Cornerstone OnDemand (CSOD) 10-Q 9 Nov 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Nov. 02, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Trading Symbol	CSOD
Entity Registrant Name	CORNERSTONE ONDEMAND INC
Entity Central Index Key	1,401,680
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		58,612,222
Entity Emerging Growth Company	false
Entity Small Business	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands		Sep. 30, 2018	[2]	Dec. 31, 2017
Assets
Cash and cash equivalents	[1]	$ 136,558		$ 393,576
Short-term investments		254,439		169,551
Accounts receivable, net		97,439		154,428
Deferred commissions, current portion		24,880		42,806
Prepaid expenses and other current assets		31,558		21,754
Total current assets		544,874		782,115
Capitalized software development costs, net		43,826		37,431
Property and equipment, net		24,647		20,817
Deferred commissions, net of current portion		37,313		0
Long-term investments		2,000		96,949
Intangible assets, net		7,292		0
Goodwill		36,270		25,894
Other assets, net		3,539		3,984
Total Assets		699,761		967,190
Liabilities:
Accounts payable		11,294		17,637
Accrued expenses		61,346		57,528
Deferred revenue, current portion		266,209		311,997
Convertible notes, net		0		248,025
Other liabilities		4,377		9,051
Total current liabilities		343,226		644,238
Convertible notes, net		287,956		285,168
Other liabilities, non-current		2,416		1,498
Deferred revenue, net of current portion		11,744		14,166
Total liabilities		645,342		945,070
Commitments and contingencies (Note 12)
Stockholders’ Equity:
Common stock, $0.0001 par value; 1,000,000 shares authorized, 58,812 and 57,512 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively		6		6
Additional paid-in capital		580,690		536,951
Accumulated deficit		(526,789)		(515,054)
Accumulated other comprehensive income		512		217
Total stockholders’ equity		54,419		22,120
Total Liabilities and Stockholders’ Equity		$ 699,761		$ 967,190
[1]	See Note 1 for additional information.
[2]	See Note 1 for summary of adjustments.

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2018	[1]	Dec. 31, 2017
Statement of Financial Position [Abstract]
Common stock, par value (USD per share)	$ 0.0001		$ 0.0001
Common stock, shares authorized (in shares)	1,000,000,000		1,000,000,000
Common stock, shares issued (in shares)	58,812,000		57,512,000
Common stock, shares outstanding (in shares)	58,812,000		57,512,000
[1]	See Note 1 for summary of adjustments.

Condensed Consolidated Statemen

Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018	[1]	Sep. 30, 2017	Sep. 30, 2018	[1]	Sep. 30, 2017
Income Statement [Abstract]
Revenue	$ 134,014		$ 121,796	$ 399,644		$ 350,029
Cost of revenue	36,171		35,708	109,556		104,978
Gross profit	97,843		86,088	290,088		245,051
Operating expenses:
Sales and marketing	53,215		60,554	172,281		179,521
Research and development	19,705		16,389	52,014		44,484
General and administrative	23,128		21,249	67,214		64,866
Restructuring	221		0	8,946		0
Total operating expenses	96,269		98,192	300,455		288,871
Income (loss) from operations	1,574		(12,104)	(10,367)		(43,820)
Other income (expense):
Interest income	1,659		749	6,143		2,021
Interest expense	(5,335)		(3,373)	(22,826)		(10,015)
Other, net	177		376	(2,029)		921
Other income (expense), net	(3,499)		(2,248)	(18,712)		(7,073)
Loss before income tax provision	(1,925)		(14,352)	(29,079)		(50,893)
Income tax provision	(522)		(503)	(1,591)		(1,438)
Net loss	$ (2,447)	[2]	$ (14,855)	$ (30,670)	[2],[3]	$ (52,331)
Net loss per share, basic and diluted (USD per share)	$ (0.04)		$ (0.26)	$ (0.53)		$ (0.92)
Weighted average common shares outstanding, basic and diluted (in shares)	58,699		57,627	57,994		57,072
[1]	See Note 1 for summary of adjustments.
[2]	See Note 1 for summary of adjustments.
[3]	See Note 1 for additional information.

Condensed Consolidated Statem_2

Condensed Consolidated Statements Of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018	[2]	Sep. 30, 2017	Sep. 30, 2018	[2]	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (2,447)	[1]	$ (14,855)	$ (30,670)	[1],[3]	$ (52,331)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	33		(1,490)	36		(3,540)
Net change in unrealized gains (losses) on investments	202		70	259		2
Other comprehensive income (loss), net of tax	235		(1,420)	295		(3,538)
Total comprehensive loss	$ (2,212)		$ (16,275)	$ (30,375)		$ (55,869)
[1]	See Note 1 for summary of adjustments.
[2]	See Note 1 for summary of adjustments.
[3]	See Note 1 for additional information.

Condensed Consolidated Statem_3

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	[1]	Sep. 30, 2017
Cash flows from operating activities:
Net loss	$ (30,670)	[2],[3]	$ (52,331)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	25,351		27,028
Accretion of debt discount and amortization of debt issuance costs	7,918		7,148
Purchased investment premium, net of amortization	428		527
Net foreign currency gain	(522)		(1,368)
Stock-based compensation expense	51,042		51,029
Changes in operating assets and liabilities:
Accounts receivable	55,757		14,631
Deferred commissions	(7,104)		(357)
Prepaid expenses and other assets	(9,492)		(4,033)
Accounts payable	(6,258)		(8,276)
Accrued expenses	21		(2,107)
Deferred revenue	(38,695)		(16,323)
Other liabilities	(2,511)		359
Net cash provided by operating activities	45,265		15,927
Cash flows from investing activities:
Purchases of investments	(125,109)		(231,384)
Maturities of investments	135,183		219,846
Capital expenditures	(10,161)		(6,682)
Capitalized software costs	(18,943)		(15,826)
Cash paid for acquisition, net of cash acquired	(18,093)		0
Net cash used in investing activities	(37,123)		(34,046)
Cash flows from financing activities:
Payments of debt issuance costs	(152)		0
Repayment of convertible notes	(253,000)		0
Proceeds from employee stock plans	43,474		9,722
Repurchases of common stock	(54,751)		0
Net cash (used in) provided by financing activities	(264,429)		9,722
Effect of exchange rate changes on cash and cash equivalents	(731)		1,530
Net decrease in cash and cash equivalents	(257,018)		(6,867)
Cash and cash equivalents at beginning of period	393,576		83,300
Cash and cash equivalents at end of period	136,558	[4]	76,433
Supplemental cash flow information:
Cash paid for interest	13,628		3,841
Cash paid for income taxes	1,573		1,800
Proceeds from employee stock plans received in advance of stock issuance	2,152		1,998
Non-cash investing and financing activities:
Assets acquired under capital leases and other financing arrangements	970		3,467
Capitalized assets financed by accounts payable and accrued expenses	2,796		631
Capitalized stock-based compensation	$ 3,747		$ 3,721
[1]	See Note 1 for additional information.
[2]	See Note 1 for summary of adjustments.
[3]	See Note 1 for summary of adjustments.
[4]	See Note 1 for summary of adjustments.

Organization And Summary Of Sig

Organization And Summary Of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization And Summary Of Significant Accounting Policies	ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Company Overview Cornerstone OnDemand, Inc. (“Cornerstone” or the “Company”) was incorporated on May 24, 1999 in the state of Delaware and began its principal operations in November 1999 . The Company is a leading global provider of learning and human capital management software, delivered as Software-as-a-Service (“SaaS”). The Company helps organizations around the globe recruit, train and manage their employees. It is one of the world’s largest cloud computing companies. The Company’s human capital management platform combines the world’s leading unified talent management solutions with state-of-the-art analytics and HR administration solutions to enable organizations to manage the entire employee lifecycle. Its focus on continuous learning and development helps organizations to empower employees to realize their potential and drive success. The Company works with clients across all geographies, verticals and market segments. Its Recruiting, Learning, Performance and HR Administration suites help with sourcing, recruiting and onboarding new hires; managing training and development requirements; nurturing knowledge sharing and collaboration among employees; goal setting, reviews, competency management and continuous feedback; linking compensation to performance; identifying development plans based on performance gaps; streamlining employee data management, self-service and compliance reporting; and then utilizing state-of-the-art analytics capabilities to make smarter, more-informed decisions using data from across the platform for talent mobility, engagement and development so that HR and leadership can focus on strategic initiatives to help their organization succeed. The Company’s management has determined that the Company operates in one segment as it only reports financial information on an aggregate and consolidated basis to the Company’s chief executive officer, who is the Company’s chief operating decision maker. Office Locations The Company is headquartered in Santa Monica, California and has offices in Amsterdam, Netherlands; Auckland, New Zealand; Bangalore, India; Düsseldorf, Germany; Hong Kong; London, United Kingdom; Madrid, Spain; Mumbai, India; Munich, Germany; Paris, France; São Paulo, Brazil; Stockholm, Sweden; Sunnyvale, United States; Sydney, Australia; Tel Aviv, Israel; and Tokyo, Japan. Basis of Presentation The accompanying unaudited condensed consolidated financial statements are presented in accordance with (i) accounting standards generally accepted in the United States of America (“GAAP”) for interim financial information and (ii) the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, such financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, the financial statements include all adjustments (consisting of normal recurring adjustments) necessary for the fair presentation of the interim periods presented. Results for the three and nine months ended September 30, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018 , for any other interim period or for any other future year. The condensed consolidated balance sheet at December 31, 2017 has been derived from the audited financial statements at that date, but does not include all of the disclosures required by GAAP. The Company’s significant accounting policies are described in “Note 2. Summary of Significant Accounting Policies” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 . The Company follows the same accounting policies for interim reporting. The financial information included in this Quarterly Report on Form 10-Q should be read in conjunction with the Company’s consolidated financial statements and related notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 . Effective January 1, 2018, the Company adopted the requirements of Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers , as discussed further in Note 1. All amounts and disclosures set forth in this Quarterly Report on Form 10-Q have been updated to comply with this new standard with results for reporting periods beginning after January 1, 2018 presented under ASU No. 2014-09, while prior period amounts are not adjusted and continue to be reported under the accounting standards in effect for the prior period. Recently Adopted Accounting Pronouncements In June 2018, the Financial Accounting Standards Board (“FASB”) issued a new ASU, which aligns the accounting for share-based compensation for non-employees with employees. The guidance is effective for interim and annual reporting periods beginning after December 15, 2018. The Company early adopted this ASU in the second quarter of 2018, and the adoption did not have a material impact on its financial statements. In May 2017, the FASB issued a new ASU, which amends the scope of modification accounting for share-based payment arrangements. It provides guidance on the types of changes to the terms or conditions of share-based payment awards to which an entity would be required to apply modification accounting under Accounting Standards Codification (“ASC”) 718, Compensation - Stock compensation . The Company implemented this requirement as of the beginning of the first quarter of 2018. The adoption did not have a material impact on its financial statements. In January 2017, the FASB issued a new ASU, which clarifies the definition of a business, which affects many areas of accounting including acquisitions, disposals, goodwill and consolidation. The Company implemented this requirement as of the beginning of the first quarter of 2018. The adoption did not have a material impact on its financial statements. In August 2016, the FASB issued a new ASU to clarify how companies present and classify certain cash receipts and cash payments in the statement of cash flows. The Company implemented this requirement as of the beginning of the first quarter of 2018. The adoption did not have a material impact on its financial statements. In January 2016, the FASB issued a new ASU that provides guidance for the recognition, measurement, presentation and disclosure of financial assets and liabilities. The Company implemented this requirement as of the beginning of the first quarter of 2018. The adoption did not have a material impact on its financial statements. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (“Topic 606”) . Topic 606 supersedes the revenue recognition requirement in ASC Topic 605 , Revenue Recognition (“Topic 605”) , and requires the recognition of revenue to depict the transfer of promised goods or services to customers in an amount that reflects the expected consideration entitled in exchange for those goods or services. Topic 606 also includes Subtopic 340-40, Other Assets and Deferred Costs - Contracts with Customers , which requires the deferral of incremental costs of obtaining a contract with a customer. The Company adopted the requirements of Topic 606 utilizing the modified retrospective method of transition to contracts as of January 1, 2018. The accumulated deficit balance was reduced, thus stockholders' equity was increased by $18.9 million as of January 1, 2018 due to the cumulative impact of adopting Topic 606. The impact was primarily related to: • $15.5 million increase in deferred commissions. Such costs are considered to be costs to acquire a contract under Topic 606, and primarily relate to the execution of software subscription contracts. In addition, upon adoption, these incremental commission costs to obtain a contract are now amortized over a period of benefit, which is generally six years. • $2.7 million of additional liability offsets the impact to retained earnings from the increase of the deferred commission above. The liability is to accrue commission costs earned but not yet paid. • $6.1 million reduction in deferred revenue related to additional contract value being allocated to professional services delivered prior to adoption. Previously such amounts were not recognized based on contractual payment limitations. Upon adoption, revenue for professional services is based on the relative standalone selling price without any such limitation. The adoption had no impact to net cash provided by or used in operating, investing or financing activities in the Company’s Condensed Consolidated Statements of Cash Flows. Recent Accounting Pronouncements In February 2016, the FASB issued a new ASU, that was updated in 2018, amends a number of aspects of lease accounting, including requiring lessees to recognize operating leases with a term greater than one year on their balance sheet as a right-of-use asset and corresponding lease liability, measured at the present value of the lease payments. This guidance is effective for the Company’s interim and annual reporting periods beginning January 1, 2019. Upon adoption, the Company expects to recognize additional assets and related lease liabilities on the consolidated balance sheets. The Company is currently evaluating the impact of the adoption of this ASU on its financial statements. In June 2016, the FASB issued a new ASU, which requires the measurement and recognition of expected credit losses for financial assets held at amortized cost. This guidance replaces the existing incurred loss impairment model with an expected loss methodology, which will result in more timely recognition of credit losses. This ASU is effective for annual reporting periods, and interim periods within those years, beginning after December 15, 2019, and requires a cumulative effect adjustment to the balance sheet as of the beginning of the first reporting period in which the guidance is effective. The Company is currently in the process of evaluating the impact of the adoption of this ASU on its consolidated financial statements. In January 2017, The FASB issued a new ASU which simplifies the accounting for goodwill impairments by eliminating step 2 from the goodwill impairment test. Instead, if the carrying amount of a reporting unit exceeds its fair value, an impairment loss shall be recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit. This ASU will be applied prospectively and is effective for annual reporting periods, and interim periods within those years, beginning after December 15, 2019. The Company is currently currently in the process of evaluating the impact of the adoption of ASU on its consolidated financial statements. In March 2018, the FASB issued a new ASU, which aligns the accounting for implementation costs incurred in a hosting arrangement that is a service contract with the accounting for implementation costs incurred to develop or obtain internal-use software under ASC 350-40, in order to determine which costs to capitalize and recognize as an asset. This guidance is effective for annual reporting periods, and interim periods within those years, beginning after December 15, 2019, and can be applied either prospectively to implementation costs incurred after the date of adoption or retrospectively to all arrangements. The Company is currently in the process of evaluating the impact of the adoption of this ASU on its consolidated financial statements. In August 2018, the SEC issued a final rule that amends certain of its disclosure requirements. The changes are generally intended to reduce or eliminate certain disclosures that have become redundant, duplicative, overlapping, outdated or superseded in light of other disclosure requirements or changes in the information environment. The rule also requires SEC registrants to present changes in stockholders' equity and the amount of dividends per share for each class of shares on a quarterly basis for the current and prior-year periods. The final rule is effective for SEC filings made on or after November 2, 2018. In August 2018, the FASB issued a new ASU that provides additional guidance on the accounting for costs of implementation activities performed in a cloud computing arrangement that is a service contract. The amendments in this update also provide additional disclosure requirements to disclose the nature of an entity's hosting arrangements that are service contracts. This ASU is effective for annual and interim periods beginning after December 15, 2019. The Company is evaluating the impact of the adoption of this ASU on its consolidated financial statements. Summary of Significant Accounting Policies Except for changes to the Company's revenue recognition policy and the accounting for commission payments, there have been no changes to the Company’s significant accounting policies described in the Annual Report on Form 10-K for the year ended December 31, 2017, filed with the SEC on February 27, 2018. See below for additional accounting policy and transition disclosures. Revenue Recognition Effective January 1, 2018, the Company adopted the guidance under Topic 606. The Company derives its revenue from the following sources: Subscriptions to the Company’s products and other offerings on a recurring basis Clients pay subscription fees for access to the Company’s enterprise human capital management platform, other products and support on a recurring basis. Fees are based on a number of factors, including the number of products purchased, which may include e-learning content, and the number of users having access to a product. The Company generally recognizes revenue from subscriptions ratably over the term of the agreements beginning on the date the subscription service is made available to the client. Subscription agreements are typically three years, billed annually in advance, and non-cancelable, with payment due within 30 days of the invoice date. Professional services and other The Company offers its clients and implementation partners assistance in implementing its products and optimizing their use. Professional services include application configuration, system integration, business process re-engineering, change management and training services. Services are generally billed up-front on a fixed fee basis and to a lesser degree on a time-and-material basis. These services are generally purchased as part of a subscription arrangement and are typically performed within the first several months of the arrangement. Clients may also purchase professional services at any other time. The Company generally recognizes revenue from fixed fee professional services contracts as services are performed based on the proportion performed to date relative to the total expected services to be performed. Revenue associated with time-and-material contracts are recorded as such time-and-materials are incurred. The Company recognizes revenue from contracts with customers based on the following five steps: 1) Identification of the contract, or contracts, with a customer 2) Identification of all performance obligations in the contract 3) Determination of the transaction price 4) Allocation of the transaction price to the performance obligations in the contract 5) Recognition of revenue as we satisfy a performance obligation The Company identifies enforceable contracts with a customer when the agreement is signed. The Company accounts for individual performance obligations separately if they are distinct. The transaction price is generally based on fixed fees stated in the contract. The Company excludes from the transaction price any amounts relating to taxes from product sales which are collected from customers and remitted to governmental authorities. If the contract contains a single performance obligation, the entire transaction price is allocated to the single performance obligation. Contracts that contain multiple performance obligations require an allocation of the transaction price to each performance obligation based on a relative standalone selling price basis. The Company is not able to directly observe a standalone selling price for its performance obligations, as the performance obligations are sold separately and within a sufficiently narrow price range only infrequently, and because management has determined that there are no third-party offerings reasonably comparable to the Company’s products. Accordingly, total contract values are allocated to subscriptions to the products and professional services based on the standalone selling price (“SSP”). The determination of SSP requires the Company to make significant estimates and judgments. The Company considers numerous factors, including the nature and complexity of the performance obligations themselves; the geography, market conditions and competitive landscape for the sale; internal costs; and pricing and discounting practices. The Company updates its estimates of SSP on an ongoing basis through internal periodic reviews and as events or circumstances may require. Revenue is recognized at the time the related performance obligation is satisfied by transferring a promised service to a customer. The Company satisfies performance obligations over time. In a limited number of cases, the client’s intended use of a product requires contractually specified enhancements to its underlying features and functionality. In some of these cases, revenue is recognized as a combined single performance obligation on a straight-line basis from the point at which access to the enhanced product(s) have been provided, through the remaining term of the agreement. In other cases where the enhancement is not contractually specified by the customer for its initial use and revenue is recognized separately for the enhancement and the product as a second distinct performance obligation. In such cases where a second performance obligation exists, the enhancement revenue is recognized based on a SSP allocation on a straight-line basis once access to the enhancement has been provided, through the remaining term of the agreement. For arrangements in which the Company resells third-party e-learning training content to clients, revenue is recognized in accordance with accounting guidance as to when to report gross revenue as a principal or report net revenue as an agent. The Company typically recognizes third-party content revenue at the gross amount invoiced to clients as (i) the Company is primarily responsible for hosting the content on our platform for the term of the agreement, (ii) the Company controls the content before access is provided to the customer, and (iii) the Company typically has discretion to establish the price charged. Deferred Revenue The Company records amounts that have been invoiced to its clients in accounts receivable and in either deferred revenue or revenue depending on whether the revenue recognition criteria described above have been met. Deferred revenue that will be recognized during the succeeding twelve-month period from the respective balance sheet date is recorded as current deferred revenue and the remaining portion is recorded as noncurrent. The decrease in the deferred revenue balance for the nine months ended September 30, 2018 is primarily driven by $271.7 million of revenue recognized that were included in the deferred revenue balances as of January 1, 2018 offset by invoices billed in advance of satisfying performance obligations in accordance with contract payment terms. Transaction Price Allocated to Remaining Performance Obligations As of September 30, 2018 , approximately $837.0 million of revenue is expected to be recognized from remaining performance obligations. This amount mainly comprises subscription revenue, with less than 10% attributable to professional services and other revenue. The Company expects to recognize revenue on approximately two thirds of these remaining performance obligations over the next 18 months , with the balance recognized thereafter. The estimated revenues from the remaining performance obligations do not include uncommitted contract amounts such as (i) amounts which are cancelable by the client without any significant penalty, (ii) future billings for time and material contracts, and (iii) amounts associated with optional renewal periods. Commission Payments The Company defers commissions paid to its sales force and related payroll taxes as these amounts are incremental costs of obtaining a contract with a customer and are recoverable from future revenue due to the non-cancelable client agreements that gave rise to the commissions. Commissions for initial contracts are deferred on the balance sheet and amortized on a straight-line basis over a period of benefit that has been determined to be six years. The Company took into consideration technology and other factors in estimating the benefit period. Sales commissions for renewal contracts are deferred and amortized on a straight-line basis over the related contract renewal period. Amortization expense is included in sales and marketing expenses in the accompanying condensed consolidated statements of operations. For the three and nine months ended September 30, 2018 , the amount of amortization expense was $8.0 million and $25.8 million , respectively, and there was no impairment loss in relation to the costs capitalized. Impact of New Standard on Financial Statement Line Items The following tables summarize the effect of the adoption of Topic 606 on the Company’s select line items, included in the unaudited consolidated condensed financial statements as of and for the quarter ended September 30, 2018 , as if the previous accounting was in effect (in thousands). September 30, 2018 Condensed Consolidated Balance Sheet As Reported Impacts of Adoption Without Adoption Assets Deferred commissions, current portion $ 24,880 $ 19,317 $ 44,197 Deferred commissions, non-current 37,313 (37,313 ) — Liabilities Accrued expenses 61,346 (2,333 ) 59,013 Deferred revenue, current portion 266,209 6,374 272,583 Stockholders’ Equity Accumulated deficit (526,789 ) (22,037 ) (548,826 ) Three Months Ended Nine Months Ended September 30, 2018 September 30, 2018 Condensed Consolidated Statement of Operations As Reported Impacts of Adoption Without Adoption As Reported Impacts of Adoption Without Adoption Revenue $ 134,014 $ (349 ) $ 133,665 $ 399,644 $ (314 ) $ 399,330 Operating expenses: Sales and marketing 53,215 (1,050 ) 52,165 172,281 (950 ) 171,331 Net loss (2,447 ) 701 (1,746 ) (30,670 ) 636 (30,034 ) Net loss per share, basic and diluted (0.04 ) (0.03 ) (0.53 ) (0.52 ) Weighted average common shares outstanding, basic and diluted 58,699 58,699 57,994 57,994 The adoption of Topic 606 had no impact to net cash provided by or used in operating, investing or financing activities in the Company’s unaudited condensed statement of cash flows for the nine months ended September 30, 2018 .

Business Acquisition

Business Acquisition	9 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
Business Acquisition	BUSINESS ACQUISITION On September 10, 2018, the Company completed the acquisition of Workpop Inc. (“Workpop”), a privately held company. Workpop is a robust web and mobile solution for candidates and hiring managers in service-based industries. The acquisition was completed pursuant to a merger whereby Workpop became a wholly-owned subsidiary of the Company. In connection with the merger, the Company paid cash consideration of approximately $18.2 million . The Company had a $0.5 million cost basis investment in Workpop prior to the acquisition. As part of the acquisition of Workpop, the Company received a return of our investment with an insignificant loss, which is included in general and administrative expenses in the consolidated statement of operations. The acquisition has been accounted for under the acquisition method of accounting for business combinations with the Company as the accounting acquirer in accordance with ASC 805, Business Combinations . As such, the Workpop assets acquired and liabilities assumed are recorded at their acquisition-date fair values. Acquisition-related transaction costs of $0.4 million are not included as a component of consideration transferred, but are accounted for as an expense in the period in which the costs are incurred. Accordingly, these acquisition-related transaction costs have been included in general and administrative expenses in the consolidated statement of operations. Any excess of the acquisition consideration over the fair value of assets acquired and liabilities assumed is allocated to goodwill. Goodwill is attributable primarily to expected benefits, including the acquired workforce, from combining Workpop with the Company. The Company acquired Workpop to leverage and develop new web and mobile recruiting products as part of the Cornerstone Recruiting suite. The Company’s allocation of the total purchase price consideration as of September 10, 2018 is summarized below (in thousands): Fair Value Cash and cash equivalents $ 115 Other assets 68 Intangible assets - developed technology 7,500 Goodwill 10,525 Total purchase price $ 18,208 The fair value of the developed technology is being amortized on a straight-line basis over 3 years , which is the expected useful life of such asset. Pro forma results of operations have not been presented because the effects of this acquisition is not material to our financial results.

Net Loss Per Share

Net Loss Per Share	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Net Loss Per Share	NET LOSS PER SHARE The following table presents the Company’s basic and diluted net loss per share (in thousands, except per share amounts): Three Months Ended Nine Months Ended September 30, September 30, 2018 2017 2018 2017 Net loss $ (2,447 ) $ (14,855 ) $ (30,670 ) $ (52,331 ) Weighted-average shares of common stock outstanding 58,699 57,627 57,994 57,072 Net loss per share – basic and diluted $ (0.04 ) $ (0.26 ) $ (0.53 ) $ (0.92 ) The potential shares of common stock that would have a dilutive impact are computed using the treasury stock method or the if-converted method, as applicable. At September 30, 2018 and 2017 , the following potential shares were excluded from the computation of diluted net loss per share because their effect would have been anti-dilutive (in thousands): September 30, 2018 2017 Options to purchase common stock, restricted stock units and performance-based restricted stock units 10,575 11,112 Shares issuable pursuant to employee stock purchase plan 89 98 Convertible notes 7,143 4,682 Common stock warrants 4,682 4,682 Total shares excluded from net loss per share 22,489 20,574

Investments

Investments	9 Months Ended
	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Investments	INVESTMENTS Investments in Marketable Securities The Company’s investments in available-for-sale marketable securities are made pursuant to its investment policy, which has established guidelines relative to the diversification of the Company’s investments and their maturities, with the principal objective of capital preservation and maintaining liquidity that is sufficient to meet cash flow requirements. The following is a summary of investments in marketable securities, including those that meet the definition of a cash equivalent, as of September 30, 2018 (in thousands): September 30, 2018 Amortized Cost Basis Unrealized Gains Unrealized Losses Fair Value Cash Equivalent Investments Money market funds $ 93,789 $ — $ — $ 93,789 $ 93,789 $ — Certificate of deposit 10,000 — — 10,000 10,000 — Corporate bonds 67,614 5 (121 ) 67,498 — 67,498 U.S. treasury securities 187,217 — (276 ) 186,941 — 186,941 $ 358,620 $ 5 $ (397 ) $ 358,228 $ 103,789 $ 254,439 The following is a summary of investments in marketable securities, including those that meet the definition of a cash equivalent, as of December 31, 2017 (in thousands): December 31, 2017 Amortized Cost Basis Unrealized Gains Unrealized Losses Fair Value Cash Equivalent Investments Money market funds $ 358,859 $ — $ — $ 358,859 $ 358,859 $ — Certificate of deposit 10,000 — — 10,000 10,000 — Corporate bonds 74,868 — (220 ) 74,648 — 74,648 U.S. treasury securities 189,310 — (430 ) 188,880 — 188,880 $ 633,037 $ — $ (650 ) $ 632,387 $ 368,859 $ 263,528 As of September 30, 2018 , the Company’s investment in corporate bonds, agency bonds and U.S. treasury securities had a weighted-average maturity date of approximately six months . Unrealized gains and losses on investments were not significant and the Company does not believe the unrealized losses represent other-than-temporary impairments as of September 30, 2018 and December 31, 2017 . No marketable securities held have been in a continuous unrealized loss position for more than 12 months as of September 30, 2018 and December 31, 2017 . Strategic Investments As of September 30, 2018 , the Company had aggregate strategic investments of $2.0 million . The Company accounted for each of these investments using the cost method of accounting, as the Company does not have significant influence or a controlling financial interest over these entities. During the three and nine months ended September 30, 2018 , the Company sold $0.5 million and $1.0 million , respectively, of its strategic investments at approximately their carrying value. The 0.5 million return on investment received during the three and nine months ended September 30, 2018 , was received as part of our acquisition of Workpop. These investments are subject to periodic impairment reviews and are considered to be impaired when a decline in fair value is judged to be other-than-temporary. Other than the impairment loss of $0.6 million during the nine months ended September 30, 2017 , there have no t been any other impairment losses recorded.

Intangible Assets And Goodwill

Intangible Assets And Goodwill	9 Months Ended
	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets And Goodwill	INTANGIBLE ASSETS AND GOODWILL Finite-lived Intangibles The Company has finite-lived intangible assets which are amortized over their estimated useful lives on a straight line basis. The following table presents the gross carrying amount and accumulated amortization of finite-lived intangible assets as of September 30, 2018 and December 31, 2017 (in thousands): September 30, 2018 December 31, 2017 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Developed technology $ 7,500 $ (208 ) $ 7,292 $ 29,984 $ (29,984 ) $ — Software license rights — — — 1,654 (1,654 ) — $ 7,500 $ (208 ) $ 7,292 $ 31,638 $ (31,638 ) $ — In September 2018, the Company recorded additional finite-lived intangible assets totaling $7.5 million , related to developed technology from the acquisition of Workpop (see Note 2). Total amortization expense from finite-lived intangible assets was $0.2 million for the three and nine months ended September 30, 2018 and $2.2 million and $6.6 million for the three and nine months ended September 30, 2017 , respectively, and was recorded in cost of revenue in the accompanying Consolidated Statements of Operations. The following table presents the Company’s estimate of remaining amortization expense, which will be recorded in cost of revenue, for each of the succeeding fiscal years ending December 31 for finite-lived intangible assets that existed at September 30, 2018 (in thousands): Remainder of 2018 $ 625 2019 2,500 2020 2,500 2021 1,667 Total future amortization $ 7,292 The Company evaluates the recoverability of its long-lived assets with finite useful lives, including intangible assets, for impairment whenever events or changes in circumstances indicate that the carrying amounts may not be recoverable. Based on the assessment of various factors in connection with the preparation of the Company’s financial statements for the three months ended September 30, 2018 , the Company does not believe there were any negative qualitative factors impacting the recoverability of the carrying values. There were no impairment charges related to identifiable intangible assets in the nine months ended September 30, 2018 and the year ended December 31, 2017 . Goodwill The following table presents the changes in the carrying amount of goodwill for the nine months ended September 30, 2018 and the year ended December 31, 2017 (in thousands): Goodwill as of December 31, 2017 $ 25,894 Goodwill from Workpop acquisition 10,376 Goodwill as of September 30, 2018 $ 36,270

Fair Value Of Financial Instrum

Fair Value Of Financial Instruments	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Of Financial Instruments	FAIR VALUE OF FINANCIAL INSTRUMENTS Fair value represents the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. Observable inputs are based on market data obtained from independent sources. The fair value hierarchy is based on the following three levels of inputs, of which the first two are considered observable and the last one is considered unobservable: • Level 1 – Quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date. • Level 2 – Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly. • Level 3 – Unobservable inputs. Assets and liabilities measured at fair value on a recurring basis included the following as of September 30, 2018 and December 31, 2017 (in thousands): September 30, 2018 December 31, 2017 Fair Value Level 1 Level 2 Level 3 Fair Value Level 1 Level 2 Level 3 Cash equivalents $ 103,789 $ 93,789 $ 10,000 $ — $ 368,859 $ 358,859 $ 10,000 $ — Corporate bonds 67,498 — 67,498 — 74,648 — 74,648 — U.S. treasury securities 186,941 — 186,941 — 188,880 — 188,880 — $ 358,228 $ 93,789 $ 264,439 $ — $ 632,387 $ 358,859 $ 273,528 $ — At September 30, 2018 and December 31, 2017 , cash equivalents of $93.8 million and $358.9 million , respectively, consisted of money market funds with original maturity dates of three months or less backed by U.S. Treasury bills. At September 30, 2018 and December 31, 2017 , cash equivalents of $10.0 million and $10.0 million , respectively, consisted of certificate of deposits with original maturity dates of three months or less. As of September 30, 2018 , corporate bonds, agency bonds, U.S. treasury securities and commercial paper were classified within Level 2 of the fair value hierarchy. The bonds were valued using information obtained from pricing services, which obtained quoted market prices from a variety of industry data providers, security master files from large financial institutions, and other third-party sources. The Company performed supplemental analysis to validate information obtained from its pricing services. As of September 30, 2018 , no adjustments were made to such pricing information. Convertible Notes The Company’s 2021 Notes described below, are shown in the accompanying Condensed Consolidated Balance Sheets at their original issuance value, net of unamortized discount and debt issuance costs, and are not remeasured to fair value each period. The approximate fair value of the Company’s 2021 Notes as of September 30, 2018 was $370.0 million . The fair value of the 2021 Notes was estimated on the basis of quoted market prices of similar instruments, which, due to the lack of trading activity, are considered Level 2 in the fair value hierarchy.

Debt

Debt	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Debt	DEBT 2018 Convertible Notes In 2013, the Company issued convertible notes (the “2018 Notes”) raising gross proceeds of $253.0 million . On July 1, 2018, the 2018 Notes matured and the $253.0 million principal amount due was repaid. The 2018 Notes are no longer outstanding. The 2018 Notes were governed by an Indenture, dated June 17, 2013, between the Company and U.S. Bank National Association, as trustee (the “2013 Indenture”). The 2018 Notes matured on July 1, 2018 and bore interest at a rate of 1.50% per year payable semi-annually in arrears on January 1 and July 1 of each year, commencing January 1, 2014. In accounting for the 2018 Notes at issuance, the Company separated the 2018 Notes into debt and equity components pursuant to the accounting standards for convertible debt instruments that may be fully or partially settled in cash upon conversion. The fair value of the debt component was estimated using an interest rate for nonconvertible debt, with terms similar to the 2018 Notes, excluding the conversion feature. The excess of the principal amount of the 2018 Notes over the fair value of the debt component was recorded as a debt discount and a corresponding increase in additional paid-in capital. The debt discount was accreted to interest expense over the term of the 2018 Notes using the interest method. The amount recorded to additional paid-in capital was not remeasured since it met the conditions for equity classification over the term of the 2018 Notes. Upon issuance of the $253.0 million of 2018 Notes, the Company recorded $214.3 million to debt and $38.7 million to additional paid-in capital for the debt discount. The Company incurred transaction costs of approximately $7.3 million related to the issuance of the 2018 Notes. In accounting for these costs, the Company allocated the costs to the debt and equity components in proportion to the allocation of proceeds from the issuance of the 2018 Notes to such components. Transaction costs allocated to the debt component of $6.2 million were deferred and amortized to interest expense over the term of the 2018 Notes. The transaction costs allocated to the equity component of $1.1 million were recorded to additional paid-in capital. 2021 Senior Convertible Notes In December 2017, the Company issued $300.0 million principal amount of 5.75% senior convertible notes (the “2021 Notes”) for a purchase price equal to 98% of the principal amount, raising net proceeds of $294.0 million . The 2021 Notes are governed by an Indenture, dated December 8, 2017 between the Company and U.S. Bank National Association, as trustee (the “2017 Indenture”). The 2021 Notes mature on July 1, 2021, unless earlier repurchased or converted, and bear interest at a rate of 5.75% per year payable semi-annually in arrears on January 1 and July 1 of each year, commencing January 1, 2018. The 2021 Notes are convertible at an initial conversion rate of 23.8095 shares of the Company’s common stock per $1,000 principal amount of the 2021 Notes, which represents an initial conversion price of $42.00 per share, subject to adjustment for anti-dilutive issuances, voluntary increases in the conversion rate and make-whole adjustments upon a fundamental change. A fundamental change includes a change in control, delisting of the Company’s common stock and a liquidation of the Company. Upon conversion, the Company will deliver the applicable number of the Company’s common stock and cash in lieu of any fractional shares. Holders of the 2021 Notes may convert their 2021 Notes at any time prior to the close of business on the scheduled trading day immediately preceding the maturity date, subject to a restricted period through December 2018. The holders of the 2021 Notes may require the Company to repurchase all or a portion of their 2021 Notes at a cash repurchase price equal to 100% of the principal amount of the Notes being repurchased, plus the remaining scheduled interest through and including the maturity date, upon a fundamental change and events of default, including non-payment of interest or principal and other obligations under the 2017 Indenture. The 2021 Notes were issued at a two percent discount and accounted for as debt upon issuance. The Company recorded $300.0 million of debt and $6.0 million for the debt discount. The debt discount is accreted to interest expense over the term of the 2021 Notes using the interest method. The Company incurred debt issuance costs of $9.2 million that were deferred and will be amortized to interest expense over the term of the 2021 Notes. The Company agreed to register the resale of the 2021 Notes and the shares of common stock issuable upon conversion of the 2021 Notes. A registration statement on Form S-3 relating to such securities was filed with the U.S. Securities and Exchange Commission by the Company on August 7, 2018. 2018 Notes and 2021 Notes The net carrying amounts of the liability components of the 2018 Notes and 2021 Notes as of September 30, 2018 and December 31, 2017 consists of the following (in thousands): September 30, 2018 December 31, 2017 Principal amount $ 300,000 $ 553,000 Unamortized debt discount (4,746 ) (10,190 ) Net carrying amount before unamortized debt issuance costs 295,254 542,810 Unamortized debt issuance costs (7,298 ) (9,617 ) Net carrying value $ 287,956 $ 533,193 The effective interest rate of the liability component is 6.4% for the 2021 Notes. The following table presents the interest expense recognized related to the 2018 Notes and the 2021 Notes for the three and nine months ended months ended September 30, 2018 and 2017 (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2018 2017 2018 2017 Contractual interest expense at 1.5% and 5.75% per annum $ 4,313 $ 949 $ 14,835 $ 2,847 Amortization of debt issuance costs 604 334 2,474 990 Accretion of debt discount 392 2,078 5,444 6,159 Total $ 5,309 $ 3,361 $ 22,753 $ 9,996 Net proceeds were approximately $245.7 million and $284.9 million from the 2018 Notes and the 2021 Notes, respectively. The Company used approximately $49.5 million of the net proceeds from the 2018 Notes offering to pay the cost of the Note Hedges described below, which was partially offset by $23.2 million of the proceeds from the Company’s sale of the Warrants also described below. Note Hedges Concurrent with the 2018 Notes that were issued in 2013, the Company entered into note hedges (the “Note Hedges”) with certain bank counterparties, with respect to its common stock. The Company paid $49.5 million for the Note Hedges. The Note Hedges cover approximately 4.7 million shares of the Company’s common stock at a strike price of $54.04 per share and were exercisable by the Company upon conversion of the 2018 Notes. The Note Hedges were intended to reduce the potential economic dilution upon conversion of the 2018 Notes in the event that the fair value per share of the Company’s common stock at the time of exercise was greater than the conversion price of the 2018 Notes. On July 1, 2018, the Note Hedges expired upon the maturity of the 2018 Notes. Warrants Separately and concurrently with the entry by the Company into the Note Hedges in 2013, the Company entered into warrant transactions, whereby it sold warrants to the same bank counterparties as the Note Hedges to acquire up to 4.7 million shares of the Company’s common stock at a strike price of $80.06 per share (the “Warrants”), subject to anti-dilution adjustments. The Company received proceeds of $23.2 million from the sale of the Warrants. The Warrants expire at various dates during 2018 and 2019. If the fair value per share of the Company’s common stock exceeds the strike price of the Warrants, the Warrants will reduce diluted earnings per share to the extent that the calculation does not have an anti-dilutive effect. The amounts paid and received for the Note Hedges and the Warrants have been recorded in additional paid-in capital. The fair value of the Note Hedges was not and the Warrants are not remeasured through earnings each reporting period.

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Stockholders' Equity	STOCKHOLDERS ’ EQUITY Share Repurchase Program In November 2017, the Company’s board of directors authorized a $100.0 million share repurchase program of its common stock. The Company may repurchase its common stock for cash in the open market in accordance with applicable securities laws. The timing and amount of any stock repurchase will depend on share price, corporate and regulatory requirements, economic and market conditions, and other factors. The stock repurchase authorization will expire in November 2019 and shares repurchased will be immediately retired. The following is a summary of the Company's stock repurchases under its $100.0 million share repurchase program as of November 2, 2018 (in thousands, except per share information): Period # of Shares Repurchased Average Price per Share Total Expenditures Amount Remaining Under Program November 8, 2017 - December 31, 2017 635 $ 35.55 $ 22,599 January 1, 2018 - March 31, 2018 423 $ 37.84 16,024 April 1, 2018 - June 30, 2018 444 $ 46.66 20,718 July 1, 2018 - September 30, 2018 300 $ 53.82 16,143 Subtotal 1,802 $ 41.86 $ 75,484 $ 24,516 October 1, 2018 - November 2, 2018 307 $ 51.62 15,867 Total 2,109 $ 43.28 $ 91,351 $ 8,649

Stock-Based Awards

Stock-Based Awards	9 Months Ended
	Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Awards	STOCK-BASED AWARDS Stock Options The following table summarizes the Company’s stock option activity for the nine months ended September 30, 2018 (in thousands, except per share and term information): Shares Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term Aggregate Intrinsic Value (1) Outstanding, December 31, 2017 5,432 $ 32.73 5.3 $ 42,282 Granted — — Exercised (1,173 ) 33.04 Forfeited (121 ) 43.94 Outstanding, September 30, 2018 4,138 $ 32.31 4.3 $ 101,132 Shares Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term Aggregate Intrinsic Value (1) Exercisable at September 30, 2018 4,065 $ 32.26 4.3 $ 99,546 Vested and expected to vest at September 30, 2018 4,134 32.31 4.3 101,066 (1) Based on the Company’s closing stock price of $56.75 on September 30, 2018 and $35.33 on December 31, 2017. Unrecognized compensation expense relating to stock options was $0.9 million at September 30, 2018 , which is expected to be recognized over a weighted-average period of 0.9 years . Restricted Stock Units The Company granted restricted stock units covering 1.7 million shares of its common stock during the nine months ended September 30, 2018 . At September 30, 2018 , there were 3.9 million shares of the Company’s common stock issuable upon the vesting of outstanding restricted stock units. Unrecognized compensation expense related to unissued shares of the Company’s common stock subject to unvested restricted stock units was $122.8 million at September 30, 2018 , which is expected to be recognized as expense over the weighted-average period of 2.9 years . Performance-Based Restricted Stock Units The Compensation Committee designed an annual equity compensation structure to further align the compensation levels of certain executives to the performance of the Company through the issuance of performance-based restricted stock units. The number of shares of the Company’s common stock issuable upon the vesting of these performance-based restricted stock unit awards is based upon the Company meeting composite revenue and cash flow growth targets determined at the time of their grants. The total amount of compensation expense recognized is based on the number of shares that the Company determines are probable of vesting. The estimate will be made each reporting period and determined by the Company’s actual and projected revenue and cash flow performance and the compensation expense will be recognized over the vesting term of the awards. The following table summarizes the Company’s issuances of awards under the new compensation award structure: Grant Date Performance Measures Vesting Term Performance Period # of Shares at Target # of Shares at Maximum Grant Date Fair Value per share July 2016 (a) the Company meeting certain revenue and cash flow targets through December 31, 2018 and (b) the recipient continuing to provide services to the Company through the end of June 2019 Three years Fiscal years 2016, 2017 and 2018 166,600 499,800 $ 38.67 March 2017 (a) the Company meeting certain revenue and cash flow targets through December 31, 2019 and (b) the recipient continuing to provide services to the Company through the end of March 2020 Three years Fiscal years 2017, 2018 and 2019 185,270 555,810 $ 41.73 February 2018 (a) the Company meeting certain combined subscription revenue and unlevered cash flow margin targets for the year ending December 31, 2020 and (b) the recipient continuing to provide services to the Company through the end of February 2021 Three years Fiscal year 2020 121,764 304,410 $ 40.64 February 2018 (a) the Company meeting certain combined subscription revenue and unlevered cash flow margin targets for each of the years ending December 31, 2020, December 31, 2021, and December 31, 2022 and (b) the recipient continuing to provide services to the Company through each respective vest date at the end of February 2020, 2021 and 2022 Five years (1) Fiscal years 2020, 2021 and 2022 411,412 1,028,530 $ 40.64 April 2018 (a) the Company meeting certain combined subscription revenue and unlevered cash flow margin targets for the year ending December 31, 2020 and (b) the recipient continuing to provide services to the Company through the beginning of April 2021 Three years Fiscal year 2020 3,572 8,930 $ 39.54 April 2018 (a) the Company meeting certain combined subscription revenue and unlevered cash flow margin targets for each of the years ending December 31, 2020, December 31, 2021, and December 31, 2022 and (b) the recipient continuing to provide services to the Company through each respective vest date at the beginning of April 2020, 2021 and 2022 Five years (1) Fiscal years 2020, 2021 and 2022 53,572 133,930 $ 39.54 (1) One-third of the total eligible shares shall vest on each of the third, fourth and fifth anniversaries of the grant date. This award is a one-time equity award intended to cover expected grant levels over a three-year period. In exchange, the Compensation Committee does not plan to grant any additional equity awards to recipients of this award until 2021. The Company recognized compensation expense related to all performance-based awards in the aggregate amount of $1.7 million and $3.9 million for the three and nine months ended September 30, 2018 , respectively. There was no unrecognized compensation expense related to unvested 2016 and 2017 performance-based restricted stock unit awards at September 30, 2018 . Unrecognized compensation expense related to unvested 2018 performance-based restricted stock units was $20.1 million at September 30, 2018 , based on the probable performance target at that date, which is expected to be recognized as expense over the weighted average period of 3.6 years . Employee Stock Purchase Plan Under the Company’s 2010 Employee Stock Purchase Plan (“ESPP”), eligible employees are granted the right to purchase shares at the lower of 85% of the fair market value of the stock at the time of grant or 85% of the fair market value at the time of exercise. The right to purchase shares is granted twice yearly for six month offering periods in June and December and exercisable on or about the succeeding December and June, respectively, on each year. Stock-Based Compensation Stock-based compensation expense related to stock options, restricted stock units, the ESPP and performance-based restricted stock units is included in the following line items in the accompanying Condensed Consolidated Statements of Operations for the three and nine months ended months ended September 30, 2018 and 2017 (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2018 2017 2018 2017 Cost of revenue $ 1,082 $ 1,216 $ 3,105 $ 3,629 Sales and marketing 5,927 7,988 18,718 21,534 Research and development 3,212 2,641 7,937 7,140 General and administrative 5,268 5,737 15,055 18,726 Restructuring 42 — 6,227 — Total $ 15,531 $ 17,582 $ 51,042 $ 51,029

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (the “Tax Act”) was signed into law making significant changes to the Internal Revenue Code of 1986, as amended. The Tax Act did not result in any material tax expense during nine months ended September 30, 2018 . The Company’s income tax provision was approximately $0.5 million and $1.6 million with an effective income tax rate of (27.1)% and (5.5)% for the three and nine months ended September 30, 2018 , respectively. The Company’s income tax provision was approximately $0.5 million and $1.4 million with an effective income tax rate of (3.5)% and (2.8)% for the three months nine months ended September 30, 2017 , respectively. The Company’s effective tax rate differs from the statutory rate primarily due to the change in the valuation allowance on the Company’s deferred tax assets and foreign income taxes. The income tax provision is related to domestic income, certain foreign income and withholding taxes. The Company does not have a material tax provision in the significant jurisdictions it operates in, such as the United States and United Kingdom, as it has historically generated losses. The Company has recorded a full valuation allowance against the net deferred tax assets and the Company does not currently anticipate recording an income tax benefit related to these deferred tax assets or current year losses. The Company will reassess the realization of deferred tax assets each reporting period and will be able to reduce the valuation allowance to the extent that the financial results of these operations improve and it becomes more likely than not that the deferred tax assets are realizable. The Company is subject to United States federal income tax as well as to income tax in multiple state and foreign jurisdictions, including the United Kingdom. Federal income tax returns of the Company are subject to IRS examination for the 2015 through 2017 tax years. State income tax returns are subject to examination for the 2014 through 2017 tax years. Foreign income tax returns are subject to examination for the 2007 through 2017 tax years. The Company believes it is reasonably possible that within the next twelve months it may resolve certain matters related to the years under examination, which may result in reductions of its unrecognized tax benefits and income tax expense of up to $1.1 million . At September 30, 2018 , the Company was not able to reasonably estimate, and therefore have not recorded, deferred taxes for the Global Intangible Low-Taxed Income (“GILTI”) provisions. The Company has not yet determined its policy election with respect to whether to record deferred taxes for basis differences expected to reverse as a result of the GILTI provisions in future periods or use the period cost method. The Company has, however, included an estimate of the current GILTI impact in its tax provision for 2018.

Restructuring Costs

Restructuring Costs	9 Months Ended
	Sep. 30, 2018
Restructuring and Related Activities [Abstract]
Restructuring Costs	RESTRUCTURING COSTS In December 2017, as part of the Company’s new strategic plan to focus on recurring revenue growth and increase operating margins, the Company approved a restructuring plan to reduce the headcount of the Company’s global service delivery team, as well as the headcount of some of its sales teams, representing a total workforce reduction of approximately six percent. The restructuring is part of the Company’s renewed focus on recurring, or subscription-based, revenue growth and driving cost reductions to accelerate the growth of its operating margins and free cash flow. During the three and nine months ended September 30, 2018 , the Company continued with strategic plan with the reduction of the professional service and sales headcount, resulting in $0.2 million and $8.9 million of restructuring expense, respectively, which was recorded in “Restructuring” in the accompanying Consolidated Statements of Operations. For the three months ended September 30, 2018 , the restructuring expense of $0.2 million consisted primarily of payroll-related costs, such as severance, outplacement costs and continuing healthcare coverage, associated with employee terminations. For the nine months ended September 30, 2018 , the restructuring expense consisted primarily of stock-based compensation expense of $6.2 million , and $2.7 million of payroll-related costs. The stock-based compensation expense relates to accelerated vesting for impacted employees. As of September 30, 2018 , the Company incurred an aggregate total of $10.5 million of restructuring expense since December 2017, which consisted primarily of $6.2 million of stock-based compensation expense and $4.3 million of payroll related costs.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	COMMITMENTS AND CONTINGENCIES Guarantees and Indemnifications The Company has made guarantees and indemnities under which it may be required to make payments to a guaranteed or indemnified party, in relation to certain transactions, including revenue transactions in the ordinary course of business. The Company is obligated to indemnify its directors and officers to the maximum extent permitted under the laws of the State of Delaware. However, the Company has a directors and officers insurance policy that may reduce its exposure in certain circumstances and may enable it to recover a portion of future amounts that may be payable, if any. The duration of the guarantees and indemnities varies and, in many cases, is indefinite but subject to statutes of limitations. To date, the Company has made no payments related to these guarantees and indemnities. The Company estimates the fair value of its indemnification obligations as insignificant based on this history and the Company’s insurance coverage and therefore has not recorded any liability for these guarantees and indemnities in the accompanying condensed consolidated balance sheets. Lease Commitments During the nine months ended September 30, 2018 , the Company entered into an operating lease agreement with remaining obligations of approximately $0.5 million in 2018, $6.9 million in 2019 , $7.2 million in 2020 , $7.5 million in 2021 , $7.8 million in 2022 and $8.5 million thereafter. Litigation The Company is subject to various legal proceedings and claims that arise in the ordinary course of business. If the Company determines that it is probable that a loss has been incurred and the amount is reasonably estimable, the Company will record a liability. The Company has determined that it does not have a potential liability related to any legal proceedings or claims that would individually or in the aggregate materially adversely affect its financial condition or operating results.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	RELATED PARTY TRANSACTIONS The Cornerstone OnDemand Foundation (the “Foundation”) empowers communities in the United States and internationally by increasing the impact of the non-profit sector through the utilization of human capital management technology including the Company’s products. The Company’s chief executive officer is on the board of directors of the Foundation. The Company does not direct the Foundation’s activities, and accordingly, the Company does not consolidate the Foundation’s statement of activities with its financial results. During the three months ended September 30, 2018 and 2017 , the Company provided at no charge certain resources to the Foundation, with approximate values of $0.9 million and $0.9 million , respectively. During the nine months ended September 30, 2018 and 2017 , the Company provided at no charge certain resources to the Foundation, with approximate values of $2.8 million and $2.6 million , respectively.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS During October and November 2018, the Compensation Committee granted restricted stock units covering an aggregate of 420,757 shares of the Company’s common stock which generally vest annually over four years. In November 2018, the Company entered into a definitive agreement to acquire Grovo Learning, Inc., a leading provider of microlearning content, for approximately $24.0 million in an all-cash transaction. The determination of the final purchase price is subject to certain working capital and other post-closing adjustments. Certain disclosures required for business combinations, including the allocation of purchase price, have been omitted because the initial accounting for the business combination was incomplete as of the filing date of this report. This information will be included in our subsequent Form 10-K.

Organization And Summary Of S_2

Organization And Summary Of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements are presented in accordance with (i) accounting standards generally accepted in the United States of America (“GAAP”) for interim financial information and (ii) the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, such financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, the financial statements include all adjustments (consisting of normal recurring adjustments) necessary for the fair presentation of the interim periods presented. Results for the three and nine months ended September 30, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018 , for any other interim period or for any other future year. The condensed consolidated balance sheet at December 31, 2017 has been derived from the audited financial statements at that date, but does not include all of the disclosures required by GAAP. The Company’s significant accounting policies are described in “Note 2. Summary of Significant Accounting Policies” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 . The Company follows the same accounting policies for interim reporting. The financial information included in this Quarterly Report on Form 10-Q should be read in conjunction with the Company’s consolidated financial statements and related notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 . Effective January 1, 2018, the Company adopted the requirements of Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers , as discussed further in Note 1. All amounts and disclosures set forth in this Quarterly Report on Form 10-Q have been updated to comply with this new standard with results for reporting periods beginning after January 1, 2018 presented under ASU No. 2014-09, while prior period amounts are not adjusted and continue to be reported under the accounting standards in effect for the prior period.
Recent Accounting Pronouncements	Recently Adopted Accounting Pronouncements In June 2018, the Financial Accounting Standards Board (“FASB”) issued a new ASU, which aligns the accounting for share-based compensation for non-employees with employees. The guidance is effective for interim and annual reporting periods beginning after December 15, 2018. The Company early adopted this ASU in the second quarter of 2018, and the adoption did not have a material impact on its financial statements. In May 2017, the FASB issued a new ASU, which amends the scope of modification accounting for share-based payment arrangements. It provides guidance on the types of changes to the terms or conditions of share-based payment awards to which an entity would be required to apply modification accounting under Accounting Standards Codification (“ASC”) 718, Compensation - Stock compensation . The Company implemented this requirement as of the beginning of the first quarter of 2018. The adoption did not have a material impact on its financial statements. In January 2017, the FASB issued a new ASU, which clarifies the definition of a business, which affects many areas of accounting including acquisitions, disposals, goodwill and consolidation. The Company implemented this requirement as of the beginning of the first quarter of 2018. The adoption did not have a material impact on its financial statements. In August 2016, the FASB issued a new ASU to clarify how companies present and classify certain cash receipts and cash payments in the statement of cash flows. The Company implemented this requirement as of the beginning of the first quarter of 2018. The adoption did not have a material impact on its financial statements. In January 2016, the FASB issued a new ASU that provides guidance for the recognition, measurement, presentation and disclosure of financial assets and liabilities. The Company implemented this requirement as of the beginning of the first quarter of 2018. The adoption did not have a material impact on its financial statements. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (“Topic 606”) . Topic 606 supersedes the revenue recognition requirement in ASC Topic 605 , Revenue Recognition (“Topic 605”) , and requires the recognition of revenue to depict the transfer of promised goods or services to customers in an amount that reflects the expected consideration entitled in exchange for those goods or services. Topic 606 also includes Subtopic 340-40, Other Assets and Deferred Costs - Contracts with Customers , which requires the deferral of incremental costs of obtaining a contract with a customer. The Company adopted the requirements of Topic 606 utilizing the modified retrospective method of transition to contracts as of January 1, 2018. The accumulated deficit balance was reduced, thus stockholders' equity was increased by $18.9 million as of January 1, 2018 due to the cumulative impact of adopting Topic 606. The impact was primarily related to: • $15.5 million increase in deferred commissions. Such costs are considered to be costs to acquire a contract under Topic 606, and primarily relate to the execution of software subscription contracts. In addition, upon adoption, these incremental commission costs to obtain a contract are now amortized over a period of benefit, which is generally six years. • $2.7 million of additional liability offsets the impact to retained earnings from the increase of the deferred commission above. The liability is to accrue commission costs earned but not yet paid. • $6.1 million reduction in deferred revenue related to additional contract value being allocated to professional services delivered prior to adoption. Previously such amounts were not recognized based on contractual payment limitations. Upon adoption, revenue for professional services is based on the relative standalone selling price without any such limitation. The adoption had no impact to net cash provided by or used in operating, investing or financing activities in the Company’s Condensed Consolidated Statements of Cash Flows. Recent Accounting Pronouncements In February 2016, the FASB issued a new ASU, that was updated in 2018, amends a number of aspects of lease accounting, including requiring lessees to recognize operating leases with a term greater than one year on their balance sheet as a right-of-use asset and corresponding lease liability, measured at the present value of the lease payments. This guidance is effective for the Company’s interim and annual reporting periods beginning January 1, 2019. Upon adoption, the Company expects to recognize additional assets and related lease liabilities on the consolidated balance sheets. The Company is currently evaluating the impact of the adoption of this ASU on its financial statements. In June 2016, the FASB issued a new ASU, which requires the measurement and recognition of expected credit losses for financial assets held at amortized cost. This guidance replaces the existing incurred loss impairment model with an expected loss methodology, which will result in more timely recognition of credit losses. This ASU is effective for annual reporting periods, and interim periods within those years, beginning after December 15, 2019, and requires a cumulative effect adjustment to the balance sheet as of the beginning of the first reporting period in which the guidance is effective. The Company is currently in the process of evaluating the impact of the adoption of this ASU on its consolidated financial statements. In January 2017, The FASB issued a new ASU which simplifies the accounting for goodwill impairments by eliminating step 2 from the goodwill impairment test. Instead, if the carrying amount of a reporting unit exceeds its fair value, an impairment loss shall be recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit. This ASU will be applied prospectively and is effective for annual reporting periods, and interim periods within those years, beginning after December 15, 2019. The Company is currently currently in the process of evaluating the impact of the adoption of ASU on its consolidated financial statements. In March 2018, the FASB issued a new ASU, which aligns the accounting for implementation costs incurred in a hosting arrangement that is a service contract with the accounting for implementation costs incurred to develop or obtain internal-use software under ASC 350-40, in order to determine which costs to capitalize and recognize as an asset. This guidance is effective for annual reporting periods, and interim periods within those years, beginning after December 15, 2019, and can be applied either prospectively to implementation costs incurred after the date of adoption or retrospectively to all arrangements. The Company is currently in the process of evaluating the impact of the adoption of this ASU on its consolidated financial statements. In August 2018, the SEC issued a final rule that amends certain of its disclosure requirements. The changes are generally intended to reduce or eliminate certain disclosures that have become redundant, duplicative, overlapping, outdated or superseded in light of other disclosure requirements or changes in the information environment. The rule also requires SEC registrants to present changes in stockholders' equity and the amount of dividends per share for each class of shares on a quarterly basis for the current and prior-year periods. The final rule is effective for SEC filings made on or after November 2, 2018. In August 2018, the FASB issued a new ASU that provides additional guidance on the accounting for costs of implementation activities performed in a cloud computing arrangement that is a service contract. The amendments in this update also provide additional disclosure requirements to disclose the nature of an entity's hosting arrangements that are service contracts. This ASU is effective for annual and interim periods beginning after December 15, 2019. The Company is evaluating the impact of the adoption of this ASU on its consolidated financial statements. Summary of Significant Accounting Policies Except for changes to the Company's revenue recognition policy and the accounting for commission payments, there have been no changes to the Company’s significant accounting policies described in the Annual Report on Form 10-K for the year ended December 31, 2017, filed with the SEC on February 27, 2018. See below for additional accounting policy and transition disclosures. Revenue Recognition Effective January 1, 2018, the Company adopted the guidance under Topic 606. The Company derives its revenue from the following sources: Subscriptions to the Company’s products and other offerings on a recurring basis Clients pay subscription fees for access to the Company’s enterprise human capital management platform, other products and support on a recurring basis. Fees are based on a number of factors, including the number of products purchased, which may include e-learning content, and the number of users having access to a product. The Company generally recognizes revenue from subscriptions ratably over the term of the agreements beginning on the date the subscription service is made available to the client. Subscription agreements are typically three years, billed annually in advance, and non-cancelable, with payment due within 30 days of the invoice date. Professional services and other The Company offers its clients and implementation partners assistance in implementing its products and optimizing their use. Professional services include application configuration, system integration, business process re-engineering, change management and training services. Services are generally billed up-front on a fixed fee basis and to a lesser degree on a time-and-material basis. These services are generally purchased as part of a subscription arrangement and are typically performed within the first several months of the arrangement. Clients may also purchase professional services at any other time. The Company generally recognizes revenue from fixed fee professional services contracts as services are performed based on the proportion performed to date relative to the total expected services to be performed. Revenue associated with time-and-material contracts are recorded as such time-and-materials are incurred. The Company recognizes revenue from contracts with customers based on the following five steps: 1) Identification of the contract, or contracts, with a customer 2) Identification of all performance obligations in the contract 3) Determination of the transaction price 4) Allocation of the transaction price to the performance obligations in the contract 5) Recognition of revenue as we satisfy a performance obligation The Company identifies enforceable contracts with a customer when the agreement is signed. The Company accounts for individual performance obligations separately if they are distinct. The transaction price is generally based on fixed fees stated in the contract. The Company excludes from the transaction price any amounts relating to taxes from product sales which are collected from customers and remitted to governmental authorities. If the contract contains a single performance obligation, the entire transaction price is allocated to the single performance obligation. Contracts that contain multiple performance obligations require an allocation of the transaction price to each performance obligation based on a relative standalone selling price basis. The Company is not able to directly observe a standalone selling price for its performance obligations, as the performance obligations are sold separately and within a sufficiently narrow price range only infrequently, and because management has determined that there are no third-party offerings reasonably comparable to the Company’s products. Accordingly, total contract values are allocated to subscriptions to the products and professional services based on the standalone selling price (“SSP”). The determination of SSP requires the Company to make significant estimates and judgments. The Company considers numerous factors, including the nature and complexity of the performance obligations themselves; the geography, market conditions and competitive landscape for the sale; internal costs; and pricing and discounting practices. The Company updates its estimates of SSP on an ongoing basis through internal periodic reviews and as events or circumstances may require. Revenue is recognized at the time the related performance obligation is satisfied by transferring a promised service to a customer. The Company satisfies performance obligations over time. In a limited number of cases, the client’s intended use of a product requires contractually specified enhancements to its underlying features and functionality. In some of these cases, revenue is recognized as a combined single performance obligation on a straight-line basis from the point at which access to the enhanced product(s) have been provided, through the remaining term of the agreement. In other cases where the enhancement is not contractually specified by the customer for its initial use and revenue is recognized separately for the enhancement and the product as a second distinct performance obligation. In such cases where a second performance obligation exists, the enhancement revenue is recognized based on a SSP allocation on a straight-line basis once access to the enhancement has been provided, through the remaining term of the agreement. For arrangements in which the Company resells third-party e-learning training content to clients, revenue is recognized in accordance with accounting guidance as to when to report gross revenue as a principal or report net revenue as an agent. The Company typically recognizes third-party content revenue at the gross amount invoiced to clients as (i) the Company is primarily responsible for hosting the content on our platform for the term of the agreement, (ii) the Company controls the content before access is provided to the customer, and (iii) the Company typically has discretion to establish the price charged. Deferred Revenue The Company records amounts that have been invoiced to its clients in accounts receivable and in either deferred revenue or revenue depending on whether the revenue recognition criteria described above have been met. Deferred revenue that will be recognized during the succeeding twelve-month period from the respective balance sheet date is recorded as current deferred revenue and the remaining portion is recorded as noncurrent. The decrease in the deferred revenue balance for the nine months ended September 30, 2018 is primarily driven by $271.7 million of revenue recognized that were included in the deferred revenue balances as of January 1, 2018 offset by invoices billed in advance of satisfying performance obligations in accordance with contract payment terms. Transaction Price Allocated to Remaining Performance Obligations As of September 30, 2018 , approximately $837.0 million of revenue is expected to be recognized from remaining performance obligations. This amount mainly comprises subscription revenue, with less than 10% attributable to professional services and other revenue. The Company expects to recognize revenue on approximately two thirds of these remaining performance obligations over the next 18 months , with the balance recognized thereafter. The estimated revenues from the remaining performance obligations do not include uncommitted contract amounts such as (i) amounts which are cancelable by the client without any significant penalty, (ii) future billings for time and material contracts, and (iii) amounts associated with optional renewal periods. Commission Payments The Company defers commissions paid to its sales force and related payroll taxes as these amounts are incremental costs of obtaining a contract with a customer and are recoverable from future revenue due to the non-cancelable client agreements that gave rise to the commissions. Commissions for initial contracts are deferred on the balance sheet and amortized on a straight-line basis over a period of benefit that has been determined to be six years. The Company took into consideration technology and other factors in estimating the benefit period. Sales commissions for renewal contracts are deferred and amortized on a straight-line basis over the related contract renewal period. Amortization expense is included in sales and marketing expenses in the accompanying condensed consolidated statements of operations. For the three and nine months ended September 30, 2018 , the amount of amortization expense was $8.0 million and $25.8 million , respectively, and there was no impairment loss in relation to the costs capitalized. Impact of New Standard on Financial Statement Line Items The following tables summarize the effect of the adoption of Topic 606 on the Company’s select line items, included in the unaudited consolidated condensed financial statements as of and for the quarter ended September 30, 2018 , as if the previous accounting was in effect (in thousands). September 30, 2018 Condensed Consolidated Balance Sheet As Reported Impacts of Adoption Without Adoption Assets Deferred commissions, current portion $ 24,880 $ 19,317 $ 44,197 Deferred commissions, non-current 37,313 (37,313 ) — Liabilities Accrued expenses 61,346 (2,333 ) 59,013 Deferred revenue, current portion 266,209 6,374 272,583 Stockholders’ Equity Accumulated deficit (526,789 ) (22,037 ) (548,826 ) Three Months Ended Nine Months Ended September 30, 2018 September 30, 2018 Condensed Consolidated Statement of Operations As Reported Impacts of Adoption Without Adoption As Reported Impacts of Adoption Without Adoption Revenue $ 134,014 $ (349 ) $ 133,665 $ 399,644 $ (314 ) $ 399,330 Operating expenses: Sales and marketing 53,215 (1,050 ) 52,165 172,281 (950 ) 171,331 Net loss (2,447 ) 701 (1,746 ) (30,670 ) 636 (30,034 ) Net loss per share, basic and diluted (0.04 ) (0.03 ) (0.53 ) (0.52 ) Weighted average common shares outstanding, basic and diluted 58,699 58,699 57,994 57,994 The adoption of Topic 606 had no impact to net cash provided by or used in operating, investing or financing activities in the Company’s unaudited condensed statement of cash flows for the nine months ended September 30, 2018 .

Organization And Summary Of S_3

Organization And Summary Of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Effects of the Adoption of Topic 606	The following tables summarize the effect of the adoption of Topic 606 on the Company’s select line items, included in the unaudited consolidated condensed financial statements as of and for the quarter ended September 30, 2018 , as if the previous accounting was in effect (in thousands). September 30, 2018 Condensed Consolidated Balance Sheet As Reported Impacts of Adoption Without Adoption Assets Deferred commissions, current portion $ 24,880 $ 19,317 $ 44,197 Deferred commissions, non-current 37,313 (37,313 ) — Liabilities Accrued expenses 61,346 (2,333 ) 59,013 Deferred revenue, current portion 266,209 6,374 272,583 Stockholders’ Equity Accumulated deficit (526,789 ) (22,037 ) (548,826 ) Three Months Ended Nine Months Ended September 30, 2018 September 30, 2018 Condensed Consolidated Statement of Operations As Reported Impacts of Adoption Without Adoption As Reported Impacts of Adoption Without Adoption Revenue $ 134,014 $ (349 ) $ 133,665 $ 399,644 $ (314 ) $ 399,330 Operating expenses: Sales and marketing 53,215 (1,050 ) 52,165 172,281 (950 ) 171,331 Net loss (2,447 ) 701 (1,746 ) (30,670 ) 636 (30,034 ) Net loss per share, basic and diluted (0.04 ) (0.03 ) (0.53 ) (0.52 ) Weighted average common shares outstanding, basic and diluted 58,699 58,699 57,994 57,994

Business Acquisition (Tables)

Business Acquisition (Tables)	9 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
Schedule of Allocation of Purchase Price	The Company’s allocation of the total purchase price consideration as of September 10, 2018 is summarized below (in thousands): Fair Value Cash and cash equivalents $ 115 Other assets 68 Intangible assets - developed technology 7,500 Goodwill 10,525 Total purchase price $ 18,208

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Summary of Basic and Diluted Loss Per Share	The following table presents the Company’s basic and diluted net loss per share (in thousands, except per share amounts): Three Months Ended Nine Months Ended September 30, September 30, 2018 2017 2018 2017 Net loss $ (2,447 ) $ (14,855 ) $ (30,670 ) $ (52,331 ) Weighted-average shares of common stock outstanding 58,699 57,627 57,994 57,072 Net loss per share – basic and diluted $ (0.04 ) $ (0.26 ) $ (0.53 ) $ (0.92 )
Anti-Dilutive Shares Excluded from Calculation of Diluted Net Loss Per Share	At September 30, 2018 and 2017 , the following potential shares were excluded from the computation of diluted net loss per share because their effect would have been anti-dilutive (in thousands): September 30, 2018 2017 Options to purchase common stock, restricted stock units and performance-based restricted stock units 10,575 11,112 Shares issuable pursuant to employee stock purchase plan 89 98 Convertible notes 7,143 4,682 Common stock warrants 4,682 4,682 Total shares excluded from net loss per share 22,489 20,574

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Summary of Marketable Securities	The following is a summary of investments in marketable securities, including those that meet the definition of a cash equivalent, as of September 30, 2018 (in thousands): September 30, 2018 Amortized Cost Basis Unrealized Gains Unrealized Losses Fair Value Cash Equivalent Investments Money market funds $ 93,789 $ — $ — $ 93,789 $ 93,789 $ — Certificate of deposit 10,000 — — 10,000 10,000 — Corporate bonds 67,614 5 (121 ) 67,498 — 67,498 U.S. treasury securities 187,217 — (276 ) 186,941 — 186,941 $ 358,620 $ 5 $ (397 ) $ 358,228 $ 103,789 $ 254,439 The following is a summary of investments in marketable securities, including those that meet the definition of a cash equivalent, as of December 31, 2017 (in thousands): December 31, 2017 Amortized Cost Basis Unrealized Gains Unrealized Losses Fair Value Cash Equivalent Investments Money market funds $ 358,859 $ — $ — $ 358,859 $ 358,859 $ — Certificate of deposit 10,000 — — 10,000 10,000 — Corporate bonds 74,868 — (220 ) 74,648 — 74,648 U.S. treasury securities 189,310 — (430 ) 188,880 — 188,880 $ 633,037 $ — $ (650 ) $ 632,387 $ 368,859 $ 263,528

Intangible Assets And Goodwill

Intangible Assets And Goodwill (Tables)	9 Months Ended
	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Gross Carrying Amount and Accumulated Amortization of Finite-lived Intangible Assets	The following table presents the gross carrying amount and accumulated amortization of finite-lived intangible assets as of September 30, 2018 and December 31, 2017 (in thousands): September 30, 2018 December 31, 2017 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Developed technology $ 7,500 $ (208 ) $ 7,292 $ 29,984 $ (29,984 ) $ — Software license rights — — — 1,654 (1,654 ) — $ 7,500 $ (208 ) $ 7,292 $ 31,638 $ (31,638 ) $ —
Schedule of Estimated Remaining Intangible Asset Amortization	The following table presents the Company’s estimate of remaining amortization expense, which will be recorded in cost of revenue, for each of the succeeding fiscal years ending December 31 for finite-lived intangible assets that existed at September 30, 2018 (in thousands): Remainder of 2018 $ 625 2019 2,500 2020 2,500 2021 1,667 Total future amortization $ 7,292
Schedule of Goodwill	The following table presents the changes in the carrying amount of goodwill for the nine months ended September 30, 2018 and the year ended December 31, 2017 (in thousands): Goodwill as of December 31, 2017 $ 25,894 Goodwill from Workpop acquisition 10,376 Goodwill as of September 30, 2018 $ 36,270

Fair Value Of Financial Instr_2

Fair Value Of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Summary of Assets and Liabilities Measured at Fair Value	Assets and liabilities measured at fair value on a recurring basis included the following as of September 30, 2018 and December 31, 2017 (in thousands): September 30, 2018 December 31, 2017 Fair Value Level 1 Level 2 Level 3 Fair Value Level 1 Level 2 Level 3 Cash equivalents $ 103,789 $ 93,789 $ 10,000 $ — $ 368,859 $ 358,859 $ 10,000 $ — Corporate bonds 67,498 — 67,498 — 74,648 — 74,648 — U.S. treasury securities 186,941 — 186,941 — 188,880 — 188,880 — $ 358,228 $ 93,789 $ 264,439 $ — $ 632,387 $ 358,859 $ 273,528 $ —

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Summary of Net Carrying Amount of Debt	The net carrying amounts of the liability components of the 2018 Notes and 2021 Notes as of September 30, 2018 and December 31, 2017 consists of the following (in thousands): September 30, 2018 December 31, 2017 Principal amount $ 300,000 $ 553,000 Unamortized debt discount (4,746 ) (10,190 ) Net carrying amount before unamortized debt issuance costs 295,254 542,810 Unamortized debt issuance costs (7,298 ) (9,617 ) Net carrying value $ 287,956 $ 533,193
Schedule of Interest Expense Recognized	The following table presents the interest expense recognized related to the 2018 Notes and the 2021 Notes for the three and nine months ended months ended September 30, 2018 and 2017 (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2018 2017 2018 2017 Contractual interest expense at 1.5% and 5.75% per annum $ 4,313 $ 949 $ 14,835 $ 2,847 Amortization of debt issuance costs 604 334 2,474 990 Accretion of debt discount 392 2,078 5,444 6,159 Total $ 5,309 $ 3,361 $ 22,753 $ 9,996

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Summary of Stock Repurchase Program	The following is a summary of the Company's stock repurchases under its $100.0 million share repurchase program as of November 2, 2018 (in thousands, except per share information): Period # of Shares Repurchased Average Price per Share Total Expenditures Amount Remaining Under Program November 8, 2017 - December 31, 2017 635 $ 35.55 $ 22,599 January 1, 2018 - March 31, 2018 423 $ 37.84 16,024 April 1, 2018 - June 30, 2018 444 $ 46.66 20,718 July 1, 2018 - September 30, 2018 300 $ 53.82 16,143 Subtotal 1,802 $ 41.86 $ 75,484 $ 24,516 October 1, 2018 - November 2, 2018 307 $ 51.62 15,867 Total 2,109 $ 43.28 $ 91,351 $ 8,649

Stock-Based Awards (Tables)

Stock-Based Awards (Tables)	9 Months Ended
	Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Stock Option Activity	The following table summarizes the Company’s stock option activity for the nine months ended September 30, 2018 (in thousands, except per share and term information): Shares Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term Aggregate Intrinsic Value (1) Outstanding, December 31, 2017 5,432 $ 32.73 5.3 $ 42,282 Granted — — Exercised (1,173 ) 33.04 Forfeited (121 ) 43.94 Outstanding, September 30, 2018 4,138 $ 32.31 4.3 $ 101,132 Shares Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term Aggregate Intrinsic Value (1) Exercisable at September 30, 2018 4,065 $ 32.26 4.3 $ 99,546 Vested and expected to vest at September 30, 2018 4,134 32.31 4.3 101,066 (1) Based on the Company’s closing stock price of $56.75 on September 30, 2018 and $35.33 on December 31, 2017.
Schedule of Issuances of Awards Under New Compensation Award Structure	The following table summarizes the Company’s issuances of awards under the new compensation award structure: Grant Date Performance Measures Vesting Term Performance Period # of Shares at Target # of Shares at Maximum Grant Date Fair Value per share July 2016 (a) the Company meeting certain revenue and cash flow targets through December 31, 2018 and (b) the recipient continuing to provide services to the Company through the end of June 2019 Three years Fiscal years 2016, 2017 and 2018 166,600 499,800 $ 38.67 March 2017 (a) the Company meeting certain revenue and cash flow targets through December 31, 2019 and (b) the recipient continuing to provide services to the Company through the end of March 2020 Three years Fiscal years 2017, 2018 and 2019 185,270 555,810 $ 41.73 February 2018 (a) the Company meeting certain combined subscription revenue and unlevered cash flow margin targets for the year ending December 31, 2020 and (b) the recipient continuing to provide services to the Company through the end of February 2021 Three years Fiscal year 2020 121,764 304,410 $ 40.64 February 2018 (a) the Company meeting certain combined subscription revenue and unlevered cash flow margin targets for each of the years ending December 31, 2020, December 31, 2021, and December 31, 2022 and (b) the recipient continuing to provide services to the Company through each respective vest date at the end of February 2020, 2021 and 2022 Five years (1) Fiscal years 2020, 2021 and 2022 411,412 1,028,530 $ 40.64 April 2018 (a) the Company meeting certain combined subscription revenue and unlevered cash flow margin targets for the year ending December 31, 2020 and (b) the recipient continuing to provide services to the Company through the beginning of April 2021 Three years Fiscal year 2020 3,572 8,930 $ 39.54 April 2018 (a) the Company meeting certain combined subscription revenue and unlevered cash flow margin targets for each of the years ending December 31, 2020, December 31, 2021, and December 31, 2022 and (b) the recipient continuing to provide services to the Company through each respective vest date at the beginning of April 2020, 2021 and 2022 Five years (1) Fiscal years 2020, 2021 and 2022 53,572 133,930 $ 39.54 (1) One-third of the total eligible shares shall vest on each of the third, fourth and fifth anniversaries of the grant date. This award is a one-time equity award intended to cover expected grant levels over a three-year period. In exchange, the Compensation Committee does not plan to grant any additional equity awards to recipients of this award until 2021.
Summary of Stock-based Compensation Expense	Stock-based compensation expense related to stock options, restricted stock units, the ESPP and performance-based restricted stock units is included in the following line items in the accompanying Condensed Consolidated Statements of Operations for the three and nine months ended months ended September 30, 2018 and 2017 (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2018 2017 2018 2017 Cost of revenue $ 1,082 $ 1,216 $ 3,105 $ 3,629 Sales and marketing 5,927 7,988 18,718 21,534 Research and development 3,212 2,641 7,937 7,140 General and administrative 5,268 5,737 15,055 18,726 Restructuring 42 — 6,227 — Total $ 15,531 $ 17,582 $ 51,042 $ 51,029

Organization And Summary Of S_4

Organization And Summary Of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	Jan. 01, 2018USD ($)	Sep. 30, 2018USD ($)		Sep. 30, 2018USD ($)segment		Dec. 31, 2017USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments | segment				1
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Increase in stockholders' equity		$ 54,419	[1]	$ 54,419	[1]	$ 22,120
Decrease in accumulated deficit		(526,789)	[1]	(526,789)	[1]	$ (515,054)
Revenue expected to be recognized		837,000		837,000
Amortization of deferred commissions expense		8,000		$ 25,800
Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues recognized, previously included in beginning balances	$ 271,700
Expected revenue recognition percentage				66.70%
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Increase in stockholders' equity	18,900
Decrease in accumulated deficit	18,900	$ (22,037)		$ (22,037)
Increase in deferred commissions	15,500
Additional liability to accrue commission cost	2,700
Reduction in deferred revenue	$ 6,100
[1]	See Note 1 for summary of adjustments.

Organization And Summary Of S_5

Organization And Summary Of Significant Accounting Policies - Effect of Topic 606 on Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2018		Jan. 01, 2018	Dec. 31, 2017
Assets
Deferred commissions, current portion	$ 24,880	[1]		$ 42,806
Deferred commissions, net of current portion	37,313	[1]		0
Liabilities
Accrued expenses	61,346	[1]		57,528
Deferred revenue, current portion	266,209	[1]		311,997
Stockholders’ Equity
Accumulated deficit	(526,789)	[1]		$ (515,054)
Calculated under Revenue Guidance in Effect before Topic 606
Assets
Deferred commissions, current portion	44,197
Deferred commissions, net of current portion	0
Liabilities
Accrued expenses	59,013
Deferred revenue, current portion	272,583
Stockholders’ Equity
Accumulated deficit	(548,826)
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Assets
Deferred commissions, current portion	19,317
Deferred commissions, net of current portion	(37,313)
Liabilities
Accrued expenses	(2,333)
Deferred revenue, current portion	6,374
Stockholders’ Equity
Accumulated deficit	$ (22,037)		$ 18,900
[1]	See Note 1 for summary of adjustments.

Organization And Summary Of S_6

Organization And Summary Of Significant Accounting Policies - Effect of Topic 606 on Statement of Operations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018		Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	$ 134,014	[1]	$ 121,796	$ 399,644	[1]	$ 350,029
Operating expenses:
Sales and marketing	53,215	[1]	60,554	172,281	[1]	179,521
Net loss	$ (2,447)	[1],[2]	$ (14,855)	$ (30,670)	[1],[2],[3]	$ (52,331)
Net loss per share, basic and diluted (USD per share)	$ (0.04)	[1]	$ (0.26)	$ (0.53)	[1]	$ (0.92)
Weighted average common shares outstanding, basic and diluted (in shares)	58,699	[1]	57,627	57,994	[1]	57,072
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	$ 133,665			$ 399,330
Operating expenses:
Sales and marketing	52,165			171,331
Net loss	$ (1,746)			$ (30,034)
Net loss per share, basic and diluted (USD per share)	$ (0.03)			$ (0.52)
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	$ (349)			$ (314)
Operating expenses:
Sales and marketing	(1,050)			(950)
Net loss	$ 701			$ 636
[1]	See Note 1 for summary of adjustments.
[2]	See Note 1 for summary of adjustments.
[3]	See Note 1 for additional information.

Business Acquisition - Addition

Business Acquisition - Additional Information (Details) $ in Millions	Sep. 10, 2018USD ($)
Business Combinations [Abstract]
Cash paid in acquisition	$ 18.2
Cost basis in investment	0.5
Acquisition-related costs	$ 0.4
Useful life of intangible asset	3 years

Business Acquisition - Allocati

Business Acquisition - Allocation of Purchase Price (Details) - USD ($) $ in Thousands	Sep. 30, 2018	[1]	Sep. 10, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 36,270			$ 25,894
Workpop Inc.
Business Acquisition [Line Items]
Cash and cash equivalents			$ 115
Other assets			68
Intangible assets - developed technology			7,500
Goodwill			10,525
Total purchase price			$ 18,208
[1]	See Note 1 for summary of adjustments.

Net Loss Per Share - Basic and

Net Loss Per Share - Basic and Diluted Loss Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018	[1]	Sep. 30, 2017	Sep. 30, 2018	[1]	Sep. 30, 2017
Earnings Per Share [Abstract]
Net loss	$ (2,447)	[2]	$ (14,855)	$ (30,670)	[2],[3]	$ (52,331)
Weighted average common shares outstanding, basic and diluted (in shares)	58,699		57,627	57,994		57,072
Net loss per share, basic and diluted (USD per share)	$ (0.04)		$ (0.26)	$ (0.53)		$ (0.92)
[1]	See Note 1 for summary of adjustments.
[2]	See Note 1 for summary of adjustments.
[3]	See Note 1 for additional information.

Net Loss Per Share - Anti-dilut

Net Loss Per Share - Anti-dilutive Shares Excluded From Calculation of Diluted Net Loss Per (Detail) - shares shares in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total shares excluded from net loss per share (in shares)	22,489	20,574
Options to purchase common stock, restricted stock units and performance-based restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total shares excluded from net loss per share (in shares)	10,575	11,112
Shares issuable pursuant to employee stock purchase plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total shares excluded from net loss per share (in shares)	89	98
Convertible notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total shares excluded from net loss per share (in shares)	7,143	4,682
Common stock warrants | Common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total shares excluded from net loss per share (in shares)	4,682	4,682

Investments - Marketable Securi

Investments - Marketable Securities (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018USD ($)security	Dec. 31, 2017USD ($)security
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	$ 358,620	$ 633,037
Unrealized Gains	5	0
Unrealized Losses	(397)	(650)
Fair Value	$ 358,228	$ 632,387
Weighted average term of maturity	6 months
Number of positions in a continuous unrealized loss (securities) | security	0	0
Cash Equivalent
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 103,789	$ 368,859
Investments
Debt Securities, Available-for-sale [Line Items]
Fair Value	254,439	263,528
Money market funds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	93,789	358,859
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	93,789	358,859
Money market funds | Cash Equivalent
Debt Securities, Available-for-sale [Line Items]
Fair Value	93,789	358,859
Money market funds | Investments
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
Certificate of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	10,000	10,000
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	10,000	10,000
Certificate of deposit | Cash Equivalent
Debt Securities, Available-for-sale [Line Items]
Fair Value	10,000	10,000
Certificate of deposit | Investments
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	67,614	74,868
Unrealized Gains	5	0
Unrealized Losses	(121)	(220)
Fair Value	67,498	74,648
Corporate bonds | Cash Equivalent
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
Corporate bonds | Investments
Debt Securities, Available-for-sale [Line Items]
Fair Value	67,498	74,648
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	187,217	189,310
Unrealized Gains	0	0
Unrealized Losses	(276)	(430)
Fair Value	186,941	188,880
U.S. treasury securities | Cash Equivalent
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
U.S. treasury securities | Investments
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 186,941	$ 188,880

Investments - Strategic Investm

Investments - Strategic Investments (Details) - Strategic Investments - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017
Debt and Equity Securities, FV-NI [Line Items]
Investments in privately-held companies	$ 2,000,000	$ 2,000,000
Strategic investments sold	$ (500,000)	(1,000,000)
Impairment of investments		0	$ 600,000
Workpop Inc.
Debt and Equity Securities, FV-NI [Line Items]
Strategic investments sold		$ (500,000)

Intangible Assets And Goodwil_2

Intangible Assets And Goodwill - Gross Carrying Amount and Accumulated Amortization of Finite-lived Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 7,500	$ 31,638
Accumulated Amortization	(208)	(31,638)
Net Carrying Amount	7,292	0
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,500	29,984
Accumulated Amortization	(208)	(29,984)
Net Carrying Amount	7,292	0
Software license rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	0	1,654
Accumulated Amortization	0	(1,654)
Net Carrying Amount	$ 0	$ 0

Intangible Assets And Goodwil_3

Intangible Assets And Goodwill - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization expense from finite-lived intangible assets		$ 0.2	$ 2.2	$ 0.2	$ 6.6
Developed technology
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 7.5

Intangible Assets And Goodwil_4

Intangible Assets And Goodwill - Estimated Remaining Intangible Asset Amortization (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2018	$ 625
2,019	2,500
2,020	2,500
2,021	1,667
Net Carrying Amount	$ 7,292	$ 0

Intangible Assets And Goodwil_5

Intangible Assets And Goodwill - Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018USD ($)
Goodwill [Roll Forward]
Goodwill as of December 31, 2017	$ 25,894
Goodwill from Workpop acquisition	10,376
Goodwill as of September 30, 2018	$ 36,270	[1]
[1]	See Note 1 for summary of adjustments.

Fair Value Of Financial Instr_3

Fair Value Of Financial Instruments - Summary of Asset and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 358,228	$ 632,387
Fair value measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	103,789	368,859
Assets measured at fair value on a recurring basis	358,228	632,387
Fair value measurements, recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	93,789	358,859
Assets measured at fair value on a recurring basis	93,789	358,859
Fair value measurements, recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	10,000	10,000
Assets measured at fair value on a recurring basis	264,439	273,528
Fair value measurements, recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Assets measured at fair value on a recurring basis	0	0
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	67,498	74,648
Corporate bonds | Fair value measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	67,498	74,648
Corporate bonds | Fair value measurements, recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Corporate bonds | Fair value measurements, recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	67,498	74,648
Corporate bonds | Fair value measurements, recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
U.S. treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	186,941	188,880
U.S. treasury securities | Fair value measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	186,941	188,880
U.S. treasury securities | Fair value measurements, recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
U.S. treasury securities | Fair value measurements, recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	186,941	188,880
U.S. treasury securities | Fair value measurements, recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 0	$ 0

Fair Value Of Financial Instr_4

Fair Value Of Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market fund value	$ 93,800	$ 358,900
Convertible Senior Notes At 5.75%, Maturing 2021 | Convertible notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of convertible debt	370,000
Fair value measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	103,789	368,859
Fair value measurements, recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 10,000	$ 10,000

Debt - Additional Information (

Debt - Additional Information (Detail)	Jun. 17, 2013USD ($)$ / sharesshares	Dec. 31, 2017USD ($)$ / shares	Sep. 30, 2018USD ($)	Jul. 01, 2018USD ($)	Sep. 30, 2017	Dec. 31, 2013USD ($)
Debt Instrument [Line Items]
Proceeds from warrants issuance	$ 23,200,000
Number of shares that can be acquired by warrants holders (in shares) | shares	4,700,000
Warrant strike price (USD per share) | $ / shares	$ 80.06
Convertible notes
Debt Instrument [Line Items]
Debt interest rate			1.50%		5.75%
Transaction costs related to the issuance of Notes		$ 9,617,000	$ 7,298,000
Debt discount recorded		(10,190,000)	(4,746,000)
Senior Convertible Notes At 1.50%, Maturing 2018 | Convertible notes
Debt Instrument [Line Items]
Debt gross proceeds						$ 253,000,000
Principal amount of debt repaid				$ 253,000,000
Debt interest rate	1.50%
Convertible senior notes	$ 214,300,000
Adjustment to additional paid-in capital for the equity portion of the convertible note	(38,700,000)
Transaction costs related to the issuance of Notes	7,300,000
Deferred debt issuance cost	6,200,000
Equity issuance cost	$ 1,100,000
Conversion price (USD per share) | $ / shares	$ 54.04
Proceeds from issuance of convertible notes	$ 245,700,000
Payments for note hedges	$ (49,500,000)
Number of shares covered by the Note Hedge (in shares) | shares	4,700,000
Convertible Senior Notes At 5.75%, Maturing 2021 | Convertible notes
Debt Instrument [Line Items]
Debt gross proceeds		$ 300,000,000
Debt interest rate		5.75%
Transaction costs related to the issuance of Notes			$ 9,200,000
Effective interest rate		98.00%	6.40%
Net proceeds from the Notes		$ 294,000,000
Initial conversion rate		23.8095
Conversion price (USD per share) | $ / shares		$ 42
Debt discount recorded		$ (6,000,000)
Proceeds from issuance of convertible notes		$ 284,900,000

Debt - Summary of Net Carrying

Debt - Summary of Net Carrying Amount of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018		Dec. 31, 2017
Debt Instrument [Line Items]
Net carrying amount	$ 287,956	[1]	$ 285,168
Convertible Debt
Debt Instrument [Line Items]
Principal amount	300,000		553,000
Unamortized debt discount	(4,746)		(10,190)
Net carrying amount before unamortized debt issuance costs	295,254		542,810
Unamortized debt issuance costs	(7,298)		(9,617)
Net carrying amount	$ 287,956		$ 533,193
[1]	See Note 1 for summary of adjustments.

Debt - Schedule of Interest Exp

Debt - Schedule of Interest Expense Recognized (Details) - Convertible Debt - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Schedule of Debt Cost and Interest Expense Recognized [Line Items]
Debt interest rate	1.50%	5.75%	1.50%	5.75%
Contractual interest expense at 1.5% and 5.75% per annum	$ 4,313	$ 949	$ 14,835	$ 2,847
Amortization of debt issuance costs	604	334	2,474	990
Accretion of debt discount	392	2,078	5,444	6,159
Total	$ 5,309	$ 3,361	$ 22,753	$ 9,996

Stockholders' Equity (Details)

Stockholders' Equity (Details) - USD ($) $ / shares in Units, shares in Thousands	1 Months Ended	2 Months Ended	3 Months Ended			11 Months Ended	12 Months Ended
	Nov. 02, 2018	Dec. 31, 2017	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2018	Nov. 02, 2018	Nov. 30, 2017
Equity [Abstract]
Authorized share repurchase program amount								$ 100,000,000
Class of Stock [Line Items]
Shares repurchased (in shares)		635	300	444	423	1,802
Average cost of shares repurchased (USD per share)		$ 35.55	$ 53.82	$ 46.66	$ 37.84	$ 41.86
Total expenditure for repurchase		$ 22,599,000	$ 16,143,000	$ 20,718,000	$ 16,024,000	$ 75,484,000
Remaining amount available under program			$ 24,516,000			$ 24,516,000
Subsequent Event
Class of Stock [Line Items]
Shares repurchased (in shares)	307						2,109
Average cost of shares repurchased (USD per share)	$ 51.62						$ 43.28
Total expenditure for repurchase	$ 15,867,000						$ 91,351,000
Remaining amount available under program	$ 8,649,000						$ 8,649,000

Stock-Based Awards - Stock Opti

Stock-Based Awards - Stock Option Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Shares
Beginning balance (in shares)	5,432
Options, Granted (in shares)	0
Options, Exercised (in shares)	(1,173)
Options, Forfeited (in shares)	(121)
Ending balance (in shares)	4,138
Weighted- Average Exercise Price
Weighted-average exercise price, outstanding at beginning of period (USD per share)	$ 32.73
Weighted average exercise price, granted (USD per share)	0
Weighted average exercise price, exercised (USD per share)	33.04
Weighted average exercise price, forfeited (USD per share)	43.94
Weighted-average exercise price, outstanding at end of period (USD per share)	$ 32.31
Additional Disclosures
Weighted-average remaining contractual term, outstanding	4 years 3 months 18 days	5 years 4 months 5 days
Aggregate intrinsic value, outstanding	$ 101,132		$ 42,282
Exercisable at end of period (in shares)	4,065
Weighted average exercise price, exercisable at end of period (USD per share)	$ 32.26
Weighted-average remaining contractual term, exercisable	4 years 3 months 18 days
Aggregate intrinsic value, exercisable at end of period	$ 99,546
Vested and Expected to Vest
Vested and expected to vest at end of period (in shares)	4,134
Weighted average exercise price, vested and expected to vest at end of period (USD per share)	$ 32.31
Weighted-average remaining contractual term, vested and expected to vest	4 years 3 months 18 days
Aggregate intrinsic value, vested and expected to vest at end of period	$ 101,066
Closing stock price (USD per share)	$ 56.75		$ 35.33

Stock-Based Awards - Additional

Stock-Based Awards - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Unrecognized compensation expense relating to stock options	$ 900,000		$ 900,000
Share based compensation expense	$ 15,531,000	$ 17,582,000	$ 51,042,000	$ 51,029,000
Percent purchase price, grant date, ESPP			85.00%
Percent purchase price, exercise date, ESPP			85.00%
Employee Stock Option
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Unrecognized compensation expense, expected recognition weighted average period			10 months 24 days
Restricted Stock Units (RSUs)
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Unrecognized compensation expense, expected recognition weighted average period			2 years 10 months 28 days
Restricted stock units granted (in shares)			1,725,385
Share of non-vested restricted stock units were outstanding (in shares)	3,906,639		3,906,639
Unrecognized compensation expense related to non-vested restricted stock units	$ 122,800,000		$ 122,800,000
Performance Shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Unrecognized compensation expense, expected recognition weighted average period			3 years 6 months 26 days
Share based compensation expense	1,700,000	$ 3,900,000
Awarded 2016 and 2017 | Performance Shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Unrecognized compensation expense related to performance shares	0		$ 0
Awarded 2018 | Performance Shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Unrecognized compensation expense related to performance shares	$ 20,100,000		$ 20,100,000

Stock-Based Awards - Issuance o

Stock-Based Awards - Issuance of Awards Under New Compensation Award Structure (Details) - Performance Shares - $ / shares	1 Months Ended
	Apr. 30, 2018	Feb. 28, 2018	Mar. 31, 2017	Jul. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term			3 years	3 years
Grant date fair value (USD per share)			$ 41.73	$ 38.67
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accounting grant date (in shares)			185,270	166,600
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accounting grant date (in shares)			555,810	499,800
Performance Period One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term	3 years	3 years
Grant date fair value (USD per share)	$ 39.54	$ 40.64
Performance Period One | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accounting grant date (in shares)	3,572	121,764
Performance Period One | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accounting grant date (in shares)	8,930	304,410
Performance Period Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term	5 years	5 years
Grant date fair value (USD per share)	$ 39.54	$ 40.64
Performance Period Two | Third Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting right percentage		33.00%
Performance Period Two | Fourth Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting right percentage		33.00%
Performance Period Two | Fifth Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting right percentage		33.00%
Performance Period Two | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accounting grant date (in shares)	53,572	411,412
Performance Period Two | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accounting grant date (in shares)	133,930	1,028,530

Stock-Based Awards - Stock-Base

Stock-Based Awards - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share based compensation expense	$ 15,531	$ 17,582	$ 51,042	$ 51,029
Cost of revenue
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share based compensation expense	1,082	1,216	3,105	3,629
Sales and marketing
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share based compensation expense	5,927	7,988	18,718	21,534
Research and development
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share based compensation expense	3,212	2,641	7,937	7,140
General and administrative
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share based compensation expense	5,268	5,737	15,055	18,726
Restructuring
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share based compensation expense	$ 42	$ 0	$ 6,227	$ 0

Income Taxes (Detail)

Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018		Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income tax provision	$ (522)	[1]	$ (503)	$ (1,591)	[1]	$ (1,438)
Effective income tax rate	(27.10%)		(3.50%)	(5.50%)		(2.80%)
Potential reduction in unrecognized tax benefit				$ 1,100
[1]	See Note 1 for summary of adjustments.

Restructuring Costs (Details)

Restructuring Costs (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended			9 Months Ended
	Dec. 31, 2017	Sep. 30, 2018		Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017
Restructuring and Related Activities [Abstract]
Workforce reduction percent	6.00%
Restructuring Cost and Reserve [Line Items]
Restructuring expense		$ 221	[1]	$ 0	$ 8,946	[1]	$ 0
Restructuring expense incurred		10,500			10,500
Stock-Based Compensation Expense
Restructuring Cost and Reserve [Line Items]
Restructuring expense					6,200
Restructuring expense incurred		6,200			6,200
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring expense		200			2,700
Restructuring expense incurred		$ 4,300			$ 4,300
[1]	See Note 1 for summary of adjustments.

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Millions	Sep. 30, 2018USD ($)
Commitments and Contingencies Disclosure [Abstract]
Operating leases, future minimum payments due in next twelve months	$ 0.5
Operating leases, future minimum payments due in year two	6.9
Operating leases, future minimum payments due in year three	7.2
Operating leases, future minimum payments due in year four	7.5
Operating leases, future minimum payments due in year five	7.8
Operating leases, future minimum payments due thereafter	$ 8.5

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Related Party Transactions [Abstract]
Services provided to related party at no charge	$ 0.9	$ 0.9	$ 2.8	$ 2.6

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ in Millions	Nov. 08, 2018	Sep. 10, 2018	Nov. 08, 2018	Sep. 30, 2018
Subsequent Event [Line Items]
All-cash acquisition transaction price		$ 18.2
Restricted Stock Units (RSUs)
Subsequent Event [Line Items]
Restricted stock units granted (in shares)				1,725,385
Subsequent Event
Subsequent Event [Line Items]
All-cash acquisition transaction price	$ 24
Subsequent Event | Restricted Stock Units (RSUs)
Subsequent Event [Line Items]
Restricted stock units granted (in shares)			420,757
Share-based payment award, award vesting period			4 years