RingCentral (RNG) 10-Q 9 Nov 20 2020 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2020	Nov. 04, 2020
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	001-36089
Entity Registrant Name	RingCentral, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	94-3322844
Entity Address, Address Line One	20 Davis Drive
Entity Address, City or Town	Belmont
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94002
City Area Code	650
Local Phone Number	472-4100
Title of 12(b) Security	Class A Common Stock
Trading Symbol	RNG
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001384905
Current Fiscal Year End Date	--12-31
Class A common stock
Document Information [Line Items]
Entity Common Stock Outstanding (in shares)		79,327,759
Class B common stock
Document Information [Line Items]
Entity Common Stock Outstanding (in shares)		10,303,948

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 745,558	$ 343,606
Accounts receivable, net	153,583	129,990
Deferred and prepaid sales commission costs	53,212	36,589
Prepaid expenses and other current assets	40,251	25,354
Total current assets	992,604	535,539
Property and equipment, net	132,967	89,230
Operating lease right-of-use assets	50,414	39,269
Long-term investments	173,641	132,188
Deferred and prepaid sales commission costs, non-current	599,759	462,344
Goodwill	56,223	55,278
Acquired intangibles, net	101,894	127,338
Other assets	8,812	9,561
Total assets	2,116,314	1,450,747
Current liabilities
Accounts payable	38,002	34,612
Accrued liabilities	189,555	138,729
Current portion of convertible senior notes, net	14,156	0
Deferred revenue	127,500	107,372
Total current liabilities	369,213	280,713
Convertible senior notes, net	1,394,898	386,889
Operating lease liabilities	37,973	28,516
Other long-term liabilities	14,555	8,929
Total liabilities	1,816,639	705,047
Commitments and contingencies (Note 8)
Temporary equity (Note 6)	1,934	0
Stockholders' equity
Common stock	9	9
Additional paid-in capital	664,689	1,033,053
Accumulated other comprehensive income	3,522	1,948
Accumulated deficit	(370,479)	(289,310)
Total stockholders' equity	297,741	745,700
Total liabilities, temporary equity and stockholders’ equity	$ 2,116,314	$ 1,450,747

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues
Total revenues	$ 303,624	$ 233,352	$ 849,121	$ 649,993
Cost of revenues
Total cost of revenues	82,314	59,705	232,395	164,170
Gross profit	221,310	173,647	616,726	485,823
Operating expenses
Research and development	48,481	35,286	132,910	97,705
Sales and marketing	152,986	109,882	421,931	313,023
General and administrative	49,513	39,142	146,381	100,401
Total operating expenses	250,980	184,310	701,222	511,129
Loss from operations	(29,670)	(10,663)	(84,496)	(25,306)
Other income (expense), net
Interest expense	(12,680)	(5,160)	(32,780)	(15,280)
Other income, net	21,824	2,926	36,910	9,118
Other income (expense), net	9,144	(2,234)	4,130	(6,162)
Loss before income taxes	(20,526)	(12,897)	(80,366)	(31,468)
Provision for (benefit from) income taxes	431	(148)	803	(3,118)
Net loss	$ (20,957)	$ (12,749)	$ (81,169)	$ (28,350)
Net loss per common share
Basic and diluted (in dollars per share)	$ (0.24)	$ (0.15)	$ (0.92)	$ (0.34)
Weighted-average number of shares used in computing net loss per share
Basic and diluted (in shares)	89,173	83,283	88,259	82,348
Subscriptions
Revenues
Total revenues	$ 279,639	$ 210,906	$ 779,781	$ 588,406
Cost of revenues
Total cost of revenues	60,531	40,930	169,685	114,343
Other
Revenues
Total revenues	23,985	22,446	69,340	61,587
Cost of revenues
Total cost of revenues	$ 21,783	$ 18,775	$ 62,710	$ 49,827

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (20,957)	$ (12,749)	$ (81,169)	$ (28,350)
Other comprehensive income (loss)
Foreign currency translation adjustments	2,420	(1,742)	1,574	(1,875)
Comprehensive loss	$ (18,537)	$ (14,491)	$ (79,595)	$ (30,225)

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Stockholders' equity, beginning balance (in shares) at Dec. 31, 2018		81,046
Stockholders' equity, beginning balance at Dec. 31, 2018	$ 317,609	$ 8	$ 551,078	$ 2,226	$ (235,703)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with Equity Incentive and Employee Stock Purchase plans, net of tax withholdings (in shares)		782
Issuance of common stock in connection with Equity Incentive and Employee Stock Purchase plans, net of tax withholdings	732		732
Share-based compensation	19,616		19,616
Changes in other comprehensive loss	(375)			(375)
Net loss	(6,358)				(6,358)
Stockholders' equity, ending balance (in shares) at Mar. 31, 2019		81,828
Stockholders' equity, ending balance at Mar. 31, 2019	331,224	$ 8	571,426	1,851	(242,061)
Stockholders' equity, beginning balance (in shares) at Dec. 31, 2018		81,046
Stockholders' equity, beginning balance at Dec. 31, 2018	317,609	$ 8	551,078	2,226	(235,703)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(28,350)
Stockholders' equity, ending balance (in shares) at Sep. 30, 2019		83,776
Stockholders' equity, ending balance at Sep. 30, 2019	369,494	$ 8	633,188	351	(264,053)
Stockholders' equity, beginning balance (in shares) at Mar. 31, 2019		81,828
Stockholders' equity, beginning balance at Mar. 31, 2019	331,224	$ 8	571,426	1,851	(242,061)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with Equity Incentive and Employee Stock Purchase plans, net of tax withholdings (in shares)		1,046
Issuance of common stock in connection with Equity Incentive and Employee Stock Purchase plans, net of tax withholdings	7,730		7,730
Share-based compensation	25,614		25,614
Changes in other comprehensive loss	242			242
Net loss	(9,243)				(9,243)
Stockholders' equity, ending balance (in shares) at Jun. 30, 2019		82,874
Stockholders' equity, ending balance at Jun. 30, 2019	355,567	$ 8	604,770	2,093	(251,304)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with Equity Incentive and Employee Stock Purchase plans, net of tax withholdings (in shares)		902
Issuance of common stock in connection with Equity Incentive and Employee Stock Purchase plans, net of tax withholdings	(1,116)		(1,116)
Share-based compensation	29,534		29,534
Changes in other comprehensive loss	(1,742)			(1,742)
Net loss	(12,749)				(12,749)
Stockholders' equity, ending balance (in shares) at Sep. 30, 2019		83,776
Stockholders' equity, ending balance at Sep. 30, 2019	369,494	$ 8	633,188	351	(264,053)
Stockholders' equity, beginning balance (in shares) at Dec. 31, 2019		86,940
Stockholders' equity, beginning balance at Dec. 31, 2019	745,700	$ 9	1,033,053	1,948	(289,310)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with Equity Incentive and Employee Stock Purchase plans, net of tax withholdings (in shares)		875
Issuance of common stock in connection with Equity Incentive and Employee Stock Purchase plans, net of tax withholdings	(5,549)		(5,549)
Share-based compensation	37,001		37,001
Equity component from partial repurchase of 2023 convertible senior notes	(355,932)		(355,932)
Purchase of capped calls related to convertible senior notes	(60,900)		(60,900)
Equity component of convertible senior notes, net of issuance costs	192,442		192,442
Changes in other comprehensive loss	(1,617)			(1,617)
Net loss	(60,721)				(60,721)
Stockholders' equity, ending balance (in shares) at Mar. 31, 2020		87,815
Stockholders' equity, ending balance at Mar. 31, 2020	490,424	$ 9	840,115	331	(350,031)
Stockholders' equity, beginning balance (in shares) at Dec. 31, 2019		86,940
Stockholders' equity, beginning balance at Dec. 31, 2019	745,700	$ 9	1,033,053	1,948	(289,310)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(81,169)
Stockholders' equity, ending balance (in shares) at Sep. 30, 2020		89,585
Stockholders' equity, ending balance at Sep. 30, 2020	297,741	$ 9	664,689	3,522	(370,479)
Stockholders' equity, beginning balance (in shares) at Mar. 31, 2020		87,815
Stockholders' equity, beginning balance at Mar. 31, 2020	490,424	$ 9	840,115	331	(350,031)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with Equity Incentive and Employee Stock Purchase plans, net of tax withholdings (in shares)		870
Issuance of common stock in connection with Equity Incentive and Employee Stock Purchase plans, net of tax withholdings	8,550		8,550
Share-based compensation	52,129		52,129
Equity component from partial repurchase of 2023 convertible senior notes	(4,051)		(4,051)
Temporary equity reclassification	(6,756)		(6,756)
Changes in other comprehensive loss	771			771
Net loss	509				509
Stockholders' equity, ending balance (in shares) at Jun. 30, 2020		88,685
Stockholders' equity, ending balance at Jun. 30, 2020	541,576	$ 9	889,987	1,102	(349,522)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with Equity Incentive and Employee Stock Purchase plans, net of tax withholdings (in shares)		580
Issuance of common stock in connection with Equity Incentive and Employee Stock Purchase plans, net of tax withholdings	(6,576)		(6,576)
Share-based compensation	53,640		53,640
Equity component of convertible senior notes, net of issuance costs (in shares)		320
Equity component from partial repurchase of 2023 convertible senior notes	(372,227)		(372,227)
Purchase of capped calls related to convertible senior notes	(41,795)		(41,795)
Equity component of convertible senior notes, net of issuance costs	136,838		136,838
Temporary equity reclassification	4,822		4,822
Changes in other comprehensive loss	2,420			2,420
Net loss	(20,957)				(20,957)
Stockholders' equity, ending balance (in shares) at Sep. 30, 2020		89,585
Stockholders' equity, ending balance at Sep. 30, 2020	$ 297,741	$ 9	$ 664,689	$ 3,522	$ (370,479)

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities
Net loss	$ (81,169)	$ (28,350)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	53,563	26,060
Share-based compensation	137,410	71,690
Amortization of deferred and prepaid sales commission costs	33,060	21,189
Amortization of debt discount and issuance costs	32,613	15,149
Loss on early extinguishment of debt	12,323	0
Repayment of convertible senior notes attributable to debt discount	(32,640)	0
Reduction of operating lease right-of-use assets	11,478	10,166
Unrealized gain and other related costs on investments	(41,453)	0
Foreign currency remeasurement (gain) loss	63	61
Provision for bad debt	3,909	2,339
Deferred income taxes	(267)	(632)
Tax benefit from release of valuation allowance	0	(3,210)
Other	203	1,925
Changes in assets and liabilities:
Accounts receivable	(27,502)	(24,845)
Deferred and prepaid sales commission costs	(183,745)	(51,467)
Prepaid expenses and other current assets	(14,613)	(8,125)
Other assets	322	400
Accounts payable	5,180	10,626
Accrued liabilities	41,530	22,432
Deferred revenue	20,128	16,632
Operating lease liabilities	(11,019)	(10,507)
Other liabilities	7,919	(525)
Net cash (used in) provided by operating activities	(32,707)	71,008
Cash flows from investing activities
Purchases of property and equipment	(33,992)	(21,355)
Capitalized internal-use software	(28,049)	(11,472)
Cash paid for business combination, net of cash acquired	0	(27,870)
Net cash used in investing activities	(62,041)	(60,697)
Cash flows from financing activities
Proceeds from issuance of convertible senior notes, net of issuance costs	1,627,209	0
Payments for 2023 convertible senior notes partial repurchase	(1,019,813)	0
Payments for capped calls and transaction costs	(102,695)	0
Proceeds from issuance of stock in connection with stock plans	24,123	17,590
Payments for taxes related to net share settlement of equity awards	(27,698)	(10,244)
Payment for contingent consideration for business acquisition	(3,548)	0
Repayment of financing obligations	(1,215)	(943)
Net cash provided by financing activities	496,363	6,403
Effect of exchange rate changes	337	(380)
Net increase (decrease) in cash, cash equivalents and restricted cash	401,952	16,334
Cash, cash equivalents and restricted cash
Beginning of period	343,606	566,329
End of period	745,558	582,663
Supplemental disclosure of cash flow data
Cash paid for interest	190	189
Cash paid for income taxes, net of refunds	512	718
Non-cash investing and financing activities
Cash held for future indemnity claims and other potential future payments	0	7,148
Equipment and capitalized internal-use software purchased and unpaid at period end	$ 7,879	$ 4,861

Description of Business and Sum

Description of Business and Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Summary of Significant Accounting Policies	Description of Business and Summary of Significant Accounting Policies Description of Business RingCentral, Inc. (the “Company”) is a provider of software-as-a-service (“SaaS”) solutions that enables businesses to communicate, collaborate and connect. The Company was incorporated in California in 1999 and was reincorporated in Delaware on September 26, 2013. Basis of Presentation and Consolidation The Company's unaudited condensed consolidated financial statements and accompanying notes reflect all adjustments (all of which are normal, recurring in nature and those discussed in these notes) that are, in the opinion of management, necessary for a fair presentation of the interim periods presented. All intercompany balances and transactions have been eliminated in consolidation. The results of operations for the interim periods presented are not necessarily indicative of the results to be expected for any subsequent quarter or for the entire year ending December 31, 2020. Certain information and note disclosures normally included in annual consolidated financial statements prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) have been condensed or omitted under the rules and regulations of the Securities and Exchange Commission (“SEC”). The unaudited condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019, filed with the SEC on February 26, 2020. Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements, and the reported amounts of revenues and expenses during the reporting period. The significant estimates made by management affect revenues, the allowance for doubtful accounts, valuation of long-term investments, deferred sales commission costs, goodwill, useful lives of intangible assets, share-based compensation, capitalization of internally developed software, liability and equity allocation of convertible senior notes, return reserves, provision for income taxes, uncertain tax positions, loss contingencies, sales tax liabilities, and accrued liabilities. Management periodically evaluates these estimates and will make adjustments prospectively based upon the results of such periodic evaluations. Actual results may differ from these estimates. In March 2020, the World Health Organization declared the outbreak of the novel strain of coronavirus (“COVID-19”) as a global pandemic with widespread and detrimental effect on the global economy. The extent of the impact of COVID-19 on the Company's operational and financial performance will depend on certain developments, including the duration and spread of the outbreak, impact on the Company's customers and sales cycles, and its employees, all of which are uncertain and cannot be predicted. As of the date of issuance of these financial statements, the Company is not aware of any specific event or circumstance that would require updating significant estimates or judgments or revising the carrying value of the Company's assets or liabilities as presented in the unaudited interim condensed consolidated financial statements. These estimates may change as new events occur and additional information is obtained. Actual results could differ materially from these estimates. Recent Accounting Pronouncements Not Yet Adopted In December 2019, the Financial Accounting Standard Board ("FASB") issued Accounting Standard Update ("ASU") No. 2019-12, Accounting Standards Update (Topic 740): Simplifying the Accounting for Income Taxes. The ASU removes certain exceptions for recognizing deferred taxes for investments, performing intraperiod allocation and calculating income taxes in interim periods. The ASU also adds guidance to reduce complexity in certain areas, including recognizing deferred taxes for goodwill and allocating taxes to members of a consolidated group. The ASU is effective for calendar year-end public entities on January 1, 2021. Entities may early adopt the ASU in any interim period for which financial statements have not yet been issued (or made available for issuance). The Company has not yet adopted the new guidance. The adoption is not expected to have a material impact on the Company's condensed consolidated financial statements. In March 2020, the FASB issued optional guidance for a limited time to ease the potential burden in accounting for or recognizing the effects of reference rate reform, particularly, the risk of cessation of the London Interbank Offered Rate ("LIBOR") on financial reporting. The guidance provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The amendments are elective and are effective upon issuance for all entities through December 31, 2022. The Company is currently evaluating the impact of the new guidance. In August 2020, the FASB issued ASU No. 2020-06, Accounting for Convertible Instruments and Contracts in an Entity's Own Equity , which simplifies the accounting for certain convertible instruments, amends the guidance on derivative scope exceptions for contracts in an entity's own equity, and modifies the guidance on diluted earnings per share calculations as a result of these changes. This new standard is effective for public entities for fiscal years beginning after December 15, 2021, and interim periods within those fiscal years. The amendment is to be adopted through either a fully retrospective or modified retrospective method of transition. Early adoption is permitted. The Company is currently evaluating the impact of the new guidance on its condensed consolidated financial statements.

Revenue and Cost of Revenue

Revenue and Cost of Revenue	9 Months Ended
	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Revenue and Cost of Revenue	Revenue and Cost of Revenue The Company derives its revenues primarily from subscriptions, sale of products, and professional services. Revenues are recognized when control of these products and services are transferred to the customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those products and services. Disaggregation of revenue The following table provides information about disaggregated revenue by primary geographical markets: Three Months Ended Nine Months Ended 2020 2019 2020 2019 Primary geographical markets North America 92 % 94 % 92 % 94 % Others 8 6 8 6 Total revenues 100 % 100 % 100 % 100 % The Company derived over 90% of subscription revenues from RingCentral Office product for both of the three and nine months ended September 30, 2020 and 2019. Deferred revenue During the three and nine months ended September 30, 2020, the Company recognized revenue of $14.5 million and $102.5 million, respectively, that was included in the corresponding deferred revenue balance at the beginning of the year. Remaining performance obligations The typical subscription term ranges from one month to five years. Contracted revenue as of September 30, 2020 that has not yet been recognized was approximately $1.2 billion. This excludes contracts with an original expected length of less than one year. Of these remaining performance obligations, the Company expects to recognize revenue of 54% of this balance over the next 12 months and 46% thereafter. Other revenues and cost of revenues Other revenues are primarily comprised of product revenue from the sale of pre-configured phones, professional services, and phone rentals. Product revenues were $11.3 million and $11.5 million for the three months ended September 30, 2020 and 2019, respectively, and $31.5 million and $30.1 million for the nine months ended September 30, 2020 and 2019, respectively. Cost of product revenues were $10.2 million and $10.4 million for the three months ended September 30, 2020 and 2019, respectively, and $29.8 million and $27.4 million for the nine months ended September 30, 2020 and 2019, respectively.

Financial Statement Components

Financial Statement Components	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Financial Statement Components	Financial Statement Components Cash and cash equivalents consisted of the following (in thousands): September 30, 2020 December 31, 2019 Cash $ 102,431 $ 46,295 Money market funds 643,127 297,311 Total cash and cash equivalents $ 745,558 $ 343,606 Accounts receivable, net consisted of the following (in thousands): September 30, 2020 December 31, 2019 Accounts receivable $ 133,363 $ 114,745 Unbilled accounts receivable 25,433 17,603 Allowance for doubtful accounts (5,213) (2,358) Accounts receivable, net $ 153,583 $ 129,990 Prepaid expenses and other current assets consisted of the following (in thousands): September 30, 2020 December 31, 2019 Prepaid expenses $ 19,759 $ 16,249 Inventory 673 401 Other current assets 19,819 8,704 Total prepaid expenses and other current assets $ 40,251 $ 25,354 Property and equipment, net consisted of the following (in thousands): September 30, 2020 December 31, 2019 Computer hardware and software $ 159,970 $ 120,841 Internal-use software development costs 79,277 48,419 Furniture and fixtures 8,131 7,690 Leasehold improvements 12,662 11,327 Total property and equipment, gross 260,040 188,277 Less: accumulated depreciation and amortization (127,073) (99,047) Property and equipment, net $ 132,967 $ 89,230 Total depreciation and amortization expense related to property and equipment was $10.5 million and $7.3 million for the three months ended September 30, 2020 and 2019, respectively, and $27.8 million and $19.6 million for the nine months ended September 30, 2020 and 2019, respectively. During the nine months ended September 30, 2020, the Company financed $4.7 million of property, equipment and software licenses through vendor financing arrangements at interest rates ranging up to 3.95% to be repaid over a three-year term. As of September 30, 2020, $3.2 million of the related equipment is collateralized under the vendor financing arrangement. The financing arrangements and the assets purchased under these arrangements are non-cash investing and financing activities. The carrying value of goodwill is as follows (in thousands): Balance at December 31, 2019 $ 55,278 Foreign currency translation adjustments 945 Balance at September 30, 2020 $ 56,223 The carrying values of intangible assets are as follows (in thousands): September 30, 2020 December 31, 2019 Estimated Lives Cost Accumulated Acquired Cost Accumulated Acquired Customer relationships 2 to 5 years $ 21,636 $ 11,138 $ 10,498 $ 21,245 $ 8,178 $ 13,067 Developed technology 3 to 5 years 123,681 32,285 91,396 123,547 9,276 114,271 Total acquired intangible assets $ 145,317 $ 43,423 $ 101,894 $ 144,792 $ 17,454 $ 127,338 Amortization expense from acquired intangible assets for the three months ended September 30, 2020 and 2019 was $8.6 million and $2.3 million, respectively, and $25.8 million and $6.5 million for the nine months ended September 30, 2020 and 2019, respectively. Amortization of developed technology is included in cost of revenues and amortization of customer relationships is included in sales and marketing expenses in the Condensed Consolidated Statements of Operations. As of September 30, 2020, the weighted-average amortization period for developed technology is approximately 3.1 years and for customer relationships is approximately 2.2 years. Estimated amortization expense for acquired intangible assets for the following fiscal years is as follows (in thousands): 2020 (remaining) $ 8,532 2021 34,128 2022 28,522 2023 16,542 2024 onwards 14,170 Total estimated amortization expense $ 101,894 Accrued liabilities consisted of the following (in thousands): September 30, 2020 December 31, 2019 Accrued compensation and benefits $ 37,890 $ 30,541 Accrued sales, use, and telecom related taxes 28,354 25,757 Accrued marketing 29,485 17,505 Operating lease liabilities, short-term 16,407 14,249 Other accrued expenses 77,419 50,677 Total accrued liabilities $ 189,555 $ 138,729 Deferred and Prepaid Sales Commission Costs Amortization expense for the deferred and prepaid sales commission costs was $12.4 million and $8.0 million for the three months ended September 30, 2020 and 2019, respectively, and $33.1 million and $21.2 million for the nine months ended September 30, 2020 and 2019, respectively. There was no impairment loss in relation to the costs capitalized for the periods presented.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments The Company measures and reports certain cash equivalents, including money market funds and certificates of deposit, at fair value in accordance with the provisions of the authoritative accounting guidance that addresses fair value measurements. This guidance establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. The hierarchy is broken down into three levels based on the reliability of the inputs as follows: Level 1: Observable inputs that reflect unadjusted quoted prices in active markets for identical assets or liabilities. Level 2: Other inputs, such as quoted prices for similar assets or liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the asset or liability. Level 3: Unobservable inputs that are supported by little or no market activity and that are based on management’s assumptions, including fair value measurements determined by using pricing models, discounted cash flow methodologies or similar techniques. The financial assets carried at fair value were determined using the following inputs (in thousands): Fair Value at September 30, 2020 Level 1 Level 2 Level 3 Cash equivalents: Money market funds $ 643,127 $ 643,127 $ — $ — Noncurrent assets: Long-term investments $ 173,641 $ — $ — $ 173,641 Fair Value at December 31, 2019 Level 1 Level 2 Level 3 Cash equivalents: Money market funds $ 297,311 $ 297,311 $ — $ — Noncurrent assets: Long-term investments $ 132,188 $ — $ — $ 132,188 The Company’s other financial instruments, including accounts receivable, accounts payable, and other current liabilities, are carried at cost, which approximates fair-value due to the relatively short maturity of those instruments. Convertible Senior Notes During the three months ended September 30, 2020, the Company issued $650 million aggregate principal amount 0% convertible senior notes due 2026 (the “2026 Notes”) as described in Note 6. As of September 30, 2020, the fair value of the 0% convertible senior notes due 2026 was approximately $644.6 million. The fair value was determined based on the quoted price for the 2026 Notes in an inactive market on the last trading day of the reporting period and is considered as Level 2 in the fair value hierarchy. As of September 30, 2020, the fair value of the 0% convertible senior notes due 2025 (the “2025 Notes”) was approximately $1.1 billion. The fair value was determined based on the quoted price for the 2025 Notes in an inactive market on the last trading day of the reporting period and is considered as Level 2 in the fair value hierarchy. As of September 30, 2020, the fair value of the 0% convertible senior notes due 2023 (the “2023 Notes”) was approximately $341.9 million. The fair value was determined based on the quoted price for the 2023 Notes in an inactive market on the last trading day of the reporting period and is considered as Level 2 in the fair value hierarchy. Long-Term Investments As of September 30, 2020, the fair value of the Company's long-term investments in convertible and redeemable preferred stock was $173.6 million. The Company classifies its long-term investments as Level 3 in the fair value hierarchy based on the nature of the fair value inputs and judgment involved in the valuation process. The Company uses a lattice model to value these investments and relies on observable inputs including share-price, credit spread, and volatility. The model also incorporates judgments relating to the probability of special redemption triggers, the expected holding period of the investment and interest rates. These investments are reported at fair value in long-term investments in the Condensed Consolidated Balance Sheets. The Company's total net unrealized gain recorded in other income (expense), net, was $23.3 million and $38.6 million for the three and nine months ended September 30, 2020, respectively. Volatility in the global economic climate and financial markets, including the effects of COVID-19, could result in a significant change in the underlying share-price of the Company’s investees, resulting in a material change in the value of the long-term investments.

Business Combinations, Strategi

Business Combinations, Strategic Partnerships, and Asset Acquisitions	9 Months Ended
	Sep. 30, 2020
Business Combinations [Abstract]
Business Combinations, Strategic Partnerships, and Asset Acquisitions	Business Combinations, Strategic Partnerships, and Asset Acquisitions Connect First Acquisition On January 14, 2019, the Company acquired the equity interests of Connect First, Inc. (“Connect First”), a cloud-based outbound/blended customer engagement platform for midsize and enterprise companies. The acquisition complements the Company’s current Customer Engagement portfolio to provide differentiated customer experiences. The total purchase price of approximately $36.4 million consisted of cash of $29.3 million and $7.1 million held to cover indemnity claims made by the Company after the closing date. In connection with the acquisition, the Company granted $4.0 million in restricted stock units, which vests over four years. The allocation of the purchase price of the assets acquired and liabilities assumed based on their estimated fair values was as follows (in thousands): Cash and cash equivalents $ 1,427 Other tangible assets acquired 2,266 Acquired intangible assets 13,300 Goodwill 24,465 Total assets acquired 41,458 Liabilities assumed (5,013) Total consideration $ 36,445 The amortizable intangible assets have a weighted average useful life of three years. The purchase price exceeded the estimated fair value of the tangible and identifiable intangible assets and liabilities acquired and, as a result of the allocation, the Company recorded goodwill of $24.5 million, which is not deductible for tax purposes. The goodwill recognized is attributable primarily to contributions of the entity's technology to the overall corporate strategy, enhancements to the Company's contact center product offerings, and assembled workforce of the acquired business. Strategic Partnerships and Asset Purchases In October 2019, the Company entered into certain agreements for a strategic partnership with Avaya Holdings Corp. (“Avaya”) and its subsidiaries, including Avaya Inc. In connection with the strategic partnership, the Company purchased $125.0 million aggregate principal amount of 3% convertible and redeemable preferred stock, with a conversion price of $16.00 per share, representing an approximately 6% position in Avaya on an as-converted basis. The Company also paid Avaya $345.0 million in the Company's Class A Common Stock, predominantly for future fees, which was capitalized and will be amortized over the expected benefit period. The transaction closed on October 31, 2019. The investment in preferred securities in which the Company does not have a controlling interest or significant influence are measured at fair value with changes recorded through other income (expense) in the Condensed Consolidated Statement of Operations. The advance payment represents prepayment for cost to obtain contracts with customers. The Company also purchased intellectual property rights, which have been capitalized as an intangible asset and will be amortized over the useful life of three years. In the fourth quarter of 2019, the Company also entered into a strategic partnership with Atos SE ("Atos") and its subsidiary, Unify Software and Solutions GmbH & CO. KG ("Unify"), which, among other things, provided for a one-time upfront consideration towards the acquisition of certain intellectual property rights and a commercial arrangement. Under the commercial agreement Unify is engaged in the marketing and sale of the Company's product, which represents advance payment for cost to obtain contracts with customers. In addition to the above transactions, the Company also separately entered into arrangements with unrelated third parties to acquire intellectual property rights during the fourth quarter of 2019. In connection with the above transactions, the Company recorded in aggregate $105.5 million in acquired intangible assets relating to developed technology on the Condensed Consolidated Balance Sheet, which will be amortized over their respective useful life of three In July 2020, the Company entered into a strategic partnership with Alcatel-Lucent Enterprise, a provider of communications, networking, and cloud solutions in Europe. The parties intend to introduce a new co-branded solution, which will be the exclusive Unified Communications as a Service ("UCaaS") solution marketed and sold by the strategic partner. Under the agreement, the Company paid an upfront consideration of $100.0 million in cash, which was included in deferred and prepaid sales commission costs on the Company's Condensed Consolidated Balance Sheets.

Convertible Senior Notes

Convertible Senior Notes	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Convertible Senior Notes	Convertible Senior Notes 2026 Convertible Senior Notes In September 2020, the Company issued $650 million aggregate principal amount of 0% convertible senior notes due 2026 in a private placement to qualified institutional buyers (the "2026 Notes"). The 2026 Notes are senior, unsecured obligations that do not bear regular interest, and the principal amount of the 2026 Notes does not accrete. The 2026 Notes may bear special interest under specified circumstances relating to the Company's failure to comply with its reporting obligations under the indenture governing the 2026 Notes (the "2026 Indenture") or if the 2026 Notes are not freely tradeable as required by the 2026 Indenture. The 2026 Notes will mature on March 15, 2026, unless earlier repurchased or redeemed by the Company or converted pursuant to their terms. The total net proceeds from the debt offering, after deducting initial purchase discounts and debt issuance costs, were approximately $640.2 million. Each $1,000 principal amount of the 2026 Notes is initially convertible into 2.3583 shares of the Company’s Class A common stock par value $0.0001 (“Class A Common Stock”), which is equivalent to an initial conversion price of approximately $424.03 per share. The conversion rate is subject to adjustment upon the occurrence of certain specified events but will not be adjusted for any accrued and unpaid special interest. In addition, upon the occurrence of a make-whole fundamental change or a redemption period, each as defined in the 2026 Indenture, the Company will, in certain circumstances, increase the conversion rate by a number of additional shares for a holder that elects to convert its 2026 Notes in connection with such make-whole fundamental change or during the relevant redemption period. Prior to the close of business on the business day immediately preceding December 15, 2025, the 2026 Notes will be convertible only under the following circumstances: (1) during any calendar quarter commencing after December 31, 2020, and only during such calendar quarter, if the last reported sale price of the Class A Common Stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; (2) during the five-business day period after any five consecutive trading day period in which, for each trading day of that period, the trading price per $1,000 principal amount of 2026 Notes for such trading day was less than 98% of the product of the last reported sale price of the Class A Common Stock and the conversion rate for the 2026 Notes on each such trading day; (3) upon the Company’s notice that it is redeeming any or all of the 2026 Notes, at any time prior to the close of business on the scheduled trading day immediately preceding the redemption date; or (4) upon the occurrence of specified corporate events. On or after December 15, 2025, until the close of business on the scheduled trading day immediately preceding the maturity date, holders of the 2026 Notes may convert all or a portion of their 2026 Notes regardless of the foregoing conditions. Upon conversion, the Company will pay or deliver, as the case may be, either cash, shares of Class A Common Stock or a combination of cash and shares of Class A Common Stock, at the Company’s election. It is the Company’s current intent to settle the principal amount of the 2026 Notes with cash. During the three months ended September 30, 2020, the conditions allowing holders of the 2026 Notes to convert were not met. The Company may redeem the 2026 Notes, at its option, on or after March 20, 2023, at a redemption price equal to 100% of the principal amount thereof, plus accrued and unpaid special interest if the last reported sale price of the Company’s Class A Common Stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which the Company provides written notice of redemption. No sinking fund is provided for the 2026 Notes. Upon the occurrence of a fundamental change (as defined in the 2026 Indenture) prior to the maturity date, holders may require the Company to repurchase all or a portion of the 2026 Notes for cash at a price equal to 100% of the principal amount of the 2026 Notes to be repurchased, plus any accrued and unpaid special interest to, but excluding, the fundamental change repurchase date. The 2026 Notes are senior unsecured obligations and will rank senior in right of payment to any of the Company’s indebtedness that is expressly subordinated in right of payment to the 2026 Notes; equal in right of payment with the Company’s existing and future liabilities that are not so subordinated, including the 2023 Notes and the 2025 Notes; effectively junior in right of payment to any of the Company’s secured indebtedness to the extent of the value of the assets securing such indebtedness; and structurally junior to all indebtedness and other liabilities (including trade payables) of current or future subsidiaries of the Company. In accounting for the issuance of the 2026 Notes, the Company separated the 2026 Notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the fair value of a similar debt instrument that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was $138.9 million and was determined by deducting the fair value of the liability component from the par value of the 2026 Notes. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. The excess of the principal amount of the liability component over its carrying amount (“debt discount”) is amortized to interest expense at an effective interest rate over the contractual terms of the 2026 Notes. In accounting for the transaction costs related to the 2026 Notes, the Company allocated the total amount incurred to the liability and equity components of the 2026 Notes based on the proportion of the proceeds allocated to the debt and equity components. Issuance costs attributable to the liability component recorded as additional debt discount were $7.7 million and will be amortized to interest expense using the effective interest method over the contractual terms of the 2026 Notes. Issuance costs attributable to the equity component of $2.1 million were netted with the equity component in stockholders’ equity. The net carrying amount of the liability component of the 2026 Notes was as follows (in thousands): September 30, 2020 Principal $ 650,000 Unamortized discount (137,991) Unamortized issuance cost (7,627) Net carrying amount $ 504,382 The net carrying amount of the equity component of the 2026 Notes was as follows (in thousands): September 30, 2020 Proceeds allocated to the conversion option (debt discount) $ 138,923 Issuance cost (2,085) Net carrying amount $ 136,838 The following table sets forth the interest expense recognized related to the 2026 Notes (in thousands): Three Months Ended September 30, 2020 Amortization of debt discount $ 932 Amortization of debt issuance costs 43 Total interest expense related to the 2026 Notes $ 975 2026 Capped Calls In connection with the offering of the 2026 Notes, the Company entered into privately-negotiated capped call transactions with certain counterparties (the “2026 Capped Calls”). The 2026 Capped Calls each have an initial strike price of approximately $424.03 per share, subject to certain adjustments, which corresponds to the initial conversion price of the 2026 Notes. The 2026 Capped Calls have initial cap prices of approximately $556.10 per share, subject to certain adjustments. The 2026 Capped Calls cover, subject to anti-dilution adjustments, approximately 1.5 million shares of Class A Common Stock. The 2026 Capped Calls are generally intended to reduce or offset the potential dilution to the Class A Common Stock upon any conversion of the 2026 Notes with such reduction or offset, as the case may be, subject to a cap based on the cap price. The 2026 Capped Calls settle in components commencing on February 13, 2025 with the last component scheduled to expire on March 13, 2025. The 2026 Capped Calls are subject to either adjustment or termination upon the occurrence of specified extraordinary events affecting the Company, including a merger event; a tender offer; and a nationalization, insolvency or delisting involving the Company. In addition, the 2026 Capped Calls are subject to certain specified additional disruption events that may give rise to a termination of the 2026 Capped Calls, including changes in law; insolvency filings; and hedging disruptions. The 2026 Capped Call transactions are recorded in stockholders’ equity and are not accounted for as derivatives. The net cost of $41.8 million incurred to purchase the Capped Call transactions was recorded as a reduction to additional paid-in capital on the Company's Condensed Consolidated Balance Sheets. 2025 Convertible Senior Notes In March 2020, the Company issued $1.0 billion aggregate principal amount of 0% convertible senior notes due 2025 in a private placement to qualified institutional buyers (the "2025 Notes"). The 2025 Notes are senior, unsecured obligations that do not bear regular interest, and the principal amount of the 2025 Notes does not accrete. The 2025 Notes may bear special interest under specified circumstances relating to the Company's failure to comply with its reporting obligations under the indenture governing the 2025 Notes (the "2025 Indenture") or if the 2025 Notes are not freely tradeable as required by the 2025 Indenture. The 2025 Notes will mature on March 1, 2025, unless earlier repurchased or redeemed by the Company or converted pursuant to their terms. The total net proceeds from the debt offering, after deducting initial purchase discounts and debt issuance costs, were approximately $986.5 million. Each $1,000 principal amount of the 2025 Notes is initially convertible into 2.7745 shares of Class A Common Stock, which is equivalent to an initial conversion price of approximately $360.43 per share. The conversion rate is subject to adjustment upon the occurrence of certain specified events but will not be adjusted for any accrued and unpaid special interest. In addition, upon the occurrence of a make-whole fundamental change or a redemption period, each as defined in the 2025 Indenture, the Company will, in certain circumstances, increase the conversion rate by a number of additional shares for a holder that elects to convert its 2025 Notes in connection with such make-whole fundamental change or during the relevant redemption period. Prior to the close of business on the business day immediately preceding December 1, 2024, the 2025 Notes will be convertible only under the following circumstances: (1) during any calendar quarter commencing after June 30, 2020, and only during such calendar quarter, if the last reported sale price of the Class A Common Stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; (2) during the five-business day period after any five consecutive trading day period in which, for each trading day of that period, the trading price per $1,000 principal amount of 2025 Notes for such trading day was less than 98% of the product of the last reported sale price of the Class A Common Stock and the conversion rate for the 2025 Notes on each such trading day; (3) upon the Company’s notice that it is redeeming any or all of the 2025 Notes, but only with respect to the 2025 Notes called for redemption, at any time prior to the close of business on the scheduled trading day immediately preceding the redemption date; or (4) upon the occurrence of specified corporate events. On or after December 1, 2024, until the close of business on the scheduled trading day immediately preceding the maturity date, holders of the 2025 Notes may convert all or a portion of their 2025 Notes regardless of the foregoing conditions. Upon conversion, the Company will pay or deliver, as the case may be, either cash, shares of Class A Common Stock or a combination of cash and shares of Class A Common Stock, at the Company’s election. It is the Company’s current intent to settle the principal amount of the 2025 Notes with cash. During the three months ended September 30, 2020, the conditions allowing holders of the 2025 Notes to convert were not met. The Company may redeem the 2025 Notes, at its option, on or after March 5, 2022, at a redemption price equal to 100% of the principal amount thereof, plus accrued and unpaid special interest if the last reported sale price of the Company’s Class A Common Stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive), including the trading day immediately preceding the date on which the Company provides notice of redemption, during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which the Company provides written notice of redemption. No sinking fund is provided for the 2025 Notes. Upon the occurrence of a fundamental change (as defined in the 2025 Indenture) prior to the maturity date, holders may require the Company to repurchase all or a portion of the 2025 Notes for cash at a price equal to 100% of the principal amount of the 2025 Notes to be repurchased, plus any accrued and unpaid special interest to, but excluding, the fundamental change repurchase date. The 2025 Notes are senior unsecured obligations and will rank senior in right of payment to any of the Company’s indebtedness that is expressly subordinated in right of payment to the 2025 Notes; equal in right of payment with the Company’s existing and future liabilities that are not so subordinated, including the 2023 Notes; effectively junior in right of payment to any of the Company’s secured indebtedness to the extent of the value of the assets securing such indebtedness; and structurally junior to all indebtedness and other liabilities (including trade payables) of current or future subsidiaries of the Company. In accounting for the issuance of the 2025 Notes, the Company separated the 2025 Notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the fair value of a similar debt instrument that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was $195.1 million and was determined by deducting the fair value of the liability component from the par value of the 2025 Notes. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. The excess of the principal amount of the liability component over its carrying amount (“debt discount”) is amortized to interest expense at an effective interest rate over the contractual terms of the 2025 Notes. In accounting for the transaction costs related to the 2025 Notes, the Company allocated the total amount incurred to the liability and equity components of the 2025 Notes based on the proportion of the proceeds allocated to the debt and equity components. Issuance costs attributable to the liability component recorded as additional debt discount were $10.9 million and will be amortized to interest expense using the effective interest method over the contractual terms of the 2025 Notes. Issuance costs attributable to the equity component of $2.6 million were netted with the equity component in stockholders’ equity. The net carrying amount of the liability component of the 2025 Notes was as follows (in thousands): September 30, 2020 Principal $ 1,000,000 Unamortized discount (174,624) Unamortized issuance cost (9,856) Net carrying amount $ 815,520 The net carrying amount of the equity component of the 2025 Notes was as follows (in thousands): September 30, 2020 Proceeds allocated to the conversion option (debt discount) $ 195,074 Issuance cost (2,632) Net carrying amount $ 192,442 The following table sets forth the interest expense recognized related to the 2025 Notes (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2020 2020 Amortization of debt discount $ 8,912 20,451 Amortization of debt issuance costs 442 1,004 Total interest expense related to the 2025 Notes $ 9,354 $ 21,455 2025 Capped Calls In connection with the offering of the 2025 Notes, the Company entered into privately-negotiated capped call transactions with certain counterparties (the “2025 Capped Calls”). The 2025 Capped Calls each have an initial strike price of approximately $360.43 per share, subject to certain adjustments, which corresponds to the initial conversion price of the 2025 Notes. The 2025 Capped Calls have initial cap prices of approximately $480.56 per share, subject to certain adjustments. The 2025 Capped Calls cover, subject to anti-dilution adjustments, approximately 2.8 million shares of Class A Common Stock. The 2025 Capped Calls are generally intended to reduce or offset the potential dilution to the Class A Common Stock upon any conversion of the 2025 Notes with such reduction or offset, as the case may be, subject to a cap based on the cap price. The 2025 Capped Calls settle in components commencing on January 31, 2024 with the last component scheduled to expire on February 28, 2024. The 2025 Capped Calls are subject to either adjustment or termination upon the occurrence of specified extraordinary events affecting the Company, including a merger event; a tender offer; and a nationalization, insolvency or delisting involving the Company. In addition, the 2025 Capped Calls are subject to certain specified additional disruption events that may give rise to a termination of the 2025 Capped Calls, including changes in law; insolvency filings; and hedging disruptions. The Capped Call transactions are recorded in stockholders’ equity and are not accounted for as derivatives. The net cost of $60.9 million incurred to purchase the Capped Call transactions was recorded as a reduction to additional paid-in capital on the Company's Condensed Consolidated Balance Sheets. 2023 Convertible Senior Notes In March 2018, the Company issued $460.0 million aggregate principal amount of 0% convertible senior notes due 2023 in a private placement, including the exercise in full of the over-allotment options of the initial purchasers (the "2023 Notes"). The 2023 Notes are senior unsecured obligations of the Company, do not bear regular interest, and the principal amount of the 2023 Notes does not accrete. The 2023 Notes may bear special interest under specified circumstances as outlined in the indenture governing the 2023 Notes (the “2023 Indenture”) or if the 2023 Notes are not freely tradeable as required by the 2023 Indenture. The 2023 Notes will mature on March 15, 2023, unless earlier repurchased or redeemed by the Company or converted pursuant to their terms. The total net proceeds from the debt offering, after deducting initial purchase discounts and debt issuance costs, were approximately $449.5 million. Each $1,000 principal amount of the 2023 Notes is initially convertible into 12.2782 shares of the Company’s Class A Common Stock, which is equivalent to an initial conversion price of approximately $81.45 per share. The conversion rate is subject to adjustment upon the occurrence of certain specified events but will not be adjusted for any accrued and unpaid special interest. In addition, upon the occurrence of a make-whole fundamental change or a redemption period, each as defined in the 2023 Indenture, the Company will, in certain circumstances, increase the conversion rate by a number of additional shares for a holder that elects to convert its 2023 Notes in connection with such make-whole fundamental change or during the relevant redemption period. The 2023 Notes will be convertible at certain times and upon the occurrence of certain events in the future. Further, on or after December 15, 2022, until the close of business on the scheduled trading day immediately preceding the maturity date, holders of the 2023 Notes may convert all or a portion of their 2023 Notes regardless of these conditions. Upon conversion, the Company will pay or deliver, as the case may be, cash, shares of Class A Common Stock, or a combination of cash and shares of Class A Common Stock, at the Company’s election. It is the Company’s current intent to settle the principal amount of the 2023 Notes with cash. In March 2020, the Company used $509.6 million of the net proceeds from the offering of the 2025 Notes to repurchase $172.5 million aggregate principal amount of the 2023 Notes in cash through individual privately negotiated transactions (the “First Partial Repurchase of 2023 Notes”). Of the $509.6 million net proceeds, $153.7 million and $355.9 million were allocated to the debt and equity components, respectively, utilizing an effective interest rate to determine the fair value of the liability component. This interest rate reflected the Company’s incremental borrowing rate, adjusted for the Company’s credit standing on nonconvertible debt with similar maturity. As of the repurchase date, the carrying value of the 2023 Notes subject to the First Partial Repurchase of 2023 Notes, net of unamortized debt discount and issuance costs, was $146.4 million. The First Partial Repurchase of 2023 Notes resulted in a $7.3 million loss on early debt extinguishment. In September 2020, the Company used $452.6 million of the net proceeds from the offering of the 2026 Notes to repurchase $132.6 million aggregate principal amount of the 2023 Notes in cash through individual privately negotiated transactions (the “Second Partial Repurchase of 2023 Notes”). Of the $452.6 million net proceeds, $121.1 million and $331.5 million were allocated to the debt and equity components, respectively, utilizing an effective interest rate to determine the fair value of the liability component. This interest rate reflected the Company’s incremental borrowing rate, adjusted for the Company’s credit standing on nonconvertible debt with similar maturity. As of the repurchase date, the carrying value of the 2023 Notes subject to the Second Partial Repurchase of 2023 Notes, net of unamortized debt discount and issuance costs, was $115.6 million. The Second Partial Repurchase of 2023 Notes resulted in a $5.5 million loss on early debt extinguishment. During the three months ended September 30, 2020, the stock price condition allowing holders of the 2023 Notes to convert was met. As a result, holders have the option to convert their 2023 Notes at any time during the fiscal quarter ending December 31, 2020. The 2023 Notes may be convertible thereafter if one or more of the conversion conditions specified in the 2023 Indenture is satisfied during future measurement periods. During the three months ended September 30, 2020, the Company settled approximately $51.2 million principal amount of unsettled requests received as of June 30, 2020, and received additional conversion requests on the principal amount of the 2023 Notes totaling approximately $16.1 million, out of which an immaterial amount was settled during the quarter ended September 30, 2020. During the quarter ended September 30, 2020, the Company recognized an immaterial gain on these conversions representing the net carrying amount in excess of the fair value of the liability component of the converted notes on the respective settlement dates. During the nine months ended September 30, 2020, the Company settled approximately $53.1 million principal amount and recognized an immaterial gain on these conversions. The amount is included in other income (expense), net in the Condensed Consolidated Statement of Operations. In relation to the remaining $16.1 million principal amount of unsettled conversion requests, as of September 30, 2020, the Company reclassified the net carrying value of the debt of $14.2 million from long-term to short-term debt and a portion of equity of approximately $1.9 million representing the difference between the principal and net carrying amount of the liability component of the 2023 Notes requested for conversion, into temporary equity, as these requests will be settled during the fourth quarter of fiscal 2020. In addition, from October 1, 2020 to the date of this filing, the Company has received additional conversion requests for $5.5 million principal amounts, which are expected to be settled during the quarter ending December 31, 2020. The Company may redeem the 2023 Notes, at its option, on or after September 20, 2020, at a redemption price equal to 100% of the principal amount thereof, plus accrued and unpaid special interest to, but excluding the redemption date, subject to certain conditions. No sinking fund is provided for the 2023 Notes. Upon the occurrence of a fundamental change (as defined in the 2023 Indenture) prior to the maturity date, holders may require the Company to repurchase all or a portion of the 2023 Notes for cash at a price equal to 100% of the principal amount of the 2023 Notes to be repurchased, plus any accrued and unpaid special interest to, but excluding, the fundamental change repurchase date. The net carrying amount of the liability component of the 2023 Notes was as follows (in thousands): September 30, 2020 Principal $ 101,787 Unamortized discount (11,620) Unamortized issuance cost (1,015) Net carrying amount (1) $ 89,152 (1) As of September 30, 2020, $14.2 million net carrying amount of the liability component was classified as a current liability on the Condensed Consolidated Balance Sheets. The following table sets forth the interest expense recognized related to the 2023 Notes (in thousands): Three Months Ended Nine Months Ended 2020 2019 2020 2019 Amortization of debt discount $ 2,097 $ 4,759 $ 9,445 $ 14,102 Amortization of debt issuance costs 169 359 745 1,047 Total interest expense related to the 2023 Notes $ 2,266 $ 5,118 $ 10,190 $ 15,149 2023 Capped Calls

Leases

Leases	9 Months Ended
	Sep. 30, 2020
Leases [Abstract]
Leases	Leases The Company primarily leases facilities for office and datacenter space under non-cancelable operating leases for its U.S. and international locations. As of September 30, 2020, non-cancellable leases expire on various dates between 2020 and 2029. The components of leases are as follows (in thousands): Operating leases September 30, 2020 December 31, 2019 Operating lease right-of-use assets $ 50,414 $ 39,269 Accrued liabilities $ 16,407 $ 14,249 Operating lease liabilities 37,973 28,516 Total operating lease liabilities $ 54,380 $ 42,765 Nine Months Ended September 30, Supplemental Cash Flow Information 2020 2019 Operating cash flows resulting from operating leases: Cash paid for amounts included in the measurement of lease liabilities $ 12,713 $ 11,680 New ROU assets obtained in exchange of lease liabilities: Operating leases $ 22,509 $ 17,388 On August 6, 2020, the Company entered into a second amendment to its headquarters lease agreement (the “Lease Amendment”). The premises leased occupy approximately 84,148 rentable square feet of office building space, consisting of three office floors, located at 20 Davis Drive in Belmont, California. The Lease Amendment extends the Company’s right to occupy the premises commencing on August 1, 2021 and terminates on July 31, 2026, unless earlier terminated pursuant to the terms of the Lease Amendment. The Company has the right to extend the term for one additional five-year period under certain circumstances. The monthly base rent for the first year of the extended lease term is approximately $0.3 million and increases annually thereafter by three percent for the balance of the extended term.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Matters The Company is subject to certain legal proceedings described below, and from time to time may be involved in a variety of claims, lawsuits, investigations, and proceedings relating to contractual disputes, intellectual property rights, employment matters, regulatory compliance matters, and other litigation matters relating to various claims that arise in the normal course of business. The Company determines whether an estimated loss from a contingency should be accrued by assessing whether a loss is deemed probable and can be reasonably estimated. The Company assesses its potential liability by analyzing specific litigation and regulatory matters using reasonably available information. The Company develops its views on estimated losses in consultation with inside and outside counsel, which involves a subjective analysis of potential results and outcomes, assuming various combinations of appropriate litigation and settlement strategies. Actual claims could settle or be adjudicated against the Company in the future for materially different amounts than the Company has accrued due to the inherently unpredictable nature of litigation. Legal fees are expensed in the period in which they are incurred. TCPA Matter On November 17, 2017, Joann Hurley (“Hurley”), filed a second amended complaint in an ongoing putative class action lawsuit pending in the United States District Court for the Southern District of West Virginia, adding the Company as a named defendant and alleging that the Company and other defendants violated the Telephone Consumer Protection Act (“TCPA”) and regulations promulgated thereunder by allegedly using an automated telephone dialing system to deliver prerecorded political messages to Hurley, an incumbent running for reelection, and others. Hurley alternatively alleged that the Company was vicariously liable for the actions of the other co-defendants. Hurley seeks statutory, compensatory, consequential, incidental and punitive damages, costs, and attorneys’ fees in connection with her claims. The Company was served with the second amended complaint on January 4, 2018. On March 23, 2018, the Company filed a motion to dismiss the complaint for lack of standing and failure to sufficiently state a claim on which relief may be granted. Hurley filed her opposition brief on April 6, 2018, and the Company filed its reply brief on April 13, 2018. On October 4, 2018, the district court issued its memorandum and opinion order granting in part and denying in part the Company’s motion to dismiss. The district court dismissed Hurley’s vicarious liability claim but allowed Hurley’s TCPA claim to proceed. The Company filed its answer and affirmative defenses to the second amended complaint on October 18, 2018. Hurley filed a motion to certify a class on July 9, 2019. The Company and another defendant filed oppositions to the motion, which have been fully briefed and is pending decision by the court. Discovery closed on October 25, 2019. The Company filed a motion for summary judgment on November 14, 2019. Hurley opposed the motion, which has been fully briefed and is pending decision by the court. The parties mediated the case before a private mediator on January 23, 2020, at which time a tentative settlement was achieved. The settlement will need to be approved by the court. Meanwhile, the court has issued an order holding the case in abeyance pending approval of the settlement. The condensed consolidated financial statements include an immaterial accrual for the estimated loss that is expected to occur. Patent Infringement Matter On April 25, 2017, Uniloc USA, Inc. and Uniloc Luxembourg, S.A. (together, “Uniloc”) filed in the U.S. District Court for the Eastern District of Texas two actions against the Company alleging infringement of U.S. Patent Nos. 7,804,948; 7,853,000; and 8,571,194 by RingCentral’s Glip unified communications application. The plaintiffs seek a declaration that the Company has infringed the patents, damages according to proof, injunctive relief, as well as their costs, attorney’s fees, expenses and interest. On October 9, 2017, the Company filed a motion to dismiss or transfer requesting that the case be transferred to the United States District Court for the Northern District of California. In response to the motion, plaintiffs filed a first amended complaint on October 24, 2017. The Company filed a renewed motion to dismiss or transfer on November 15, 2017. Although briefing on that motion has been completed, the motion has not yet been decided. On February 5, 2018, Uniloc moved to stay the litigation pending the resolution of certain third-party inter partes review proceedings (“IPRs”) before the United States Patent and Trademark Office. On February 9, 2018, the court stayed the litigation pending resolution of the IPRs without prejudice to or waiver of the Company’s motion to dismiss or transfer. This litigation is still in its earliest stages. Based on the information known by the Company as of the date of this filing and the rules and regulations applicable to the preparation of the Company’s condensed consolidated financial statements, it is not possible to provide an estimated amount of any such loss or range of loss that may occur. The Company intends to vigorously defend against this lawsuit. CIPA Matter On June 16, 2020, Plaintiff Meena Reuben (“Reuben”) filed a complaint against the Company for a putative class action lawsuit in California Superior Court for San Mateo County. The complaint alleges claims on behalf of a class of individuals for whom, while they were in California, the Company allegedly intercepted and recorded communications between individuals and the Company’s customers without the individual’s consent, in violation of the California Invasion of Privacy Act (“CIPA”) Sections 631 and 632.7. Reuben seeks statutory damages of $5,000 for each alleged violation of Sections 631 and 632.7, injunctive relief, and attorneys’ fees and costs, and other unspecified amount of damages. On July 7, 2020, the Court granted the parties’ stipulation to extend time for the Company to respond to the Reuben’s complaint. The Company has not responded to the complaint. This litigation is still in its earliest stages. Based on the information known by the Company as of the date of this filing and the rules and regulations applicable to the preparation of the Company’s condensed consolidated financial statements, it is not possible to provide an estimated amount of any such loss or range of loss that may occur. The Company intends to vigorously defend against this lawsuit. Other Matter On June 14, 2019, the Company filed suit in the Superior Court of California, County of Alameda against Bright Pattern, Inc. and two of its officers, alleging that the defendants negotiated a potential acquisition of Bright Pattern by RingCentral fraudulently and in bad faith. The Company seeks its costs incurred in negotiating under the Letter of Intent ("LOI") that the parties entered into and damages for lost opportunity as a result of forgoing another acquisition opportunity,

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Stockholders' Equity	Stockholders’ Equity In connection with the Company’s initial public offering, the Company reincorporated in Delaware on September 26, 2013. The Delaware certificate of incorporation provides for two classes of common stock: Class A and Class B common stock, both with a par value of $0.0001 per share. In addition, the certificate of incorporation authorizes shares of undesignated preferred stock with a par value of $0.0001 per share. The terms of preferred stock are described below. Preferred Stock The board of directors may, without further action by the stockholders, fix the rights, preferences, privileges and restrictions of up to an aggregate of 100,000,000 shares of preferred stock in one or more series and authorizes their issuance. These rights, preferences, and privileges could include dividend rights, conversion rights, voting rights, terms of redemption, liquidation preferences, sinking fund terms and the number of shares constituting any series or the designation of such series, any or all of which may be greater than the rights of the Class A and Class B common stock. As of September 30, 2020 and December 31, 2019, there were 100,000,000 shares of preferred stock authorized and no shares issued or outstanding. Class A and Class B Common Stock The Company has authorized 1,000,000,000 and 250,000,000 shares of Class A common stock and Class B common stock for issuance. Holders of Class A common stock and Class B common stock have identical rights for matters submitted to a vote of the Company’s stockholders. Holders of Class A common stock are entitled to one vote per share of Class A common stock and holders of Class B common stock are entitled to 10 votes per share of Class B common stock. Holders of shares of Class A common stock and Class B common stock vote together as a single class on all matters (including the election of directors) except for specific circumstances that would adversely affect the powers, preferences, or rights of a particular class of common stock. Subject to preferences that may apply to any shares of preferred stock outstanding at the time, holders of Class A and Class B common stock share equally, identically and ratably, on a per share basis, with respect to any dividend or distribution of cash, property or shares of the Company’s capital stock. Holders of Class A and Class B common stock also share equally, identically, and ratably in all assets remaining after the payment of any liabilities and liquidation preferences and any accrued or declared but unpaid dividends, if any, with respect to any outstanding preferred stock at the time. Each share of Class B common stock is convertible at any time at the option of the holder into one share of Class A common stock. In addition, each share of Class B common stock will convert automatically to Class A common stock upon: (i) the date specified by an affirmative vote or written consent of holders of at least 67% of the outstanding shares of Class B common stock, or (ii) the date on which the number of outstanding shares of Class B common stock represents less than 10% of the aggregate combined number of outstanding shares of Class A common stock and Class B common stock, or (iii) any time seven years after the Company's initial public offering (October 2, 2020), when a stockholder owns less than 50% of the shares of Class B common stock that such holder owned immediately prior to completion of the initial public offering.

Share-Based Compensation

Share-Based Compensation	9 Months Ended
	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Share-Based Compensation	Share-Based Compensation A summary of share-based compensation expense recognized in the Company’s Condensed Consolidated Statements of Operations is as follows (in thousands): Three Months Ended Nine Months Ended 2020 2019 2020 2019 Cost of revenues $ 3,847 $ 2,351 $ 10,419 $ 6,112 Research and development 10,679 6,230 27,918 16,000 Sales and marketing 17,552 10,182 45,165 27,589 General and administrative 19,488 8,613 53,908 21,989 Total share-based compensation expense $ 51,566 $ 27,376 $ 137,410 $ 71,690 A summary of share-based compensation expense by award type is as follows (in thousands): Three Months Ended Nine Months Ended 2020 2019 2020 2019 Options $ 8 $ 137 $ 41 $ 876 Employee stock purchase plan rights 1,719 868 4,954 2,810 Restricted stock units 49,839 26,371 132,415 68,004 Total share-based compensation expense $ 51,566 $ 27,376 $ 137,410 $ 71,690 Equity Incentive Plans As of September 30, 2020, a total of 17,605,478 shares remained available for grant under the RingCentral, Inc. Amended and Restated 2013 Equity Incentive Plan (“2013 Plan”). A summary of option activity under all of the Company’s equity incentive plans at September 30, 2020 and changes during the period then ended is presented in the following table: Number of Weighted- Weighted- Aggregate Outstanding at December 31, 2019 2,257 $ 13.13 2.5 $ 351,428 Granted — — Exercised (956) 13.36 Canceled/Forfeited — — Outstanding at September 30, 2020 1,301 $ 12.96 1.8 $ 340,420 Vested and expected to vest as of September 30, 2020 1,301 $ 12.96 1.8 $ 340,416 Exercisable as of September 30, 2020 1,300 $ 12.96 1.8 $ 340,264 There were no options granted during the three and nine months ended September 30, 2020 and 2019. The total intrinsic value of options exercised during the three months ended September 30, 2020 and 2019 were $43.9 million and $57.3 million, respectively, and $219.7 million and $137.6 million, during the nine months ended September 30, 2020 and 2019, respectively. As of September 30, 2020, there was an immaterial amount of unrecognized share-based compensation expense, net of estimated forfeitures, related to non-vested stock option grants, which will be recognized on a straight-line basis over the remaining weighted-average vesting period of approximately 0.3 years. Employee Stock Purchase Plan The Company's Employee Stock Purchase Plan (“ESPP”) allows eligible employees to purchase shares of the Company’s Class A Common Stock at a discounted price through payroll deductions. As of September 30, 2020, there was a total of $1.0 million of unrecognized share-based compensation expense, net of estimated forfeitures, related to the ESPP, which will be recognized on a straight-line basis over the remaining weighted-average vesting period of approximately 0.1 years. As of September 30, 2020, a total of 4,713,290 shares were available for issuance under the ESPP. Restricted Stock Units The 2013 Plan provides for the issuance of restricted stock units (“RSUs”) to employees, directors, and consultants. RSUs issued under the 2013 Plan generally vest over four years. A summary of activity of RSUs under the 2013 Plan at September 30, 2020, and changes during the period then ended is presented in the following table: Number of Weighted- Aggregate Outstanding at December 31, 2019 3,249 $ 85.39 $ 548,145 Granted 1,253 217.88 Released (1,397) 95.97 Canceled/Forfeited (198) 107.71 Outstanding at September 30, 2020 2,907 $ 135.88 $ 798,357 As of September 30, 2020, there was a total of $278.9 million of unrecognized share-based compensation expense, net of estimated forfeitures, related to RSUs, which will be recognized on a straight-line basis over the remaining weighted-average vesting period of approximately 2.3 years. Bonus Plan In December 2018, the Company's board of directors (the "Board") adopted the Selective 2019 Key Employee Equity Bonus Plan (the "2019 KEEB Plan”), which became effective on January 1, 2019, and in December 2019, the Board adopted the Selective 2020 Key Employee Equity Bonus Plan (the "2020 KEEB Plan" and together with the 2019 KEEB Plan the "KEEB Plans"), which became effective on January 1, 2020. Both KEEB Plans allow the recipients to earn fully vested shares of the Company’s Class A Common Stock upon the achievement of quarterly service and performance conditions. During the three and nine months ended September 30, 2020, the Company issued 22,685 and 71,541 RSUs, respectively, under the KEEB Plans. The total requisite service period of each quarterly award is approximately 0.4 years. The unrecognized share-based compensation expense was approximately $2.1 million, which will be recognized over the remaining service period of 0.1 years. The shares issued under the KEEB Plans will be issued from the reserve of shares available for issuance under the 2013 Plan.

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting The Company has determined that the chief executive officer is the chief operating decision maker. The Company’s chief executive officer reviews financial information presented on a consolidated basis for purposes of assessing performance and making decisions on how to allocate resources. Accordingly, the Company has determined that it operates in a single reportable segment. Concentrations At September 30, 2020 and December 31, 2019, none of the Company’s customers accounted for more than 10% of the Company’s total accounts receivable.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The provision for (benefit from) income taxes for the three months ended September 30, 2020 and 2019, was $0.4 million and $(0.1) million, respectively, and was $0.8 million and $(3.1) million for the nine months ended September 30, 2020 and 2019, respectively. The provision for (benefit from) income taxes for the three and nine months ended September 30, 2020 and 2019 consisted primarily of state minimum taxes and foreign income taxes. The provision for (benefit from) income taxes for the nine months ended September 30, 2019 also included a one-time benefit from the release of valuation allowance as a result of the ConnectFirst acquisition. For the three and nine months ended September 30, 2020 and 2019, the provision for income taxes differed from the U.S. federal statutory rate primarily due to state and foreign taxes currently payable. Due to the Connect First acquisition in January 2019, a deferred tax liability was established for the book-tax basis difference related to identifiable acquired intangibles. The net deferred tax liability from acquisitions is considered an additional source of income to support the realizability of the Company's pre-existing deferred tax asset, and as a result the Company released a portion of the valuation allowance that was established in the previous year and recorded a one-time tax benefit of $3.2 million for the nine months ended September 30, 2019. The Company realized no benefit for the current year losses due to a full valuation allowance against the U.S. and foreign net deferred tax assets. The realization of tax benefits of net deferred tax assets is dependent upon future levels of taxable income, of an appropriate character, in the periods the items are expected to be deductible or taxable. Based on the available objective evidence, the Company does not believe it is more likely than not that the net deferred tax assets will be realizable. Accordingly, the Company has provided a full valuation allowance against the entire domestic and the majority of the foreign net deferred tax assets as of September 30, 2020 and December 31, 2019. The Company intends to maintain the full valuation allowance on the U.S. net deferred tax assets until sufficient positive evidence exists to support a reversal of, or decrease in, the valuation allowance. During the three and nine months ended September 30, 2020, there were no material changes to the total amount of unrecognized tax benefits. On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act ("CARES Act") was passed into law and amended portions of relevant tax laws. The CARES Act did not have any significant impact on the provision for income taxes for the three and nine months ended September 30, 2020. The Company will continue to monitor future guidance issued regarding the CARES Act.

Basic and Diluted Net Loss Per

Basic and Diluted Net Loss Per Share	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Basic and Diluted Net Loss Per Share	Basic and Diluted Net Loss Per ShareBasic net loss per share is computed by dividing the net loss by the weighted-average number of shares of common stock outstanding during the period. Diluted net loss per share is computed by giving effect to all potential shares of common stock, stock options, restricted stock units, ESPP, and convertible senior notes, to the extent dilutive. For the three and nine months ended September 30, 2020 and 2019, all such common stock equivalents have been excluded from diluted net loss per share as the effect to net loss per share would be anti-dilutive. The following table sets forth the computation of the Company’s basic and diluted net loss per share of common stock (in thousands, except per share data): Three Months Ended Nine Months Ended 2020 2019 2020 2019 Numerator Net loss $ (20,957) $ (12,749) $ (81,169) $ (28,350) Denominator: Weighted-average common shares outstanding for basic and diluted net loss per share 89,173 83,283 88,259 82,348 Basic and diluted net loss per share $ (0.24) $ (0.15) $ (0.92) $ (0.34) The following table summarizes the potentially dilutive common shares that were excluded from diluted weighted-average common shares outstanding because including them would have had an anti-dilutive effect (in thousands): Three Months Ended Nine Months Ended 2020 2019 2020 2019 Shares of common stock issuable under equity incentive awards outstanding 4,590 6,677 5,000 7,146 Shares of common stock related to convertible senior notes 1,378 2,139 1,963 1,587 Potential common shares excluded from diluted net loss per share 5,968 8,816 6,963 8,733 Since the Company expects to settle the principal amount on its outstanding 2023, 2025, and 2026 Notes in cash and any excess in cash or shares of the Company’s Class A Common Stock, the Company uses the treasury stock method for calculating any potential dilutive effect of the conversion spread on diluted net income per share, if applicable. The conversion spread will have a dilutive impact on diluted net income per share of common stock when the average market price of the Company’s Class A Common Stock for a given period exceeds the conversion price of $81.45, $360.43, and $424.03 per share for the 2023, 2025, and 2026 Notes, respectively. The denominator for diluted net income per share does not include any effect from the capped call transactions the Company entered into concurrently with the issuance of the 2023, 2025, and 2026 Notes as this effect would be anti-dilutive. In the event of conversion of a 2023, 2025, or 2026 Note, if shares are delivered to the Company under the capped call, they will offset the dilutive effect of the shares that the Company would issue under the Notes.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2020
Related Party Transactions [Abstract]
Related Party Transactions	Related Party TransactionsIn the ordinary course of business, the Company made purchases from Google Inc., at which one of the Company’s directors serves as President, Americas. Total payables to Google Inc. at September 30, 2020 and December 31, 2019 were $2.3 million and $1.5 million, respectively. Total expenses incurred from Google Inc. were $5.7 million and $4.7 million in the three months ended September 30, 2020 and 2019, respectively, and $18.2 million and $14.0 million in the nine months ended September 30, 2020 and 2019, respectively.

Description of Business and S_2

Description of Business and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation The Company's unaudited condensed consolidated financial statements and accompanying notes reflect all adjustments (all of which are normal, recurring in nature and those discussed in these notes) that are, in the opinion of management, necessary for a fair presentation of the interim periods presented. All intercompany balances and transactions have been eliminated in consolidation. The results of operations for the interim periods presented are not necessarily indicative of the results to be expected for any subsequent quarter or for the entire year ending December 31, 2020. Certain information and note disclosures normally included in annual consolidated financial statements prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) have been condensed or omitted under the rules and regulations of the Securities and Exchange Commission (“SEC”). The unaudited condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019, filed with the SEC on February 26, 2020.
Use of Estimates	Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements, and the reported amounts of revenues and expenses during the reporting period. The significant estimates made by management affect revenues, the allowance for doubtful accounts, valuation of long-term investments, deferred sales commission costs, goodwill, useful lives of intangible assets, share-based compensation, capitalization of internally developed software, liability and equity allocation of convertible senior notes, return reserves, provision for income taxes, uncertain tax positions, loss contingencies, sales tax liabilities, and accrued liabilities. Management periodically evaluates these estimates and will make adjustments prospectively based upon the results of such periodic evaluations. Actual results may differ from these estimates. In March 2020, the World Health Organization declared the outbreak of the novel strain of coronavirus (“COVID-19”) as a global pandemic with widespread and detrimental effect on the global economy. The extent of the impact of COVID-19 on the Company's operational and financial performance will depend on certain developments, including the duration and spread of the outbreak, impact on the Company's customers and sales cycles, and its employees, all of which are uncertain and cannot be predicted. As of the date of issuance of these financial statements, the Company is not aware of any specific event or circumstance that would require updating significant estimates or judgments or revising the carrying value of the Company's assets or liabilities as presented in the unaudited interim condensed consolidated financial statements. These estimates may change as new events occur and additional information is obtained. Actual results could differ materially from these estimates.
Recent Accounting Pronouncements Not Yet Adopted	Recent Accounting Pronouncements Not Yet Adopted In December 2019, the Financial Accounting Standard Board ("FASB") issued Accounting Standard Update ("ASU") No. 2019-12, Accounting Standards Update (Topic 740): Simplifying the Accounting for Income Taxes. The ASU removes certain exceptions for recognizing deferred taxes for investments, performing intraperiod allocation and calculating income taxes in interim periods. The ASU also adds guidance to reduce complexity in certain areas, including recognizing deferred taxes for goodwill and allocating taxes to members of a consolidated group. The ASU is effective for calendar year-end public entities on January 1, 2021. Entities may early adopt the ASU in any interim period for which financial statements have not yet been issued (or made available for issuance). The Company has not yet adopted the new guidance. The adoption is not expected to have a material impact on the Company's condensed consolidated financial statements. In March 2020, the FASB issued optional guidance for a limited time to ease the potential burden in accounting for or recognizing the effects of reference rate reform, particularly, the risk of cessation of the London Interbank Offered Rate ("LIBOR") on financial reporting. The guidance provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The amendments are elective and are effective upon issuance for all entities through December 31, 2022. The Company is currently evaluating the impact of the new guidance. In August 2020, the FASB issued ASU No. 2020-06, Accounting for Convertible Instruments and Contracts in an Entity's Own Equity , which simplifies the accounting for certain convertible instruments, amends the guidance on derivative scope exceptions for contracts in an entity's own equity, and modifies the guidance on diluted earnings per share calculations as a result of these changes. This new standard is effective for public entities for fiscal years beginning after December 15, 2021, and interim periods within those fiscal years. The amendment is to be adopted through either a fully retrospective or modified retrospective method of transition. Early adoption is permitted. The Company is currently evaluating the impact of the new guidance on its condensed consolidated financial statements.

Revenue and Cost of Revenue (Ta

Revenue and Cost of Revenue (Tables)	9 Months Ended
	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following table provides information about disaggregated revenue by primary geographical markets: Three Months Ended Nine Months Ended 2020 2019 2020 2019 Primary geographical markets North America 92 % 94 % 92 % 94 % Others 8 6 8 6 Total revenues 100 % 100 % 100 % 100 %

Financial Statement Components

Financial Statement Components (Tables)	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Components of Cash and Cash Equivalents	Cash and cash equivalents consisted of the following (in thousands): September 30, 2020 December 31, 2019 Cash $ 102,431 $ 46,295 Money market funds 643,127 297,311 Total cash and cash equivalents $ 745,558 $ 343,606
Components of Accounts Receivable, Net	Accounts receivable, net consisted of the following (in thousands): September 30, 2020 December 31, 2019 Accounts receivable $ 133,363 $ 114,745 Unbilled accounts receivable 25,433 17,603 Allowance for doubtful accounts (5,213) (2,358) Accounts receivable, net $ 153,583 $ 129,990
Components of Prepaid Expenses and Other Current Assets	Prepaid expenses and other current assets consisted of the following (in thousands): September 30, 2020 December 31, 2019 Prepaid expenses $ 19,759 $ 16,249 Inventory 673 401 Other current assets 19,819 8,704 Total prepaid expenses and other current assets $ 40,251 $ 25,354
Components of Property and Equipment, Net	Property and equipment, net consisted of the following (in thousands): September 30, 2020 December 31, 2019 Computer hardware and software $ 159,970 $ 120,841 Internal-use software development costs 79,277 48,419 Furniture and fixtures 8,131 7,690 Leasehold improvements 12,662 11,327 Total property and equipment, gross 260,040 188,277 Less: accumulated depreciation and amortization (127,073) (99,047) Property and equipment, net $ 132,967 $ 89,230
Schedule of Goodwill	The carrying value of goodwill is as follows (in thousands): Balance at December 31, 2019 $ 55,278 Foreign currency translation adjustments 945 Balance at September 30, 2020 $ 56,223
Summary of Carrying Values of Intangible Assets	The carrying values of intangible assets are as follows (in thousands): September 30, 2020 December 31, 2019 Estimated Lives Cost Accumulated Acquired Cost Accumulated Acquired Customer relationships 2 to 5 years $ 21,636 $ 11,138 $ 10,498 $ 21,245 $ 8,178 $ 13,067 Developed technology 3 to 5 years 123,681 32,285 91,396 123,547 9,276 114,271 Total acquired intangible assets $ 145,317 $ 43,423 $ 101,894 $ 144,792 $ 17,454 $ 127,338
Summary of Estimated Amortization Expense for Acquired Intangible Assets	Estimated amortization expense for acquired intangible assets for the following fiscal years is as follows (in thousands): 2020 (remaining) $ 8,532 2021 34,128 2022 28,522 2023 16,542 2024 onwards 14,170 Total estimated amortization expense $ 101,894
Components of Accrued Liabilities	Accrued liabilities consisted of the following (in thousands): September 30, 2020 December 31, 2019 Accrued compensation and benefits $ 37,890 $ 30,541 Accrued sales, use, and telecom related taxes 28,354 25,757 Accrued marketing 29,485 17,505 Operating lease liabilities, short-term 16,407 14,249 Other accrued expenses 77,419 50,677 Total accrued liabilities $ 189,555 $ 138,729

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Financial Assets Carried at Fair Value	The financial assets carried at fair value were determined using the following inputs (in thousands): Fair Value at September 30, 2020 Level 1 Level 2 Level 3 Cash equivalents: Money market funds $ 643,127 $ 643,127 $ — $ — Noncurrent assets: Long-term investments $ 173,641 $ — $ — $ 173,641 Fair Value at December 31, 2019 Level 1 Level 2 Level 3 Cash equivalents: Money market funds $ 297,311 $ 297,311 $ — $ — Noncurrent assets: Long-term investments $ 132,188 $ — $ — $ 132,188

Business Combinations, Strate_2

Business Combinations, Strategic Partnerships, and Asset Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2020
Business Combinations [Abstract]
Schedule of Allocation of the Purchase Price of the Assets Acquired and Liabilities Assumed	The allocation of the purchase price of the assets acquired and liabilities assumed based on their estimated fair values was as follows (in thousands): Cash and cash equivalents $ 1,427 Other tangible assets acquired 2,266 Acquired intangible assets 13,300 Goodwill 24,465 Total assets acquired 41,458 Liabilities assumed (5,013) Total consideration $ 36,445

Convertible Senior Notes (Table

Convertible Senior Notes (Tables)	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Summary of Net Carrying Amount of Liability Component and Equity Component of Notes	The net carrying amount of the liability component of the 2026 Notes was as follows (in thousands): September 30, 2020 Principal $ 650,000 Unamortized discount (137,991) Unamortized issuance cost (7,627) Net carrying amount $ 504,382 The net carrying amount of the liability component of the 2025 Notes was as follows (in thousands): September 30, 2020 Principal $ 1,000,000 Unamortized discount (174,624) Unamortized issuance cost (9,856) Net carrying amount $ 815,520 The net carrying amount of the liability component of the 2023 Notes was as follows (in thousands): September 30, 2020 Principal $ 101,787 Unamortized discount (11,620) Unamortized issuance cost (1,015) Net carrying amount (1) $ 89,152 (1) As of September 30, 2020, $14.2 million net carrying amount of the liability component was classified as a current liability on the Condensed Consolidated Balance Sheets.
Schedule of Equity Component of Convertible Debt	The net carrying amount of the equity component of the 2026 Notes was as follows (in thousands): September 30, 2020 Proceeds allocated to the conversion option (debt discount) $ 138,923 Issuance cost (2,085) Net carrying amount $ 136,838 The net carrying amount of the equity component of the 2025 Notes was as follows (in thousands): September 30, 2020 Proceeds allocated to the conversion option (debt discount) $ 195,074 Issuance cost (2,632) Net carrying amount $ 192,442
Schedule of Interest Expense Recognized Related to Notes	The following table sets forth the interest expense recognized related to the 2026 Notes (in thousands): Three Months Ended September 30, 2020 Amortization of debt discount $ 932 Amortization of debt issuance costs 43 Total interest expense related to the 2026 Notes $ 975 The following table sets forth the interest expense recognized related to the 2025 Notes (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2020 2020 Amortization of debt discount $ 8,912 20,451 Amortization of debt issuance costs 442 1,004 Total interest expense related to the 2025 Notes $ 9,354 $ 21,455 The following table sets forth the interest expense recognized related to the 2023 Notes (in thousands): Three Months Ended Nine Months Ended 2020 2019 2020 2019 Amortization of debt discount $ 2,097 $ 4,759 $ 9,445 $ 14,102 Amortization of debt issuance costs 169 359 745 1,047 Total interest expense related to the 2023 Notes $ 2,266 $ 5,118 $ 10,190 $ 15,149

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2020
Leases [Abstract]
Components of Leases	The components of leases are as follows (in thousands): Operating leases September 30, 2020 December 31, 2019 Operating lease right-of-use assets $ 50,414 $ 39,269 Accrued liabilities $ 16,407 $ 14,249 Operating lease liabilities 37,973 28,516 Total operating lease liabilities $ 54,380 $ 42,765
Lease Cost	Nine Months Ended September 30, Supplemental Cash Flow Information 2020 2019 Operating cash flows resulting from operating leases: Cash paid for amounts included in the measurement of lease liabilities $ 12,713 $ 11,680 New ROU assets obtained in exchange of lease liabilities: Operating leases $ 22,509 $ 17,388

Share-Based Compensation (Table

Share-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Summary of Share-Based Compensation Expense Recognized to Statements of Operations	A summary of share-based compensation expense recognized in the Company’s Condensed Consolidated Statements of Operations is as follows (in thousands): Three Months Ended Nine Months Ended 2020 2019 2020 2019 Cost of revenues $ 3,847 $ 2,351 $ 10,419 $ 6,112 Research and development 10,679 6,230 27,918 16,000 Sales and marketing 17,552 10,182 45,165 27,589 General and administrative 19,488 8,613 53,908 21,989 Total share-based compensation expense $ 51,566 $ 27,376 $ 137,410 $ 71,690
Summary of Share-Based Compensation Expense by Award Type	A summary of share-based compensation expense by award type is as follows (in thousands): Three Months Ended Nine Months Ended 2020 2019 2020 2019 Options $ 8 $ 137 $ 41 $ 876 Employee stock purchase plan rights 1,719 868 4,954 2,810 Restricted stock units 49,839 26,371 132,415 68,004 Total share-based compensation expense $ 51,566 $ 27,376 $ 137,410 $ 71,690
Summary of Stock Option Activity Plans	A summary of option activity under all of the Company’s equity incentive plans at September 30, 2020 and changes during the period then ended is presented in the following table: Number of Weighted- Weighted- Aggregate Outstanding at December 31, 2019 2,257 $ 13.13 2.5 $ 351,428 Granted — — Exercised (956) 13.36 Canceled/Forfeited — — Outstanding at September 30, 2020 1,301 $ 12.96 1.8 $ 340,420 Vested and expected to vest as of September 30, 2020 1,301 $ 12.96 1.8 $ 340,416 Exercisable as of September 30, 2020 1,300 $ 12.96 1.8 $ 340,264
Summary of RSUs Activity	A summary of activity of RSUs under the 2013 Plan at September 30, 2020, and changes during the period then ended is presented in the following table: Number of Weighted- Aggregate Outstanding at December 31, 2019 3,249 $ 85.39 $ 548,145 Granted 1,253 217.88 Released (1,397) 95.97 Canceled/Forfeited (198) 107.71 Outstanding at September 30, 2020 2,907 $ 135.88 $ 798,357

Basic and Diluted Net Loss Pe_2

Basic and Diluted Net Loss Per Share (Tables)	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Computation of Company's Basic and Diluted Net (Loss) Income Per Share of Common Stock	The following table sets forth the computation of the Company’s basic and diluted net loss per share of common stock (in thousands, except per share data): Three Months Ended Nine Months Ended 2020 2019 2020 2019 Numerator Net loss $ (20,957) $ (12,749) $ (81,169) $ (28,350) Denominator: Weighted-average common shares outstanding for basic and diluted net loss per share 89,173 83,283 88,259 82,348 Basic and diluted net loss per share $ (0.24) $ (0.15) $ (0.92) $ (0.34)
Potential Shares of Common Stock Excluded from Diluted Weighted-Average Common Shares Outstanding	The following table summarizes the potentially dilutive common shares that were excluded from diluted weighted-average common shares outstanding because including them would have had an anti-dilutive effect (in thousands): Three Months Ended Nine Months Ended 2020 2019 2020 2019 Shares of common stock issuable under equity incentive awards outstanding 4,590 6,677 5,000 7,146 Shares of common stock related to convertible senior notes 1,378 2,139 1,963 1,587 Potential common shares excluded from diluted net loss per share 5,968 8,816 6,963 8,733

Revenue and Cost of Revenue - A

Revenue and Cost of Revenue - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Percentage of revenue (as a percent)	100.00%	100.00%	100.00%	100.00%
Percentage of subscriptions (as a percent)	90.00%	90.00%	90.00%	90.00%
Revenue recognized	$ 14,500		$ 102,500
Revenue, remaining performance obligation, amount	1,200,000		1,200,000
Product revenues	303,624	$ 233,352	849,121	$ 649,993
Product cost of revenues	82,314	59,705	232,395	164,170
Product
Disaggregation of Revenue [Line Items]
Product revenues	11,300	11,500	31,500	30,100
Product cost of revenues	$ 10,200	$ 10,400	$ 29,800	$ 27,400
Minimum
Disaggregation of Revenue [Line Items]
Remaining performance obligations subscription term			1 month
Maximum
Disaggregation of Revenue [Line Items]
Remaining performance obligations subscription term			5 years
North America
Disaggregation of Revenue [Line Items]
Percentage of revenue (as a percent)	92.00%	94.00%	92.00%	94.00%
Others
Disaggregation of Revenue [Line Items]
Percentage of revenue (as a percent)	8.00%	6.00%	8.00%	6.00%

Revenue and Cost of Revenue - P

Revenue and Cost of Revenue - Performance Obligation, Timing of Satisfaction (Details)	Sep. 30, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation, percentage	54.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation, percentage	46.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period

Financial Statement Component_2

Financial Statement Components - Components of Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash	$ 102,431	$ 46,295
Money market funds	643,127	297,311
Total cash and cash equivalents	$ 745,558	$ 343,606

Financial Statement Component_3

Financial Statement Components - Components of Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts receivable	$ 133,363	$ 114,745
Unbilled accounts receivable	25,433	17,603
Allowance for doubtful accounts	(5,213)	(2,358)
Accounts receivable, net	$ 153,583	$ 129,990

Financial Statement Component_4

Financial Statement Components - Components of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Prepaid expenses	$ 19,759	$ 16,249
Inventory	673	401
Other current assets	19,819	8,704
Total prepaid expenses and other current assets	$ 40,251	$ 25,354

Financial Statement Component_5

Financial Statement Components - Components of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 260,040	$ 188,277
Less: accumulated depreciation and amortization	(127,073)	(99,047)
Property and equipment, net	132,967	89,230
Computer hardware and software
Property, Plant and Equipment [Line Items]
Total property and equipment	159,970	120,841
Internal-use software development costs
Property, Plant and Equipment [Line Items]
Total property and equipment	79,277	48,419
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	8,131	7,690
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 12,662	$ 11,327

Financial Statement Component_6

Financial Statement Components - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Depreciation and amortization	$ 10,500,000	$ 7,300,000	$ 27,800,000	$ 19,600,000
Property, equipment and software licenses financed through vendor financing arrangement			4,700,000
Amortization expense of Intangible Assets	8,600,000	2,300,000	25,800,000	6,500,000
Amortization of deferred and prepaid sales commission costs	12,400,000	8,000,000	33,060,000	21,189,000
Impairment loss in relation to costs capitalized	$ 0	$ 0	$ 0	$ 0
Developed technology
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization periods			3 years 1 month 6 days
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization periods			2 years 2 months 12 days
Q2 2020 Property and Equipment Finance Agreement
Finite-Lived Intangible Assets [Line Items]
Debt instrument, interest rate (percentage)	3.95%		3.95%
Arrangement term			3 years
Q2 2020 Property and Equipment Finance Agreement, Hardware and Software
Finite-Lived Intangible Assets [Line Items]
Amount of equipment collateralized	$ 3,200,000		$ 3,200,000

Financial Statement Component_7

Financial Statement Components - Components of Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 55,278
Foreign currency translation adjustments	945
Goodwill, ending balance	$ 56,223

Financial Statement Component_8

Financial Statement Components - Summary of Carrying Values of Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Cost	$ 145,317	$ 144,792
Accumulated Amortization	43,423	17,454
Total estimated amortization expense	101,894	127,338
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Cost	21,636	21,245
Accumulated Amortization	11,138	8,178
Total estimated amortization expense	$ 10,498	13,067
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated Lives	2 years
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Lives	5 years
Developed technology
Finite-Lived Intangible Assets [Line Items]
Cost	$ 123,681	123,547
Accumulated Amortization	32,285	9,276
Total estimated amortization expense	$ 91,396	$ 114,271
Developed technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated Lives	3 years
Developed technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Lives	5 years

Financial Statement Component_9

Financial Statement Components - Summary of Estimated Amortization Expense for Acquired Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
2020 (remaining)	$ 8,532
2021	34,128
2022	28,522
2023	16,542
2024 onwards	14,170
Total estimated amortization expense	$ 101,894	$ 127,338

Financial Statement Componen_10

Financial Statement Components - Components of Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued compensation and benefits	$ 37,890	$ 30,541
Accrued sales, use, and telecom related taxes	28,354	25,757
Accrued marketing	29,485	17,505
Operating lease liabilities, short-term	16,407	14,249
Other accrued expenses	77,419	50,677
Total accrued liabilities	$ 189,555	$ 138,729

Fair Value of Financial Instr_3

Fair Value of Financial Instruments - Financial Assets Carried at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Noncurrent assets:
Long-term investments	$ 173,641	$ 132,188
Level 1
Noncurrent assets:
Long-term investments	0	0
Level 2
Noncurrent assets:
Long-term investments	0	0
Level 3
Noncurrent assets:
Long-term investments	173,641	132,188
Money market funds
Cash equivalents:
Money market funds	643,127	297,311
Money market funds | Level 1
Cash equivalents:
Money market funds	643,127	297,311
Money market funds | Level 2
Cash equivalents:
Money market funds	0	0
Money market funds | Level 3
Cash equivalents:
Money market funds	$ 0	$ 0

Fair Value of Financial Instr_4

Fair Value of Financial Instruments - Additional Information (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term investments in convertible and redeemable preferred stock	$ 173,641,000	$ 173,641,000		$ 132,188,000
Unrealized gain	23,300,000	38,600,000
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term investments in convertible and redeemable preferred stock	0	0		$ 0
Convertible senior notes due 2026 | Convertible Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal	$ 650,000,000	$ 650,000,000
Debt instrument, interest rate (percentage)	0.00%	0.00%
Convertible senior notes due 2026 | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, interest rate (percentage)	0.00%	0.00%
Fair value of convertible senior notes	$ 644,600,000	$ 644,600,000
Convertible senior notes due 2025 | Convertible Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal	$ 1,000,000,000	$ 1,000,000,000	$ 1,000,000,000
Debt instrument, interest rate (percentage)			0.00%
Convertible senior notes due 2025 | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, interest rate (percentage)	0.00%	0.00%
Fair value of convertible senior notes	$ 1,100,000,000	$ 1,100,000,000
Convertible senior notes due 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal	$ 101,787,000	$ 101,787,000
Debt instrument, interest rate (percentage)					0.00%
Convertible senior notes due 2023 | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, interest rate (percentage)	0.00%	0.00%
Fair value of convertible senior notes	$ 341,900,000	$ 341,900,000

Business Combinations, Strate_3

Business Combinations, Strategic Partnerships, and Asset Acquisitions - Narrative (Details)	Jan. 14, 2019USD ($)	Jul. 31, 2020USD ($)	Oct. 31, 2019USD ($)$ / shares	Dec. 31, 2019USD ($)	Sep. 30, 2020USD ($)
Business Acquisition [Line Items]
Goodwill				$ 55,278,000	$ 56,223,000
Long-term investments				132,188,000	$ 173,641,000
Acquired intangible assets				105,500,000
Deferred sales commissions, noncurrent				$ 371,100,000
Strategic partnership agreement, fee		$ 100,000,000
Minimum
Business Acquisition [Line Items]
Weighted average amortization periods			3 years
Maximum
Business Acquisition [Line Items]
Weighted average amortization periods			5 years
Avaya
Business Acquisition [Line Items]
Long-term investments			$ 125,000,000
Preferred stock, initial conversion price (in dollars per share) | $ / shares			$ 16
Percentage interests acquired in Avaya upon conversion (percentage)			6.00%
Consideration to be transferred			$ 345,000,000
Avaya | Avaya
Business Acquisition [Line Items]
Preferred stock, dividend rate (percentage)			0.03
Connect First, Inc.
Business Acquisition [Line Items]
Total purchase consideration	$ 36,400,000
Cash payments	29,300,000
Contingent consideration	$ 7,100,000
Estimated lives	3 years
Goodwill	$ 24,465,000
Amount of goodwill expected to be tax deductible	0
Connect First, Inc. | Restricted stock units
Business Acquisition [Line Items]
Consideration, restricted stock unit	$ 4,000,000
Consideration, restricted stock unit, vesting period	4 years

Business Combinations, Strate_4

Business Combinations, Strategic Partnerships, and Asset Acquisitions - Preliminary Purchase Price Allocation (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Jan. 14, 2019
Business Acquisition [Line Items]
Goodwill	$ 56,223	$ 55,278
Connect First, Inc.
Business Acquisition [Line Items]
Cash and cash equivalents			$ 1,427
Other tangible assets acquired			2,266
Acquired intangible assets			13,300
Goodwill			24,465
Total assets acquired			41,458
Liabilities assumed			(5,013)
Total consideration			$ 36,445

Convertible Senior Notes - Narr

Convertible Senior Notes - Narrative (Details)	1 Months Ended				3 Months Ended			9 Months Ended
	Nov. 09, 2020USD ($)	Sep. 30, 2020USD ($)d$ / sharesshares	Mar. 31, 2020USD ($)d$ / sharesshares	Mar. 31, 2018USD ($)$ / sharesshares	Sep. 30, 2020USD ($)$ / shares	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)$ / shares	Sep. 30, 2020USD ($)d$ / shares	Sep. 30, 2019USD ($)
Debt Instrument [Line Items]
Proceeds from issuance debt, net of discounts and issuance costs								$ 1,627,209,000	$ 0
Net cost incurred in connection with transaction								102,695,000	0
Loss on early extinguishment of debt								$ 12,323,000	$ 0
Temporary equity reclassification					$ 372,227,000	$ 4,051,000	$ 355,932,000
Class A common stock
Debt Instrument [Line Items]
Stock par value (in dollars per share) | $ / shares		$ 0.0001			$ 0.0001			$ 0.0001
Convertible Debt | Period One
Debt Instrument [Line Items]
Convertible debt threshold trading days | d		20						20
Convertible debt, threshold consecutive trading days | d		30						30
Convertible debt, threshold percentage of stock price trigger (percent)		130.00%						130.00%
Convertible Debt | Period Two
Debt Instrument [Line Items]
Convertible debt, threshold consecutive trading days | d		5						5
Convertible debt, threshold percentage of principal amount trigger (percent)		98.00%						98.00%
Convertible Debt | Period Three
Debt Instrument [Line Items]
Convertible debt threshold trading days | d			20
Convertible debt, threshold consecutive trading days | d		30	30
Convertible debt, threshold percentage of stock price trigger (percent)		130.00%	130.00%
Convertible senior notes due 2026
Debt Instrument [Line Items]
Proceeds from issuance debt, net of discounts and issuance costs		$ 452,600,000
Conversion price per share (in dollars per share) | $ / shares		$ 424.03			$ 424.03			$ 424.03
Proceeds allocated to the conversion option (debt discount)		$ 138,923,000			$ 138,923,000			$ 138,923,000
Issuance costs allocable to equity component		$ 2,085,000			$ 2,085,000			$ 2,085,000
Convertible senior notes due 2026 | Capped call
Debt Instrument [Line Items]
Conversion price per share (in dollars per share) | $ / shares		$ 556.10			$ 556.10			$ 556.10
Initial strike price (in dollars per share) | $ / shares		$ 424.03
Net cost incurred in connection with transaction		$ 41,800,000
Convertible senior notes due 2026 | Class A common stock
Debt Instrument [Line Items]
Debt conversion, converted instrument, shares issued (in shares)		0.0023583
Convertible senior notes due 2026 | Class A common stock | Capped call
Debt Instrument [Line Items]
Option indexed to issuer's equity (in shares) | shares		1,500,000
Convertible senior notes due 2026 | Convertible Debt
Debt Instrument [Line Items]
Principal		$ 650,000,000			$ 650,000,000			$ 650,000,000
Debt instrument, interest rate (percentage)		0.00%			0.00%			0.00%
Proceeds from issuance debt, net of discounts and issuance costs		$ 640,200,000
Proceeds allocated to the conversion option (debt discount)		138,900,000			$ 138,900,000			$ 138,900,000
Debt issuance costs		7,700,000			7,700,000			7,700,000
Issuance costs allocable to equity component		$ 2,100,000			$ 2,100,000			$ 2,100,000
Convertible senior notes due 2026 | Convertible Debt | Period Two
Debt Instrument [Line Items]
Convertible debt threshold trading days | d		5
Convertible senior notes due 2026 | Convertible Debt | Period Three
Debt Instrument [Line Items]
Debt redemption price (percentage)		100.00%
Convertible senior notes due 2026 | Convertible Debt | Class A common stock
Debt Instrument [Line Items]
Conversion price per share (in dollars per share) | $ / shares		$ 424.03			$ 424.03			$ 424.03
Convertible senior notes due 2025
Debt Instrument [Line Items]
Proceeds from issuance debt, net of discounts and issuance costs			$ 509,600,000
Conversion price per share (in dollars per share) | $ / shares		$ 360.43			$ 360.43			$ 360.43
Proceeds allocated to the conversion option (debt discount)		$ 195,074,000			$ 195,074,000			$ 195,074,000
Issuance costs allocable to equity component		2,632,000			2,632,000			2,632,000
Convertible senior notes due 2025 | Capped call
Debt Instrument [Line Items]
Conversion price per share (in dollars per share) | $ / shares			$ 480.56				$ 480.56
Initial strike price (in dollars per share) | $ / shares			$ 360.43
Net cost incurred in connection with transaction			$ 60,900,000
Convertible senior notes due 2025 | Class A common stock
Debt Instrument [Line Items]
Debt conversion, converted instrument, shares issued (in shares)			0.0027745
Convertible senior notes due 2025 | Class A common stock | Capped call
Debt Instrument [Line Items]
Option indexed to issuer's equity (in shares) | shares			2,800,000
Convertible senior notes due 2025 | Convertible Debt
Debt Instrument [Line Items]
Principal		1,000,000,000	$ 1,000,000,000		1,000,000,000		$ 1,000,000,000	$ 1,000,000,000
Debt instrument, interest rate (percentage)			0.00%				0.00%
Proceeds from issuance debt, net of discounts and issuance costs			$ 986,500,000
Proceeds allocated to the conversion option (debt discount)			195,100,000				$ 195,100,000
Debt issuance costs			10,900,000				10,900,000
Issuance costs allocable to equity component			$ 2,600,000				$ 2,600,000
Convertible senior notes due 2025 | Convertible Debt | Period Two
Debt Instrument [Line Items]
Convertible debt threshold trading days | d								5
Convertible senior notes due 2025 | Convertible Debt | Period Three
Debt Instrument [Line Items]
Debt redemption price (percentage)			100.00%
Convertible senior notes due 2025 | Convertible Debt | Class A common stock
Debt Instrument [Line Items]
Conversion price per share (in dollars per share) | $ / shares			$ 360.43				$ 360.43
Convertible senior notes due 2023
Debt Instrument [Line Items]
Principal		$ 101,787,000			$ 101,787,000			$ 101,787,000
Debt instrument, interest rate (percentage)				0.00%
Proceeds from issuance debt, net of discounts and issuance costs				$ 449,500,000
Conversion price per share (in dollars per share) | $ / shares		$ 81.45			$ 81.45			$ 81.45
Proceeds allocated to the conversion option (debt discount)		$ 331,500,000	$ 355,900,000		$ 331,500,000		$ 355,900,000	$ 331,500,000
Debt instrument, repurchased face amount		132,600,000	172,500,000		132,600,000		172,500,000	132,600,000
Convertible debt, liability component		121,100,000	153,700,000		121,100,000		153,700,000	121,100,000
Long-term debt		115,600,000	146,400,000		115,600,000		$ 146,400,000	115,600,000
Loss on early extinguishment of debt		$ 5,500,000	$ 7,300,000
Principal converted amount					51,200,000			$ 53,100,000
Convertible debt, principal amount to be converted					16,100,000
Temporary equity reclassification					$ 1,900,000
Convertible senior notes due 2023 | Subsequent Event
Debt Instrument [Line Items]
Convertible debt, principal amount to be converted	$ 5,500,000
Convertible senior notes due 2023 | Capped call
Debt Instrument [Line Items]
Conversion price per share (in dollars per share) | $ / shares				$ 119.035
Initial strike price (in dollars per share) | $ / shares				$ 81.45
Net cost incurred in connection with transaction				$ 49,900,000
Convertible senior notes due 2023 | Private Placement
Debt Instrument [Line Items]
Principal				$ 460,000,000
Convertible senior notes due 2023 | Scenario Three
Debt Instrument [Line Items]
Debt redemption price (percentage)				100.00%
Convertible senior notes due 2023 | Class A common stock
Debt Instrument [Line Items]
Debt conversion, converted instrument, shares issued (in shares)				0.0000122782
Conversion price per share (in dollars per share) | $ / shares		$ 81.45			$ 81.45			$ 81.45
Convertible senior notes due 2023 | Class A common stock | Capped call
Debt Instrument [Line Items]
Option indexed to issuer's equity (in shares) | shares				5,600,000

Convertible Senior Notes - Summ

Convertible Senior Notes - Summary of Net Carrying Amount of Liability Component of 2025 and 2026 Convertible Notes (Details) - Convertible Debt - USD ($)	Sep. 30, 2020	Mar. 31, 2020
Convertible senior notes due 2026
Debt Instrument [Line Items]
Principal	$ 650,000,000
Unamortized discount	(137,991,000)
Unamortized issuance cost	(7,627,000)
Net carrying amount	504,382,000
Convertible senior notes due 2025
Debt Instrument [Line Items]
Principal	1,000,000,000	$ 1,000,000,000
Unamortized discount	(174,624,000)
Unamortized issuance cost	(9,856,000)
Net carrying amount	$ 815,520,000

Convertible Senior Notes - Su_2

Convertible Senior Notes - Summary of Net Carrying Amount of Equity Component of 2025 and 2026 Notes (Details) $ in Thousands	Sep. 30, 2020USD ($)
Shares related to convertible senior notes due 2026
Debt Instrument [Line Items]
Proceeds allocated to the conversion option (debt discount)	$ 138,923
Issuance cost	(2,085)
Net carrying amount	136,838
Shares related to convertible senior notes due 2025
Debt Instrument [Line Items]
Proceeds allocated to the conversion option (debt discount)	195,074
Issuance cost	(2,632)
Net carrying amount	$ 192,442

Convertible Senior Notes - Su_3

Convertible Senior Notes - Summary of Interest Expense Recognized Related to 2025 and 2026 Notes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Total interest expense related to the 2025 Notes	$ 12,680	$ 5,160	$ 32,780	$ 15,280
Convertible senior notes due 2026
Debt Instrument [Line Items]
Amortization of debt discount	932
Amortization of debt issuance costs	43
Total interest expense related to the 2025 Notes	975
Convertible senior notes due 2025
Debt Instrument [Line Items]
Amortization of debt discount	8,912		20,451
Amortization of debt issuance costs	442		1,004
Total interest expense related to the 2025 Notes	$ 9,354		$ 21,455

Convertible Senior Notes - Su_4

Convertible Senior Notes - Summary of Net Carrying Amount of Liability Component of 2023 Notes (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Current portion of convertible senior notes, net	$ 14,156,000	$ 0
Convertible senior notes due 2023
Debt Instrument [Line Items]
Principal	101,787,000
Unamortized discount	(11,620,000)
Unamortized issuance cost	(1,015,000)
Net carrying amount	89,152,000
Current portion of convertible senior notes, net	$ 14,200,000

Convertible Senior Notes - Sche

Convertible Senior Notes - Schedule of Interest Expense Recognized Related to 2023 Notes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Total interest expense related to the 2025 Notes	$ 12,680	$ 5,160	$ 32,780	$ 15,280
Shares of common stock related to convertible senior notes due 2023
Debt Instrument [Line Items]
Amortization of debt discount	2,097	4,759	9,445	14,102
Amortization of debt issuance costs	169	359	745	1,047
Total interest expense related to the 2025 Notes	$ 2,266	$ 5,118	$ 10,190	$ 15,149

Leases - Components of Leases a

Leases - Components of Leases and Lease Costs (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Operating leases
Operating lease right-of-use assets	$ 50,414	$ 39,269
Accrued liabilities	16,407	14,249
Operating lease liabilities	37,973	28,516
Total operating lease liabilities	$ 54,380	$ 42,765
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating cash flows resulting from operating leases:
Cash paid for amounts included in the measurement of lease liabilities	$ 12,713	$ 11,680
New ROU assets obtained in exchange of lease liabilities:
Operating leases	$ 22,509	$ 17,388

Leases - Narrative (Details)

Leases - Narrative (Details) $ in Millions	Aug. 06, 2020USD ($)ft²renewalofficeFloor
Leases [Abstract]
Office building, square feet | ft²	84,148
Number of office floors | officeFloor	3
Number of renewals | renewal	1
Renewal term	5 years
Annual base rent, first year | $	$ 0.3
Annual base rent increase (percent)	0.03

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) $ in Thousands	Aug. 26, 2019USD ($)defendent	Jun. 14, 2019defendent	Apr. 25, 2017action	Jun. 16, 2020USD ($)
Loss Contingencies [Line Items]
Number of actions filed against the Company | action			2
Damages sought per violation | $				$ 5
Cross complaint, number of defendants | defendent	2
RingCentral Suit Against Bright Pattern, Inc. And Officers
Loss Contingencies [Line Items]
Number of defendants | defendent		2
Bright Pattern, Inc. Cross Complaint Against RingCentral
Loss Contingencies [Line Items]
Break up fee | $	$ 5,000

Stockholders' Equity (Details)

Stockholders' Equity (Details)	9 Months Ended
	Sep. 30, 2020vote$ / sharesshares	Dec. 31, 2019shares	Sep. 30, 2019shares
Class of Stock [Line Items]
Preferred stock par value (in dollars per share) | $ / shares	$ 0.0001
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Preferred stock, shares issued (in shares)	0		0
Preferred stock, shares outstanding (in shares)	0
IPO Anniversary threshold	7 years
Class A common stock
Class of Stock [Line Items]
Stock par value (in dollars per share) | $ / shares	$ 0.0001
Common stock, shares authorized (in shares)	1,000,000,000
Common stock, number of votes per share | vote	1
Shares of Class A common stock issued upon conversion of Class B common stock (in shares)	1
Class B common stock
Class of Stock [Line Items]
Stock par value (in dollars per share) | $ / shares	$ 0.0001
Common stock, shares authorized (in shares)	250,000,000
Common stock, number of votes per share | vote	10
Percentage of written consent of shareholders (percent)	67.00%
Common stock, number of shares outstanding as a percentage of total shares outstanding (percent)	10.00%
Common stock, shares beneficially owned as a percentage of shares beneficially owned immediately prior to completion of the initial public offering (percent)	50.00%

Share-Based Compensation - Summ

Share-Based Compensation - Summary of Share-Based Compensation Expense Recognized to Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	$ 51,566	$ 27,376	$ 137,410	$ 71,690
Cost of revenues
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	3,847	2,351	10,419	6,112
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	10,679	6,230	27,918	16,000
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	17,552	10,182	45,165	27,589
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	$ 19,488	$ 8,613	$ 53,908	$ 21,989

Share-Based Compensation - Su_2

Share-Based Compensation - Summary of Share-Based Compensation Expense by Award Type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 51,566	$ 27,376	$ 137,410	$ 71,690
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	8	137	41	876
Employee stock purchase plan rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	1,719	868	4,954	2,810
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 49,839	$ 26,371	$ 132,415	$ 68,004

Share-Based Compensation - Narr

Share-Based Compensation - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted (in shares)	0	0	0	0
Intrinsic value of options exercised	$ 43.9	$ 57.3	$ 219.7	$ 137.6
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense, remaining weighted-average vesting periods			3 months 18 days
2013 Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Available for future grants (in shares)	4,713,290		4,713,290
Unrecognized share-based compensation expense, remaining weighted-average vesting periods			1 month 6 days
Unrecognized share-based compensation expense	$ 1		$ 1
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense, remaining weighted-average vesting periods			2 years 3 months 18 days
Vesting period contractual term			4 years
Unrecognized share-based compensation expense	$ 278.9		$ 278.9
2013 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Available for future grants (in shares)	17,605,478		17,605,478
Key Employee Equity Bonus Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense, remaining weighted-average vesting periods			1 month 6 days
Unrecognized share-based compensation expense	$ 2.1		$ 2.1
Number of shares issued (in shares)	22,685		71,541
Share based compensation requisite service period recognition	4 months 24 days

Share-Based Compensation - Su_3

Share-Based Compensation - Summary of Stock Option Activity Plans (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Number of Options Outstanding (in thousands)
Number of Options Outstanding, Beginning balance (in shares)			2,257,000
Number of Options Outstanding, Granted (in shares)	0	0	0	0
Number of Options Outstanding, Exercised (in shares)			(956,000)
Number of Options Outstanding, Canceled/Forfeited (in shares)			0
Number of Options Outstanding, Ending balance (in shares)	1,301,000		1,301,000		2,257,000
Number of Options Outstanding, Vested and expected to vest as of period end (in shares)	1,301,000		1,301,000
Number of Options Outstanding, Exercisable as of period end (in shares)	1,300,000		1,300,000
Weighted- Average Exercise Price Per Share
Weighted-Average Exercise Price, Beginning balance (in dollars per share)			$ 13.13
Weighted-Average Exercise Price, Granted (in dollars per share)			0
Weighted-Average Exercise Price, Exercised (in dollars per share)			13.36
Weighted-Average Exercise Price, Canceled/Forfeited (in dollars per share)			0
Weighted-Average Exercise Price, Ending balance (in dollars per share)	$ 12.96		12.96		$ 13.13
Weighted-Average Exercise Price, Outstanding (in dollars per share)	12.96		12.96
Weighted-Average Exercise Price, Exercisable (in dollars per share)	$ 12.96		$ 12.96
Weighted- Average Contractual Term (in Years)
Weighted-Average Contractual Term, Outstanding			1 year 9 months 18 days		2 years 6 months
Weighted-Average Contractual Term, Vested and expected to vest as of period end			1 year 9 months 18 days
Weighted-Average Contractual Term, Exercisable as of period end			1 year 9 months 18 days
Aggregate Intrinsic Value (in thousands)
Aggregate Intrinsic Value, Outstanding	$ 340,420		$ 340,420		$ 351,428
Aggregate Intrinsic Value, Vested and expected to vest as of period end	340,416		340,416
Aggregate Intrinsic Value, Exercisable as of period end	$ 340,264		$ 340,264

Share-Based Compensation - Su_4

Share-Based Compensation - Summary of RSUs Activity (Details) - Restricted stock units $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2020USD ($)$ / sharesshares
Number of RSUs Outstanding (in thousands)
Number of RSUs Outstanding, Beginning Balance (in shares) | shares	3,249
Number of RSUs Outstanding, Granted (in shares) | shares	1,253
Number of RSUs Outstanding, Released (in shares) | shares	(1,397)
Number of RSUs Outstanding, Canceled/Forfeited (in shares) | shares	(198)
Number of RSUs Outstanding, Ending Balance (in shares) | shares	2,907
Weighted- Average Grant Date Fair Value Per Share
Weighted-Average Grant Date Fair Value Per Share, Beginning Balance (in dollars per share) | $ / shares	$ 85.39
Weighted-Average Grant Date Fair Value Per Share, Granted (in dollars per share) | $ / shares	217.88
Weighted-Average Grant Date Fair Value Per Share, Released (in dollars per share) | $ / shares	95.97
Weighted-Average Grant Date Fair Value Per Share, Canceled/Forfeited (in dollars per share) | $ / shares	107.71
Weighted-Average Grant Date Fair Value Per Share, Ending Balance (in dollars per share) | $ / shares	$ 135.88
Aggregate Intrinsic Value (in thousands)
Aggregate Intrinsic Value, Beginning Balance (amount) | $	$ 548,145
Aggregate Intrinsic Value, Outstanding, Ending Balance (amount) | $	$ 798,357

Segment Reporting - Additional

Segment Reporting - Additional Information (Details) - segment	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Concentration Risk [Line Items]
Number of reporting segment	1
Minimum | U.S. | Long-lived Assets | Geographic Concentration Risk
Concentration Risk [Line Items]
Concentration risk (as a percentage)	89.00%	89.00%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Tax Credit Carryforward [Line Items]
Provision for (benefit from) income taxes	$ 431	$ (148)	$ 803	$ (3,118)
Connect First, Inc.
Tax Credit Carryforward [Line Items]
One time tax benefit from business acquisition				$ 3,200

Basic and Diluted Net Loss Pe_3

Basic and Diluted Net Loss Per Share - Computation of Company's Basic and Diluted Net (Loss) Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator
Net loss	$ (20,957)	$ 509	$ (60,721)	$ (12,749)	$ (9,243)	$ (6,358)	$ (81,169)	$ (28,350)
Denominator:
Weighted-average number of shares outstanding for basic and diluted net loss per share (in shares)	89,173			83,283			88,259	82,348
Basic and diluted net loss per share (in dollars per share)	$ (0.24)			$ (0.15)			$ (0.92)	$ (0.34)

Basic and Diluted Net Loss Pe_4

Basic and Diluted Net Loss Per Share - Potential Shares of Common Stock Excluded from Diluted Weighted-Average Common Shares Outstanding (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares excluded from diluted net loss per share (in shares)	5,968	8,816	6,963	8,733
Shares of common stock issuable under equity incentive awards outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares excluded from diluted net loss per share (in shares)	4,590	6,677	5,000	7,146
Shares of common stock related to convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares excluded from diluted net loss per share (in shares)	1,378	2,139	1,963	1,587

Basic and Diluted Net Loss Pe_5

Basic and Diluted Net Loss Per Share - Narrative (Details)	Sep. 30, 2020$ / shares
Shares of common stock related to convertible senior notes due 2023
Earnings Per Share [Line Items]
Conversion price per share (in dollars per share)	$ 81.45
Shares related to convertible senior notes due 2025
Earnings Per Share [Line Items]
Conversion price per share (in dollars per share)	360.43
Shares related to convertible senior notes due 2026
Earnings Per Share [Line Items]
Conversion price per share (in dollars per share)	$ 424.03

Related Party Transactions - Na

Related Party Transactions - Narrative (Details) - Google Inc. - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Related Party Transaction [Line Items]
Total payables to related party	$ 2.3		$ 2.3		$ 1.5
Total expenses incurred from related party	$ 5.7	$ 4.7	$ 18.2	$ 14