4,684
Leased assets obtained in exchange for new operating lease liabilities	$ 10,561	$ 14,963

Equity Award Plans - Stock-base

Equity Award Plans - Stock-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 13,822	$ 13,018	$ 41,715	$ 39,544
License
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	75	67	247	174
Subscription
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	454	349	1,367	1,099
Professional services
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	415	366	1,237	1,112
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	3,040	2,613	8,809	7,473
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	6,330	6,165	20,014	18,195
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 3,508	$ 3,458	$ 10,041	$ 11,491

Equity Award Plans - Option Act

Equity Award Plans - Option Activity (Details) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019USD ($)$ / sharesshares	Dec. 31, 2018USD ($)$ / sharesshares
Number of Shares
Balance beginning of the period (shares) | shares	6,013,000
Options exercised (shares) | shares	(2,228,000)
Options forfeited (shares) | shares	(189,000)
Balance end of the period (shares) | shares	3,596,000	6,013,000
Options vested and exercisable at end of period (shares) | shares	3,190,000
Weighted- Average Exercise Price
Balance beginning of the period (in dollars per share) | $ / shares	$ 11.65
Options exercised (in dollars per share) | $ / shares	10.24
Options forfeited (in dollars per share) | $ / shares	18.06
Balance end of the period (in dollars per share) | $ / shares	12.19	$ 11.65
Options vested and exercisable at end of period (in dollars per share) | $ / shares	$ 11.24
Weighted- Average Remaining Contractual Life (Years)
Balance	5 years 9 months 18 days	6 years 4 months 24 days
Options vested and exercisable	5 years 8 months 12 days
Aggregate Intrinsic Value
Balance | $	$ 92,539	$ 86,624
Options vested and exercisable | $	$ 85,091

Equity Award Plans - Narrative

Equity Award Plans - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to unvested options	$ 3.5		$ 3.5
Options granted (shares)	0	0	0
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Straight-line basis weighted-average amortization period			1 year 2 months 12 days
RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Straight-line basis weighted-average amortization period			2 years 7 months 6 days
Unrecognized compensation cost	$ 123.8		$ 123.8
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			4 years

Equity Award Plans - Assumption

Equity Award Plans - Assumptions (Details) - Employee stock options	9 Months Ended
	Sep. 30, 2018$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate, minimum	2.40%
Risk-free interest rate, maximum	2.80%
Expected term	6 years 1 month 6 days
Volatility	48.00%
Dividend yield	0.00%
Common stock | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of common stock (in dollars per share)	$ 29.92
Common stock | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of common stock (in dollars per share)	$ 30.97

Equity Award Plans - RSU and PS

Equity Award Plans - RSU and PSU Activity (Details) - RSUs and PSUs - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Number of Shares
Balance at beginning of period (shares)	5,709,000
Granted (shares)	1,599,000
Vested (in shares)	(1,333,000)
Forfeited (shares)	(529,000)
Balance at end of period (shares)	5,446,000	5,709,000
Weighted- Average Grant Date Fair Value Per Share
Balance at beginning of period (in dollars per share)	$ 28.01
RSUs granted (in dollars per share)	35.85
RSUs vested (in dollars per share)	26.98
RSUs forfeited (in dollars per share)	29.24
Balance at end of period (in dollars per share)	$ 30.45	$ 28.01
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures
Weighted- Average Remaining Contractual Life (Years)	1 year 7 months 6 days	1 year 9 months 18 days
Aggregate Intrinsic Value	$ 206,521	$ 148,389

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax provision	$ 16,747	$ 334	$ 17,954	$ 1,935
Effective tax rate	(99.90%)	(4.20%)	(22.30%)	(3.50%)
Discrete tax expense associated with IP transfer	$ 17,100		$ 17,100
Current tax expense for the accrual of an uncertain tax position	20,800		20,800
Deferred tax benefit related to the reversal of the acquired intangible asset deferred tax liability	3,700		3,700
Uncertain tax position	$ 21,000		$ 21,000		$ 1,200

Net Loss Per Share - Basic and

Net Loss Per Share - Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net loss	$ (33,513)	$ (30,760)	$ (34,252)	$ (8,286)	$ (20,406)	$ (28,196)	$ (98,525)	$ (56,888)
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	46,584			42,064			45,433	40,294
Net loss per share, basic and diluted (in dollars per share)	$ (0.72)			$ (0.20)			$ (2.17)	$ (1.41)

Net Loss Per Share - Securities

Net Loss Per Share - Securities Excluded from Diluted Net Loss Per Share (Details) - shares shares in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded from computation of diluted net loss per share (in shares)	3,596	6,503
Unvested early exercised common shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded from computation of diluted net loss per share (in shares)	0	71
Unvested restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded from computation of diluted net loss per share (in shares)	5,446	5,014
Employee Stock Purchase Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded from computation of diluted net loss per share (in shares)	172	148

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Jun. 30, 2019	Jun. 05, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Deferred revenue	$ 177,496	$ 177,496	$ 173,833		$ 172,031
Director
Related Party Transaction [Line Items]
Amounts receivable related to related party sales	2,200	2,200
Deferred revenue	700	700
Director | License
Related Party Transaction [Line Items]
Revenue from related party sales	1,500
PSUs | Director
Related Party Transaction [Line Items]
Grant date fair value				$ 2,100
Unrecognized compensation cost	$ 1,600	$ 1,600
Recognition period		2 years

Subsequent Events (Details)

Subsequent Events (Details) $ in Millions	Oct. 02, 2019USD ($)
Bullguard Israel Ltd. Asset Acquisition | Subsequent Event
Subsequent Event [Line Items]
Cash purchase price	$ 10.3