Mobileiron 10-Q 1 Nov 19 2019 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Oct. 28, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Entity Registrant Name	MobileIron, Inc.
Entity Central Index Key	0001470099
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Current Reporting Status	Yes
Entity Common Stock, Shares Outstanding		112,030,673
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Shell Company	false

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 94,553	$ 104,613
Short-term investments	1,897	1,000
Accounts receivable, net of allowance for doubtful accounts of $391 and $425 at September 30, 2019 and December 31, 2018, respectively	44,564	60,994
Deferred commissions - current	9,038	8,265
Prepaid expenses and other current assets	13,680	8,367
TOTAL CURRENT ASSETS	163,732	183,239
Property and equipment-net	5,529	7,046
Operating lease right-of-use asset	13,169
Deferred commissions - noncurrent	8,072	9,066
Goodwill	5,475	5,475
Other assets	5,954	5,561
TOTAL ASSETS	201,931	210,387
Current liabilities:
Accounts payable	2,775	2,154
Accrued expenses	20,452	27,347
Lease liabilities - current	5,820
Unearned revenue - current	76,913	74,177
Customer arrangements with termination rights	16,246	19,367
TOTAL CURRENT LIABILITIES	122,206	123,045
Long-term liabilities:
Lease liabilities - noncurrent	9,873
Unearned revenue - noncurrent	29,889	31,660
Other long-term liabilities	181	1,565
TOTAL LIABILITIES	162,149	156,270
Commitments and contingencies (Note 11)
Stockholders’ equity:
Common stock, $0.0001 par value, 300,000,000 shares authorized, 114,424,591 shares issued and 112,030,673 shares outstanding and 107,028,433 shares issued and 106,206,545 shares outstanding at September 30, 2019 and December 31, 2018, respectively	11	11
Additional paid-in capital	497,185	462,004
Treasury stock	(12,455)	(3,831)
Accumulated deficit	(444,959)	(404,067)
TOTAL STOCKHOLDERS’ EQUITY	39,782	54,117
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 201,931	$ 210,387

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Accounts receivable, allowance	$ 391,000	$ 425,000
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	114,424,591	107,028,433
Common stock, shares outstanding	112,030,673	106,206,545

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	$ 52,201	$ 49,251	$ 151,148	$ 139,069
Cost of revenue
Restructuring expense			300
Total cost of revenue	10,459	8,473	31,469	24,359
Gross profit	41,742	40,778	119,679	114,710
Operating expenses:
Research and development	19,072	18,465	60,889	58,072
Sales and marketing	23,577	22,867	74,099	70,869
General and administrative	6,932	6,806	22,477	21,080
Restructuring expense			2,758
Total operating expenses	49,581	48,138	160,223	150,021
Operating loss	(7,839)	(7,360)	(40,544)	(35,311)
Other income (expense) - net	35	181	987	479
Loss before income taxes	(7,804)	(7,179)	(39,557)	(34,832)
Income tax expense	399	319	1,335	1,043
Net loss	$ (8,203)	$ (7,498)	$ (40,892)	$ (35,875)
Net loss per share, basic and diluted (in dollars per share)	$ (0.07)	$ (0.07)	$ (0.37)	$ (0.35)
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	110,831	104,032	109,147	101,369
Cloud services
Revenue
Revenue	$ 17,591	$ 13,199	$ 49,163	$ 36,181
Cost of revenue
Cost of revenue	436	529	1,423	1,475
License
Revenue
Revenue	12,216	15,006	35,814	41,327
Cost of revenue
Cost of revenue	5,557	3,331	15,413	8,624
Software support and services
Revenue
Revenue	22,394	21,046	66,171	61,561
Cost of revenue
Cost of revenue	$ 4,466	$ 4,613	$ 14,333	$ 14,260

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Deficit	Total
BALANCE at Dec. 31, 2017	$ 10	$ 420,525		$ (360,983)	$ 59,552
BALANCE (in shares) at Dec. 31, 2017	97,203,950
Issuance of common stock for stock option exercises		5,909			5,909
Issuance of common stock for stock option exercises (in shares)	2,003,842
Issuance of common stock pursuant to the Employee Stock Purchase Plan		4,548			4,548
Issuance of common stock pursuant to the Employee Stock Purchase Plan (in shares)	1,597,778
Issuance of common stock pursuant to the Employee Stock-Settled Bonus Plans	$ 1	9,621			9,622
Issuance of common stock pursuant to the Employee Stock-Settled Bonus Plans (in shares)	1,973,386
Shares withheld for net settlement of equity awards		(5,294)			(5,294)
Shares withheld for net settlement of equity awards (in shares)	(1,072,919)
Vesting of restricted stock units (in shares)	3,714,451
Stock-based compensation		20,035			20,035
Net loss				(35,875)	(35,875)
BALANCE at Sep. 30, 2018	$ 11	455,344		(396,858)	58,497
BALANCE (in shares) at Sep. 30, 2018	105,420,488
BALANCE at Jun. 30, 2018	$ 11	442,794		(389,360)	53,445
BALANCE (in shares) at Jun. 30, 2018	102,454,185
Issuance of common stock for stock option exercises		4,500			4,500
Issuance of common stock for stock option exercises (in shares)	1,338,978
Issuance of common stock pursuant to the Employee Stock Purchase Plan		2,209			2,209
Issuance of common stock pursuant to the Employee Stock Purchase Plan (in shares)	768,596
Shares withheld for net settlement of equity awards		(1,570)			(1,570)
Shares withheld for net settlement of equity awards (in shares)	(320,355)
Vesting of restricted stock units (in shares)	1,179,084
Stock-based compensation		7,411			7,411
Net loss				(7,498)	(7,498)
BALANCE at Sep. 30, 2018	$ 11	455,344		(396,858)	58,497
BALANCE (in shares) at Sep. 30, 2018	105,420,488
BALANCE at Dec. 31, 2018	$ 11	462,004	$ (3,831)	(404,067)	54,117
BALANCE (in shares) at Dec. 31, 2018	106,206,545
Issuance of common stock for stock option exercises		5,481			$ 5,481
Issuance of common stock for stock option exercises (in shares)	1,337,433				1,337,433
Issuance of common stock pursuant to the Employee Stock Purchase Plan		4,132			$ 4,132
Issuance of common stock pursuant to the Employee Stock Purchase Plan (in shares)	1,048,302
Issuance of common stock pursuant to the Employee Stock-Settled Bonus Plans		10,485			10,485
Issuance of common stock pursuant to the Employee Stock-Settled Bonus Plans (in shares)	2,170,855
Shares withheld for net settlement of equity awards		(5,492)			(5,492)
Shares withheld for net settlement of equity awards (in shares)	(1,064,577)
Repurchase of common stock			(8,624)		$ (8,624)
Repurchase of common stock (in shares)	(1,572,030)				(1,572,030)
Vesting of restricted stock units (in shares)	3,904,145
Stock-based compensation		20,575			$ 20,575
Net loss				(40,892)	(40,892)
BALANCE at Sep. 30, 2019	$ 11	497,185	(12,455)	(444,959)	39,782
BALANCE (in shares) at Sep. 30, 2019	112,030,673
BALANCE at Jun. 30, 2019	$ 11	484,593	(10,422)	(436,756)	37,426
BALANCE (in shares) at Jun. 30, 2019	109,770,021
Issuance of common stock for stock option exercises		3,761			3,761
Issuance of common stock for stock option exercises (in shares)	780,029
Issuance of common stock pursuant to the Employee Stock Purchase Plan		2,085			2,085
Issuance of common stock pursuant to the Employee Stock Purchase Plan (in shares)	530,190
Shares withheld for net settlement of equity awards		(707)			(707)
Shares withheld for net settlement of equity awards (in shares)	(102,535)
Repurchase of common stock			(2,033)		$ (2,033)
Repurchase of common stock (in shares)	(290,844)				(290,844)
Vesting of restricted stock units (in shares)	1,343,812
Stock-based compensation		7,453			$ 7,453
Net loss				(8,203)	(8,203)
BALANCE at Sep. 30, 2019	$ 11	$ 497,185	$ (12,455)	$ (444,959)	$ 39,782
BALANCE (in shares) at Sep. 30, 2019	112,030,673

CONDENSED CONSOLIDATED STATEM_3

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	$ (40,892)	$ (35,875)
Adjustments to reconcile net loss to net cash provided by operating activities:
Stock-based compensation expense	27,159	28,493
Depreciation	2,587	2,856
Amortization of intangible assets		100
Accretion of premium on investment securities	(21)	(47)
Impairment of right-of-use assets	1,328
Provision for doubtful accounts		80
Loss on disposal of fixed assets	170	41
Changes in operating assets and liabilities:
Accounts receivable	16,429	698
Deferred commissions	220	1,417
Other current and noncurrent assets	(2,372)	(4,499)
Accounts payable	637	68
Unearned revenue	964	15,952
Customer arrangements with termination rights	(3,121)	(3,041)
Accrued expenses and other long-term liabilities	(5,504)	852
Net cash provided by (used in) operating activities	(2,416)	7,095
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	(1,233)	(1,380)
Proceeds from maturities of investment securities	3,250	12,800
Purchase of investment securities	(4,126)	(9,053)
Net cash provided by (used in) investing activities	(2,109)	2,367
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from Employee Stock Purchase Plan	3,100	3,281
Taxes paid for net settlement of equity awards	(5,492)	(3,942)
Proceeds from exercise of stock options	5,481	5,909
Amounts withheld for net settlement of equity awards		(1,352)
Repurchase of common stock	(8,624)
Net cash provided by (used in) financing activities	(5,535)	3,896
NET CHANGE IN CASH AND CASH EQUIVALENTS	(10,060)	13,358
CASH AND CASH EQUIVALENTS-Beginning of period	104,613	85,833
CASH AND CASH EQUIVALENTS-End of period	94,553	99,191
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for income taxes	1,280	1,029
Lease payments included in cash provided by operating activities	5,540	5,406
SUPPLEMENTAL DISCLOSURES OF NONCASH FINANCING ACTIVITIES:
Value of shares issued under the Bonus Plans	6,374	5,898
Value of shares issued under the Employee Stock Purchase Plan	4,132	4,548
Unpaid property and equipment purchases	$ 155	$ 186

Description of Business and Sig

Description of Business and Significant Accounting Policies	9 Months Ended
	Sep. 30, 2019
Description of Business and Significant Accounting Policies
Description of Business and Significant Accounting Policies	1. Description of Business MobileIron, Inc. and its wholly owned subsidiaries, collectively, the “Company”, “we”, “us” or “our”, provides a purpose-built mobile IT platform that enables enterprises to manage and secure mobile applications, content and devices while providing their employees with device choice, privacy and a native user experience. We were incorporated in Delaware in July 2007 and are headquartered in Mountain View, California, with additional sales and support presence in North America, Europe, the Middle East, Asia and Australia and employees in India primarily focused on research and development. Basis of Presentation and Consolidation The accompanying unaudited condensed consolidated financial statements as of September30, 2019 and for the three and nine months ended September 30, 2019 and 2018 have been prepared in accordance with U.S. generally accepted accounting principles, or GAAP, for interim financial statements and pursuant to the rules and regulations of the SEC, and include the accounts of our wholly owned subsidiaries. Intercompany accounts and transactions have been eliminated in consolidation. Certain information and footnote disclosures in this Quarterly Report on Form 10-Q normally included in annual financial statements prepared in accordance with U.S. GAAP and pursuant to the rules and regulations of the SEC have been condensed or omitted pursuant to such rules and regulations. In the opinion of management, the unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary for a fair presentation of our balance sheet as of September 30, 2019, our operating results for the three and nine months ended September 30, 2019 and 2018, and our cash flows for the nine months ended September 30, 2019 and 2018. Our operating results for the three and nine months ended September 30, 2019 are not necessarily indicative of the results that may be expected for the fiscal year ending December 31, 2019. The condensed consolidated balance sheet as of December 31, 2018 has been derived from the audited consolidated financial statements as of that date, but does not include all the footnotes required by U.S. GAAP for complete financial statements. The accompanying unaudited condensed consolidated financial statements and related financial information should be read in conjunction with our audited financial statements and related notes for the year ended December 31, 2018, included in our Annual Report on Form 10-K for the year ended December 31, 2018 previously filed with the SEC. Foreign Currency Translation Our reporting currency is the U.S. dollar. The functional currency of all our international operations is the U.S. dollar. All monetary asset and liability accounts are translated into U.S. dollars at the period-end rate, nonmonetary assets and liabilities are translated at historical exchange rates, and revenue and expenses are translated at the weighted-average exchange rates in effect during the period. Translation adjustments are recorded as foreign currency gains (losses) in the condensed consolidated statements of operations. We recognized a foreign currency loss of $420,000 and $217,000 in the three months ended September 30, 2019 and 2018, respectively, and $612,000 and $571,000 in the nine months ended September 30, 2019 and 2018, respectively, in other income (expense)—net in our condensed consolidated statements of operations. Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. These estimates include, but are not limited to, revenue recognition, deferred commissions and commissions expense, stock-based compensation, goodwill, and accounting for income taxes. Actual results could differ from those estimates. Concentrations of Credit Risk Financial instruments that potentially subject us to a concentration of credit risk consist of cash, money market funds and fixed income investments. Although we deposit our cash with multiple financial institutions, our deposits, at times, exceed federally insured limits. We invest in fixed income securities that are of high-credit quality. Substantially all of our money market funds, or $43.9 million, are held in five funds that are rated “AAA.” We generally do not require collateral or other security in support of accounts receivable. Allowances are provided for individual accounts receivable when we become aware of a customer’s inability to meet its financial obligations, such as in the case of bankruptcy, deterioration of the customer’s operating results, or change in financial position. If circumstances related to customers change, estimates of the recoverability of receivables would be further adjusted. We also consider broader factors in evaluating the sufficiency of our allowances for doubtful accounts, including the length of time receivables are past due, significant one-time events and historical experience. At September 30, 2019 and December 31, 2018, we had an allowance for doubtful accounts of $391,000 and $425,000, respectively. One reseller accounted for 10% of total revenue for both the three and nine months ended September 30, 2019, and for 11% of total revenue for both the three and nine months ended September 30, 2018, respectively. No other resellers or end-user customers accounted for 10% or more of our total revenue for any period presented. One reseller accounted for 11% of our net accounts receivable at September 30, 2019. No other reseller or end-user customer accounted for 10% or more of net accounts receivable at December 31, 2018. Segments We have one reportable segment, software and services to manage and secure mobile devices, applications and content. Summary of Significant Accounting Policies Revenue Recognition Revenue Presentation Cloud services include sales of cloud-based solutions that allow customers to use hosted software over a contract period without taking possession of our software and are typically provided on a subscription or usage basis. License revenue includes sales of perpetual software licenses, software licenses sold as part of on-premise term subscriptions, and appliances. Software support and services revenue includes sales of software support sold as part of on-premise term subscriptions, software support for perpetual licenses, and professional services. Revenue Recognition Revenue is recognized upon transfer of control of promised products or services to customers in an amount that reflects the consideration we expect to receive in exchange for those products or services. We enter into contracts that can include various combinations of products and services, which are generally capable of being distinct and accounted for as separate performance obligations. Revenue is recognized net of allowances for returns and any taxes collected from customers, which are subsequently remitted to governmental authorities. Nature of Products and Services Cloud services, which allow customers to use hosted software over a contract period without taking possession of our software, are provided on a subscription or usage basis. Revenue related to cloud services provided on a subscription basis is recognized ratably over the contract period and revenue related to cloud services based on usage is generally recognized as the usage occurs. Licenses for on-premise software provide the customer with a right to use the software as it exists when made available to the customer. Customers may purchase on-premise software licenses as perpetual licenses or as part of subscriptions. On-premise licenses are considered distinct performance obligations and revenue from the licenses is recognized upfront when the software is made available to the customer. In the case of our on-premise subscriptions, the license portion of revenue is recognized up-front, and the software support and services portion is recognized ratably. Software support and services convey rights to the upgrades released over the contract period and provide support and tools to help customers deploy and use our products more efficiently. Revenue allocated to software support and services is generally recognized ratably over the contract period as customers simultaneously consume and receive benefits, given that the software support and services comprises a distinct performance obligation that is satisfied over time. On-premise subscriptions and software support and services occasionally contain termination rights. We recognize revenue from those arrangements, including the distinct licenses contained therein, as the termination rights for the performance obligation expire. See also Unearned Revenue and Customer Arrangements with Termination Rights below. Professional services include consulting, deployment and training services. Our professional services represent distinct performance obligations as our customers benefit from the services separately or together with other readily available resources. Professional services revenue is recognized as services are delivered. Appliance revenue was less than 5% of total revenue for all periods presented and is included as a component of license revenue within the consolidated statements of operations. Refer to Note 14 – Segment and Disaggregation of Revenue Information for further information. Significant Judgments Our contracts with customers often include promises to transfer multiple products and services to a customer. Determining whether products and services are considered distinct performance obligations that should be accounted for separately versus together may require significant judgment. Judgment is required to determine whether a software license is considered distinct and accounted for separately, or not distinct and accounted for together with the software support and services and recognized over time. Judgment is required to determine the standalone selling price (“SSP”) for each distinct performance obligation. We use a range of amounts to estimate the SSP for items that are not sold separately, including on-premises licenses sold with software support and services. In instances where SSP is not directly observable, such as when we do not sell the product or service separately, we determine the SSP using information that may include other observable inputs. We typically have more than one SSP for individual products and services due to the stratification of those products and services by customer classes and circumstances. In these instances, we may use information such as the size and type of customer in determining the SSP. Contract Balances Timing of revenue recognition may differ from the timing of invoicing customers. We record a receivable when revenue is recognized prior to invoicing, or unearned revenue when revenue will be recognized after invoicing. For multi-year agreements, we either invoice our customer in full at the inception of the contract or annually at the beginning of each annual period. We record an unbilled receivable related to revenue recognized for multi-year on-premise licenses invoiced annually when we have an unconditional right to invoice and receive payment in the future for those licenses or when we have the right to invoice future monthly periods under committed monthly recurring charge (“MRC”) agreements. The majority of our MRC agreements are for a month to month term (“non-committed”) or usage-based. Payment terms and conditions vary by contract type, although terms generally include a requirement to pay within 30 to 60 days. In instances where the timing of revenue recognition differs from the timing of invoicing, we have determined our contracts generally do not include a significant financing component. The primary purpose of our invoicing terms is to provide customers with simplified and predictable ways of purchasing our products and services, not to receive financing from our customers or to provide customers with financing. This includes invoicing at the beginning of a subscription term with revenue recognized ratably over the contract period or multi-year on-premise licenses that are invoiced annually with a portion of the revenue recognized upfront. As of September 30, 2019 and December 31, 2018, the balance of accounts receivable, net of the allowance for doubtful accounts, included $2.2 million and $1.4 million, respectively, of unbilled receivables from upfront recognition of revenue for certain multi-period on-premises software subscriptions that include both distinct software licenses and software support and services. As of September 30, 2019 and December 31, 2018, unbilled receivables included in other long-term assets on our consolidated balance sheets were $858,000 and $592,000, respectively. Unearned Revenue and Customer Arrangements with Termination Rights We generally invoice our customers upfront for subscriptions and software support and services associated with perpetual licenses. Unearned revenue from those upfront billings is comprised of unearned revenue from cloud-based subscriptions, software support and services for on-premise subscriptions, software support and services associated with perpetual licenses and professional services to be performed in the future. Because some of our arrangements with customers contain termination rights, the arrangements do not meet the definition of a contract under Accounting Standard Codification, or ASC, Topic 606, Revenue Recognition from Contracts with Customers, or ASC 606, and are not recorded as unearned revenue and instead are recorded as “customer arrangements with termination rights” on our consolidated balance sheets. Refer to Note 13 – Unearned Revenue for further information on unearned revenue, changes in unearned revenue during the period, and customer arrangements with termination rights. Deferred Commissions We recognize an asset for the incremental costs of obtaining a contract with a customer. We have determined that certain sales incentive programs meet the requirements to be capitalized and we include those costs in current and non-current deferred commissions on our consolidated balance sheets. Deferred commissions are amortized over the period commensurate with revenue recognition. Changes in deferred commissions were as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Balance, beginning of the period $ 17,727 $ 16,928 $ 17,331 $ 18,408 Deferral of commissions earned 4,271 4,158 12,862 10,953 Recognition of commission expense (4,867) (4,095) (12,844) (12,370) Impairment of deferred commissions (21) — (239) — Balance, end of the period $ 17,110 $ 16,991 $ 17,110 $ 16,991 Cash Equivalents We consider all highly liquid investments with an original maturity of three months or less to be cash equivalents. As of September 30, 2019 and December 31, 2018, cash and cash equivalents consist of cash deposited with banks, money market funds and investments that mature within three months of their purchase. Held-To-Maturity Investments We determine the appropriate classification of our fixed income investments at the time of purchase and reevaluate their classifications each reporting period. Investments are classified as held-to-maturity since the Company has positive intent and the ability to hold the securities to maturity. Held-to-maturity securities are stated at amortized cost. Comprehensive Loss Comprehensive loss includes all changes in equity (net assets) during a period from non-owner sources. For the three and nine months ended September 30, 2019 and 2018, there were no differences between net loss and comprehensive loss. Therefore, the consolidated statements of comprehensive loss have been omitted. Net Loss per Share of Common Stock Basic net loss per common share is calculated by dividing the net loss by the weighted-average number of common shares outstanding during the period after repurchases but without consideration for potentially dilutive securities. Diluted net loss per share is computed by dividing the net loss by the weighted-average number of common shares and potentially dilutive securities outstanding for the period determined using the treasury-stock and if-converted methods. For purposes of the diluted net loss per share calculation, unvested restricted stock and stock options are considered to be potentially dilutive securities. Because we have reported a net loss for the three and nine months ended September 30, 2019 and 2018, the number of shares used to calculate diluted net loss per common share is the same as the number of shares used to calculate basic net loss per common share for those periods presented because the potentially dilutive shares would have been anti-dilutive if included in the calculation. Software Development Costs Incurred in Connection with Software to be Sold or Marketed The costs to develop new software products and enhancements to existing software products are expensed as incurred until technological feasibility has been established. We consider technological feasibility to have occurred when all planning, designing, coding and testing have been completed according to design specifications. Once technological feasibility is established, any additional costs would be capitalized. We believe our current process for developing software is essentially completed concurrent with the establishment of technological feasibility, and accordingly, no costs have been capitalized. Internal Use Software We capitalize costs incurred during the application development stage related to our internally used software. Such costs are primarily incurred by third-party vendors and consultants. Costs related to preliminary project activities and post-implementation activities are expensed as incurred. Amounts capitalized in all periods presented were not significant. All software development costs incurred in connection with our cloud offering, or SaaS, are also sold or marketed to partners or end customers, therefore we start capitalizing costs when technological feasibility is achieved. No costs were capitalized in any periods presented as we believe that our current process for developing software is essentially completed concurrent with the establishment of technological feasibility. Property and Equipment Property and equipment are stated at cost. Depreciation is computed using the straight-line method over the estimated useful life of the property and equipment, determined to be three years for computers and equipment and software, five years for furniture and fixtures, and the lesser of the remaining lease term or estimated useful life for leasehold improvements. Expenditures for repairs and software support are charged to expense as incurred. Upon disposition, the cost and related accumulated depreciation are removed from the accounts and the resulting gain or loss is reflected as operating expenses in the consolidated statements of operations. Leases T he new leasing standard, Accounting Standards Codification 842, “Leases”, or ASC 842, requires us to record current and noncurrent lease liabilities and a right-of-use (“ROU”) asset on our condensed consolidated balance sheet for contractual arrangements that convey the right to control the use of identified property, plant, or equipment for a period of time in exchange for consideration . We adopted ASC 842 as of January 1, 2019 and, as permitted, we recorded lease liabilities and a ROU asset beginning March 31, 2019 and did not restate our prior periods. We determine if an arrangement is a lease conveying the right to control identified property, plant, or equipment and whether the lease is operating or financing at the lease’s inception. We have determined that all of our leases are operating 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 under the lease arrangements. Operating lease ROU assets and liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. As our leases do not provide an implicit interest rate, we use our incremental borrowing rate based on the information available at the lease commencement date to determine the present value of lease payments. The operating lease ROU asset also includes any advance lease payments made and excludes lease incentives. 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 is recognized on a straight-line basis over the lease term. We have adopted the practical expedient as permitted by the new leasing standard to not recognize lease assets and lease liabilities for leases with a term of 12 months or less. Our leases generally separate lease components from nonlease components. However, where lease and nonlease components are combined in our lease arrangements, we have adopted the practical expedient to not separate the lease from the nonlease components. Refer to Note 12 - Leases for further information about our leases. Goodwill We record the excess of the acquisition purchase price over the fair value of the tangible and identifiable intangible assets acquired as goodwill. We perform an impairment test of our goodwill in the third quarter of our fiscal year, or more frequently if indicators of potential impairment arise. We have a single reporting unit and consequently evaluate goodwill for impairment based on an evaluation of the fair value of the Company as a whole. Long-Lived Assets with Finite Lives Long-lived assets are reviewed for possible impairment whenever events or circumstances indicate that the carrying amount of these assets may not be recoverable. We evaluate the recoverability of each of our long-lived assets, including property and equipment, by comparison of its carrying amount to the future discounted cash flows we expect the asset to generate. If we consider the asset to be impaired, we measure the amount of any impairment as the difference between the carrying amount and the fair value of the impaired asset. Stock-Based Compensation We use the estimated grant-date fair value method of accounting in accordance with ASC Topic 718 Compensation—Stock Compensation . Fair value is determined using the Black-Scholes Model using various inputs, including our estimates of expected volatility, term and future dividends. We estimated the forfeiture rate based on our historical experience for annual grant years where the majority of the vesting terms have been satisfied. We recognize compensation costs for awards with service and performance vesting conditions and for our Employee Stock Purchase Plan, or ESPP, on an accelerated method over the requisite service period of the award. For stock options or restricted stock unit grants with no performance condition, we recognize compensation costs on a straight-line basis over the requisite service period of the award, which is generally the vesting term of four years. Research and Development Because we estimate that our software is essentially completed concurrent with the establishment of technological feasibility, we have charged all research and development to expense as incurred. Advertising Advertising costs are expensed and included in sales and marketing expense when incurred. Advertising expense for the three and nine months ended September 30, 2019 and 2018 was not significant. Income Taxes We account for income taxes in accordance with ASC Topic 740, Income Taxes , under which deferred tax liabilities and assets are recognized for the expected future tax consequences of temporary differences between financial statement carrying amounts and the tax basis of assets and liabilities and net operating loss and tax credit carryforwards. Valuation allowances are established when necessary to reduce deferred tax assets to the amount expected to be realized. We use a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. A tax position is recognized when it is more likely than not that the tax position will be sustained upon examination, including resolution of any related appeals or litigation processes. A tax position that meets the more-likely-than-not recognition threshold is measured at the largest amount of benefit that is greater than 50% likely of being realized upon ultimate settlement with a taxing authority. The standard also provides guidance on derecognition of tax benefits, classification on the balance sheet, interest and penalties, accounting in interim periods, disclosure and transition. Recent Accounting Pronouncements From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board, or FASB, or other standard setting bodies and adopted by us as of the specified effective date. Unless otherwise discussed, the impact of recently issued standards that are not yet effective will not have a material impact on our financial position or results of operations upon adoption. Financial Instruments – Credit Losses In June 2016, the FASB issued Accounting Standards Update (“ASU”) No. 2016-13, Financial Instruments – Credit Losses – Measurement of Credit Losses on Financial Instruments, which introduces a model based on expected losses to estimate credit losses for most financial assets and certain other instruments. In addition, for available-for-sale debt securities with unrealized losses, the losses will be recognized as allowances rather than reductions in the amortized cost of the securities. The standard is effective for annual reporting periods beginning after December 15, 2019, with early adoption permitted for annual reporting periods beginning after December 15, 2018. Entities will apply the standard’s provisions by recording a cumulative-effect adjustment to retained earnings. We are evaluating the impact of the adoption on our consolidated balance sheet, results of operations, cash flows and disclosures . We intend to adopt ASU No. 2016-13 effective January 1, 2020. Simplifying the Test for Goodwill Impairment In January 2017, the FASB issued ASU 2017-04, “Simplifying the Test for Goodwill Impairment.” This ASU simplifies the subsequent measurement of goodwill by eliminating Step 2 from the goodwill impairment test. The annual, or interim, goodwill impairment test is performed by comparing the fair value of a reporting unit with its carrying amount. An impairment charge should be recognized for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. In addition, income tax effects from any tax-deductible goodwill on the carrying amount of the reporting unit should be considered when measuring the goodwill impairment loss, if applicable. This ASU should be applied on a prospective basis. The ASU is effective for annual and interim reporting periods beginning after December 15, 2021. Early adoption is permitted. We do not expect the adoption of this ASU to have a material impact on our consolidated financial position, results of operations, or cash flows.

Significant Balance Sheet Compo

Significant Balance Sheet Components	9 Months Ended
	Sep. 30, 2019
Significant Balance Sheet Components
Significant Balance Sheet Components	2. Significant Balance Sheet Components Accounts Receivable, Net —Accounts receivable, net at September 30, 2019 and December 31, 2018 consisted of the following (in thousands): September 30, 2019 December 31, 2018 Accounts receivable - billed $ 42,749 $ 60,037 Accounts receivable - unbilled 2,206 1,382 Allowance for doubtful accounts (391) (425) Accounts receivable, net $ 44,564 $ 60,994 Property and Equipment —Property and equipment at September 30, 2019 and December 31, 2018 consisted of the following (in thousands): September 30, 2019 December 31, 2018 Computers and appliances $ 14,218 $ 13,517 Purchased software 4,886 4,711 Furniture and fixtures 1,799 1,695 Leasehold improvements 3,400 3,503 Total property and equipment 24,303 23,426 Accumulated depreciation and amortization (18,774) (16,380) Total property and equipment—net $ 5,529 $ 7,046 Prepaid expenses and other current assets at September 30, 2019 and December 31, 2018 included $7.8 million and $3.8 million of prepaid royalties, respectively. Other assets at September 30, 2019 and December 31, 2018 included $3.3 million and $3.4 million of prepaid royalties, respectively. The prepaid royalties were primarily associated with MobileIron Threat Defense. Accrued Expenses —Accrued expenses at September 30, 2019 and December 31, 2018 consisted of the following (in thousands): September 30, 2019 December 31, 2018 Accrued commissions $ 4,567 $ 4,398 Accrued stock-settled bonus 5,454 9,355 Employee Stock Purchase Plan liability 890 1,923 Other accrued payroll-related expenses 3,113 3,630 Accrued royalties 2,091 3,596 Other accrued liabilities 4,337 4,445 Total accrued expenses $ 20,452 $ 27,347

Fair Value Measurement

Fair Value Measurement	9 Months Ended
	Sep. 30, 2019
Fair Value Measurement
Fair Value Measurement	3. With the exception of our held-to-maturity fixed income investments, we report financial assets and liabilities and nonfinancial assets and liabilities that are recognized or disclosed at fair value in the consolidated financial statements on a recurring basis in accordance with ASC 820, Fair Value Measurements. ASC 820 defines fair value as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities, which are required to be recorded at fair value, we consider the principal or most advantageous market in which we would transact and the market-based risk measurements or assumptions that market participants would use in pricing the asset or liability, such as inherent risk, transfer restrictions and credit risk. ASC 820 also establishes a fair value hierarchy, which prioritizes the inputs to valuation techniques used to measure fair value into three levels. A financial instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is available and significant to the fair value measurement. ASC 820 establishes and prioritizes three levels of inputs 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 other than quoted prices that are observable for the assets or liabilities, either directly or indirectly through market corroboration, for substantially the full term of the financial instruments. — Level 3—Inputs are unobservable inputs based on our own assumptions used to measure assets and liabilities at fair value. The inputs require significant management judgment or estimation. Our financial assets that are carried at fair value include cash and money market funds. We had no financial liabilities, or nonfinancial assets and liabilities that were required to be measured at fair value on a recurring basis, or that were measured at fair value as of September 30, 2019 or December 31, 2018. Our financial instruments measured at fair value as of September 30, 2019 and December 31, 2018 were as follows: As of September 30, 2019 (in thousands) Level 1 Level 2 Level 3 Total Money market funds $ 43,930 $ — $ — $ 43,930 Corporate debt securities — 930 — 930 U.S. treasuries — 3,897 — 3,897 Commercial paper — 36,191 — 36,191 Total $ 43,930 $ 41,018 $ — $ 84,948 As of December 31, 2018 (in thousands) Level 1 Level 2 Level 3 Total Money market funds $ 36,617 $ — $ — $ 36,617 Corporate debt securities — 6,555 — 6,555 Commercial paper — 53,598 — 53,598 Total $ 36,617 $ 60,153 $ — $ 96,770

Investments

Investments	9 Months Ended
	Sep. 30, 2019
Investments
Investments	4. Investments Our portfolio of fixed income securities consists of commercial paper, corporate debt securities, and U.S. government agencies. All our investments in fixed income securities are classified as held-to-maturity. These investments are carried at amortized cost. Our investments in fixed income securities as of September 30, 2019 and December 31, 2018 were as follows: As of September 30, 2019 Amortized Fair (in thousands) Cost Gains Losses Value Corporate debt securities $ 930 $ — $ — $ 930 U.S. treasuries 3,897 — — 3,897 Commercial paper 36,193 — (2) 36,191 Total $ 41,020 $ — $ (2) $ 41,018 As of December 31, 2018 Amortized Fair (in thousands) Cost Gains Losses Value Corporate debt securities $ 6,556 $ — $ (1) $ 6,555 Commercial paper 53,600 1 (3) 53,598 Total $ 60,156 $ 1 $ (4) $ 60,153 The following table summarizes the balance sheet classification of our investments: As of September 30, As of December 31, (in thousands) 2019 2018 Cash equivalents $ 39,123 $ 59,156 Short-term investments 1,897 1,000 Total investments $ 41,020 $ 60,156 The gross amortized cost and estimated fair value of our held-to-maturity investments by contractual maturity are shown below. Actual maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties. As of September 30, 2019 As of December 31, 2018 Gross Gross Amortized Fair Amortized Fair (in thousands) Cost Value Cost Value Due in one year or less $ 41,020 $ 41,018 $ 60,156 $ 60,153 Due after one year through five years — — — — Total $ 41,020 $ 41,018 $ 60,156 $ 60,153 We monitor our investment portfolio for impairment on a periodic basis. In order to determine whether a decline in fair value is other-than-temporary, we evaluate, among other factors: the duration and extent to which the fair value has been less than the carrying value; our financial condition and business outlook, including key operational and cash flow metrics, current market conditions and future trends in our industry; our relative competitive position within the industry; and our intent and ability to retain the investment for a period of time sufficient to allow for any anticipated recovery in fair value. A decline in the fair value of the security below amortized cost that is deemed other-than-temporary is charged to earnings, resulting in the establishment of a new cost basis for the affected securities. In the three and nine months ended September 30, 2019, we had an insignificant amount of unrealized gains or losses, and we did not recognize any other-than-temporary impairments .

Restructuring Expense

Restructuring Expense	9 Months Ended
	Sep. 30, 2019
Restructuring Expense
Restructuring Expense	5. Restructuring Expense We initiated a restructuring plan in the first quarter of 2019 under which we have terminated certain employees and exited an office facility. The restructuring plan was undertaken to better align resources with company initiatives and to reduce management and other costs. The following table summarizes the activity in accrued restructuring expense, included in accrued expenses, for the three and nine months ended September 30, 2019 (in thousands): Severance and Other Restructuring Costs Three Months Ended Nine Months Ended September 30, 2019 Accrued restructuring, beginning of the period $ 1,047 $ — Provision for restructuring expense — 1,561 Cash payments (441) (955) Accrued restructuring, end of the period $ 606 $ 606 We expect to pay the remaining $606,000 of accrued restructuring expense through June 30, 2020. In connection with the exit of an office facility, we recorded a $1.3 million charge for the impairment of right-of-use assets and $170,000 of expense for the write-off of fixed assets in restructuring expense in the nine months ended September 30, 2019.

Line of Credit

Line of Credit	9 Months Ended
	Sep. 30, 2019
Line of Credit
Line of Credit	6. Line of Credit We have a $20.0 million revolving line of credit with a financial institution that can be used to (a) borrow for working capital and general business requirements, (b) issue letters of credit, and (c) enter into foreign exchange contracts. Amounts borrowed accrue interest at a floating per annum rate equal to the prime rate. A default interest rate shall apply during an event of default at a rate per annum equal to 5% above the otherwise applicable interest rate. The line of credit is collateralized by substantially all of our assets, except intellectual property, and requires us to comply with working capital, net worth and other covenants, including limitations on indebtedness and restrictions on dividend distributions, among others, but does allow for the repurchase of a limited amount of our common stock as contemplated by a share repurchase program approved by the Board of Directors (the “Board”) in October 2018, and the borrowing capacity is limited to eligible accounts receivable. We are required to maintain an adjusted quick ratio (defined as the ratio of current assets to current liabilities minus deferred revenue) of at least 1.25. In May 2015, we issued a letter of credit for $1.5 million as a security deposit for a new lease for office space in a building in Mountain View, California, and in November 2017 we issued a bank guarantee to a customer of approximately $3.0 million that can be drawn if we become insolvent or bankrupt. The issuances of the letter of credit and bank guarantee reduced the borrowing capacity under our line of credit to approximately $15.5 million. In June 2019, we amended our revolving line of credit and extended its maturity date to June 2020. There were no other outstanding amounts under the line of credit at September 30, 2019 or December 31, 2018 and we were in compliance with all financial covenants.

Preferred Stock

Preferred Stock	9 Months Ended
	Sep. 30, 2019
Preferred Stock
Preferred Stock	7. Preferred Stock We were authorized to issue up to 10,000,000 shares of convertible preferred stock as of September 30, 2019 and December 31, 2018. No shares of convertible preferred stock were issued and outstanding as of September 30, 2019 or December 31, 2018.

Common Stock

Common Stock	9 Months Ended
	Sep. 30, 2019
Common Stock
Common Stock	8. Common Stock We were authorized to issue 300,000,000 shares of common stock with a par value of $0.0001 per share as of September 30, 2019 and December 31, 2018. Each share of common stock is entitled to one vote. The holders of common stock are also entitled to receive dividends out of funds legally available therefore, when and if declared by the board of directors, subject to the approval and priority rights of holders of all classes of preferred stock outstanding. As of September 30, 2019 and December 31, 2018, our shares of common stock reserved for issuance were as follows: September 30, December 31, 2019 2018 Options outstanding 2,929,095 4,496,557 Unvested restricted stock units outstanding 13,806,088 12,303,913 Shares available for grant under the 2014 Equity Incentive Plan and 2015 Inducement Plan 1,365,303 2,337,545 Shares available for purchase under the Employee Stock Purchase Plan 378,525 364,762 Total 18,479,011 19,502,777 Repurchase Program In October 2018, our Board of Directors approved a common stock repurchase program (“Repurchase Program”) whereby the Company is authorized to purchase up to a maximum of $25 million of its common stock, subject to compliance with applicable law and the limitations in the Company’s credit facilities on stock repurchases. The authorization allows repurchases from time to time in the open market or in privately negotiated transactions. The amount and timing of repurchases made under the Repurchase Program will depend on a variety of factors, including available liquidity, cash flow and market conditions. Shares can be purchased through the Repurchase Program through October 2020, unless extended or shortened by our Board of Directors. The Repurchase Program does not obligate us to acquire any particular amount of common stock and the program may be modified or suspended at any time at our discretion. The repurchases would be funded from available working capital and are subject to compliance with the terms and limitations of the Company’s credit facilities. In the three months ended September 30, 2019, we repurchased 290,844 shares of common stock at an average price of $6.99 per share for a total cost of $2.0 million under the Repurchase Program. In the nine months ended September 30, 2019, we repurchased 1,572,030 shares of common stock at an average price of $5.49 per share for a total cost of $8.6 million under the Repurchase Program. The maximum remaining dollar value of shares yet to be purchased under the Repurchase Program was $12.5 million at September 30, 2019. This excludes shares repurchased to settle employee tax withholding related to the vesting of our stock-settled bonus and RSUs .

Share Based Awards

Share Based Awards	9 Months Ended
	Sep. 30, 2019
Share Based Awards
Share Based Awards	9. Share Based Awards 2008 Stock Plan Our 2008 Stock Plan, or 2008 Plan, which expired on June 12, 2014, provided for the grant of incentive and nonstatutory stock options to employees, nonemployee directors and consultants of the Company. Options granted under the 2008 Plan generally become exercisable within three to four years following the date of grant and expire 10 years from the date of grant. Our 2008 Plan was terminated following the date our 2014 Equity Incentive Plan, or our 2014 Plan, became effective. Any outstanding stock awards under our 2008 Plan will continue to be governed by the terms of our 2008 Plan and applicable award agreements. 2014 Equity Incentive Plan Our 2014 Plan provides for the grant of incentive stock options, or ISOs, within the meaning of Section 422 of the Internal Revenue Code, or the Code, to our employees and our parent and subsidiary corporations’ employees, and for the grant of nonstatutory stock options, or NSOs, stock appreciation rights, restricted stock awards, restricted stock unit awards, performance-based stock awards, and other forms of equity compensation to our employees, directors and consultants. Additionally, our 2014 Plan provides for the grant of performance cash awards to our employees, directors and consultants. The initial number of shares of our common stock available to be issued under our 2014 Plan was 8,142,857, which number of shares will be increased by any shares subject to stock options or other stock awards granted under the 2008 Stock Plan that would have otherwise returned to our 2008 Stock Plan (such as upon the expiration or termination of a stock award prior to vesting), not to exceed 16,312,202. The number of shares of our common stock reserved for issuance under our 2014 Plan automatically increase on January 1 of each year, beginning on January 1, 2015 and continuing through and including January 1, 2024, by 5% of the total number of shares of our capital stock outstanding on December 31 of the preceding calendar year, or a lesser number of shares determined by our board of directors. On January 1, 2019, we increased the number of shares of common stock reserved for issuance under our 2014 Plan by 5,310,327 shares, which was 5% of the total number of shares of common stock outstanding at December 31, 2018. Amended and Restated 2015 Inducement Plan On December 20, 2015, our board of directors adopted our 2015 Inducement Plan, or the Inducement Plan, to reserve 1,600,000 shares of our common stock to be used exclusively for grants of awards to individuals that were not previously employees or directors of the Company. The terms and conditions of the Inducement Plan are substantially similar to our stockholder-approved 2014 Plan. On January 5, 2016, our board of directors approved the amendment and restatement of the Inducement Plan to increase the share reserve under the Inducement Plan to 1,970,000 shares of our common stock. As of September 30, 2019, there were 778,125 stock options and restricted stock units outstanding under the Inducement Plan. 2014 Employee Stock Purchase Plan The purpose of our 2014 Employee Stock Purchase Plan, or ESPP, is to secure the services of new employees, to retain the services of existing employees and to provide incentives for such individuals to exert maximum efforts toward our success and that of our customers, other partners, and shareholders. Our ESPP is intended to qualify as an “employee stock purchase plan” within the meaning of Section 423 of the Code. Our ESPP permits eligible employees to purchase our common stock through payroll deductions, which may not exceed 15% of the employee’s base compensation. Stock may be purchased under the plan at a price equal to 85% of the fair market value of our common stock on either the first day of the offering or the last day of the applicable purchase period, whichever is lower. As of September 30, 2019 and December 31, 2018, approximately 378,525 and 364,762 shares of common stock were available for future issuance under our ESPP, respectively. The number of shares of our common stock reserved for issuance under our ESPP increase automatically each year, beginning on January 1, 2015 and continuing through and including January 1, 2024, by the lesser of (i) 1% of the total number of shares of our common stock outstanding on December 31 of the preceding calendar year; (ii) 2,142,857 shares of common stock; or (iii) such lesser number as determined by our board of directors. Shares subject to purchase rights granted under our ESPP that terminate without having been exercised in full will not reduce the number of shares available for issuance under our ESPP. On January 1, 2019, we increased the number of shares available for issuance under the ESPP by 1,062,065 shares, which was 1% of the total number of shares of our common stock outstanding as of December 31, 2018. Restricted Stock Units In 2014 we began granting restricted stock units under our 2014 Plan. For stock-based compensation expense, we measure the value of the restricted stock units based on the fair value of our common stock on the date of grant. Our restricted stock unit grants are subject to service conditions and we expense the fair value of those shares on a straight-line basis over their vesting periods. Our restricted stock unit activity for the nine months ended September 30, 2019 was as follows: Restricted Stock Units Weighted- Average Number of Grant Date Shares Fair Value Unvested, December 31, 2018 12,303,913 $ 4.63 Granted 9,738,871 5.45 Vested (6,075,000) 4.75 Forfeitures (2,161,696) 4.71 Unvested, September 30, 2019 13,806,088 $ 5.14 Bonus Plans In April 2017, the Compensation Committee of our board of directors approved the 2017 Executive Bonus Plan and 2017 Non-Executive Bonus Plan, or collectively, the 2017 Bonus Plans. The 2017 Bonus Plans provided for the issuance of shares of unrestricted common stock to employees based on the achievement of certain 2017 Company metrics. We issued 1,220,822 shares of unrestricted common stock in the first quarter of 2018, after withholding 752,564 shares to cover employee payroll taxes which we paid in cash totaling $3.7 million. In March 2018, the Compensation Committee of our board of directors approved the 2018 Non-Executive Bonus Plan and in April 2018, the Compensation Committee of our board of directors approved the 2018 Executive Bonus Plan, or collectively, the 2018 Bonus Plans. The 2018 Bonus Plans provided for the issuance of shares of unrestricted common stock to employees based on the achievement of certain 2018 Company metrics. We issued 1,338,220 shares of unrestricted common stock in the first quarter of 2019, after withholding 832,635 shares to cover employee payroll taxes which we paid in cash totaling $4.1 million. In March 2019, the Compensation Committee of our board of directors approved the 2019 Non-Executive Bonus Plan and the 2019 Executive Bonus Plan, or collectively, the 2019 Bonus Plans. The 2019 Bonus Plans provide for the issuance of shares of unrestricted common stock to employees based on the achievement of certain 2019 Company metrics. Shares issued under the aforementioned Bonus Plans are issued from our 2014 Plan and reduce the 2014 Plan shares available for issuance. We record stock-based compensation expense related to the Bonus Plans over the service period of eligible employees based on forecasted performance relative to the Company target metrics. To the extent that updated estimates of bonus expense differ from original estimates, the cumulative effect on current and prior periods of those changes is recorded in the period those estimates are revised. In the three months ended September 30, 2019, we recorded $559,000 of stock-based compensation expense under the 2019 Bonus Plans, which included a $1.2 million cumulative catchup credit based on adjustments to expected performance relative to Company’s target metrics. In the three months ended September 30, 2018, we recorded $2.0 million of stock-based compensation expense under the 2018 Bonus Plans. In the nine months ended September 30, 2019, we recorded $1.1 million of stock-based compensation expense under the 2018 Bonus Plans and $5.5 million of stock-based compensation expense under the 2019 Bonus Plans. In the nine months ended September 30, 2018, we recorded $1.9 million of stock-based compensation expense under the 2017 Bonus Plans and $6.5 million of stock-based compensation expense under the 2018 Bonus Plans. Stock Options Stock option activity under the 2008 Plan, 2014 Plan and 2015 Inducement Plan for the nine months ended September 30, 2019 was as follows: Options Outstanding Weighted- Number of Average Aggregate Shares Weighted- Remaining Intrinsic Available Number of Average Contractual Value for Issuance Shares Exercise Price Term (Years) (In thousands) Balance—December 31, 2018 2,337,545 4,496,557 $ 5.02 4.98 $ 2,446 Authorized 5,310,327 — Stock options granted (125,000) 125,000 4.52 Issuance of shares under Bonus Plans (2,170,855) — Shares withheld from net settlement of restricted stock units 1,064,577 Restricted stock units granted (7,568,016) — Exercised — (1,337,433) 4.10 Stock options canceled 355,029 (355,029) 6.99 Restricted stock units canceled 2,161,696 — Balance—September 30, 2019 1,365,303 2,929,095 $ 5.18 5.27 $ 4,877 Vested and exercisable—September 30, 2019 2,374,402 $ 5.36 4.48 $ 3,703 Vested and expected to vest(1)—September 30, 2019 2,837,136 $ 5.21 5.16 $ 4,688 (1) Options expected to vest reflect an estimated forfeiture rate. Our stock-based compensation expense was recorded in the following cost and expense categories (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Cost of revenue $ 1,052 $ 1,223 $ 3,859 $ 3,672 Research and development 3,279 3,670 11,015 11,780 Sales and marketing 2,029 2,653 6,367 7,341 General and administrative 1,652 1,834 5,918 5,700 Total $ 8,012 $ 9,380 $ 27,159 $ 28,493 We used the Black-Scholes Model to estimate the fair value of our stock options granted to employees with the following assumptions: Three Months Ended Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Expected dividend yield n/a — — — Risk-free interest rate n/a 2.8% 2.5% 2.7% Expected volatility n/a 50% 50% 52% Expected life (in years) n/a 6.1 6.1 6.1 No stock options were granted in the three months ended September 30, 2019. We used the Black-Scholes Model to estimate the fair value of our Employee Stock Purchase Plan awards with the following assumptions: Three Months Ended Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Expected dividend yield — — — — Risk-free interest rate 1.7% 2.5% 2.1% 2.2% Expected volatility 40% 43% 41% 47% Expected life (in years) 1.3 1.3 1.3 1.3 As required by Topic 718 Compensation—Stock Compensation , we estimate expected forfeitures and recognize compensation costs only for those equity awards expected to vest. As of September 30, 2019, unrecognized stock-based compensation expense and its remaining weighted-average recognition period was as follows: Unrecognized Remaining Stock-based Weighted-Average Compensation Recognition Expense Period (in millions) (in years) Stock options $ 0.9 2.7 Restricted stock units 52.3 2.9 ESPP 2.0 0.6 Total $ 55.2

Employee Benefit Plan

Employee Benefit Plan	9 Months Ended
	Sep. 30, 2019
Employee Benefit Plan
Employee Benefit Plan	10. Employee Benefit Plan We maintain a defined contribution 401(k) plan. The plan covers all full-time U.S. employees over the age of 21. Each employee can contribute up to $19,000 annually (with a $6,000 catch up contribution limit for employees aged 50 or older). We have the option to provide matching contributions, but have not done so to date.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2019
Commitments and Contingencies
Commitments and Contingencies	11. Commitments and Contingencies Litigation We continually evaluate uncertainties associated with litigation and record a charge equal to at least the minimum estimated liability for a loss contingency when both of the following conditions are met: (i) information available prior to issuance of the financial statements indicates that it is probable that a liability has been incurred at the date of the financial statements and (ii) the loss or range of loss can be reasonably estimated. If we determine that a loss is possible and a range of the loss can be reasonably estimated, we disclose the range of the possible loss in the Notes to the Consolidated Financial Statements. We evaluate, on a quarterly basis, developments in our legal matters that could affect the amount of liability that has been previously accrued, if any, and the matters and related ranges of possible losses disclosed, and make adjustments and changes to our disclosures as appropriate. Significant judgment is required to determine both likelihood of there being and the estimated amount of a loss related to such matters. Until the final resolution of such matters, there may be an exposure to loss, and such amounts could be material. For legal proceedings for which there is a reasonable possibility of loss (meaning those losses for which the likelihood is more than remote but less than probable), we have determined we do not have material exposure on an aggregate basis. Patent Claim We received a letter in August 2019 from BlackBerry Corp. asserting that our products and software infringe BlackBerry’s patents, and that we should take a license to its portfolio. BlackBerry did not specify any amount of damages in its letter. We have retained counsel and are evaluating BlackBerry’s letter, as well as potential counterclaims against BlackBerry. Should any lawsuit be filed by BlackBerry, we intend to defend ourselves vigorously. Indemnification Under the indemnification provisions of our standard sales related contracts, we agree to defend and/or settle claims brought by third parties against our customers and channel partners alleging that our software or the customer’s use thereof infringes the third-party’s intellectual property right, such as a patent right. These indemnification obligations are typically not subject to limitation; however if we believe such a claim is reasonably likely to occur and if it is commercially impractical for us to either procure the right for the customer to continue to use our software or modify our software so that it’s not infringing, we can terminate the customer agreement and refund the customer a portion of the license fees paid (prorated over the three year period from initial delivery for software licensed on a perpetual basis). We also on occasion indemnify our customers for other types of third-party claims. In addition, we indemnify our officers, directors, and certain key employees while they are serving in such capacities in good faith. Through September 30, 2019, we have not received any material written claim for indemnification.

Leases

Leases	9 Months Ended
	Sep. 30, 2019
Leases
Leases	12. We have operating leases for office facilities and data centers. Our leases have remaining lease terms of less than one year to approximately five years, some of which include options to extend the leases for up to five years, and some of which include options to terminate the leases within one year. The operating lease cost for the three months ended September 30, 2019 and 2018 was $1.3 million and $1.7 million, respectively. The operating lease cost for the nine months ended September 30, 2019 and 2018 was $4.7 million and $5.1 million, respectively. The future maturities of lease liabilities as of September 30, 2019 are as follows (in thousands): Year 2019 (remaining) $ 1,738 2020 6,071 2021 4,629 2022 3,261 2023 1,242 Thereafter 79 Total lease payments 17,020 Less: imputed interest (1,327) Total lease liability $ 15,693 All of our leases are classified as operating leases. In the three months ended September 30, 2019, the weighted average discount rate used to determine the lease liabilities was 5.0% and the weighted average remaining lease term was 36 months. As previously disclosed in our 2018 Annual Report on Form 10-K and under the previous lease accounting standard, future minimum lease payments for operating leases having initial or remaining noncancellable lease terms in excess of one year were as follows as of December 31, 2018 (in thousands): Year 2019 $ 7,144 2020 5,553 2021 4,083 2022 3,074 2023 1,163 Total $ 21,017

Unearned Revenue

Unearned Revenue	9 Months Ended
	Sep. 30, 2019
Unearned Revenue
Unearned Revenue	13. Changes in unearned revenue were as follows for the three and nine months ended September 30, 2019 and 2018: Three Months Ended Nine Months Ended September 30, September 30, (in thousands) 2019 2018 2019 2018 Balance, beginning of period $ 106,399 $ 82,934 $ 105,837 $ 77,022 Billings, excluding billings for customer arrangements with termination rights 46,246 55,819 135,904 144,107 Additions to unearned revenue upon expiration of termination rights 5,056 4,385 15,118 12,741 Recognition of revenue, net of change in unbilled accounts receivable* (50,900) (50,164) (150,058) (140,896) Balance, end of period $ 106,801 $ 92,974 $ 106,801 $ 92,974 * Reconciliation to Revenue Reported per Condensed Consolidated Statement of Operations: Three Months Ended Nine Months Ended September 30, September 30, (in thousands) 2019 2018 2019 2018 Revenue billed as of the end of period $ 50,900 $ 50,164 $ 150,058 $ 140,896 Increase (decrease) in total unbilled accounts receivable 1,301 (913) 1,090 (1,827) Revenue Reported in Condensed Consolidated Statement of Operations $ 52,201 $ 49,251 $ 151,148 $ 139,069 Revenue allocated to remaining performance obligations includes unearned revenue plus contractually committed amounts that will be invoiced and recognized as revenue in future periods, but excludes amounts invoiced and not recognized as revenue under customer arrangements that contain termination rights. Remaining performance obligations were $117.4 million as of September 30, 2019, of which we expect to recognize approximately 72% as revenue over the next 12 months and the remainder thereafter. As of September 30, 2019 and December 31, 2018, the balance of customer arrangements that contain termination rights was $16.2 million and $19.4 million, respectively.

Segment and Disaggregated Reven

Segment and Disaggregated Revenue Information	9 Months Ended
	Sep. 30, 2019
Segment and Disaggregated Revenue Information
Segment and Disaggregated Revenue Information	14. Segment and Disaggregated Revenue Information We conduct business globally. Our chief operating decision maker (Chief Executive Officer) reviews financial information presented on a consolidated basis accompanied by information about revenue by geographic region for purposes of allocating resources and evaluating financial performance. We have one business activity, software and services to manage and secure mobile devices, applications and content, and there are no segment managers who are held accountable for operations, operating results and plans for levels, components or types of products or services below the consolidated unit level. Accordingly, we are considered to be in a single reportable segment and operating unit structure. Approximately $2.2 million and $2.5 million as of September 30, 2019 and December 31, 2018, or 40% and 35%, respectively, of our net Property and Equipment was attributable to our operations located in India. Substantially all other long-lived assets were attributable to operations in the United States. Revenue by geographic region based on the billing address was as follows: Three Months Ended Nine Months Ended September 30, September 30, (in thousands) 2019 2018 2019 2018 Revenue United States $ 23,376 $ 21,654 $ 64,849 $ 61,061 International 28,825 27,597 86,299 78,008 Total $ 52,201 $ 49,251 $ 151,148 $ 139,069 We recognized revenue of $7.3 million, or 14% of total revenue, and $8.6 million, or 17% of total revenue, from customers with a billing address in Germany for the three months ended September 30, 2019 and 2018, respectively. We recognized revenue of $23.4 million, or 15% of total revenue, and $22.8 million, or 16% of total revenue, from customers with a billing address in Germany for the nine months ended September 30, 2019 and 2018, respectively. No other country, except for the United States and Germany, exceeded 10% of total revenue in the three or nine months ended September 30, 2019 or 2018. Revenue from recurring and non-recurring contractual arrangements was as follows: Three Months Ended Nine Months Ended September 30, September 30, (in thousands) 2019 2018 2019 2018 Cloud subscriptions - ratable $ 17,591 $ 13,199 $ 49,163 $ 36,181 On-premise subscriptions - point-in-time 5,964 6,337 17,394 15,332 On-premise subscriptions - ratable 4,902 4,121 13,872 11,956 Software support on perpetual licenses - ratable 16,363 16,013 48,669 46,912 Recurring revenue 44,820 39,670 129,098 110,381 Perpetual license - point-in-time 6,252 8,669 18,420 25,995 Professional services - point-in-time 1,129 912 3,630 2,693 Non-recurring revenue 7,381 9,581 22,050 28,688 Total revenue $ 52,201 $ 49,251 $ 151,148 $ 139,069

Net Loss per Share

Net Loss per Share	9 Months Ended
	Sep. 30, 2019
Net Loss per Share
Net Loss per Share	15. Net Loss per Share The following table sets forth the computation of basic and diluted net loss per share for the three and nine months ended September 30, 2019 and 2018 (in thousands, except per share data): Three Months Ended Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Numerator: Net loss $ (8,203) $ (7,498) $ (40,892) $ (35,875) Denominator: Weighted–average shares used to compute basic and diluted net loss per share 110,831 104,032 109,147 101,369 Basic and diluted net loss per share $ (0.07) $ (0.07) $ (0.37) $ (0.35) Basic net loss per share is computed by dividing the net loss by the weighted-average number of common shares outstanding for the period. Because we have reported a net loss for the three and nine months ended September 30, 2019 and 2018, the number of shares used to calculate diluted net loss per common share is the same as the number of shares used to calculate basic net loss per common share for those periods presented because the potentially dilutive shares would have been anti-dilutive if included in the calculation. The following potentially dilutive securities have been excluded from the computation of diluted weighted-average shares outstanding because such securities have an antidilutive impact due to losses reported (in common stock equivalent shares): September 30, September 30, 2019 2018 Stock options outstanding, net of unvested exercised stock options 2,929,095 5,122,470 Unvested restricted stock units 13,806,088 12,791,608 ESPP shares 194,622 194,366 Stock-settled bonus shares 499,612 740,489 Total potentially dilutive securities 17,429,417 18,848,933

Description of Business and S_2

Description of Business and Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2019
Description of Business and Significant Accounting Policies
Description of Business	Description of Business MobileIron, Inc. and its wholly owned subsidiaries, collectively, the “Company”, “we”, “us” or “our”, provides a purpose-built mobile IT platform that enables enterprises to manage and secure mobile applications, content and devices while providing their employees with device choice, privacy and a native user experience. We were incorporated in Delaware in July 2007 and are headquartered in Mountain View, California, with additional sales and support presence in North America, Europe, the Middle East, Asia and Australia and employees in India primarily focused on research and development.
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation The accompanying unaudited condensed consolidated financial statements as of September30, 2019 and for the three and nine months ended September 30, 2019 and 2018 have been prepared in accordance with U.S. generally accepted accounting principles, or GAAP, for interim financial statements and pursuant to the rules and regulations of the SEC, and include the accounts of our wholly owned subsidiaries. Intercompany accounts and transactions have been eliminated in consolidation. Certain information and footnote disclosures in this Quarterly Report on Form 10-Q normally included in annual financial statements prepared in accordance with U.S. GAAP and pursuant to the rules and regulations of the SEC have been condensed or omitted pursuant to such rules and regulations. In the opinion of management, the unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary for a fair presentation of our balance sheet as of September 30, 2019, our operating results for the three and nine months ended September 30, 2019 and 2018, and our cash flows for the nine months ended September 30, 2019 and 2018. Our operating results for the three and nine months ended September 30, 2019 are not necessarily indicative of the results that may be expected for the fiscal year ending December 31, 2019. The condensed consolidated balance sheet as of December 31, 2018 has been derived from the audited consolidated financial statements as of that date, but does not include all the footnotes required by U.S. GAAP for complete financial statements. The accompanying unaudited condensed consolidated financial statements and related financial information should be read in conjunction with our audited financial statements and related notes for the year ended December 31, 2018, included in our Annual Report on Form 10-K for the year ended December 31, 2018 previously filed with the SEC.
Foreign Currency Translation	Foreign Currency Translation Our reporting currency is the U.S. dollar. The functional currency of all our international operations is the U.S. dollar. All monetary asset and liability accounts are translated into U.S. dollars at the period-end rate, nonmonetary assets and liabilities are translated at historical exchange rates, and revenue and expenses are translated at the weighted-average exchange rates in effect during the period. Translation adjustments are recorded as foreign currency gains (losses) in the condensed consolidated statements of operations. We recognized a foreign currency loss of $420,000 and $217,000 in the three months ended September 30, 2019 and 2018, respectively, and $612,000 and $571,000 in the nine months ended September 30, 2019 and 2018, respectively, in other income (expense)—net in our condensed consolidated statements of operations.
Use of Estimates	Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. These estimates include, but are not limited to, revenue recognition, deferred commissions and commissions expense, stock-based compensation, goodwill, and accounting for income taxes. Actual results could differ from those estimates.
Concentrations of Credit Risk	Concentrations of Credit Risk Financial instruments that potentially subject us to a concentration of credit risk consist of cash, money market funds and fixed income investments. Although we deposit our cash with multiple financial institutions, our deposits, at times, exceed federally insured limits. We invest in fixed income securities that are of high-credit quality. Substantially all of our money market funds, or $43.9 million, are held in five funds that are rated “AAA.” We generally do not require collateral or other security in support of accounts receivable. Allowances are provided for individual accounts receivable when we become aware of a customer’s inability to meet its financial obligations, such as in the case of bankruptcy, deterioration of the customer’s operating results, or change in financial position. If circumstances related to customers change, estimates of the recoverability of receivables would be further adjusted. We also consider broader factors in evaluating the sufficiency of our allowances for doubtful accounts, including the length of time receivables are past due, significant one-time events and historical experience. At September 30, 2019 and December 31, 2018, we had an allowance for doubtful accounts of $391,000 and $425,000, respectively. One reseller accounted for 10% of total revenue for both the three and nine months ended September 30, 2019, and for 11% of total revenue for both the three and nine months ended September 30, 2018, respectively. No other resellers or end-user customers accounted for 10% or more of our total revenue for any period presented. One reseller accounted for 11% of our net accounts receivable at September 30, 2019. No other reseller or end-user customer accounted for 10% or more of net accounts receivable at December 31, 2018.
Segments	Segments We have one reportable segment, software and services to manage and secure mobile devices, applications and content.
Revenue Recognition	Revenue Recognition Revenue Presentation Cloud services include sales of cloud-based solutions that allow customers to use hosted software over a contract period without taking possession of our software and are typically provided on a subscription or usage basis. License revenue includes sales of perpetual software licenses, software licenses sold as part of on-premise term subscriptions, and appliances. Software support and services revenue includes sales of software support sold as part of on-premise term subscriptions, software support for perpetual licenses, and professional services. Revenue Recognition Revenue is recognized upon transfer of control of promised products or services to customers in an amount that reflects the consideration we expect to receive in exchange for those products or services. We enter into contracts that can include various combinations of products and services, which are generally capable of being distinct and accounted for as separate performance obligations. Revenue is recognized net of allowances for returns and any taxes collected from customers, which are subsequently remitted to governmental authorities. Nature of Products and Services Cloud services, which allow customers to use hosted software over a contract period without taking possession of our software, are provided on a subscription or usage basis. Revenue related to cloud services provided on a subscription basis is recognized ratably over the contract period and revenue related to cloud services based on usage is generally recognized as the usage occurs. Licenses for on-premise software provide the customer with a right to use the software as it exists when made available to the customer. Customers may purchase on-premise software licenses as perpetual licenses or as part of subscriptions. On-premise licenses are considered distinct performance obligations and revenue from the licenses is recognized upfront when the software is made available to the customer. In the case of our on-premise subscriptions, the license portion of revenue is recognized up-front, and the software support and services portion is recognized ratably. Software support and services convey rights to the upgrades released over the contract period and provide support and tools to help customers deploy and use our products more efficiently. Revenue allocated to software support and services is generally recognized ratably over the contract period as customers simultaneously consume and receive benefits, given that the software support and services comprises a distinct performance obligation that is satisfied over time. On-premise subscriptions and software support and services occasionally contain termination rights. We recognize revenue from those arrangements, including the distinct licenses contained therein, as the termination rights for the performance obligation expire. See also Unearned Revenue and Customer Arrangements with Termination Rights below. Professional services include consulting, deployment and training services. Our professional services represent distinct performance obligations as our customers benefit from the services separately or together with other readily available resources. Professional services revenue is recognized as services are delivered. Appliance revenue was less than 5% of total revenue for all periods presented and is included as a component of license revenue within the consolidated statements of operations. Refer to Note 14 – Segment and Disaggregation of Revenue Information for further information. Significant Judgments Our contracts with customers often include promises to transfer multiple products and services to a customer. Determining whether products and services are considered distinct performance obligations that should be accounted for separately versus together may require significant judgment. Judgment is required to determine whether a software license is considered distinct and accounted for separately, or not distinct and accounted for together with the software support and services and recognized over time. Judgment is required to determine the standalone selling price (“SSP”) for each distinct performance obligation. We use a range of amounts to estimate the SSP for items that are not sold separately, including on-premises licenses sold with software support and services. In instances where SSP is not directly observable, such as when we do not sell the product or service separately, we determine the SSP using information that may include other observable inputs. We typically have more than one SSP for individual products and services due to the stratification of those products and services by customer classes and circumstances. In these instances, we may use information such as the size and type of customer in determining the SSP. Contract Balances Timing of revenue recognition may differ from the timing of invoicing customers. We record a receivable when revenue is recognized prior to invoicing, or unearned revenue when revenue will be recognized after invoicing. For multi-year agreements, we either invoice our customer in full at the inception of the contract or annually at the beginning of each annual period. We record an unbilled receivable related to revenue recognized for multi-year on-premise licenses invoiced annually when we have an unconditional right to invoice and receive payment in the future for those licenses or when we have the right to invoice future monthly periods under committed monthly recurring charge (“MRC”) agreements. The majority of our MRC agreements are for a month to month term (“non-committed”) or usage-based. Payment terms and conditions vary by contract type, although terms generally include a requirement to pay within 30 to 60 days. In instances where the timing of revenue recognition differs from the timing of invoicing, we have determined our contracts generally do not include a significant financing component. The primary purpose of our invoicing terms is to provide customers with simplified and predictable ways of purchasing our products and services, not to receive financing from our customers or to provide customers with financing. This includes invoicing at the beginning of a subscription term with revenue recognized ratably over the contract period or multi-year on-premise licenses that are invoiced annually with a portion of the revenue recognized upfront. As of September 30, 2019 and December 31, 2018, the balance of accounts receivable, net of the allowance for doubtful accounts, included $2.2 million and $1.4 million, respectively, of unbilled receivables from upfront recognition of revenue for certain multi-period on-premises software subscriptions that include both distinct software licenses and software support and services. As of September 30, 2019 and December 31, 2018, unbilled receivables included in other long-term assets on our consolidated balance sheets were $858,000 and $592,000, respectively. Unearned Revenue and Customer Arrangements with Termination Rights We generally invoice our customers upfront for subscriptions and software support and services associated with perpetual licenses. Unearned revenue from those upfront billings is comprised of unearned revenue from cloud-based subscriptions, software support and services for on-premise subscriptions, software support and services associated with perpetual licenses and professional services to be performed in the future. Because some of our arrangements with customers contain termination rights, the arrangements do not meet the definition of a contract under Accounting Standard Codification, or ASC, Topic 606, Revenue Recognition from Contracts with Customers, or ASC 606, and are not recorded as unearned revenue and instead are recorded as “customer arrangements with termination rights” on our consolidated balance sheets. Refer to Note 13 – Unearned Revenue for further information on unearned revenue, changes in unearned revenue during the period, and customer arrangements with termination rights. Deferred Commissions We recognize an asset for the incremental costs of obtaining a contract with a customer. We have determined that certain sales incentive programs meet the requirements to be capitalized and we include those costs in current and non-current deferred commissions on our consolidated balance sheets. Deferred commissions are amortized over the period commensurate with revenue recognition. Changes in deferred commissions were as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Balance, beginning of the period $ 17,727 $ 16,928 $ 17,331 $ 18,408 Deferral of commissions earned 4,271 4,158 12,862 10,953 Recognition of commission expense (4,867) (4,095) (12,844) (12,370) Impairment of deferred commissions (21) — (239) — Balance, end of the period $ 17,110 $ 16,991 $ 17,110 $ 16,991
Cash Equivalents	Cash Equivalents We consider all highly liquid investments with an original maturity of three months or less to be cash equivalents. As of September 30, 2019 and December 31, 2018, cash and cash equivalents consist of cash deposited with banks, money market funds and investments that mature within three months of their purchase.
Held-To-Maturity Investments	Held-To-Maturity Investments We determine the appropriate classification of our fixed income investments at the time of purchase and reevaluate their classifications each reporting period. Investments are classified as held-to-maturity since the Company has positive intent and the ability to hold the securities to maturity. Held-to-maturity securities are stated at amortized cost.
Comprehensive Loss	Comprehensive Loss Comprehensive loss includes all changes in equity (net assets) during a period from non-owner sources. For the three and nine months ended September 30, 2019 and 2018, there were no differences between net loss and comprehensive loss. Therefore, the consolidated statements of comprehensive loss have been omitted.
Net Loss per Share of Common Stock	Net Loss per Share of Common Stock Basic net loss per common share is calculated by dividing the net loss by the weighted-average number of common shares outstanding during the period after repurchases but without consideration for potentially dilutive securities. Diluted net loss per share is computed by dividing the net loss by the weighted-average number of common shares and potentially dilutive securities outstanding for the period determined using the treasury-stock and if-converted methods. For purposes of the diluted net loss per share calculation, unvested restricted stock and stock options are considered to be potentially dilutive securities. Because we have reported a net loss for the three and nine months ended September 30, 2019 and 2018, the number of shares used to calculate diluted net loss per common share is the same as the number of shares used to calculate basic net loss per common share for those periods presented because the potentially dilutive shares would have been anti-dilutive if included in the calculation.
Software Development Costs Incurred in Connection with Software to be Sold or Marketed	Software Development Costs Incurred in Connection with Software to be Sold or Marketed The costs to develop new software products and enhancements to existing software products are expensed as incurred until technological feasibility has been established. We consider technological feasibility to have occurred when all planning, designing, coding and testing have been completed according to design specifications. Once technological feasibility is established, any additional costs would be capitalized. We believe our current process for developing software is essentially completed concurrent with the establishment of technological feasibility, and accordingly, no costs have been capitalized.
Internal Use Software	Internal Use Software We capitalize costs incurred during the application development stage related to our internally used software. Such costs are primarily incurred by third-party vendors and consultants. Costs related to preliminary project activities and post-implementation activities are expensed as incurred. Amounts capitalized in all periods presented were not significant. All software development costs incurred in connection with our cloud offering, or SaaS, are also sold or marketed to partners or end customers, therefore we start capitalizing costs when technological feasibility is achieved. No costs were capitalized in any periods presented as we believe that our current process for developing software is essentially completed concurrent with the establishment of technological feasibility.
Property and Equipment	Property and Equipment Property and equipment are stated at cost. Depreciation is computed using the straight-line method over the estimated useful life of the property and equipment, determined to be three years for computers and equipment and software, five years for furniture and fixtures, and the lesser of the remaining lease term or estimated useful life for leasehold improvements. Expenditures for repairs and software support are charged to expense as incurred. Upon disposition, the cost and related accumulated depreciation are removed from the accounts and the resulting gain or loss is reflected as operating expenses in the consolidated statements of operations.
Leases	Leases T he new leasing standard, Accounting Standards Codification 842, “Leases”, or ASC 842, requires us to record current and noncurrent lease liabilities and a right-of-use (“ROU”) asset on our condensed consolidated balance sheet for contractual arrangements that convey the right to control the use of identified property, plant, or equipment for a period of time in exchange for consideration . We adopted ASC 842 as of January 1, 2019 and, as permitted, we recorded lease liabilities and a ROU asset beginning March 31, 2019 and did not restate our prior periods. We determine if an arrangement is a lease conveying the right to control identified property, plant, or equipment and whether the lease is operating or financing at the lease’s inception. We have determined that all of our leases are operating 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 under the lease arrangements. Operating lease ROU assets and liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. As our leases do not provide an implicit interest rate, we use our incremental borrowing rate based on the information available at the lease commencement date to determine the present value of lease payments. The operating lease ROU asset also includes any advance lease payments made and excludes lease incentives. 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 is recognized on a straight-line basis over the lease term. We have adopted the practical expedient as permitted by the new leasing standard to not recognize lease assets and lease liabilities for leases with a term of 12 months or less. Our leases generally separate lease components from nonlease components. However, where lease and nonlease components are combined in our lease arrangements, we have adopted the practical expedient to not separate the lease from the nonlease components. Refer to Note 12 - Leases for further information about our leases.
Goodwill	Goodwill We record the excess of the acquisition purchase price over the fair value of the tangible and identifiable intangible assets acquired as goodwill. We perform an impairment test of our goodwill in the third quarter of our fiscal year, or more frequently if indicators of potential impairment arise. We have a single reporting unit and consequently evaluate goodwill for impairment based on an evaluation of the fair value of the Company as a whole.
Long-Lived Assets with Finite Lives	Long-Lived Assets with Finite Lives Long-lived assets are reviewed for possible impairment whenever events or circumstances indicate that the carrying amount of these assets may not be recoverable. We evaluate the recoverability of each of our long-lived assets, including property and equipment, by comparison of its carrying amount to the future discounted cash flows we expect the asset to generate. If we consider the asset to be impaired, we measure the amount of any impairment as the difference between the carrying amount and the fair value of the impaired asset.
Stock-Based Compensation	Stock-Based Compensation We use the estimated grant-date fair value method of accounting in accordance with ASC Topic 718 Compensation—Stock Compensation . Fair value is determined using the Black-Scholes Model using various inputs, including our estimates of expected volatility, term and future dividends. We estimated the forfeiture rate based on our historical experience for annual grant years where the majority of the vesting terms have been satisfied. We recognize compensation costs for awards with service and performance vesting conditions and for our Employee Stock Purchase Plan, or ESPP, on an accelerated method over the requisite service period of the award. For stock options or restricted stock unit grants with no performance condition, we recognize compensation costs on a straight-line basis over the requisite service period of the award, which is generally the vesting term of four years.
Research and Development	Research and Development Because we estimate that our software is essentially completed concurrent with the establishment of technological feasibility, we have charged all research and development to expense as incurred.
Advertising	Advertising Advertising costs are expensed and included in sales and marketing expense when incurred. Advertising expense for the three and nine months ended September 30, 2019 and 2018 was not significant.
Income Taxes	Income Taxes We account for income taxes in accordance with ASC Topic 740, Income Taxes , under which deferred tax liabilities and assets are recognized for the expected future tax consequences of temporary differences between financial statement carrying amounts and the tax basis of assets and liabilities and net operating loss and tax credit carryforwards. Valuation allowances are established when necessary to reduce deferred tax assets to the amount expected to be realized. We use a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. A tax position is recognized when it is more likely than not that the tax position will be sustained upon examination, including resolution of any related appeals or litigation processes. A tax position that meets the more-likely-than-not recognition threshold is measured at the largest amount of benefit that is greater than 50% likely of being realized upon ultimate settlement with a taxing authority. The standard also provides guidance on derecognition of tax benefits, classification on the balance sheet, interest and penalties, accounting in interim periods, disclosure and transition.
Recent Accounting Pronouncements	Recent Accounting Pronouncements From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board, or FASB, or other standard setting bodies and adopted by us as of the specified effective date. Unless otherwise discussed, the impact of recently issued standards that are not yet effective will not have a material impact on our financial position or results of operations upon adoption. Financial Instruments – Credit Losses In June 2016, the FASB issued Accounting Standards Update (“ASU”) No. 2016-13, Financial Instruments – Credit Losses – Measurement of Credit Losses on Financial Instruments, which introduces a model based on expected losses to estimate credit losses for most financial assets and certain other instruments. In addition, for available-for-sale debt securities with unrealized losses, the losses will be recognized as allowances rather than reductions in the amortized cost of the securities. The standard is effective for annual reporting periods beginning after December 15, 2019, with early adoption permitted for annual reporting periods beginning after December 15, 2018. Entities will apply the standard’s provisions by recording a cumulative-effect adjustment to retained earnings. We are evaluating the impact of the adoption on our consolidated balance sheet, results of operations, cash flows and disclosures . We intend to adopt ASU No. 2016-13 effective January 1, 2020. Simplifying the Test for Goodwill Impairment In January 2017, the FASB issued ASU 2017-04, “Simplifying the Test for Goodwill Impairment.” This ASU simplifies the subsequent measurement of goodwill by eliminating Step 2 from the goodwill impairment test. The annual, or interim, goodwill impairment test is performed by comparing the fair value of a reporting unit with its carrying amount. An impairment charge should be recognized for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. In addition, income tax effects from any tax-deductible goodwill on the carrying amount of the reporting unit should be considered when measuring the goodwill impairment loss, if applicable. This ASU should be applied on a prospective basis. The ASU is effective for annual and interim reporting periods beginning after December 15, 2021. Early adoption is permitted. We do not expect the adoption of this ASU to have a material impact on our consolidated financial position, results of operations, or cash flows.

Description of Business and S_3

Description of Business and Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2019
ASC 606
Schedule of changes in deferred commissions	Three Months Ended Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Balance, beginning of the period $ 17,727 $ 16,928 $ 17,331 $ 18,408 Deferral of commissions earned 4,271 4,158 12,862 10,953 Recognition of commission expense (4,867) (4,095) (12,844) (12,370) Impairment of deferred commissions (21) — (239) — Balance, end of the period $ 17,110 $ 16,991 $ 17,110 $ 16,991

Significant Balance Sheet Com_2

Significant Balance Sheet Components (Tables)	9 Months Ended
	Sep. 30, 2019
Significant Balance Sheet Components
Schedule of accounts receivable, net	Accounts receivable, net at September 30, 2019 and December 31, 2018 consisted of the following (in thousands): September 30, 2019 December 31, 2018 Accounts receivable - billed $ 42,749 $ 60,037 Accounts receivable - unbilled 2,206 1,382 Allowance for doubtful accounts (391) (425) Accounts receivable, net $ 44,564 $ 60,994
Schedule of property and equipment	Property and equipment at September 30, 2019 and December 31, 2018 consisted of the following (in thousands): September 30, 2019 December 31, 2018 Computers and appliances $ 14,218 $ 13,517 Purchased software 4,886 4,711 Furniture and fixtures 1,799 1,695 Leasehold improvements 3,400 3,503 Total property and equipment 24,303 23,426 Accumulated depreciation and amortization (18,774) (16,380) Total property and equipment—net $ 5,529 $ 7,046
Schedule of accrued expenses	Accrued expenses at September 30, 2019 and December 31, 2018 consisted of the following (in thousands): September 30, 2019 December 31, 2018 Accrued commissions $ 4,567 $ 4,398 Accrued stock-settled bonus 5,454 9,355 Employee Stock Purchase Plan liability 890 1,923 Other accrued payroll-related expenses 3,113 3,630 Accrued royalties 2,091 3,596 Other accrued liabilities 4,337 4,445 Total accrued expenses $ 20,452 $ 27,347

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	9 Months Ended
	Sep. 30, 2019
Fair Value Measurement
Schedule of financial instruments measured at fair market value	As of September 30, 2019 (in thousands) Level 1 Level 2 Level 3 Total Money market funds $ 43,930 $ — $ — $ 43,930 Corporate debt securities — 930 — 930 U.S. treasuries — 3,897 — 3,897 Commercial paper — 36,191 — 36,191 Total $ 43,930 $ 41,018 $ — $ 84,948 As of December 31, 2018 (in thousands) Level 1 Level 2 Level 3 Total Money market funds $ 36,617 $ — $ — $ 36,617 Corporate debt securities — 6,555 — 6,555 Commercial paper — 53,598 — 53,598 Total $ 36,617 $ 60,153 $ — $ 96,770

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2019
Investments
Schedule of investments in fixed income securities	As of September 30, 2019 Amortized Fair (in thousands) Cost Gains Losses Value Corporate debt securities $ 930 $ — $ — $ 930 U.S. treasuries 3,897 — — 3,897 Commercial paper 36,193 — (2) 36,191 Total $ 41,020 $ — $ (2) $ 41,018 As of December 31, 2018 Amortized Fair (in thousands) Cost Gains Losses Value Corporate debt securities $ 6,556 $ — $ (1) $ 6,555 Commercial paper 53,600 1 (3) 53,598 Total $ 60,156 $ 1 $ (4) $ 60,153
Summary of balance sheet classification of investments	As of September 30, As of December 31, (in thousands) 2019 2018 Cash equivalents $ 39,123 $ 59,156 Short-term investments 1,897 1,000 Total investments $ 41,020 $ 60,156
Schedule of held-to-maturity investments by contractual maturity	As of September 30, 2019 As of December 31, 2018 Gross Gross Amortized Fair Amortized Fair (in thousands) Cost Value Cost Value Due in one year or less $ 41,020 $ 41,018 $ 60,156 $ 60,153 Due after one year through five years — — — — Total $ 41,020 $ 41,018 $ 60,156 $ 60,153

Restructuring Expense (Tables)

Restructuring Expense (Tables)	9 Months Ended
	Sep. 30, 2019
Restructuring Expense
Summary of restructuring activities	Severance and Other Restructuring Costs Three Months Ended Nine Months Ended September 30, 2019 Accrued restructuring, beginning of the period $ 1,047 $ — Provision for restructuring expense — 1,561 Cash payments (441) (955) Accrued restructuring, end of the period $ 606 $ 606

Common Stock (Tables)

Common Stock (Tables)	9 Months Ended
	Sep. 30, 2019
Common Stock
Schedule of reserved shares of common stock for issuance	September 30, December 31, 2019 2018 Options outstanding 2,929,095 4,496,557 Unvested restricted stock units outstanding 13,806,088 12,303,913 Shares available for grant under the 2014 Equity Incentive Plan and 2015 Inducement Plan 1,365,303 2,337,545 Shares available for purchase under the Employee Stock Purchase Plan 378,525 364,762 Total 18,479,011 19,502,777

Share Based Awards (Tables)

Share Based Awards (Tables)	9 Months Ended
	Sep. 30, 2019
Share Based Awards
Schedule of restricted stock unit activity	Restricted Stock Units Weighted- Average Number of Grant Date Shares Fair Value Unvested, December 31, 2018 12,303,913 $ 4.63 Granted 9,738,871 5.45 Vested (6,075,000) 4.75 Forfeitures (2,161,696) 4.71 Unvested, September 30, 2019 13,806,088 $ 5.14
Schedule of stock option activity under the 2008 Plan, 2014 Plan and 2015 Inducement Plan	Options Outstanding Weighted- Number of Average Aggregate Shares Weighted- Remaining Intrinsic Available Number of Average Contractual Value for Issuance Shares Exercise Price Term (Years) (In thousands) Balance—December 31, 2018 2,337,545 4,496,557 $ 5.02 4.98 $ 2,446 Authorized 5,310,327 — Stock options granted (125,000) 125,000 4.52 Issuance of shares under Bonus Plans (2,170,855) — Shares withheld from net settlement of restricted stock units 1,064,577 Restricted stock units granted (7,568,016) — Exercised — (1,337,433) 4.10 Stock options canceled 355,029 (355,029) 6.99 Restricted stock units canceled 2,161,696 — Balance—September 30, 2019 1,365,303 2,929,095 $ 5.18 5.27 $ 4,877 Vested and exercisable—September 30, 2019 2,374,402 $ 5.36 4.48 $ 3,703 Vested and expected to vest(1)—September 30, 2019 2,837,136 $ 5.21 5.16 $ 4,688 (1) Options expected to vest reflect an estimated forfeiture rate.
Schedule of stock-based compensation expense recognized	Three Months Ended Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Cost of revenue $ 1,052 $ 1,223 $ 3,859 $ 3,672 Research and development 3,279 3,670 11,015 11,780 Sales and marketing 2,029 2,653 6,367 7,341 General and administrative 1,652 1,834 5,918 5,700 Total $ 8,012 $ 9,380 $ 27,159 $ 28,493
Schedule of assumptions used to estimate fair value of stock options granted to employees	Three Months Ended Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Expected dividend yield n/a — — — Risk-free interest rate n/a 2.8% 2.5% 2.7% Expected volatility n/a 50% 50% 52% Expected life (in years) n/a 6.1 6.1 6.1
Schedule of assumptions used to estimate the fair value of Employee Stock Purchase Plan awards	Three Months Ended Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Expected dividend yield — — — — Risk-free interest rate 1.7% 2.5% 2.1% 2.2% Expected volatility 40% 43% 41% 47% Expected life (in years) 1.3 1.3 1.3 1.3
Schedule of unrecognized stock-based compensation expense and its remaining weighted-average recognition period	Unrecognized Remaining Stock-based Weighted-Average Compensation Recognition Expense Period (in millions) (in years) Stock options $ 0.9 2.7 Restricted stock units 52.3 2.9 ESPP 2.0 0.6 Total $ 55.2

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2019
Leases
Summary of future maturities of lease liabilities	Year 2019 (remaining) $ 1,738 2020 6,071 2021 4,629 2022 3,261 2023 1,242 Thereafter 79 Total lease payments 17,020 Less: imputed interest (1,327) Total lease liability $ 15,693
Schedule of future minimum lease payments	Year 2019 $ 7,144 2020 5,553 2021 4,083 2022 3,074 2023 1,163 Total $ 21,017

Unearned Revenue (Tables)

Unearned Revenue (Tables)	9 Months Ended
	Sep. 30, 2019
Unearned Revenue
Schedule of changes in unearned revenue	Three Months Ended Nine Months Ended September 30, September 30, (in thousands) 2019 2018 2019 2018 Balance, beginning of period $ 106,399 $ 82,934 $ 105,837 $ 77,022 Billings, excluding billings for customer arrangements with termination rights 46,246 55,819 135,904 144,107 Additions to unearned revenue upon expiration of termination rights 5,056 4,385 15,118 12,741 Recognition of revenue, net of change in unbilled accounts receivable* (50,900) (50,164) (150,058) (140,896) Balance, end of period $ 106,801 $ 92,974 $ 106,801 $ 92,974 * Reconciliation to Revenue Reported per Condensed Consolidated Statement of Operations: Three Months Ended Nine Months Ended September 30, September 30, (in thousands) 2019 2018 2019 2018 Revenue billed as of the end of period $ 50,900 $ 50,164 $ 150,058 $ 140,896 Increase (decrease) in total unbilled accounts receivable 1,301 (913) 1,090 (1,827) Revenue Reported in Condensed Consolidated Statement of Operations $ 52,201 $ 49,251 $ 151,148 $ 139,069

Segment and Disaggregated Rev_2

Segment and Disaggregated Revenue Information (Tables)	9 Months Ended
	Sep. 30, 2019
Segment and Disaggregated Revenue Information
Schedule of revenue by geographic region	Three Months Ended Nine Months Ended September 30, September 30, (in thousands) 2019 2018 2019 2018 Revenue United States $ 23,376 $ 21,654 $ 64,849 $ 61,061 International 28,825 27,597 86,299 78,008 Total $ 52,201 $ 49,251 $ 151,148 $ 139,069
Revenue from recurring and non-recurring contractual arrangements	Three Months Ended Nine Months Ended September 30, September 30, (in thousands) 2019 2018 2019 2018 Cloud subscriptions - ratable $ 17,591 $ 13,199 $ 49,163 $ 36,181 On-premise subscriptions - point-in-time 5,964 6,337 17,394 15,332 On-premise subscriptions - ratable 4,902 4,121 13,872 11,956 Software support on perpetual licenses - ratable 16,363 16,013 48,669 46,912 Recurring revenue 44,820 39,670 129,098 110,381 Perpetual license - point-in-time 6,252 8,669 18,420 25,995 Professional services - point-in-time 1,129 912 3,630 2,693 Non-recurring revenue 7,381 9,581 22,050 28,688 Total revenue $ 52,201 $ 49,251 $ 151,148 $ 139,069

Net Loss per Share (Tables)

Net Loss per Share (Tables)	9 Months Ended
	Sep. 30, 2019
Net Loss per Share
Computation of basic and diluted net loss per share	The following table sets forth the computation of basic and diluted net loss per share for the three and nine months ended September 30, 2019 and 2018 (in thousands, except per share data): Three Months Ended Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Numerator: Net loss $ (8,203) $ (7,498) $ (40,892) $ (35,875) Denominator: Weighted–average shares used to compute basic and diluted net loss per share 110,831 104,032 109,147 101,369 Basic and diluted net loss per share $ (0.07) $ (0.07) $ (0.37) $ (0.35)
Schedule of antidilutive securities excluded from computation of diluted weighted-average shares outstanding	September 30, September 30, 2019 2018 Stock options outstanding, net of unvested exercised stock options 2,929,095 5,122,470 Unvested restricted stock units 13,806,088 12,791,608 ESPP shares 194,622 194,366 Stock-settled bonus shares 499,612 740,489 Total potentially dilutive securities 17,429,417 18,848,933

Description of Business and S_4

Description of Business and Significant Accounting Policies (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2019USD ($)item	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)segmentitem	Sep. 30, 2018USD ($)	Dec. 31, 2018USD ($)
Description Of Business And Significant Accounting Policies [Line Items]
AAA-rated money market funds	$ 43,900,000		$ 43,900,000
Number of Money Market Funds | item	5		5
Accounts receivable, allowance	$ 391,000		$ 391,000		$ 425,000
Bad Debt Expense				$ 80,000
Number of reportable segments | segment			1
Other income (expense)—net
Description Of Business And Significant Accounting Policies [Line Items]
Foreign currency (loss)/gain	$ (420,000)	$ (217,000)	$ (612,000)	$ (571,000)
Customer concentration risk | Reseller | Total revenue
Description Of Business And Significant Accounting Policies [Line Items]
Concentration risk, number of resellers | item	1		1
Concentration risk, percentage	10.00%	11.00%	10.00%	11.00%
Customer concentration risk | Reseller | Net accounts receivable
Description Of Business And Significant Accounting Policies [Line Items]
Concentration risk, number of resellers | item			1
Concentration risk, percentage			11.00%

Description of Business and S_5

Description of Business and Significant Accounting Policies - Revenue Recognition (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Description Of Business And Significant Accounting Policies [Line Items]
Accounts receivable, net	$ 44,564,000		$ 44,564,000		$ 60,994,000
Unbilled receivables, current	2,200,000		2,200,000		1,400,000
Deferred commissions balance, beginning of period	17,727,000	$ 16,928,000	17,331,000	$ 18,408,000	18,408,000
Deferral of commissions earned	4,271,000	4,158,000	12,862,000	10,953,000
Recognition of commission expense	(4,867,000)	(4,095,000)	(12,844,000)	(12,370,000)
Impairment of deferred commissions	(21,000)		(239,000)
Deferred commissions balance, end of period	17,110,000	$ 16,991,000	17,110,000	$ 16,991,000	17,331,000
Other long-term assets
Description Of Business And Significant Accounting Policies [Line Items]
Unbilled receivables, noncurrent	$ 858,000		$ 858,000		$ 592,000
Minimum
Description Of Business And Significant Accounting Policies [Line Items]
Payment terms			30 days
Maximum
Description Of Business And Significant Accounting Policies [Line Items]
Payment terms			60 days
Total revenue | Product | Appliance | Maximum
Description Of Business And Significant Accounting Policies [Line Items]
Concentration risk, percentage			5.00%

Description of Business and S_6

Description of Business and Significant Accounting Policies - Software Development Costs Incurred to Stock-Based Compensation (Details)	9 Months Ended
	Sep. 30, 2019USD ($)
Description Of Business And Significant Accounting Policies [Line Items]
Capitalized development costs of software to be sold or marketed	$ 0
Capitalized development costs of software for internal use	$ 0
Stock-based compensation, vesting term (in years)	4 years
Computers and appliances
Description Of Business And Significant Accounting Policies [Line Items]
Property plant and equipment useful life	3 years
Furniture and fixtures
Description Of Business And Significant Accounting Policies [Line Items]
Property plant and equipment useful life	5 years

Significant Balance Sheet Com_3

Significant Balance Sheet Components - Accounts Receivable, Net (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Accounts Receivable, Net
Allowance for doubtful accounts	$ (391,000)	$ (425,000)
Accounts receivable, net	44,564,000	60,994,000
Billed
Accounts Receivable, Net
Accounts receivable	42,749,000	60,037,000
Unbilled
Accounts Receivable, Net
Accounts receivable	$ 2,206,000	$ 1,382,000

Significant Balance Sheet Com_4

Significant Balance Sheet Components - Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Total property and equipment	$ 24,303	$ 23,426
Accumulated depreciation and amortization	(18,774)	(16,380)
Total property and equipment-net	5,529	7,046
Computers and appliances
Property Plant And Equipment [Line Items]
Total property and equipment	14,218	13,517
Purchased software
Property Plant And Equipment [Line Items]
Total property and equipment	4,886	4,711
Furniture and fixtures
Property Plant And Equipment [Line Items]
Total property and equipment	1,799	1,695
Leasehold improvements
Property Plant And Equipment [Line Items]
Total property and equipment	$ 3,400	$ 3,503

Significant Balance Sheet Com_5

Significant Balance Sheet Components - Prepaid Royalties and Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accrued commissions	$ 4,567	$ 4,398
Accrued stock-settled bonus	5,454	9,355
Employee Stock Purchase Plan liability	890	1,923
Other accrued payroll-related expenses	3,113	3,630
Accrued royalties	2,091	3,596
Other accrued liabilities	4,337	4,445
Total accrued expenses	20,452	27,347
Prepaid expenses and other current assets
Prepaid royalties	7,800	3,800
Other assets
Prepaid royalties	$ 3,300	$ 3,400

Fair Value Measurement (Details

Fair Value Measurement (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Financial and nonfinancial liabilities measured at fair value	$ 0	$ 0
Nonfinancial assets measured at fair value	0	0
U.S. Treasuries
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total	3,897
U.S. Treasuries | Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total	3,897
Recurring basis
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total	84,948	96,770
Recurring basis | Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total	43,930	36,617
Recurring basis | Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total	41,018	60,153
Recurring basis | Money market funds
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total	43,930	36,617
Recurring basis | Money market funds | Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total	43,930	36,617
Recurring basis | Corporate debt securities
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total	930	6,555
Recurring basis | Corporate debt securities | Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total	930	6,555
Recurring basis | Commercial paper
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total	36,191	53,598
Recurring basis | Commercial paper | Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total	$ 36,191	$ 53,598

Investments - Investments in fi

Investments - Investments in fixed income securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 41,020	$ 60,156
Gains		1
Losses	(2)	(4)
Fair Value	41,018	60,153
Corporate debt securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	930	6,556
Losses		(1)
Fair Value	930	6,555
U.S. Treasuries
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	3,897
Fair Value	3,897
Commercial paper
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	36,193	53,600
Gains		1
Losses	(2)	(3)
Fair Value	$ 36,191	$ 53,598

Investments - Balance sheet cla

Investments - Balance sheet classification of investments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Investments
Cash equivalents	$ 39,123	$ 59,156
Short-term investments	1,897	1,000
Total	$ 41,020	$ 60,156

Investments - Gross amortized c

Investments - Gross amortized cost and estimated fair value (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Gross Amortized Cost
Due in one year or less	$ 41,020	$ 60,156
Total	41,020	60,156
Fair Value
Due in one year or less	41,018	60,153
Total	$ 41,018	$ 60,153

Restructuring Expense (Details)

Restructuring Expense (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2019
Activity in accrued restructuring expense
Impairment of right-of-use assets		$ 1,328,000
Termination of certain employees and exit of an office facility
Activity in accrued restructuring expense
Accrued restructuring, beginning of the period	$ 1,047,000
Provision for restructuring charges		1,561,000
Cash payments	(441,000)	(955,000)
Accrued restructuring, end of the period	$ 606,000	606,000
Expected restructuring costs			$ 606,000
Impairment of right-of-use assets		1,300,000
Write-off of fixed assets		$ 170,000

Line of Credit (Details)

Line of Credit (Details) $ in Millions	1 Months Ended	9 Months Ended
	May 31, 2015USD ($)	Sep. 30, 2019USD ($)	Dec. 31, 2018USD ($)	Nov. 30, 2017USD ($)
Line Of Credit Facility [Line Items]
Revolving line of credit, maximum borrowing capacity		$ 20
Adjusted quick ratio		1.25
Line of Credit Facility, Remaining Borrowing Capacity				$ 15.5
Revolving line of credit amount outstanding		$ 0	$ 0
Prime rate
Line Of Credit Facility [Line Items]
Revolving line of credit, basis spread over variable rate		5.00%
Revolving line of credit
Line Of Credit Facility [Line Items]
Bank guarantee to customer				$ 3
Letter of credit
Line Of Credit Facility [Line Items]
Amount drawn from revolving line of credit	$ 1.5

Preferred Stock (Details)

Preferred Stock (Details) - shares	Sep. 30, 2019	Dec. 31, 2018
Preferred Stock
Convertible preferred stock, shares authorized	10,000,000	10,000,000
Convertible preferred stock, shares issued	0	0
Convertible preferred stock, shares outstanding	0	0

Common Stock (Details)

Common Stock (Details) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Common Stock
Common stock, shares authorized	300,000,000	300,000,000
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, voting rights	one	one

Common Stock - Shares of common

Common Stock - Shares of common stock reserved for issuance (Details) - shares	Sep. 30, 2019	Dec. 31, 2018
Options outstanding	2,929,095	4,496,557
Shares available for grant	1,365,303	2,337,545
Shares available for purchase/reserved for issuance	18,479,011	19,502,777
Restricted stock units
Unvested restricted stock units outstanding	13,806,088	12,303,913
2014 equity plan and 2015 inducement plan
Shares available for grant	1,365,303	2,337,545
2014 Employee Stock Purchase Plan/ESPP
Shares available for purchase/reserved for issuance	378,525	364,762

Common Stock - Repurchase Progr

Common Stock - Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Oct. 31, 2018
Common Stock
Common stock authorized to repurchase			$ 25,000
Common stock repurchased (in shares)	290,844	1,572,030
Average price (in dollars per share)	$ 6.99	$ 5.49
Total cost of common stock repurchased	$ 2,033	$ 8,624
Maximum remaining dollar value of shares yet to be purchased under the Repurchase Program	$ 12,500	$ 12,500

Share Based Awards (Details)

Share Based Awards (Details) - shares	Jan. 01, 2019	Sep. 30, 2019	Dec. 31, 2018	Jan. 05, 2016	Dec. 20, 2015
Share Based Compensation Arrangement By Share Based Payment Award
Options granted, exercisable term		4 years 5 months 23 days
Shares of common stock available for issuance		18,479,011	19,502,777
Additional shares authorized		5,310,327
ESPP
Share Based Compensation Arrangement By Share Based Payment Award
Maximum percentage of employee base compensation that may be utilized to purchase common stock under the ESPP		15.00%
Percentage of purchase price of common stock at fair market value		85.00%
2008 Stock Plan
Share Based Compensation Arrangement By Share Based Payment Award
Expiry term of exercisable options		10 years
2014 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award
Shares of common stock, authorized for issuance		8,142,857
Maximum annual percentage increase in shares issuable		5.00%
2014 Equity Incentive Plan | Incentive Stock Options
Share Based Compensation Arrangement By Share Based Payment Award
Additional shares authorized	5,310,327
Additional shares authorized as a percentage of common stock outstanding	5.00%
2015 Inducement Plan
Share Based Compensation Arrangement By Share Based Payment Award
Shares of common stock, authorized for issuance					1,600,000
Shares of common stock available for issuance				1,970,000
2015 Inducement Plan | Incentive Stock Options
Share Based Compensation Arrangement By Share Based Payment Award
Shares outstanding under the 2015 Inducement Plan		778,125
2015 Inducement Plan | Restricted stock units
Share Based Compensation Arrangement By Share Based Payment Award
Shares outstanding under the 2015 Inducement Plan		882,813
2014 Employee Stock Purchase Plan/ESPP
Share Based Compensation Arrangement By Share Based Payment Award
Shares of common stock available for issuance		378,525	364,762
Maximum annual percentage increase in shares issuable		1.00%
Additional shares authorized	1,062,065
Additional shares authorized as a percentage of common stock outstanding	1.00%
Maximum increase in shares issuable		2,142,857
2014 Employee Stock Purchase Plan/ESPP | ESPP
Share Based Compensation Arrangement By Share Based Payment Award
Shares of common stock available for issuance		378,525	364,762
Minimum | 2008 Stock Plan
Share Based Compensation Arrangement By Share Based Payment Award
Options granted, exercisable term		3 years
Maximum | 2008 Stock Plan
Share Based Compensation Arrangement By Share Based Payment Award
Options granted, exercisable term		4 years
Maximum | 2014 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award
Shares of common stock available for issuance		16,312,202

Share Based Awards - RSUs and B

Share Based Awards - RSUs and Bonus Plans (Details) - USD ($)	3 Months Ended				9 Months Ended
	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted					2,170,855
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Taxes paid for net settlement of stock-settled bonus					$ 5,492,000	$ 3,942,000
Stock-based compensation expense	$ 8,012,000		$ 9,380,000		$ 27,159,000	28,493,000
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested, Beginning Balance		12,303,913			12,303,913
Granted					9,738,871
Vested					(6,075,000)
Cancelled/Forfeited					(2,161,696)
Unvested, Ending Balance	13,806,088				13,806,088
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Unvested, Beginning Balance		$ 4.63			$ 4.63
Granted (in dollars per share)					5.45
Vested (in dollars per share)					4.75
Cancelled/Forfeited (in dollars per share)					4.71
Unvested, Ending Balance	$ 5.14				$ 5.14
Share withholding					1,064,577
2017 Bonus Plans
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Taxes paid for net settlement of stock-settled bonus				$ 3,700,000
Stock-based compensation expense						1,900,000
2017 Bonus Plans | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Common stock issued (in shares)				1,220,822
Share withholding				752,564
2018 Bonus Plan
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Taxes paid for net settlement of stock-settled bonus		$ 4,100,000
Stock-based compensation expense			$ 2,000,000		$ 1,100,000	$ 6,500,000
2018 Bonus Plan | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Common stock issued (in shares)		1,338,220
Share withholding		832,635
2019 Bonus Plan
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Stock-based compensation expense	$ 559,000				$ 5,500,000
Stock-based compensation expense, prior period catch up	$ 1,200,000

Share Based Awards - Options ac

Share Based Awards - Options activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Options Activity Rollforward
Number of Shares Available for Issuance, Beginning Balance		2,337,545
Options Outstanding, Number, Beginning Balance		4,496,557
Number of Shares Available for Issuance, Authorized		5,310,327
Number of Shares Available for Issuance, Granted	0	(125,000)
Options Outstanding, Shares Granted		125,000
Number of Shares Available for Issuance, other than Options granted		(2,170,855)
Options exercised		(1,337,433)
Number of Shares Available for Issuance, Cancelled		355,029
Number of Shares Available for Issuance, Ending Balance	1,365,303	1,365,303	2,337,545
Options Outstanding, Number, Ending Balance	2,929,095	2,929,095	4,496,557
Vested and exercisable- end of the period	2,374,402	2,374,402
Vested and expected to vest - end of the period	2,837,136	2,837,136
Options Activity, Weighted Average Exercise Price Rollforward
Options Outstanding, Weighted-Average Exercise Price, Beginning Balance		$ 5.02
Options Outstanding, Weighted Average Exercise Price Granted		4.52
Options Outstanding, Weighted Average Exercise Price Exercised		4.10
Options Outstanding, Weighted Average Exercise Price Cancelled		6.99
Options Outstanding, Weighted-Average Exercise Price, Ending Balance	$ 5.18	5.18	$ 5.02
Options Outstanding, Weighted-Average Exercise Price, Vested and exercisable	5.36	5.36
Options Outstanding, Weighted-Average Exercise Price, Vested and expected to vest	$ 5.21	$ 5.21
Options Outstanding, Weighted-Average Remaining Contractual Term (Years)		5 years 3 months 7 days	4 years 11 months 23 days
Options Outstanding, Weighted-Average Remaining Contractual Term Vested and exercisable (Years)		4 years 5 months 23 days
Options Outstanding, Weighted-Average Remaining Contractual Term Vested and expected to vest (Years)		5 years 1 month 28 days
Options Outstanding, Aggregate Intrinsic Value	$ 4,877	$ 4,877	$ 2,446
Options Outstanding, Vested and exercisable, Aggregate Intrinsic Value	3,703	3,703
Options Outstanding, Vested and expected to vest, Aggregate Intrinsic Value	$ 4,688	$ 4,688
RSUs, excluding Bonus Plans
Options Activity Rollforward
Number of Shares Available for Issuance, other than Options granted		(7,568,016)
Restricted stock units
Options Activity Rollforward
Number of Shares Available for Issuance, other than Options granted		(9,738,871)
Shares withheld for net settlement of equity awards (in shares)		1,064,577
Number of Shares Available for Issuance, Restricted stock units cancelled		2,161,696

Share Based Awards - Compensati

Share Based Awards - Compensation expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Allocation of employee service stock-based compensation expense
Stock-based compensation expense	$ 8,012	$ 9,380	$ 27,159	$ 28,493
Cost of revenue
Allocation of employee service stock-based compensation expense
Stock-based compensation expense	1,052	1,223	3,859	3,672
Research and development
Allocation of employee service stock-based compensation expense
Stock-based compensation expense	3,279	3,670	11,015	11,780
Sales and marketing
Allocation of employee service stock-based compensation expense
Stock-based compensation expense	2,029	2,653	6,367	7,341
General and administrative
Allocation of employee service stock-based compensation expense
Stock-based compensation expense	$ 1,652	$ 1,834	$ 5,918	$ 5,700

Share Based Awards - Options as

Share Based Awards - Options assumptions (Details) - shares	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
Risk-free interest rate (as a percent)	1.70%	2.50%
Expected volatility (as a percent)	40.00%	43.00%
Expected life (in years)	1 year 3 months 18 days	1 year 3 months 18 days
Options granted	0		125,000
Incentive Stock Options
Share Based Compensation Arrangement By Share Based Payment Award
Risk-free interest rate (as a percent)		2.80%	2.50%	2.70%
Expected volatility (as a percent)		50.00%	50.00%	52.00%
Expected life (in years)		6 years 1 month 6 days	6 years 1 month 6 days	6 years 1 month 6 days
ESPP
Share Based Compensation Arrangement By Share Based Payment Award
Risk-free interest rate (as a percent)			2.10%	2.20%
Expected volatility (as a percent)			41.00%	47.00%
Expected life (in years)			1 year 3 months 18 days	1 year 3 months 18 days

Share Based Awards - Unrecogniz

Share Based Awards - Unrecognized expense (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019USD ($)
Share Based Compensation Arrangement By Share Based Payment Award
Total, Unrecognized Stock-based Compensation Expense	$ 55.2
Incentive Stock Options
Share Based Compensation Arrangement By Share Based Payment Award
Total, Unrecognized Stock-based Compensation Expense	$ 0.9
Unrecognized stock-based compensation expense, Remaining Weighted-Average Recognition Period (in years)	2 years 8 months 12 days
Restricted stock units
Share Based Compensation Arrangement By Share Based Payment Award
Total, Unrecognized Stock-based Compensation Expense	$ 52.3
Unrecognized stock-based compensation expense, Remaining Weighted-Average Recognition Period (in years)	2 years 10 months 24 days
ESPP
Share Based Compensation Arrangement By Share Based Payment Award
Total, Unrecognized Stock-based Compensation Expense	$ 2
Unrecognized stock-based compensation expense, Remaining Weighted-Average Recognition Period (in years)	7 months 6 days

Employee Benefit Plan (Details)

Employee Benefit Plan (Details)	9 Months Ended
	Sep. 30, 2019USD ($)
Employee Benefit Plan
Age restriction of employees	21 years
Employee's contribution to plan 401(k) plan	$ 19,000
Catch up contribution limit for employees age 50 or older	$ 6,000
Minimum age of employees with catch up contribution limit	50 years
Employer contributions to date	$ 0

Commitments and Contingencies -

Commitments and Contingencies - Indemnification (Details)	9 Months Ended
	Sep. 30, 2019
Commitments and Contingencies
Refund term	3 years

Leases (Details)

Leases (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Leases
Options to extend the leases			true
Options to terminate			true
Termination term			1 year
Operating lease cost	$ 1.3	$ 1.7	$ 4.7	$ 5.1
Minimum
Leases
Remaining lease terms	1 year		1 year
Maximum
Leases
Remaining lease terms	5 years		5 years
Renewal term	5 years		5 years

Leases - Future maturities of l

Leases - Future maturities of lease liabilities (Details) $ in Thousands	Sep. 30, 2019USD ($)
Future maturities of lease liabilities
2019 (remaining)	$ 1,738
2020	6,071
2021	4,629
2022	3,261
2023	1,242
Thereafter	79
Total lease payments	17,020
Less: imputed interest	(1,327)
Total lease liability	$ 15,693

Leases - Weighted average remai

Leases - Weighted average remaining lease term and discount rate (Details)	Sep. 30, 2019
Leases
Weighted average discount rate	5.00%
Weighted average remaining lease term	36 months

Leases - Future minimum lease p

Leases - Future minimum lease payments for operating leases (Details) $ in Thousands	Dec. 31, 2018USD ($)
Future minimum lease payments for operating leases
2019	$ 7,144
2020	5,553
2021	4,083
2022	3,074
2023	1,163
Total	$ 21,017

Unearned Revenue - Changes in U

Unearned Revenue - Changes in Unearned Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Unearned Revenue
Balance, beginning of period	$ 106,399	$ 82,934	$ 105,837	$ 77,022
Billings, excluding billings for customer arrangements with termination rights	46,246	55,819	135,904	144,107
Additions to unearned revenue upon expiration of termination rights	(5,056)	(4,385)	(15,118)	(12,741)
Recognition of revenue, net of change in unbilled accounts receivable	(50,900)	(50,164)	(150,058)	(140,896)
Revenue billed as of the end of period	106,801	92,974	106,801	92,974
Increase (decrease) in total unbilled accounts receivable	1,301	(913)	1,090	(1,827)
Revenue Reported in Condensed Consolidated Statement of Operations	$ 52,201	$ 49,251	$ 151,148	$ 139,069

Unearned Revenue - Narratives (

Unearned Revenue - Narratives (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 117,400
Customer arrangements with termination rights	$ 16,246	$ 19,367
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Percentage of remaining performance obligation expected to be recognized in period	72.00%
Period of remaining performance obligation expected to be recognized	12 months

Segment and Disaggregated Rev_3

Segment and Disaggregated Revenue Information (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)segmentperson	Sep. 30, 2018USD ($)	Dec. 31, 2018USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of business activities | segment			1
Number of segment managers | person			0
Property and equipment-net	$ 5,529		$ 5,529		$ 7,046
Revenue	52,201	$ 49,251	151,148	$ 139,069
Recurring revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	44,820	39,670	129,098	110,381
Cloud services
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	17,591	13,199	49,163	36,181
On-premise subscriptions - point-in-time
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	5,964	6,337	17,394	15,332
On-premise subscriptions - ratable
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	4,902	4,121	13,872	11,956
Software support on perpetual licenses- ratable
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	16,363	16,013	48,669	46,912
Non-recurring revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	7,381	9,581	22,050	28,688
Perpetual license - point-in-time
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	6,252	8,669	18,420	25,995
Professional services - point-in-time
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	1,129	912	3,630	2,693
India | Net Property and Equipment | Geographic
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment-net	2,200		$ 2,200		$ 2,500
Concentration risk, percentage			40.00%		35.00%
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	23,376	21,654	$ 64,849	61,061
International
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 28,825	$ 27,597	$ 86,299	$ 78,008
Germany | Total revenue | Geographic
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	14.00%	17.00%	15.00%	16.00%
Revenue	$ 7,300	$ 8,600	$ 23,400	$ 22,800

Net Loss per Share (Details)

Net Loss per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net loss	$ (8,203)	$ (7,498)	$ (40,892)	$ (35,875)
Denominator:
Weighted-average shares used to compute basic and diluted net loss per share	110,831	104,032	109,147	101,369
Basic and diluted net loss per share	$ (0.07)	$ (0.07)	$ (0.37)	$ (0.35)

Net Loss Per Share - Antidiluti

Net Loss Per Share - Antidilutive (Details) - shares	Sep. 30, 2019	Sep. 30, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from net loss per share (shares)	17,429,417	18,848,933
Stock options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from net loss per share (shares)	2,929,095	5,122,470
Restricted stock units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from net loss per share (shares)	13,806,088	12,791,608
ESPP
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from net loss per share (shares)	194,622	194,366
Stock-settled bonus shares
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from net loss per share (shares)	499,612	740,489