RingCentral (RNG) 10-Q 8 Aug 19 2019 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2019	Aug. 01, 2019
Document And Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
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	2019
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001384905
Current Fiscal Year End Date	--12-31
Class A common stock
Document And Entity Information [Line Items]
Entity Common Stock Outstanding (in shares)		71,760,269
Class B common stock
Document And Entity Information [Line Items]
Entity Common Stock Outstanding (in shares)		11,209,473

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 567,668	$ 566,329
Accounts receivable, net	105,585	94,375
Deferred sales commission costs	28,726	23,038
Prepaid expenses and other current assets	33,127	23,772
Total current assets	735,106	707,514
Property and equipment, net	78,549	70,205
Operating lease right-of-use-assets	34,341
Deferred sales commission costs, non-current	69,883	55,735
Goodwill	55,613	31,238
Acquired intangibles, net	28,514	19,480
Other assets	10,194	10,154
Total assets	1,012,200	894,326
Current liabilities
Accounts payable	21,161	10,145
Accrued liabilities	121,075	100,687
Deferred revenue	103,362	88,527
Total current liabilities	245,598	199,359
Convertible senior notes, net	376,583	366,552
Operating lease liabilities	24,911
Other long-term liabilities	9,541	10,806
Total liabilities	656,633	576,717
Commitments and contingencies (Note 9)
Stockholders' equity
Common stock	8	8
Additional paid-in capital	604,770	551,078
Accumulated other comprehensive income	2,093	2,226
Accumulated deficit	(251,304)	(235,703)
Total stockholders' equity	355,567	317,609
Total liabilities and stockholders' equity	$ 1,012,200	$ 894,326

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues
Total revenues	$ 215,152	$ 160,832	$ 416,641	$ 311,175
Cost of revenues
Total cost of revenues	53,630	38,066	104,465	73,740
Gross profit	161,522	122,766	312,176	237,435
Operating expenses
Research and development	32,632	24,814	62,419	47,465
Sales and marketing	103,590	79,023	203,141	150,943
General and administrative	32,480	23,583	61,259	45,032
Total operating expenses	168,702	127,420	326,819	243,440
Loss from operations	(7,180)	(4,654)	(14,643)	(6,005)
Other income (expense), net
Interest expense	(5,088)	(4,836)	(10,120)	(6,247)
Other income, net	3,141	1,338	6,192	1,411
Other income (expense), net	(1,947)	(3,498)	(3,928)	(4,836)
Loss before income taxes	(9,127)	(8,152)	(18,571)	(10,841)
Provision for (benefit from) income taxes	116	139	(2,970)	166
Net loss	$ (9,243)	$ (8,291)	$ (15,601)	$ (11,007)
Net loss per common share:
Basic and diluted net (loss) income per common share (in USD per share)	$ (0.11)	$ (0.10)	$ (0.19)	$ (0.14)
Weighted-average number of shares used in computing net loss per share:
Weighted-average common shares outstanding for basic and diluted net loss per share	82,339	79,089	81,872	78,717
Software subscriptions
Revenues
Total revenues	$ 194,792	$ 145,959	$ 377,500	$ 282,919
Cost of revenues
Total cost of revenues	38,079	26,716	73,413	51,242
Other
Revenues
Total revenues	20,360	14,873	39,141	28,256
Cost of revenues
Total cost of revenues	$ 15,551	$ 11,350	$ 31,052	$ 22,498

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (9,243)	$ (8,291)	$ (15,601)	$ (11,007)
Other comprehensive loss
Foreign currency translation adjustments	242	(425)	(133)	(203)
Comprehensive loss	$ (9,001)	$ (8,716)	$ (15,734)	$ (11,210)

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY Statement - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Common stock outstanding, beginning balance (in shares) at Dec. 31, 2017		78,054
Stockholders' equity, beginning balance at Dec. 31, 2017	$ 228,346	$ 8	$ 434,840	$ 2,998	$ (209,500)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with Equity Incentive and Employee Stock Purchase plans (in shares)		801
Issuance of common stock in connection with Equity Incentive and Employee Stock Purchase plans	2,674		2,674
Shares repurchased (in shares)		(239)
Shares repurchased	(15,000)		(15,000)
Share-based compensation	13,427		13,427
Equity component of convertible senior notes, net of issuance costs	98,823		98,823
Purchase of capped calls	(49,910)		(49,910)
Changes in comprehensive loss	222			222
Net loss	(2,716)				(2,716)
Common stock outstanding, ending balance (in shares) at Mar. 31, 2018		78,616
Stockholders' equity, ending balance at Mar. 31, 2018	275,866	$ 8	484,854	3,220	(212,216)
Common stock outstanding, beginning balance (in shares) at Dec. 31, 2017		78,054
Stockholders' equity, beginning balance at Dec. 31, 2017	228,346	$ 8	434,840	2,998	(209,500)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(11,007)
Common stock outstanding, ending balance (in shares) at Jun. 30, 2018		79,597
Stockholders' equity, ending balance at Jun. 30, 2018	291,024	$ 8	508,728	2,795	(220,507)
Common stock outstanding, beginning balance (in shares) at Mar. 31, 2018		78,616
Stockholders' equity, beginning balance at Mar. 31, 2018	275,866	$ 8	484,854	3,220	(212,216)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with Equity Incentive and Employee Stock Purchase plans (in shares)		981
Issuance of common stock in connection with Equity Incentive and Employee Stock Purchase plans	6,069		6,069
Share-based compensation	17,805		17,805
Changes in comprehensive loss	(425)			(425)
Net loss	(8,291)				(8,291)
Common stock outstanding, ending balance (in shares) at Jun. 30, 2018		79,597
Stockholders' equity, ending balance at Jun. 30, 2018	291,024	$ 8	508,728	2,795	(220,507)
Common stock outstanding, 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 (in shares)		782
Issuance of common stock in connection with Equity Incentive and Employee Stock Purchase plans	732		732
Share-based compensation	19,616		19,616
Changes in comprehensive loss	(375)			(375)
Net loss	(6,358)				(6,358)
Common stock outstanding, 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)
Common stock outstanding, 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	(15,601)
Common stock outstanding, 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)
Common stock outstanding, 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 (in shares)		1,046
Issuance of common stock in connection with Equity Incentive and Employee Stock Purchase plans	7,730		7,730
Share-based compensation	25,614		25,614
Changes in comprehensive loss	242			242
Net loss	(9,243)				(9,243)
Common stock outstanding, 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)

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net loss	$ (15,601)	$ (11,007)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	16,486	11,476
Share-based compensation	44,314	30,864
Amortization of deferred sales commission costs	13,196	8,673
Amortization of debt discount and issuance costs	10,031	6,154
Foreign currency remeasurement (gain) loss	(323)	778
Provision for bad debt	995	1,137
Deferred income taxes	(347)	11
Tax benefit from release of valuation allowance	(3,210)	0
Other	1,232	210
Changes in assets and liabilities:
Accounts receivable	(10,804)	(21,462)
Deferred sales commission costs	(33,032)	(21,603)
Prepaid expenses and other current assets	(9,253)	(2,795)
Other assets	181	(626)
Accounts payable	11,146	(499)
Accrued liabilities	4,730	17,736
Deferred revenue	14,835	10,323
Other liabilities	(328)	(495)
Net cash provided by operating activities	44,248	28,875
Cash flows from investing activities
Purchases of property and equipment	(14,994)	(11,856)
Capitalized internal-use software	(7,602)	(5,367)
Cash paid for business combination, net of cash acquired	(27,870)	0
Cash paid for acquisition of intangible assets	0	(18,470)
Net cash used in investing activities	(50,466)	(35,693)
Cash flows from financing activities
Proceeds from issuance of convertible senior notes, net of issuance costs	0	449,457
Payments for capped call transactions and costs	0	(49,910)
Repurchase of common stock	0	(15,000)
Proceeds from issuance of stock in connection with stock plans	13,509	11,729
Taxes paid related to net share settlement of equity awards	(5,047)	(2,986)
Repayment of financing obligations	(943)	(741)
Net cash provided by financing activities	7,519	392,549
Effect of exchange rate changes	38	357
Net increase in cash, cash equivalents and restricted cash	1,339	386,088
Cash, cash equivalents and restricted cash
Beginning of period	566,329	181,192
End of period	567,668	567,280
Supplemental disclosure of cash flow data
Cash paid for interest	189	40
Cash paid for income taxes, net of refunds	351	239
Contingent consideration not paid relating to asset acquisition	0	3,848
Equipment and capitalized internal-use software purchased and unpaid at period end	2,077	1,075
Cash held for future indemnity claims	7,148	0
Equipment acquired under financing obligations	$ 0	$ 4,513

Description of Business and Sum

Description of Business and Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Summary of Significant Accounting Policies	Description of Business and Summary of Significant Accounting Policies 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, 2019 . 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”). Effective January 1, 2019, the Company adopted the requirements of Accounting Standards Update (“ASU”) 2016-02, Leases (Topic 842) ("Topic 842"), issued by the Financial Accounting Standards Board (“FASB”), as discussed in Note 2. 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, 2018 , filed with the SEC on February 27, 2019. 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, deferred sales commission costs, goodwill, useful lives of intangible assets, share-based compensation, capitalization of internally developed software, 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 could differ from these estimates. Changes in Significant Accounting Policies Except for the accounting policies for leases that were updated as a result of adopting Topic 842, there have been no changes to the Company's significant accounting policies described in the Annual Report on Form 10-K for the year ended December 31, 2018 , that have had a material impact on the Company’s condensed consolidated financial statements and related notes. Leases The Company determines if a contract is a lease or contains a lease at the inception of the contract and reassesses that conclusion if the contract is modified. All leases are assessed for classification as an operating lease or a finance lease. Operating lease right-of-use (“ROU”) assets are presented separately on the Company's Condensed Consolidated Balance Sheet. Operating lease liabilities are separated into a current portion, included within accrued liabilities on the Company's Condensed Consolidated Balance Sheet, and a non-current portion included within operating lease liabilities on the Company's Condensed Consolidated Balance Sheet. The Company does not have significant finance lease ROU assets or liabilities. ROU assets represent the Company's right to use an underlying asset for the lease term and lease liabilities represent its obligation to make lease payments arising from the lease. The Company does not obtain and control its right to use the identified asset until the lease commencement date. The Company’s lease liabilities are recognized at the applicable lease commencement date based on the present value of the lease payments required to be paid over the lease term. Because the rate implicit in the lease is not readily determinable, the Company generally uses its incremental borrowing rate to discount the lease payments to present value. The estimated incremental borrowing rate is derived from information available at the lease commencement date. The Company factors in publicly available data for instruments with similar characteristics when calculating its incremental borrowing rates. The Company's ROU assets are also recognized at the applicable lease commencement date. The ROU asset equals the carrying amount of the related lease liability, adjusted for any lease payments made prior to lease commencement and lease incentives provided by the lessor. Variable lease payments are expensed as incurred and do not factor into the measurement of the applicable ROU asset or lease liability. The term of the Company's leases equal the non-cancellable period of the lease, including any rent-free periods provided by the lessor, and also include options to renew or extend the lease (including by not terminating the lease) that the Company is reasonably certain to exercise. The Company establishes the term of each lease at lease commencement and reassesses that term in subsequent periods when one of the triggering events outlined in Topic 842 occurs. Operating lease cost for lease payments is recognized on a straight-line basis over the lease term. The Company's lease contracts often include lease and non-lease components. For facility leases, the Company has elected the practical expedient offered by the standard to not separate lease from non-lease components and accounts for them as a single lease component. For the Company's other contracts that include leases, the Company accounts for the lease and non-lease components separately. The Company has elected, for all classes of underlying assets, not to recognize ROU assets and lease liabilities for leases with a term of twelve months or less. Lease cost for short-term leases is recognized on a straight-line basis over the lease term. Additionally, for certain facility leases, the Company applies a portfolio approach, whereby it effectively accounts for the operating lease ROU assets and liabilities for multiple leases as a single unit of account because the accounting effect of doing so is not material. Recent Accounting Pronouncements Not Yet Adopted In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment , which modifies the goodwill impairment test and requires an entity to write down the carrying value of goodwill up to the amount by which the carrying amount of a reporting unit exceeds its fair value. The standard is effective for interim and annual reporting periods beginning after December 15, 2019, with early adoption permitted. The adoption of this amendment is not expected to have a material impact on the Company’s consolidated financial statements or disclosures. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurements, which expands the disclosure requirements for Level 3 fair value measurements and expands disclosures for entities that calculate net assets value. This amendment is applicable to all public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019, with early adoption permitted. The Company expects to adopt this update effective fiscal first quarter of 2020. The adoption of this amendment is not expected to have a material impact on the Company’s consolidated financial statements or disclosures. In August 2018, the FASB issued ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract , which aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. This amendment is applicable to all public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019, with early adoption permitted. The Company will early adopt this guidance in 2019 and does not expect implementation of this amendment to have a material impact on its financial statements or disclosures.

Impact of Recently Adopted Acco

Impact of Recently Adopted Accounting Pronouncements	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Impact of Recently Adopted Accounting Pronouncements	Impact of Recently Adopted Accounting Pronouncements On January 1, 2019, the Company adopted FASB ASU No. 2016-02, Leases (Topic 842), which requires recognition of ROU assets and lease liabilities for most leases on the Company’s Consolidated Balance Sheet. The Company adopted ASU 2016-02 using a modified retrospective transition approach as of the effective date as permitted by the amendments in ASU 2018-11. As a result, the Company was not required to adjust its comparative periods financial information for effects of the standard or make the new required lease disclosures for the periods before the date of adoption (i.e., January 1, 2019). The Company elected the package of practical expedients which allows the Company not to reassess (1) whether existing or expired contracts, as of the adoption date, contain leases, (2) the lease classification for existing leases, and (3) whether existing initial direct costs meet the new definition. The Company also elected the practical expedient to not separate lease and non-lease components for its facility leases, and to not recognize ROU assets and liabilities for short-term leases. The standard had a material impact on the Company’s Condensed Consolidated Balance Sheet but did not have a significant impact on its Condensed Consolidated Statement of Operations or Cash Flows. The most significant impact was the recognition of ROU assets and lease liabilities for operating leases. The adoption of this new standard at January 1, 2019, resulted in the following changes: • assets increased by $33.5 million , primarily representing the recognition of ROU assets for operating leases; and • liabilities increased by $33.5 million , primarily representing the recognition of lease liabilities for operating leases.

Revenue and Cost of Revenue

Revenue and Cost of Revenue	6 Months Ended
	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Revenue and Cost of Revenue	Revenue and Cost of Revenue The Company derives its revenues primarily from software subscriptions, sale of products, and professional services. Revenues are recognized when control of these services is transferred to the customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those services. Disaggregation of revenue The following table provides information about disaggregated revenue by primary geographical markets: Three Months Ended Six Months Ended 2019 2018 2019 2018 Primary geographical markets North America 95 % 96 % 95 % 96 % Others 5 4 5 4 Total revenues 100 % 100 % 100 % 100 % The Company derived approximately 91% of subscription revenues from RingCentral Office product for both the three and six months ended June 30, 2019 . The Company derived approximately 88% and 87% of subscription revenue from RingCentral Office product for the three and six months ended June 30, 2018 , respectively. Deferred revenue During the three and six months ended June 30, 2019 , the Company recognized revenue of $20.4 million and $69.5 million , respectively, that was included in the corresponding deferred revenue balance at the beginning of the period. Remaining performance obligations The typical subscription term ranges from one month to five years . Contracted revenue as of June 30, 2019 that has not yet been recognized was $0.8 billion . This excludes contracts with an original expected length of less than one year. The Company expects to recognize approximately 57% of this balance over the next 12 months and 43% thereafter. Other revenues and cost of revenues Other revenues are primarily comprised of product revenue from the sale of pre-configured phones, phone rentals, and professional services. Product revenues were $9.1 million and $8.8 million for the three months ended June 30, 2019 and 2018 , respectively, and $18.6 million and $16.8 million for the six months ended June 30, 2019 and 2018 , respectively. Cost of product revenues were $8.5 million and $7.5 million for the three months ended June 30, 2019 and 2018 , respectively, and $17.5 million and $15.3 million for the six months ended June 30, 2019 and 2018 , respectively.

Financial Statement Components

Financial Statement Components	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Financial Statement Components	Financial Statement Components Cash and cash equivalents consisted of the following (in thousands): June 30, 2019 December 31, 2018 Cash $ 76,255 $ 80,457 Money market funds 491,413 485,872 Total cash and cash equivalents $ 567,668 $ 566,329 Accounts receivable, net consisted of the following (in thousands): June 30, 2019 December 31, 2018 Accounts receivable $ 95,114 $ 82,740 Unbilled accounts receivable 12,944 14,141 Allowance for doubtful accounts (2,473 ) (2,506 ) Accounts receivable, net $ 105,585 $ 94,375 Prepaid expenses and other current assets consisted of the following (in thousands): June 30, 2019 December 31, 2018 Prepaid expenses $ 18,346 $ 14,805 Inventory 300 199 Other current assets 14,481 8,768 Total prepaid expenses and other current assets $ 33,127 $ 23,772 Property and equipment, net consisted of the following (in thousands): June 30, 2019 December 31, 2018 Computer hardware and software $ 111,110 $ 103,766 Internal-use software development costs 38,002 29,886 Furniture and fixtures 6,723 5,896 Leasehold improvements 8,537 6,863 Total property and equipment 164,372 146,411 Less: accumulated depreciation and amortization (85,823 ) (76,206 ) Property and equipment, net $ 78,549 $ 70,205 Depreciation and amortization expense was $6.5 million and $4.7 million for the three months ended June 30, 2019 and 2018 , respectively, and $12.3 million and $9.1 million for the six months ended June 30, 2019 and 2018 , respectively. The carrying value of goodwill is as follows (in thousands): Balance at December 31, 2018 $ 31,238 Connect First acquisition 24,465 Foreign currency translation adjustments (90 ) Balance at June 30, 2019 $ 55,613 The carrying values of intangible assets are as follows (in thousands): June 30, 2019 December 31, 2018 Estimated Lives Cost Accumulated Amortization Acquired Intangibles, Net Cost Accumulated Amortization Acquired Intangibles, Net Customer relationships 2 to 5 years $ 21,384 $ 6,324 $ 15,060 $ 20,121 $ 4,460 $ 15,661 Developed technology 3 to 5 years 18,085 4,631 13,454 6,098 2,279 3,819 Total acquired intangible assets $ 39,469 $ 10,955 $ 28,514 $ 26,219 $ 6,739 $ 19,480 Amortization expense from acquired intangible assets was $2.3 million and $1.2 million for the three months ended June 30, 2019 and 2018 respectively, and $4.2 million and $2.3 million for the six months ended June 30, 2019 and 2018 , 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. At June 30, 2019 , the weighted average amortization period for customer relationships and developed technology both were approximately 3.0 years . Estimated amortization expense for acquired intangible assets for the following five fiscal years and thereafter is as follows (in thousands): 2019 (remaining) $ 4,572 2020 8,800 2021 8,542 2022 4,747 2023 onwards 1,853 Total estimated amortization expense $ 28,514 Accrued liabilities consisted of the following (in thousands): June 30, 2019 December 31, 2018 Accrued compensation and benefits $ 24,705 $ 20,932 Accrued sales, use and telecom related taxes 23,353 19,609 Accrued marketing 14,292 12,291 Operating lease liabilities, short-term 13,092 — Other accrued expenses 45,633 47,855 Total accrued liabilities $ 121,075 $ 100,687 Deferred Sales Commission Costs Amortization expense for the deferred sales commission costs was $7.0 million and $4.7 million for the three months ended June 30, 2019 and 2018 respectively, and $13.2 million and $8.7 million for the six months ended June 30, 2019 and 2018 , 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	6 Months Ended
	Jun. 30, 2019
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): Balance at (Level 1) (Level 2) (Level 3) Cash equivalents: Money market funds $ 491,413 $ 491,413 $ — $ — Balance at (Level 1) (Level 2) (Level 3) Cash equivalents: Money market funds $ 485,872 $ 485,872 $ — $ — 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. As of June 30, 2019 , the fair value of the 0% convertible senior notes due 2023 (the “Notes”) was approximately $685.6 million . The fair value was determined based on the quoted price for the 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.

Business Acquisition

Business Acquisition	6 Months Ended
	Jun. 30, 2019
Business Combinations [Abstract]
Business Acquisition	Business 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 will vest over four years. The preliminary 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 no t 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.

Convertible Senior Notes

Convertible Senior Notes	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Convertible Senior Notes	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 Notes are senior unsecured obligations of the Company, do not bear regular interest, and the principal amount of the Notes does not accrete. The Notes may bear special interest under specified circumstances as outlined in the indenture relating to the issuance of Notes (the “Indenture”) or if the Notes are not freely tradeable as required by the Indenture. The 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 Notes is initially convertible into 12.2782 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 $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 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 Notes in connection with such make-whole fundamental change or during the relevant redemption period. The 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 Notes may convert all or a portion of their 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 Notes with cash. During the three months ended June 30, 2019 , the stock price condition allowing holders of the Notes to convert was met. As a result, holders have the option to convert their Notes at any time during the fiscal quarter ending September 30, 2019. The Notes may be convertible thereafter if one or more of the conversion conditions specified in the Indenture is satisfied during future measurement periods. The Company may redeem the 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 Notes. Upon the occurrence of a fundamental change (as defined in the Indenture) prior to the maturity date, holders may require the Company to repurchase all or a portion of the Notes for cash at a price equal to 100% of the principal amount of the 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 Notes was as follows (in thousands): June 30, 2019 Principal $ 460,000 Unamortized discount (76,927 ) Unamortized issuance cost (6,490 ) Net carrying amount $ 376,583 The following table sets forth the interest expense recognized related to the Notes (in thousands): Three Months Ended Six Months Ended 2019 2018 2019 2018 Amortization of debt discount $ 4,700 $ 4,474 $ 9,343 $ 5,756 Amortization of debt issuance costs 349 310 688 398 Total interest expense related to the Notes $ 5,049 $ 4,784 $ 10,031 $ 6,154 In connection with the offering of the Notes, the Company entered into privately-negotiated capped call transactions with certain counterparties (the “Capped Calls”). The Capped Calls each have an initial strike price of approximately $81.45 per share, subject to certain adjustments, which corresponds to the initial conversion price of the Notes. The Capped Calls have initial cap prices of $119.035 per share, subject to certain adjustments. The Capped Calls cover, subject to anti-dilution adjustments, approximately 5.6 million shares of Class A Common Stock. The Capped Calls are generally intended to reduce or offset the potential dilution to the Class A Common Stock upon any conversion of the Notes with such reduction or offset, as the case may be, subject to a cap based on the cap price. The Capped Calls settle in components commencing January 13, 2023 with the last component expiring on March 13, 2023 . The 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 Capped Calls are subject to certain specified additional disruption events that may give rise to a termination of the 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 $49.9 million

Leases

Leases	6 Months Ended
	Jun. 30, 2019
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 June 30, 2019 , non-cancelable leases expire on various dates between 2019 and 2024. Generally, the non-cancelable leases include one or more options to renew, with renewal terms that can extend the lease term from one to five years or more. The Company has the right to exercise or forego the lease renewal options. The lease agreements do not contain any material residual value guarantees or material restrictive covenants. As of June 30, 2019 , the components of leases and lease costs are as follows (in thousands): June 30, 2019 Operating leases Operating lease right-of-use assets $ 34,341 Accrued liabilities $ 13,092 Operating lease liabilities 24,911 Total operating lease liabilities $ 38,003 Three Months Ended Six Months Ended Lease Cost Operating lease cost (a) $ 4,389 $ 8,438 (a) Includes short-term leases and variable lease costs, which are immaterial. Operating Leases June 30, 2019 December 31, 2018 Maturity of Lease Liabilities 2019 (remaining) $ 7,529 $ 13,470 2020 13,986 12,057 2021 10,346 8,399 2022 5,304 4,009 2023 3,954 3,224 2024 onwards 167 28 Total future minimum lease payments 41,286 41,187 Less: Imputed interest (3,283 ) — Present value of lease liabilities $ 38,003 $ 41,187 Other supplemental information as of June 30, 2019 is as follows (in thousand): June 30, 2019 Lease Term and Discount Rate Weighted-average remaining operating lease term (years) 2.7 Weighted-average operating lease discount rate 5 % Six Months Ended Supplemental Cash Flow Information Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows resulting from operating leases $ 7,746 New ROU assets obtained in exchange of lease liabilities: Operating leases $ 6,968 As of June 30, 2019 , the Company has additional operating leases of approximately $8.5 million that have not yet commenced and as such, have not yet been recognized on the Company’s Condensed Consolidated Balance Sheet. These operating leases are expected to commence in 2019 with lease terms up to ten

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2019
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 Matters On April 21, 2016, Supply Pro Sorbents, LLC (“SPS”) filed a putative class action against the Company in the United States District Court for the Northern District of California, alleging common law conversion and violations of the federal Telephone Consumer Protection Act (“TCPA”) arising from fax cover sheets used by the Company’s customers when sending facsimile transmissions over the Company’s system (“SPS Lawsuit”). SPS seeks statutory damages, costs, attorneys’ fees and an injunction in connection with its TCPA claim, and unspecified damages and punitive damages in connection with its conversion claim. On July 6, 2016, the Company filed a Petition for Expedited Declaratory Ruling before the Federal Communications Commission (“FCC”), requesting that the FCC issue a ruling clarifying certain portions of its regulations promulgated under TCPA at issue in the SPS Lawsuit (“Petition”). The Petition remains pending. On July 8, 2016, the Company filed a motion to dismiss the SPS Lawsuit in its entirety, along with a collateral motion to dismiss or stay the SPS Lawsuit pending a ruling by the FCC on the Company’s Petition. On October 7, 2016, the district court granted the Company’s motion to dismiss. The district court concurrently dismissed the Company’s motion to dismiss or stay as moot. Plaintiff filed its amended complaint on October 27, 2016, alleging essentially the same theories and claims. On November 21, 2016, the Company filed a motion to dismiss the amended complaint, along with a renewed motion to dismiss or stay the case pending resolution of the FCC Petition. On July 17, 2017, the district court granted the Company’s motion to dismiss with prejudice and concurrently dismissed the Company’s motion to dismiss or stay as moot. SPS filed a notice of appeal to the Ninth Circuit Court of Appeals on July 28, 2017. SPS’s opening brief on appeal was filed on December 20, 2017; asking that the dismissal be reversed and the case be returned to the district court for the Lawsuit to proceed. The Company’s answering brief was filed on February 20, 2018; asking that the dismissal be affirmed. SPS filed its reply brief on April 12, 2018. The Ninth Circuit Court of Appeals issued a decision on November 20, 2018, affirming the order of the district court and finding in RingCentral’s favor. On December 4, 2018, SPS filed a petition for panel rehearing, which RingCentral responded to on January 9, 2019. On January 28, 2019, the Ninth Circuit Court of Appeals denied SPS’ petition for rehearing. On April 29, 2019, SPS filed a petition in the Supreme Court for a writ of certiorari. On June 17, 2019, the Supreme Court denied SPS’s certiorari. The Supreme Court’s denial of certiorari means that the judgment in favor of the Company, dismissing the SPS lawsuit, is now final. 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 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 affirmatives defenses to the second amended complaint on October 18, 2018. Plaintiff filed a petition to certify a class on July 9, 2019. The Company’s opposition to the petition is due August 9, 2019. Discovery is ongoing. It is too early to predict the outcome of this lawsuit. Based on the information known to 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. 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

Share-Based Compensation

Share-Based Compensation	6 Months Ended
	Jun. 30, 2019
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 Six Months Ended 2019 2018 2019 2018 Cost of revenues $ 2,120 $ 1,301 $ 3,761 $ 2,311 Research and development 5,508 3,906 9,770 7,000 Sales and marketing 9,799 7,189 17,407 12,230 General and administrative 7,489 5,201 13,376 9,323 Total share-based compensation expense $ 24,916 $ 17,597 $ 44,314 $ 30,864 A summary of share-based compensation expense by award type is as follows (in thousands): Three Months Ended Six Months Ended 2019 2018 2019 2018 Options $ 204 $ 836 $ 739 $ 1,964 Employee stock purchase plan rights 1,043 747 1,942 1,482 Restricted stock units 23,669 16,014 41,633 27,418 Total share-based compensation expense $ 24,916 $ 17,597 $ 44,314 $ 30,864 Equity Incentive Plans As of June 30, 2019 , a total of 15,958,460 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 June 30, 2019 and changes during the period then ended is presented in the following table: Number of Options Outstanding (in thousands) Weighted- Average Exercise Price Per Share Weighted- Average Contractual Term (in Years) Aggregate Intrinsic Value (in thousands) Outstanding at December 31, 2018 4,131 $ 10.86 3.3 $ 295,921 Granted — — Exercised (788 ) 7.78 Canceled/Forfeited (125 ) 1.67 Outstanding at June 30, 2019 3,218 $ 11.97 2.9 $ 331,569 Vested and expected to vest as of June 30, 2019 3,216 $ 11.96 2.9 $ 331,165 Exercisable as of June 30, 2019 3,160 $ 11.86 2.9 $ 325,619 There were no options granted during the three and six months ended June 30, 2019 and 2018 . The total intrinsic value of options exercised during the three months ended June 30, 2019 and 2018 were $48.2 million and $19.3 million , respectively, and $80.3 million and $39.2 million , during the six months ended June 30, 2019 and 2018 , respectively. As of June 30, 2019 , there was approximately $0.3 million 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 0.7 years . Employee Stock Purchase Plan The 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 June 30, 2019 , there was a total of $1.5 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 0.4 years . At June 30, 2019 , a total of 3,991,688 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 June 30, 2019 , and changes during the period then ended is presented in the following table: Number of RSUs Outstanding (in thousands) Weighted- Average Grant Date Fair Value Per Share Aggregate Intrinsic Value (in thousands) Outstanding at December 31, 2018 3,561 $ 42.09 $ 293,523 Granted 1,334 110.04 Released (975 ) 45.13 Canceled/Forfeited (175 ) 56.38 Outstanding at June 30, 2019 3,745 $ 64.96 $ 430,473 As of June 30, 2019 , there was a total of $176.3 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 2.5 years . Bonus Plan In December 2017, the Company's board of directors (the "Board") adopted the Selective 2018 Key Employee Equity Bonus Plan (the "2018 KEEB Plan”), which became effective on January 1, 2018, and in December 2018, the Board adopted the Selective 2019 Key Employee Equity Bonus Plan (the "2019 KEEB Plan" and together with the 2018 KEEB Plan the "KEEB Plans"), which became effective on January 1, 2019. Both the 2018 KEEB Plan and the 2019 KEEB Plan allow the recipients to earn fully vested shares of the Company’s common stock upon the achievement of quarterly service and performance conditions. During the quarter ended June 30, 2019 , 33,329 RSUs were issued under the 2019 KEEB Plan. The total requisite service period of each quarterly award is approximately 0.4 years . The unrecognized share-based compensation expense was approximately $1.2 million , which will be recognized over the remaining service period of 0.1 years. The shares issued under this plan will be issued from the Company’s 2013 Plan shares available for issuance.

Segment Reporting

Segment Reporting	6 Months Ended
	Jun. 30, 2019
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 June 30, 2019 and December 31, 2018 , none of the Company’s customers accounted for more than 10% of the Company’s total accounts receivable. Long-lived assets by geographic location is based on the location of the legal entity that owns the asset. At June 30, 2019 and December 31, 2018 , more than 76% and 67% of the Company’s consolidated long-lived assets, respectively, were located in the U.S. France represented 17% and 26% of the Company's consolidated long-lived assets, including fair value adjustments relating to the acquisition of Dimelo SA, as of June 30, 2019 and December 31, 2018 , respectively. No other single country outside of the U.S. represented more than 10% of the Company’s consolidated long-lived assets.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The provision for (benefit from) income taxes for the three months ended June 30, 2019 and 2018 , was $0.1 million and $0.1 million , respectively, and was $(3.0) million and $0.2 million for the six months ended June 30, 2019 and 2018 , respectively. The provision for (benefit from) income taxes consisted primarily of state minimum taxes and foreign income taxes. For the three and six months ended June 30, 2019 and 2018 , 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, 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 six months ended June 30, 2019 . The Company realized no benefit for the current year losses due to a full valuation allowance against the U.S. and the 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 June 30, 2019 and December 31, 2018 . 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 six months ended June 30, 2019 , there were no material changes to the total amount of unrecognized tax benefits.

Basic and Diluted Net Loss Per

Basic and Diluted Net Loss Per Share	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Basic and Diluted Net Loss Per Share	Basic and Diluted Net Loss Per Share Basic net loss per share is computed by dividing the net loss by the weighted-average number of shares of common stock outstanding during the period, less the weighted-average unvested common stock subject to repurchase or forfeiture as they are not deemed to be issued for accounting purposes. 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 six months ended June 30, 2019 and 2018 , 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 Six Months Ended 2019 2018 2019 2018 Numerator Net loss $ (9,243 ) $ (8,291 ) $ (15,601 ) $ (11,007 ) Denominator: Weighted-average common shares outstanding for basic and diluted net loss per share 82,339 79,089 81,872 78,717 Basic and diluted net loss per share $ (0.11 ) $ (0.10 ) $ (0.19 ) $ (0.14 ) 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 Six Months Ended 2019 2018 2019 2018 Shares of common stock issuable under equity incentive awards outstanding 7,292 9,478 7,381 9,403 Convertible senior notes 1,657 — 1,311 — Potential common shares excluded from diluted net loss per share 8,949 9,478 8,692 9,403 Since the Company expects to settle the principal amount of its outstanding convertible senior notes in cash and any excess in cash or shares of the Company’s 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 common stock for a given period exceeds the conversion price of $81.45 per share for the Notes.

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2019
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions In 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 June 30, 2019 and December 31, 2018 were $2.9 million and $1.2 million , respectively. Total expenses incurred from Google Inc. were $4.8 million and 4.4 million in the three months ended June 30, 2019 and 2018 , respectively, and $9.4 million and $9.5 million in the six months ended June 30, 2019 and 2018 , respectively.

Description of Business and S_2

Description of Business and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2019
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, 2019 . 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”). Effective January 1, 2019, the Company adopted the requirements of Accounting Standards Update (“ASU”) 2016-02, Leases (Topic 842) ("Topic 842"), issued by the Financial Accounting Standards Board (“FASB”), as discussed in Note 2. 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, 2018 , filed with the SEC on February 27, 2019.
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, deferred sales commission costs, goodwill, useful lives of intangible assets, share-based compensation, capitalization of internally developed software, 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 could differ from these estimates.
Changes in Significant Accounting Policies	Changes in Significant Accounting Policies Except for the accounting policies for leases that were updated as a result of adopting Topic 842, there have been no changes to the Company's significant accounting policies described in the Annual Report on Form 10-K for the year ended December 31, 2018 , that have had a material impact on the Company’s condensed consolidated financial statements and related notes.
Leases	Leases The Company determines if a contract is a lease or contains a lease at the inception of the contract and reassesses that conclusion if the contract is modified. All leases are assessed for classification as an operating lease or a finance lease. Operating lease right-of-use (“ROU”) assets are presented separately on the Company's Condensed Consolidated Balance Sheet. Operating lease liabilities are separated into a current portion, included within accrued liabilities on the Company's Condensed Consolidated Balance Sheet, and a non-current portion included within operating lease liabilities on the Company's Condensed Consolidated Balance Sheet. The Company does not have significant finance lease ROU assets or liabilities. ROU assets represent the Company's right to use an underlying asset for the lease term and lease liabilities represent its obligation to make lease payments arising from the lease. The Company does not obtain and control its right to use the identified asset until the lease commencement date. The Company’s lease liabilities are recognized at the applicable lease commencement date based on the present value of the lease payments required to be paid over the lease term. Because the rate implicit in the lease is not readily determinable, the Company generally uses its incremental borrowing rate to discount the lease payments to present value. The estimated incremental borrowing rate is derived from information available at the lease commencement date. The Company factors in publicly available data for instruments with similar characteristics when calculating its incremental borrowing rates. The Company's ROU assets are also recognized at the applicable lease commencement date. The ROU asset equals the carrying amount of the related lease liability, adjusted for any lease payments made prior to lease commencement and lease incentives provided by the lessor. Variable lease payments are expensed as incurred and do not factor into the measurement of the applicable ROU asset or lease liability. The term of the Company's leases equal the non-cancellable period of the lease, including any rent-free periods provided by the lessor, and also include options to renew or extend the lease (including by not terminating the lease) that the Company is reasonably certain to exercise. The Company establishes the term of each lease at lease commencement and reassesses that term in subsequent periods when one of the triggering events outlined in Topic 842 occurs. Operating lease cost for lease payments is recognized on a straight-line basis over the lease term. The Company's lease contracts often include lease and non-lease components. For facility leases, the Company has elected the practical expedient offered by the standard to not separate lease from non-lease components and accounts for them as a single lease component. For the Company's other contracts that include leases, the Company accounts for the lease and non-lease components separately. The Company has elected, for all classes of underlying assets, not to recognize ROU assets and lease liabilities for leases with a term of twelve months or less. Lease cost for short-term leases is recognized on a straight-line basis over the lease term. Additionally, for certain facility leases, the Company applies a portfolio approach, whereby it effectively accounts for the operating lease ROU assets and liabilities for multiple leases as a single unit of account because the accounting effect of doing so is not material.
Recent Accounting Pronouncements Not Yet Adopted	Recent Accounting Pronouncements Not Yet Adopted In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment , which modifies the goodwill impairment test and requires an entity to write down the carrying value of goodwill up to the amount by which the carrying amount of a reporting unit exceeds its fair value. The standard is effective for interim and annual reporting periods beginning after December 15, 2019, with early adoption permitted. The adoption of this amendment is not expected to have a material impact on the Company’s consolidated financial statements or disclosures. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurements, which expands the disclosure requirements for Level 3 fair value measurements and expands disclosures for entities that calculate net assets value. This amendment is applicable to all public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019, with early adoption permitted. The Company expects to adopt this update effective fiscal first quarter of 2020. The adoption of this amendment is not expected to have a material impact on the Company’s consolidated financial statements or disclosures. In August 2018, the FASB issued ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract , which aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. This amendment is applicable to all public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019, with early adoption permitted. The Company will early adopt this guidance in 2019 and does not expect implementation of this amendment to have a material impact on its financial statements or disclosures.

Revenue and Cost of Revenue (Ta

Revenue and Cost of Revenue (Tables)	6 Months Ended
	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	Disaggregation of revenue The following table provides information about disaggregated revenue by primary geographical markets: Three Months Ended Six Months Ended 2019 2018 2019 2018 Primary geographical markets North America 95 % 96 % 95 % 96 % Others 5 4 5 4 Total revenues 100 % 100 % 100 % 100 %

Financial Statement Components

Financial Statement Components (Tables)	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Components of Cash and Cash Equivalents	Cash and cash equivalents consisted of the following (in thousands): June 30, 2019 December 31, 2018 Cash $ 76,255 $ 80,457 Money market funds 491,413 485,872 Total cash and cash equivalents $ 567,668 $ 566,329
Components of Accounts Receivable, Net	Accounts receivable, net consisted of the following (in thousands): June 30, 2019 December 31, 2018 Accounts receivable $ 95,114 $ 82,740 Unbilled accounts receivable 12,944 14,141 Allowance for doubtful accounts (2,473 ) (2,506 ) Accounts receivable, net $ 105,585 $ 94,375
Components of Prepaid Expenses and Other Current Assets	Prepaid expenses and other current assets consisted of the following (in thousands): June 30, 2019 December 31, 2018 Prepaid expenses $ 18,346 $ 14,805 Inventory 300 199 Other current assets 14,481 8,768 Total prepaid expenses and other current assets $ 33,127 $ 23,772
Components of Property and Equipment, Net	Property and equipment, net consisted of the following (in thousands): June 30, 2019 December 31, 2018 Computer hardware and software $ 111,110 $ 103,766 Internal-use software development costs 38,002 29,886 Furniture and fixtures 6,723 5,896 Leasehold improvements 8,537 6,863 Total property and equipment 164,372 146,411 Less: accumulated depreciation and amortization (85,823 ) (76,206 ) Property and equipment, net $ 78,549 $ 70,205
Schedule of Goodwill	The carrying value of goodwill is as follows (in thousands): Balance at December 31, 2018 $ 31,238 Connect First acquisition 24,465 Foreign currency translation adjustments (90 ) Balance at June 30, 2019 $ 55,613
Summary of Carrying Values of Intangible Assets	The carrying values of intangible assets are as follows (in thousands): June 30, 2019 December 31, 2018 Estimated Lives Cost Accumulated Amortization Acquired Intangibles, Net Cost Accumulated Amortization Acquired Intangibles, Net Customer relationships 2 to 5 years $ 21,384 $ 6,324 $ 15,060 $ 20,121 $ 4,460 $ 15,661 Developed technology 3 to 5 years 18,085 4,631 13,454 6,098 2,279 3,819 Total acquired intangible assets $ 39,469 $ 10,955 $ 28,514 $ 26,219 $ 6,739 $ 19,480
Summary of Estimated Amortization Expense for Acquired Intangible Assets	Estimated amortization expense for acquired intangible assets for the following five fiscal years and thereafter is as follows (in thousands): 2019 (remaining) $ 4,572 2020 8,800 2021 8,542 2022 4,747 2023 onwards 1,853 Total estimated amortization expense $ 28,514
Components of Accrued Liabilities	Accrued liabilities consisted of the following (in thousands): June 30, 2019 December 31, 2018 Accrued compensation and benefits $ 24,705 $ 20,932 Accrued sales, use and telecom related taxes 23,353 19,609 Accrued marketing 14,292 12,291 Operating lease liabilities, short-term 13,092 — Other accrued expenses 45,633 47,855 Total accrued liabilities $ 121,075 $ 100,687

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2019
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): Balance at (Level 1) (Level 2) (Level 3) Cash equivalents: Money market funds $ 491,413 $ 491,413 $ — $ — Balance at (Level 1) (Level 2) (Level 3) Cash equivalents: Money market funds $ 485,872 $ 485,872 $ — $ —

Business Acquisition (Tables)

Business Acquisition (Tables)	6 Months Ended
	Jun. 30, 2019
Business Combinations [Abstract]
Schedule of Allocation of the Purchase Price of the Assets Acquired and Liabilities Assumed	The preliminary 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)	6 Months Ended
	Jun. 30, 2019
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 Notes was as follows (in thousands): June 30, 2019 Principal $ 460,000 Unamortized discount (76,927 ) Unamortized issuance cost (6,490 ) Net carrying amount $ 376,583
Schedule of Interest Expense Recognized Related to Notes	The following table sets forth the interest expense recognized related to the Notes (in thousands): Three Months Ended Six Months Ended 2019 2018 2019 2018 Amortization of debt discount $ 4,700 $ 4,474 $ 9,343 $ 5,756 Amortization of debt issuance costs 349 310 688 398 Total interest expense related to the Notes $ 5,049 $ 4,784 $ 10,031 $ 6,154

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Components of Leases	As of June 30, 2019 , the components of leases and lease costs are as follows (in thousands): June 30, 2019 Operating leases Operating lease right-of-use assets $ 34,341 Accrued liabilities $ 13,092 Operating lease liabilities 24,911 Total operating lease liabilities $ 38,003
Lease Cost	Other supplemental information as of June 30, 2019 is as follows (in thousand): June 30, 2019 Lease Term and Discount Rate Weighted-average remaining operating lease term (years) 2.7 Weighted-average operating lease discount rate 5 % Six Months Ended Supplemental Cash Flow Information Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows resulting from operating leases $ 7,746 New ROU assets obtained in exchange of lease liabilities: Operating leases $ 6,968 As of June 30, 2019 , the components of leases and lease costs are as follows (in thousands): June 30, 2019 Operating leases Operating lease right-of-use assets $ 34,341 Accrued liabilities $ 13,092 Operating lease liabilities 24,911 Total operating lease liabilities $ 38,003 Three Months Ended Six Months Ended Lease Cost Operating lease cost (a) $ 4,389 $ 8,438 (a) Includes short-term leases and variable lease costs, which are immaterial.
Schedule of Future Operating Lease Maturities	Operating Leases June 30, 2019 December 31, 2018 Maturity of Lease Liabilities 2019 (remaining) $ 7,529 $ 13,470 2020 13,986 12,057 2021 10,346 8,399 2022 5,304 4,009 2023 3,954 3,224 2024 onwards 167 28 Total future minimum lease payments 41,286 41,187 Less: Imputed interest (3,283 ) — Present value of lease liabilities $ 38,003 $ 41,187

Share-Based Compensation (Table

Share-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2019
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 Six Months Ended 2019 2018 2019 2018 Cost of revenues $ 2,120 $ 1,301 $ 3,761 $ 2,311 Research and development 5,508 3,906 9,770 7,000 Sales and marketing 9,799 7,189 17,407 12,230 General and administrative 7,489 5,201 13,376 9,323 Total share-based compensation expense $ 24,916 $ 17,597 $ 44,314 $ 30,864
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 Six Months Ended 2019 2018 2019 2018 Options $ 204 $ 836 $ 739 $ 1,964 Employee stock purchase plan rights 1,043 747 1,942 1,482 Restricted stock units 23,669 16,014 41,633 27,418 Total share-based compensation expense $ 24,916 $ 17,597 $ 44,314 $ 30,864
Summary of Stock Option Activity Plans	A summary of option activity under all of the Company’s equity incentive plans at June 30, 2019 and changes during the period then ended is presented in the following table: Number of Options Outstanding (in thousands) Weighted- Average Exercise Price Per Share Weighted- Average Contractual Term (in Years) Aggregate Intrinsic Value (in thousands) Outstanding at December 31, 2018 4,131 $ 10.86 3.3 $ 295,921 Granted — — Exercised (788 ) 7.78 Canceled/Forfeited (125 ) 1.67 Outstanding at June 30, 2019 3,218 $ 11.97 2.9 $ 331,569 Vested and expected to vest as of June 30, 2019 3,216 $ 11.96 2.9 $ 331,165 Exercisable as of June 30, 2019 3,160 $ 11.86 2.9 $ 325,619
Summary of RSUs Activity	A summary of activity of RSUs under the 2013 Plan at June 30, 2019 , and changes during the period then ended is presented in the following table: Number of RSUs Outstanding (in thousands) Weighted- Average Grant Date Fair Value Per Share Aggregate Intrinsic Value (in thousands) Outstanding at December 31, 2018 3,561 $ 42.09 $ 293,523 Granted 1,334 110.04 Released (975 ) 45.13 Canceled/Forfeited (175 ) 56.38 Outstanding at June 30, 2019 3,745 $ 64.96 $ 430,473

Basic and Diluted Net Loss Pe_2

Basic and Diluted Net Loss Per Share (Tables)	6 Months Ended
	Jun. 30, 2019
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 Six Months Ended 2019 2018 2019 2018 Numerator Net loss $ (9,243 ) $ (8,291 ) $ (15,601 ) $ (11,007 ) Denominator: Weighted-average common shares outstanding for basic and diluted net loss per share 82,339 79,089 81,872 78,717 Basic and diluted net loss per share $ (0.11 ) $ (0.10 ) $ (0.19 ) $ (0.14 )
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 Six Months Ended 2019 2018 2019 2018 Shares of common stock issuable under equity incentive awards outstanding 7,292 9,478 7,381 9,403 Convertible senior notes 1,657 — 1,311 — Potential common shares excluded from diluted net loss per share 8,949 9,478 8,692 9,403

Impact of Recently Adopted Ac_2

Impact of Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use-assets	$ 34,341
Operating lease liabilities	$ 38,003		$ 41,187
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use-assets		$ 33,500
Operating lease liabilities		$ 33,500

Revenue and Cost of Revenue - A

Revenue and Cost of Revenue - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Percentage of revenue	100.00%	100.00%	100.00%	100.00%
Percentage of subscriptions	91.00%	88.00%	91.00%	87.00%
Revenue recognized	$ 20,400		$ 69,500
Revenue, remaining performance obligation, amount	800,000		800,000
Product revenues	215,152	$ 160,832	416,641	$ 311,175
Product cost of revenues	53,630	38,066	104,465	73,740
Product
Disaggregation of Revenue [Line Items]
Product revenues	9,100	8,800	18,600	16,800
Product cost of revenues	$ 8,500	$ 7,500	$ 17,500	$ 15,300
North America
Disaggregation of Revenue [Line Items]
Percentage of revenue	95.00%	96.00%	95.00%	96.00%
Others
Disaggregation of Revenue [Line Items]
Percentage of revenue	5.00%	4.00%	5.00%	4.00%
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

Revenue and Cost of Revenue - P

Revenue and Cost of Revenue - Performance Obligation, Timing of Satisfaction (Details)	Jun. 30, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation, percentage	57.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation, percentage	43.00%

Financial Statement Component_2

Financial Statement Components - Components of Cash and Cash Equivalents (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash	$ 76,255	$ 80,457
Money market funds	491,413	485,872
Total cash and cash equivalents	$ 567,668	$ 566,329

Financial Statement Component_3

Financial Statement Components - Components of Accounts Receivable, Net (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts receivable	$ 95,114	$ 82,740
Unbilled accounts receivable	12,944	14,141
Allowance for doubtful accounts	(2,473)	(2,506)
Accounts receivable, net	$ 105,585	$ 94,375

Financial Statement Component_4

Financial Statement Components - Components of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Prepaid expenses	$ 18,346	$ 14,805
Inventory	300	199
Other current assets	14,481	8,768
Total prepaid expenses and other current assets	$ 33,127	$ 23,772

Financial Statement Component_5

Financial Statement Components - Components of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 164,372	$ 146,411
Less: accumulated depreciation and amortization	(85,823)	(76,206)
Property and equipment, net	78,549	70,205
Computer hardware and software
Property, Plant and Equipment [Line Items]
Total property and equipment	111,110	103,766
Internal-use software development costs
Property, Plant and Equipment [Line Items]
Total property and equipment	38,002	29,886
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	6,723	5,896
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 8,537	$ 6,863

Financial Statement Component_6

Financial Statement Components - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Finite-Lived Intangible Assets [Line Items]
Depreciation and amortization	$ 6,500,000	$ 4,700,000	$ 12,300,000	$ 9,100,000
Amortization expense of Intangible Assets	2,300,000	1,200,000	4,200,000	2,300,000
Amortization of deferred sales commission costs	7,000,000	4,700,000	13,196,000	8,673,000
Impairment loss in relation to costs capitalized	$ 0	$ 0	$ 0	$ 0
Customer relationships and developed technology
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization periods			3 years

Financial Statement Component_7

Financial Statement Components - Components of Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 31,238
ConnectFirst acquisition	24,465
Foreign currency translation adjustments	(90)
Goodwill, ending balance	$ 55,613

Financial Statement Component_8

Financial Statement Components - Summary of Carrying Values of Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Cost	$ 39,469	$ 26,219
Accumulated Amortization	10,955	6,739
Total	28,514	19,480
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Cost	21,384	20,121
Accumulated Amortization	6,324	4,460
Total	$ 15,060	15,661
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	$ 18,085	6,098
Accumulated Amortization	4,631	2,279
Total	$ 13,454	$ 3,819
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 (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
2019 (remaining)	$ 4,572
2020	8,800
2021	8,542
2022	4,747
2023 onwards	1,853
Total	$ 28,514	$ 19,480

Financial Statement Componen_10

Financial Statement Components - Components of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued compensation and benefits	$ 24,705	$ 20,932
Accrued sales, use and telecom related taxes	23,353	19,609
Accrued marketing	14,292	12,291
Operating lease liabilities, short-term	13,092
Other accrued expenses	45,633	47,855
Total accrued liabilities	$ 121,075	$ 100,687

Fair Value of Financial Instr_3

Fair Value of Financial Instruments - Financial Assets Carried at Fair Value (Detail) - Money Market Funds - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	$ 491,413	$ 485,872
(Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	491,413	485,872
(Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	0	0
(Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	$ 0	$ 0

Fair Value of Financial Instr_4

Fair Value of Financial Instruments - Additional Information (Detail) - Convertible senior notes - USD ($) $ in Millions	Jun. 30, 2019	Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, interest rate, percentage		0.00%
(Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, interest rate, percentage	0.00%
Fair value of convertible senior notes	$ 685.6

Business Acquisition - Additio

Business Acquisition - Additional Information (Detail) - USD ($)	Jan. 14, 2019	Jun. 30, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill		$ 55,613,000	$ 31,238,000
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
Restricted stock units | Connect First, Inc.
Business Acquisition [Line Items]
Consideration, restricted stock unit	$ 4,000,000
Consideration, restricted stock unit, vesting period	4 years

Business Acquisition - Prelimi

Business Acquisition - Preliminary Purchase Price Allocation (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 14, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill	$ 55,613		$ 31,238
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 - Addi

Convertible Senior Notes - Additional Information (Detail) - USD ($)	1 Months Ended	6 Months Ended
	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Debt Instrument [Line Items]
Principal		$ 460,000,000
Proceeds from issuance debt, net of discounts and issuance costs		0	$ 449,457,000
Net cost incurred in connection with transaction		$ 0	$ 49,910,000
Convertible senior notes
Debt Instrument [Line Items]
Debt instrument, interest rate, percentage	0.00%
Proceeds from issuance debt, net of discounts and issuance costs	$ 449,500,000
Conversion price per share (USD per share)		$ 81.45
Convertible senior notes | Capped call
Debt Instrument [Line Items]
Conversion price per share (USD per share)		119.035
Initial strike price (USD per share)		$ 81.45
Net cost incurred in connection with transaction		$ 49,900,000
Convertible senior notes | Class A common stock
Debt Instrument [Line Items]
Principal amount of note convertible in to shares	$ 1,000
Debt conversion, converted instrument, shares issued (in shares)	12.2782
Stock par value (USD per share)	$ 0.0001
Conversion price per share (USD per share)	$ 81.45
Convertible senior notes | Class A common stock | Capped call
Debt Instrument [Line Items]
Option indexed to issuer's equity (in shares)		5,600,000
Convertible senior notes | Private Placement
Debt Instrument [Line Items]
Principal	$ 460,000,000
Scenario Three | Convertible senior notes
Debt Instrument [Line Items]
Debt redemption price percentage	100.00%

Convertible Senior Notes - Summ

Convertible Senior Notes - Summary of Net Carrying Amount of Liability Component of Notes (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
Principal	$ 460,000
Unamortized discount	(76,927)
Unamortized issuance cost	(6,490)
Net carrying amount	$ 376,583	$ 366,552

Convertible Senior Notes - Sche

Convertible Senior Notes - Schedule of Interest Expense Recognized Related to Notes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Debt Instrument [Line Items]
Total interest expense related to the Notes	$ 5,088	$ 4,836	$ 10,120	$ 6,247
Convertible senior notes
Debt Instrument [Line Items]
Amortization of debt discount	4,700	4,474	9,343	5,756
Amortization of debt issuance costs	349	310	688	398
Total interest expense related to the Notes	$ 5,049	$ 4,784	$ 10,031	$ 6,154

Leases - Components of Leases

Leases - Components of Leases and Lease Costs (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Operating leases
Operating lease right-of-use assets	$ 34,341
Accrued liabilities	13,092
Operating lease liabilities	24,911
Total operating lease liabilities	$ 38,003	$ 41,187
Minimum
Lessee, Lease, Description [Line Items]
Operating lease renewal term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Operating lease renewal term	5 years

Leases - Lease Cost (Details)

Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Leases [Abstract]
Operating lease cost	$ 4,389	$ 8,438

Leases - Schedule of Future Lea

Leases - Schedule of Future Lease Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2019 (remaining)	$ 7,529	$ 13,470
2020	13,986	12,057
2021	10,346	8,399
2022	5,304	4,009
2023	3,954	3,224
2024 onwards	167	28
Total future minimum lease payments	41,286	41,187
Less: Imputed interest	(3,283)	0
Present value of lease liabilities	$ 38,003	$ 41,187

Leases - Lease Term and Discoun

Leases - Lease Term and Discount Rate (Details)	Jun. 30, 2019
Leases [Abstract]
Weighted-average remaining operating lease term (years)	2 years 8 months 12 days
Weighted-average operating lease discount rate	5.00%

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)
Leases [Abstract]
Operating cash flows resulting from operating leases	$ 7,746
New ROU assets obtained in exchange of lease liabilities:	$ 6,968

Leases - Leases not yet Commenc

Leases - Leases not yet Commenced (Details) $ in Millions	Jun. 30, 2019USD ($)
Lessee, Lease, Description [Line Items]
Operating lease not yet commenced, amount	$ 8.5
Maximum
Lessee, Lease, Description [Line Items]
Operating lease not yet commenced, lease terms (in years)	10 years

Share-Based Compensation - Addi

Share-Based Compensation - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
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	$ 48.2	$ 19.3	$ 80.3	$ 39.2
2013 Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Available for future grants (in shares)	3,991,688		3,991,688
Unrecognized share-based compensation expense	$ 1.5		$ 1.5
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense, remaining weighted-average vesting periods			8 months 12 days
Unrecognized share-based compensation expense	0.3		$ 0.3
2013 Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense, remaining weighted-average vesting periods			4 months 24 days
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 6 months
Vesting period contractual term			4 years
Unrecognized share-based compensation expense	$ 176.3		$ 176.3
2013 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Available for future grants (in shares)	15,958,460		15,958,460
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	$ 1.2		$ 1.2
Number of shares issued (in shares)	33,329
Share based compensation requisite service period recognition	4 months 24 days

Share-Based Compensation - Summ

Share-Based Compensation - Summary of Share-Based Compensation Expense Recognized to Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense	$ 24,916	$ 17,597	$ 44,314	$ 30,864
Cost of revenues
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense	2,120	1,301	3,761	2,311
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense	5,508	3,906	9,770	7,000
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense	9,799	7,189	17,407	12,230
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense	$ 7,489	$ 5,201	$ 13,376	$ 9,323

Share-Based Compensation - Su_2

Share-Based Compensation - Summary of Share-Based Compensation Expense by Award Type (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 24,916	$ 17,597	$ 44,314	$ 30,864
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	204	836	739	1,964
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	23,669	16,014	41,633	27,418
Employee stock purchase plan rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 1,043	$ 747	$ 1,942	$ 1,482

Share-Based Compensation - Su_3

Share-Based Compensation - Summary of Stock Option Activity Plans (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Number of Options Outstanding (in thousands)
Number of Options Outstanding, Beginning balance (in shares)			4,131,000
Number of Options Outstanding, Granted (in shares)	0	0	0	0
Number of Options Outstanding, Exercised (in shares)			(788,000)
Number of Options Outstanding, Canceled/Forfeited (in shares)			(125,000)
Number of Options Outstanding, Ending balance (in shares)	3,218,000		3,218,000		4,131,000
Number of Options Outstanding, Vested and expected to vest as of period end (in shares)	3,216,000		3,216,000
Number of Options Outstanding, Exercisable as of period end (in shares)	3,160,000		3,160,000
Weighted- Average Exercise Price Per Share
Weighted-Average Exercise Price, Beginning balance (USD per share)			$ 10.86
Weighted-Average Exercise Price, Granted (USD per share)			0
Weighted-Average Exercise Price, Exercised (USD per share)			7.78
Weighted-Average Exercise Price, Canceled/Forfeited (USD per share)			1.67
Weighted-Average Exercise Price, Ending balance (USD per share)	$ 11.97		11.97		$ 10.86
Weighted-Average Exercise Price, Outstanding (USD per share)	11.96		11.96
Weighted-Average Exercise Price, Exercisable (USD per share)	$ 11.86		$ 11.86
Weighted- Average Contractual Term (in Years)
Weighted-Average Contractual Term			2 years 10 months 24 days		3 years 3 months 18 days
Weighted-Average Contractual Term, Vested and expected to vest as of period end			2 years 10 months 24 days
Weighted-Average Contractual Term, Exercisable as of period end			2 years 10 months 24 days
Aggregate Intrinsic Value (in thousands)
Aggregate Intrinsic Value	$ 331,569		$ 331,569		$ 295,921
Weighted-Average Exercise Price, Vested and expected to vest as of period end	331,165		331,165
Weighted-Average Exercise Price, Exercisable as of period end	$ 325,619		$ 325,619

Share-Based Compensation - Su_4

Share-Based Compensation - Summary of RSUs Activity (Detail) - Restricted stock units $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)$ / sharesshares
Number of RSUs Outstanding (in thousands)
Number of RSUs Outstanding, Beginning Balance (in shares) | shares	3,561
Number of RSUs Outstanding, Granted (in shares) | shares	1,334
Number of RSUs Outstanding, Released (in shares) | shares	(975)
Number of RSUs Outstanding, Canceled/Forfeited (in shares) | shares	(175)
Number of RSUs Outstanding, Ending Balance (in shares) | shares	3,745
Weighted- Average Grant Date Fair Value Per Share
Weighted-Average Grant Date Fair Value Per Share, Beginning Balance (USD per share) | $ / shares	$ 42.09
Weighted-Average Grant Date Fair Value Per Share, Granted (USD per share) | $ / shares	110.04
Weighted-Average Grant Date Fair Value Per Share, Released (USD per share) | $ / shares	45.13
Weighted-Average Grant Date Fair Value Per Share, Canceled/Forfeited (USD per share) | $ / shares	56.38
Weighted-Average Grant Date Fair Value Per Share, Ending Balance (USD per share) | $ / shares	$ 64.96
Aggregate Intrinsic Value (in thousands)
Aggregate Intrinsic Value, Beginning Balance (amount) | $	$ 293,523
Aggregate Intrinsic Value, Outstanding, Ending Balance (amount) | $	$ 430,473

Segment Reporting - Additional

Segment Reporting - Additional Information (Detail) - Segment	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Concentration Risk [Line Items]
Number of reporting segment	1
Minimum | U.S. | Long-lived Assets | Geographic Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	76.00%	67.00%
Minimum | FRANCE | Long-lived Assets | Geographic Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	17.00%	26.00%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Provision for (benefit from) income taxes	$ 116	$ 139	$ (2,970)	$ 166
One time tax benefit from business acquisition			$ 3,200

Basic and Diluted Net Loss Pe_3

Basic and Diluted Net Loss Per Share 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				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator
Net loss	$ (9,243)	$ (6,358)	$ (8,291)	$ (2,716)	$ (15,601)	$ (11,007)
Denominator:
Weighted-average common shares outstanding for basic and diluted net loss per share	82,339		79,089		81,872	78,717
Basic and diluted net loss per share (in USD per share)	$ (0.11)		$ (0.10)		$ (0.19)	$ (0.14)

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 (Detail) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares excluded from diluted net loss per share	8,949	9,478	8,692	9,403
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	7,292	9,478	7,381	9,403
Convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares excluded from diluted net loss per share	1,657	0	1,311	0

Basic and Diluted Net Loss Pe_5

Basic and Diluted Net Loss Per Share - Additional Information (Detail)	Jun. 30, 2019$ / shares
Convertible senior notes
Earnings Per Share [Line Items]
Conversion price per share (USD per share)	$ 81.45

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - Google Inc. - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Total payables to related party	$ 2.9		$ 2.9		$ 1.2
Total expenses incurred from related party	$ 4.8	$ 4.4	$ 9.4	$ 9.5