Vonage 10-Q 6 May 21 2021 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	001-32887
Entity Registrant Name	VONAGE HOLDINGS CORP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	11-3547680
Entity Address, Address Line One	23 Main Street
Entity Address, City or Town	Holmdel
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	07733
City Area Code	732
Local Phone Number	528-2600
Title of 12(b) Security	Common Stock, par value $0.001
Trading Symbol	VG
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		251,388,823
Amendment Flag	false
Entity Central Index Key	0001272830
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 51,623	$ 43,078
Accounts receivable, net of allowance of $8,094 and $8,878, respectively	111,584	116,304
Deferred customer acquisition costs, current portion	19,490	18,161
Prepaid expenses	37,133	32,131
Other current assets	3,615	6,230
Total current assets	223,445	215,904
Property and equipment, net of accumulated depreciation of $119,646 and $117,761, respectively	29,848	31,621
Operating lease right-of-use assets	35,745	29,330
Goodwill	620,585	624,328
Software, net of accumulated amortization of $116,855 and $111,642, respectively	88,827	80,638
Deferred customer acquisition costs	68,609	67,529
Restricted cash	2,213	1,919
Intangible assets, net of accumulated amortization of $283,659 and $275,346, respectively	192,113	204,267
Deferred tax assets	106,594	106,374
Other assets	34,762	33,926
Total assets	1,402,741	1,395,836
Current liabilities:
Accounts payable	31,324	17,464
Accrued expenses	154,706	158,080
Deferred revenue, current portion	60,030	65,506
Operating lease liabilities, current portion	10,562	11,554
Total current liabilities	256,622	252,604
Indebtedness under revolving credit facility	210,500	215,500
Convertible senior notes, net	294,444	290,784
Operating lease liabilities	38,349	31,019
Other liabilities	3,561	3,155
Total liabilities	803,476	793,062
Commitments and Contingencies (Note 9)
Stockholders’ Equity:
Common stock, par value 0.001 per share; 596,950 shares authorized at March 31, 2021, and December 31, 2020	327	324
Additional paid-in capital	1,571,025	1,554,574
Accumulated deficit	(667,597)	(667,221)
Treasury stock, at cost	(337,532)	(320,891)
Accumulated other comprehensive income	33,042	35,988
Total stockholders’ equity	599,265	602,774
Total liabilities and stockholders’ equity	$ 1,402,741	$ 1,395,836

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Accounts Receivable, Allowance for Credit Loss	$ 8,094	$ 8,878
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	119,646	117,761
Capitalized Computer Software, Accumulated Amortization	116,855	111,642
Finite-Lived Intangible Assets, Accumulated Amortization	$ 283,659	$ 275,346
Common stock, par value (usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	596,950,000	596,950,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Service, access and product revenues	$ 314,793	$ 283,077
USF revenues	18,107	14,380
Total revenues	332,900	297,457
Operating Expenses:
Service, access and product cost of revenues (excluding depreciation and amortization)	138,680	113,038
USF cost of revenues	18,107	14,380
Sales and marketing	81,474	85,621
Engineering and development	20,360	19,203
General and administrative	44,933	40,882
Depreciation and amortization	20,417	20,485
Total operating expenses	323,971	293,609
Income from operations	8,929	3,848
Other Income (Expense):
Interest expense	(7,298)	(8,082)
Other income (expense), net	174	229
Total other expense, net	(7,124)	(7,853)
Income (loss) before income taxes	1,805	(4,005)
Income tax (expense) benefit	(2,181)	250
Net loss	$ (376)	$ (3,755)
Loss per common share:
Basic and diluted	$ 0	$ (0.02)
Weighted-average common shares outstanding:
Basic and diluted	249,638	243,627

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive (Loss) / Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other comprehensive loss:
Net loss	$ (376)	$ (3,755)
Foreign currency translation adjustment, net of tax expense (benefit) of $1,293 and $(470), respectively	(2,946)	(23,627)
Unrealized loss on derivatives, net of tax benefit of $— and $(50), respectively	0	(418)
Total other comprehensive loss	(2,946)	(24,045)
Comprehensive loss	$ (3,322)	$ (27,800)

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive (Loss) / Income Condensed Consolidated Statements of Comprehensive (Loss) / Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustment, net of tax expense/(benefit)	$ 1,293	$ (470)
Unrealized gain on derivatives, net of tax expense/(benefit)	$ 0	$ (50)

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net loss	$ (376)	$ (3,755)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	9,614	6,331
Amortization of intangibles	10,803	14,154
Deferred income taxes	999	1,468
Amortization of deferred customer acquisition costs	4,762	3,661
Allowances for doubtful accounts	964	1,448
Amortization of financing costs and debt discount	3,863	3,656
(Gain) Loss on disposal of property and equipment	(7)	741
Share-based expense	14,566	11,116
Changes in derivatives	0	(133)
Changes in operating assets and liabilities:
Accounts receivable	737	2,361
Prepaid expenses and other current assets	(2,305)	(5,387)
Deferred customer acquisition costs	(7,187)	(9,042)
Accounts payable and accrued expenses	16,416	(25,459)
Deferred revenue	(4,821)	2,934
Other assets - deferred cloud computing implementation costs	(1,017)	(669)
Other assets and liabilities	307	(922)
Net cash provided by operating activities	47,318	2,503
Cash flows used in investing activities:
Capital expenditures	2,553	2,887
Purchase of intangible assets	62	75
Acquisition and development of software assets	13,865	10,273
Net cash used in investing activities	(16,480)	(13,235)
Cash flows provided by (used in) financing activities:
Payments for short and long-term debt	(5,000)	0
Proceeds from issuance of long-term debt	0	45,000
Employee taxes paid on withholding shares	(16,641)	(12,656)
Proceeds from exercise of stock options	622	155
Net cash (used in) provided by financing activities	(21,019)	32,499
Effect of exchange rate changes on cash	(980)	(2,290)
Net increase in cash, cash equivalents, and restricted cash	8,839	19,477
Cash, cash equivalents, and restricted cash, beginning of period	44,997	25,635
Cash, cash equivalents, and restricted cash, end of period	53,836	45,112
Interest	1,863	2,866
Income taxes	(3,965)	1,249
Acquisition of long-term assets included in accounts payable and accrued expenses	1,302	2,119
Share-based compensation capitalized in internally developed software costs	$ 1,266	$ 928

Condensed Consolidated Statem_5

Condensed Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Treasury Stock	Accumulated Other Comprehensive Income
Beginning Balance at Dec. 31, 2019	$ 567,062	$ 316	$ 1,494,469	$ (631,009)	$ (306,043)	$ 9,329
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises	155	4	151
Share-based expense	12,044		12,044
Employee taxes paid on withholding shares	(12,748)				(12,748)
Foreign currency translation adjustment	(23,627)					(23,627)
Unrealized (loss) gain on derivatives	(418)					(418)
Net loss	(3,755)			(3,755)
Ending Balance at Mar. 31, 2020	538,713	320	1,506,664	(634,764)	(318,791)	(14,716)
Beginning Balance at Dec. 31, 2020	602,774	324	1,554,574	(667,221)	(320,891)	35,988
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises	622	3	619
Share-based expense	15,832		15,832
Employee taxes paid on withholding shares	(16,641)				(16,641)
Foreign currency translation adjustment	(2,946)					(2,946)
Unrealized (loss) gain on derivatives	0
Net loss	(376)			(376)
Ending Balance at Mar. 31, 2021	$ 599,265	$ 327	$ 1,571,025	$ (667,597)	$ (337,532)	$ 33,042

Nature of Business

Nature of Business	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business	Nature of Business Nature of Operations Vonage Holdings Corp. (“Vonage”, “Company”, “we”, “our”, “us”) is incorporated as a Delaware corporation. At Vonage, our vision is to accelerate the world's ability to connect. We are observing a secular change in the way business is done, with a fundamental shift in how communications technologies are being leveraged in almost every industry. Through the Vonage Communications Platform, our strategy is to deliver a single leading cloud communications platform that powers our customers' and partners' global engagement solutions using our APIs, Unified Communications, and Contact Center innovations. We believe that the Vonage Communications Platform's products and services are well positioned to take advantage of emerging trends with sizable, growing total addressable markets as companies look to cloud-based communications solutions and API programming architectures as part of their digital transformation. Our strategic business is the Vonage Communications Platform which delivers a single leading cloud communications platform that powers our customers' and partners' global engagement solutions using our APIs, Unified Communications, and Contact Center innovations. The Vonage Communications Platform brings unique value to businesses by providing multiple communications channels - including video, voice, messaging, email, verification, and artificial intelligence - that integrate into the applications, products and workflows that our customers are already using. We believe this delivers both the power and the flexibility to our customers to address the growing need to transform their communications, connections and experiences for customers and enables the type of business continuity, remote work, and remote delivery of services that are now essential for team members. For our Consumer customers, we enable users to access and utilize our services and features, via their existing internet connections, including over 3G/4G, LTE, Cable, or DSL broadband networks. This technology enables us to offer our Consumer customers attractively priced voice and messaging services and other features around the world on a variety of devices. Our Consumer strategy is focused on the continued penetration of our core North American markets, which provide value in international long distance and target under-served segments. Customers in the United States represented 66% and 69% of our consolidated revenues for the three months ended March 31, 2021 and 2020, respectively, with the balance in Canada, the United Kingdom, China, Singapore, Netherlands, and other countries around the world. Unaudited Interim Financial Information The accompanying unaudited interim condensed consolidated financial statements and information have been prepared in accordance with accounting principles generally accepted in the United States and in accordance with the SEC's regulations for interim financial information and with the instructions for Form 10-Q. Accordingly, they do not include all of the information and disclosures required by accounting principles generally accepted in the United States for complete financial statements. In the opinion of management, these financial statements contain all normal and recurring adjustments considered necessary to present fairly the Company's financial position, results of operations, comprehensive income, cash flows, and stockholders’ equity for the periods presented. The results for the three months ended March 31, 2021 are not necessarily indicative of the results to be expected for the full year. These unaudited interim condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in our Annual Report on Form 10-K for the year ended December 31, 2020 filed with the Securities and Exchange Commission on February 19, 2021. Use of Estimates Our condensed consolidated financial statements and notes thereof are prepared in conformity with accounting principles generally accepted in the United States, which require management to make estimates and assumptions that affect the amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates, including uncertainty in the economic environment due to the ongoing outbreak of the novel coronavirus COVID-19. We base our estimates on historical experience, available market information, appropriate valuation methodologies, and on various other assumptions that we believe to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Estimates are used for such items as depreciable lives for long-lived assets including intangible assets, tax provisions, uncollectible accounts, and assets and liabilities assumed in business combinations, among others. In addition, estimates are used to test long-lived assets and goodwill for impairment. COVID-19 has created and may continue to create uncertainty in customer payments, reduced usage, and issuance of customer credits to distressed customers served by certain product lines. As of the date of our condensed consolidated financial statements, we are not aware of any specific event or circumstance that would require us to materially update our estimates or judgments. However, these estimates may change as new events occur and additional information is obtained, which may result in changes being recognized in our condensed consolidated financial statements in future periods. In particular and in light of the COVID-19 pandemic, the assumptions and estimates associated with collectability assessment of revenue and credit losses of accounts receivable may have a material impact our consolidated financial statements in future periods, depending on the continued duration or degree of the impact of the COVID-19 pandemic on the global economy. Reclassifications Reclassifications have been made to our condensed consolidated financial statements for the prior year periods to conform to classifications used in the current year periods. The reclassifications did not affect results of operations, net assets or cash flows.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Significant Accounting Policies	Summary of Significant Accounting Policies This footnote should be read in conjunction with the complete description of our significant accounting policies under Note 2, Summary of Significant Accounting Policies to the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2020. Service, Access, and Product Cost of Revenues Service, access, and product cost of revenues excludes depreciation and amortization expense of $13,647 and $9,609 for the three months ended March 31, 2021 and 2020, respectively. In addition, costs of goods sold included service, access, and product cost of revenues during the three months ended March 31, 2021 and 2020 were $2,579 and $3,676, respectively. Sales and Marketing Expenses We incurred advertising costs, which are included in sales and marketing of $9,657 and $9,460 for the three months ended March 31, 2021 and 2019, respectively. Fair Value of Financial Instruments Certain of the Company's other financial instruments, which include cash and cash equivalents, restricted cash, accounts receivable and accounts payable, approximate fair value due to their short-term nature and as such are classified as Level 1. We believe the fair value of our 2018 Credit Facility at March 31, 2021 and December 31, 2020 was approximately the same as its carrying amount as the facility bears interest at a variable rate indexed to current market conditions and is classified as Level 2 within the fair value hierarchy. As of March 31, 2021 and December 31, 2020, the fair value of the 1.75% convertible senior notes due 2024 (the “Convertible Senior Notes”) was approximately $361,156 and $373,373, respectively. The fair value was determined based on the quoted price for the Convertible Senior Notes in an inactive market on the last trading day of the reporting period and is classified as Level 2 in the fair value hierarchy. We account for financial assets using a framework that establishes a hierarchy that ranks the quality and reliability of the inputs, or assumptions, we use in the determination of fair value, and we classify financial assets and liabilities carried at fair value in one of the following three categories: • Level 1 - quoted prices (unadjusted) in active markets that are accessible at the measurement date for identical assets and liabilities. The fair value hierarchy gives the highest priority to Level 1 inputs. • Level 2 - observable prices that are based on inputs not quoted on active markets but corroborated by market data; and • Level 3 - unobservable inputs when there is little or no market data available, thereby requiring an entity to develop its own assumptions. The fair value hierarchy gives the lowest priority to Level 3 inputs. Supplemental Balance Sheet Information The following table provides a reconciliation of cash and cash equivalents and restricted cash reported within the consolidated balance sheets to amounts included in the consolidated statements of cash flows: As of March 31, As of December 31, 2021 2020 2020 2019 Cash and cash equivalents $ 51,623 $ 43,073 $ 43,078 $ 23,620 Restricted cash 2,213 2,039 1,919 2,015 Total cash, cash equivalents and restricted cash $ 53,836 $ 45,112 $ 44,997 $ 25,635 The following tables provides supplemental information of intangible assets and accrued expenses within the consolidated balance sheets: Intangible assets, net March 31, 2021 December 31, 2020 Gross Carrying Value Accumulated Amortization Net Carrying Value Gross Carrying Value Accumulated Amortization Net Carrying Value Customer relationships $ 281,019 $ (153,678) $ 127,341 $ 284,692 $ (150,094) $ 134,598 Developed technology 173,416 (109,239) 64,177 173,572 (104,468) 69,104 Patents and patent licenses 20,896 (20,301) 595 20,849 (20,284) 565 Trade names 441 (441) — 500 (500) — Total intangible assets $ 475,772 $ (283,659) $ 192,113 $ 479,613 $ (275,346) $ 204,267 Accrued expenses March 31, 2021 December 31, 2020 Compensation and related taxes and temporary labor $ 31,118 $ 43,580 Marketing 19,849 15,319 Taxes and fees 31,669 25,977 Telecommunications 48,572 52,975 Severance 1,674 3,594 Interest 2,408 847 Customer credits 3,393 4,738 Professional fees 2,754 1,953 Inventory 907 659 Other accruals 12,362 8,438 Accrued expenses $ 154,706 $ 158,080 In the second half of 2020, the Company initiated a business-wide optimization and alignment project to focus the Company's resources and drive stronger operational execution. In connection with this project, the Company incurred accrued severance costs of $1,294 during the three months ended March 31, 2021, related to further employee exits, which was included in general and administrative expense. Goodwill The Company's goodwill is derived primarily from the acquisitions of Vocalocity, Telesphere, iCore, Simple Signal, Nexmo, TokBox, and NewVoiceMedia which are included in the Company's Vonage Communications Platform segment. The following table provides a summary of the changes in the carrying amounts of goodwill: Balance at December 31, 2020 $ 624,328 Foreign currency translation adjustment (3,743) Balance at March 31, 2021 $ 620,585 Recent Accounting Pronouncements In August 2020, the FASB issued ASU 2020-06, " Debt - Debt with Conversion Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity's Own Equity" . This ASU simplifies the accounting for certain convertible instruments such that the embedded conversion features are no longer separated from the host contract for convertible instruments with conversion features that are not required to be accounted for as derivatives under ASC 815, or that do not result in substantial premiums accounted for as paid-in-capital. As a result, more convertible debt instruments will be accounted for as a single liability measured at its amortized cost. In addition, the ASU requires the use of the if-converted method to be applied to convertible instruments when calculating earnings per share. The ASU is effective for fiscal years beginning after December 15, 2021, including interim periods within those fiscal years, using either a modified retrospective or a full retrospective approach. Early adoption is permitted for fiscal years beginning after December 15, 2020. The Company is currently evaluating the impact of this standard on our consolidated financial statements.

Revenue Recognition

Revenue Recognition	3 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition The Company recognizes revenue in accordance with ASC Topic 606, Revenue from Contracts with Customers which is further described in Note 2, Summary of Significant Accounting Policies and Note 3, Revenue Recognition to the consolidated financial statements in our Annual Report on Form 10-K for the year ended December 31, 2020. Disaggregation of Revenue The following tables detail our revenue from customers disaggregated by primary geographical market and source of revenue. The tables also include a reconciliation of the disaggregated revenue for our Vonage Communications Platform, or VCP, and Consumer segments. Three Months Ended Three Months Ended March 31, 2021 March 31, 2020 VCP Consumer Total VCP Consumer Total Primary geographical markets Americas $ 150,072 $ 74,932 $ 225,004 $ 129,379 $ 84,573 $ 213,952 EMEA 62,835 2,514 65,349 49,217 2,631 51,848 APAC 42,547 — 42,547 31,657 — 31,657 $ 255,454 $ 77,446 $ 332,900 $ 210,253 $ 87,204 $ 297,457 Major Sources of Revenue Service revenues $ 240,442 $ 65,697 $ 306,139 $ 195,649 $ 77,243 $ 272,892 Access and product revenues 8,598 56 8,654 10,122 63 10,185 USF revenues 6,414 11,693 18,107 4,482 9,898 14,380 $ 255,454 $ 77,446 $ 332,900 $ 210,253 $ 87,204 $ 297,457 In addition, the Company recognizes service revenues from its customers through subscription services provided or through usage or pay-per-use type arrangements. During the three months ended March 31, 2021, the Company recognized $150,453 related to subscription services, $133,652 related to usage, and $48,795 related to other revenues such as USF, other regulatory fees, and credits. During the three months ended March 31, 2020, the Company recognized $156,455 related to subscription services, $93,047 related to usage, and $47,955 related to other revenues such as USF, other regulatory fees, and credits. Contract Assets and Liabilities The following table provides information about receivables and contract liabilities from contracts with customers: March 31, 2021 December 31, 2020 Receivables (1) $ 111,584 $ 116,304 Contract liabilities (2) 60,030 65,506 (1) Amounts included in accounts receivables on our condensed consolidated balance sheets. (2) Amounts included in deferred revenues on our condensed consolidated balance sheet. Our deferred revenue represents the advance consideration received from customers for subscription services and is predominantly recognized over the following month as transfer of control occurs. During the three months ended March 31, 2021 and March 31, 2020, the Company recognized revenue of $106,037 and $108,875, respectively, related to its contract liabilities. We expect to recognize $60,030 into revenue over the next twelve months related to our deferred revenue as of March 31, 2021. Remaining Performance Obligation Transaction price allocated to the remaining performance obligation represents contracted revenue that has not yet been recognized. The typical subscription term may range from 1 month to 3 years. Contracted revenue as of March 31, 2021 that has not yet been recognized was approximately $0.4 billion. This excludes contracts with an original expected length of less than one year. The Company expects to recognize the majority of its remaining performance obligation over the next 18 months. Contract Acquisition Costs We have various commission programs for internal sales personnel and channel partners that are incremental to the acquisition of customer contracts. These costs are recorded as deferred contract acquisition costs on the consolidated balance sheets which eligible employees and third parties may earn a commission on sales of services and products to customers. We expect that these commission fees are recoverable and, therefore, we have capitalized $88,099 and $85,690 as contract costs, net of accumulated amortization, as of March 31, 2021 and December 31, 2020, respectively, included within deferred customer acquisitions costs, current portion and deferred customer acquisition costs on our condensed consolidated balance sheets. Capitalized commission fees are amortized to sales and marketing expense over estimated customer life, which is 7 years for Vonage Communications Platform customers. The amounts amortized to sales and marketing expense were $4,762 and $3,661, respectively, for the three months ended March 31, 2021 and March 31, 2020, respectively. There were no impairment losses recognized in relation to the costs capitalized during the three months ended March 31, 2021 and 2020. In addition, the Company expenses sales commissions for commission plans related to customer arrangements deemed less than a year and for residuals and renewals.

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following table sets forth the computation for basic and diluted loss per share for the three months ended March 31, 2021 and 2020: Three Months Ended March 31, 2021 2020 Numerator Net loss $ (376) $ (3,755) Denominator Weighted average common shares outstanding for basic and diluted net loss per share 249,638 243,627 Basic and diluted loss per share Basic and diluted loss per share $ — $ (0.02) For the three months ended March 31, 2021 and 2020, the following were excluded from the calculation of diluted loss per common share because of their anti-dilutive effects: Three Months Ended March 31, 2021 2020 Restricted stock units 15,795 13,894 Stock options 1,387 4,878 17,182 18,772 As 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 $16.72 per share. The Company's Convertible Senior Notes are further described in Note 6, Long-Term Debt .

Incomes Taxes

Incomes Taxes	3 Months Ended
	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income Tax Disclosure	Income Taxes The income tax consisted of the following: Three Months Ended March 31, 2021 2020 Income (loss) before income taxes $ 1,805 $ (4,005) Income tax (expense) benefit (2,181) 250 Effective tax rate 120.8 % 6.2 % Generally, provisions for income taxes during interim reporting periods apply an estimate of the annual effective tax rate for the full year. The provision for income taxes will vary with levels of pre-tax income (loss) and non-deductible expenses, NOL valuation allowances and other permanent non-deductible charges which can cause the rate to fluctuate from quarter to quarter. An alternative approach may be recorded under a discrete method which applies actual adjustments for the period including specific permanent adjustments and geographic distribution of our pre-tax income (loss). The discrete method was determined to be the appropriate method for calculating the interim tax provision as using the estimated annual effective tax rate method would have produced an unreliable rate stemming from a marginal loss and large permanent adjustments. For the three months ended March 31, 2021, our effective tax rate was different than the statutory rate primarily due to an increase in permanent items related to limitations on executive compensation, the inclusion of foreign income in the U.S. due to foreign disregarded entities, and limitation on foreign losses. For the three months ended March 31, 2020, our effective tax rate was different than the statutory rate primarily due to the recognition of discrete period tax benefit of $2,115, which was recognized related to excess tax benefits on equity compensation. In addition, the Company’s actual effective tax rate for the current year has reduced the expected annual benefit as a result of permanent adjustments related to limitations on executive compensation deductibility and inclusion of income in the U.S. due to foreign disregarded entities. Uncertain Tax Positions The Company had uncertain tax benefits of $1,001 and $632 as of March 31, 2021 and December 31, 2020, respectively. The Company recognizes interest and penalties related to uncertain tax benefits in income tax expense. The Company incurred interest expense or penalties of $2 and $0, respectively, during the three months ended March 31, 2021 and March 31, 2020. The following table reconciles the total amounts of uncertain tax benefits: March 31, 2021 December 31, 2020 Balance as of January 1 $ 632 $ 914 Increase due to current year positions 375 114 Increase due to prior year positions 4 — Decrease due to settlements and payments — (173) Decrease due to lapse of applicable statute of limitations — (238) (Decrease) increase due to foreign currency fluctuation (10) 15 Uncertain tax benefits as of the end of the period $ 1,001 $ 632 Net Operating Loss Carry Forwards

Long-Term Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt This footnote should be read in conjunction with the complete description of our financing arrangements under Note 8, Long-Term Debt , to the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2020. The following table summarizes the Company's long-term debt as of March 31, 2021 and December 31, 2020: March 31, 2021 December 31, 2020 Revolving credit facility - due 2023 210,500 215,500 Convertible senior notes - due 2024 345,000 345,000 Long-term debt including current maturities 555,500 560,500 Less unamortized discount 45,441 48,702 Less debt issuance costs 5,115 5,514 Total long-term debt $ 504,944 $ 506,284 Convertible Senior Notes In June 2019, the Company issued $300.0 million aggregate principal amount of 1.75% convertible senior notes due 2024 in a private placement and an additional $45.0 million aggregate principal amount of such notes pursuant to the exercise in full of the over-allotment option of the initial purchasers (collectively, "Convertible Senior Notes"). The Convertible Senior Notes are the Company's senior unsecured obligations. The Convertible Senior Notes will mature on June 1, 2024, unless earlier redeemed, repurchased or converted. We may not redeem the notes prior to June 5, 2022. Each $1,000 principal amount of the Convertible Senior Notes is initially convertible into 59.8256 shares of the Company's common stock, which is equivalent to an initial conversion price of approximately $16.72 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 interest. In addition, upon the occurrence of a make-whole fundamental change or a redemption period, each as defined in the indenture setting forth the terms of the Convertible Senior Notes, the Company will, in certain circumstances, increase the conversion rate by a number of additional shares for a holder that elects to convert its Convertible Senior Notes in connection with such make-whole fundamental change or during the relevant redemption period. Prior to December 1, 2023, the notes will be convertible only upon satisfaction of certain conditions and during certain periods, and thereafter, at any time until the close of business on the second scheduled trading day immediately preceding the maturity date. We will satisfy any conversion election by paying or delivering, as the case may be, cash, shares of common stock or a combination of cash and shares of common stock. During the three months ended March 31, 2021, the conditions allowing holders of the Convertible Senior Notes to convert were not met. The net carrying amount of the liability component of the Convertible Senior Notes was as follows: March 31, 2021 Principal $ 345,000 Unamortized discount (45,441) Unamortized issuance cost (5,115) Net carrying amount $ 294,444 The following table sets forth the interest expense recognized related to the Convertible Senior Notes: Three Months Ended March 31, 2021 2020 Contractual interest expense $ 1,509 $ 1,509 Amortization of debt discount 3,261 3,054 Amortization of debt issuance costs 399 399 Total interest expense related to the Convertible Senior Notes $ 5,169 $ 4,962 In connection with the pricing of the Convertible Senior Notes and subsequently in connection with the exercise of the initial purchaser's option to purchase additional notes, the Company entered into privately negotiated capped call transactions with certain counterparties (the "Capped Calls"). The Capped Calls each have a strike price of $16.72 per share, subject to certain adjustments, which corresponds to the initial conversion price of the Convertible Senior Notes. The Capped Calls have initial cap prices of $23.46 per share, subject to certain adjustments. The Capped Calls are expected generally to reduce potential dilution to the Company's common stock upon any conversion of notes and/or offset any cash payments the Company is required to make in excess of the aggregate principal amount of converted notes, as the case may be, with such reduction and/or offset subject to a cap. The initial cap price of the Capped Call transactions was $23.46. 2018 Term Note and Revolving Credit Facility On July 31, 2018, the Company entered into the 2018 Credit Facility consisting of a $100 million senior secured term loan and a $500 million revolving credit facility. The co-borrowers under the 2018 Credit Facility are the Company and Vonage America Inc., the Company’s wholly owned subsidiary. Obligations under the 2018 Credit Facility are guaranteed, fully and unconditionally, by the Company’s other United States subsidiaries and are secured by substantially all of the assets of each borrower and each guarantor.

Leases

Leases	3 Months Ended
	Mar. 31, 2021
Leases [Abstract]
Lessee, Operating Leases	Leases The Company entered into various non-cancelable operating lease arrangements for certain of our existing office and telecommunications co-location space as well as operating leases for certain equipment. The operating leases expire at various times through 2028, some of which provide the Company options to extend the lease for terms up to 5 years beyond the original term. We are committed to pay a portion of the buildings’ operating expenses as required under the arrangements which we will separate as a non-lease component when readily determinable. The Company did not have any finance leases as of March 31, 2021 and December 31, 2020. The Company incurred operating lease expense of $2,558 and $2,965, respectively, during the three months ended March 31, 2021 and March 31, 2020, related to its operating leases. In addition, the Company received sub-lease income of $284 and $319, respectively, during the three months ended March 31, 2021 and March 31, 2020. Additionally, the remaining weighted average lease term for our operating leases was 5.03 years and the weighted average discount rate utilized to measure the Company's operating leases was 4.35% as of March 31, 2021. Supplemental cash flow related to the Company's operating leases is as follows: Three Months Ended March 31, 2021 March 31, 2020 Cash paid for amounts included in the measurement of lease liabilities $ 2,628 $ 4,139 Right-of-use assets obtained in exchange for lease obligations $ 8,431 $ 1,261 Maturities of operating lease liabilities as of March 31, 2021 and December 31, 2020 are as follows: March 31, 2021 December 31, 2020 2021 (1) $ 9,407 13,134 2022 10,975 9,645 2023 10,735 8,401 2024 6,817 4,148 2025 6,917 4,248 Thereafter 9,525 7,522 Total lease payments 54,376 47,098 Less imputed interest (5,465) (4,525) Total $ 48,911 $ 42,573 (1) Excluding three months ended March 31, 2021 for the period ended March 31, 2021.

Common Stock

Common Stock	3 Months Ended
	Mar. 31, 2021
Equity [Abstract]
Stockholders' Equity Note Disclosure	Common Stock As of March 31, 2021 and December 31, 2020, the Company had 596,950 shares of common stock authorized and had 9,782 shares available for grants under our share-based compensation programs as of March 31, 2021. For a detailed description of our share-based compensation programs refer to Note 11, Employee Stock Benefit Plans in the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2020. The following table reflects the changes in the Company's common stock issued and outstanding: For the Three Months Ended (in thousands) Issued Treasury Outstanding Balance at December 31, 2019 315,808 (72,959) 242,849 Shares issued under the 2015 Equity Incentive Plan 4,072 — 4,072 Employee taxes paid on withholding shares — (1,675) (1,675) Balance at March 31, 2020 319,880 (74,634) 245,246 Balance at December 31, 2020 323,815 (74,841) 248,974 Shares issued under the 2015 Equity Incentive Plan 3,612 — 3,612 Employee taxes paid on withholding shares — (1,316) (1,316) Balance at March 31, 2021 327,427 (76,157) 251,270

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Litigation From time to time we are subject to legal proceedings, claims and investigations relating to our business, including claims of alleged infringement of commercial, employment, intellectual property rights, and other matters. From time to time, we receive letters or other communications from third parties inviting us to obtain patent licenses that might be relevant to our business or alleging that our services infringe upon third-party patents or other intellectual property. In accordance with generally accepted accounting principles, we make a provision for a liability when it is both probable that a liability has been incurred and the amount of the loss or range of loss can be reasonably estimated. These provisions, if any, are reviewed at least quarterly and adjusted to reflect the impacts of negotiations, settlements, rulings, advice of legal counsel, and other information and events pertaining to a particular case. Litigation is inherently unpredictable. We believe that we have valid defenses with respect to the legal matters pending against us and are vigorously defending these matters. Given the uncertainty surrounding litigation and our inability to assess the likelihood of a favorable or unfavorable outcome in such matters and our inability to reasonably estimate the amount of loss or range of loss, it is possible that the resolution of one or more of these matters could have a material adverse effect on our condensed consolidated financial position, cash flows or results of operations. Regulation Telephony services are subject to a broad spectrum of state, federal and foreign regulations. Because of the uncertainty over whether VoIP should be treated as a telecommunications or information service, we have been involved in a substantial amount of state and federal regulatory activity. Implementation and interpretation of the existing laws and regulations is ongoing and is subject to litigation by various federal and state agencies and courts. Due to the uncertainty over the regulatory classification of VoIP service, there can be no assurance that we will not be subject to new regulations or existing regulations under new interpretations, and that such change would not introduce material additional costs to our business. The Company continues to monitor federal regulations relating to net neutrality, rural call completion issues, number slamming, 911 access, access to telecommunication equipment and services by persons with disabilities, caller ID services, number portability, unwanted calls to reassigned numbers, and robocalling. As we continue to expand globally, these types of regulations are likely to be similarly enacted and enforced by the local regulatory authorities.

Industry Segment and Geographic

Industry Segment and Geographic Information	3 Months Ended
	Mar. 31, 2021
Segment Reporting [Abstract]
Segment Reporting Disclosure	Industry Segment and Geographic Information ASC 280, Segment Reporting, establishes reporting standards for an enterprise's business segments and related disclosures about its products, services, geographic areas and major customers. Under ASC 280, the method for determining what information to report is based upon the way management organizes the reportable operating segments within the Company for making operating decisions and assessing financial performance. Our chief operating decision-maker reviews revenue and Adjusted EBITDA for each of our reportable operating segments. Beginning as of December 31, 2020, the Company includes Adjusted EBITDA as this is the measure management uses to evaluate the profitability of our reportable operating segments. The items excluded from Adjusted EBITDA are not separately evaluated for each reportable operating segment. The Company has recast data from prior years to reflect the change how the Company evaluates the profitability of its reportable operating segments to conform to the current year presentation. In addition, with the exception of goodwill and intangible assets, we do not identify or allocate our assets by the reportable operating segments as this information is not utilized by management to allocate resources or capital. Vonage Communications Platform The Vonage Communications Platform is our single enterprise cloud communications platform, offering our wide range of enterprise communications services and solutions including Communications APIs, Unified Communications, and Contact Center Communications. The Vonage Communications Platform brings unique value to businesses by providing multiple communications channels - video, voice, messaging, email and verification - that integrate into applications, products and workflows. This delivers both the power and the flexibility our customers need to disrupt their industries, and enables the type of business continuity, remote work, and remote delivery of services that are now essential for companies to work and serve customers from anywhere. Vonage products and services enable our business customers to fundamentally change how they engage with their customers and team members. We have a robust set of solutions and services that meet the needs of businesses of all sizes, from micro, to SMB through mid-market and enterprise. We provide customers with multiple deployment options designed to provide the reliability and quality of service they demand. Vonage solutions also integrate with today's leading business applications, CRM and productivity tools,, including Google’s G Suite, Zendesk, Salesforce’s Sales and Service Clouds, Microsoft Dynamics, ServiceNow, Oracle, and Clio among others, to drive internal communications and collaboration among team members and external engagement with customers. Consumer For our Consumer customers, we enable users to access and utilize our UCaaS services and features, via a single “identity,” either a number or user name, regardless of how they are connected to the Internet, including over 3G/4G, LTE, Cable, or DSL broadband networks. This technology enables us to offer our Consumer customers attractively priced voice and messaging services and other features around the world on a variety of devices. Information about our segment results for the three months ended March 31, 2021 and March 31, 2020 were as follows: Three Months Ended Service Revenue Revenue Adjusted EBITDA Depreciation and Amortization March 31, 2021 Vonage Communications Platform $ 240,442 $ 255,454 $ (1,846) $ 20,080 Consumer 65,697 77,446 50,013 337 Total Vonage $ 306,139 $ 332,900 $ 48,167 $ 20,417 March 31, 2020 Vonage Communications Platform $ 195,649 $ 210,253 $ (21,088) $ 19,198 Consumer 77,243 87,204 59,925 1,287 Total Vonage $ 272,892 $ 297,457 $ 38,837 $ 20,485 The Company uses Adjusted EBITDA as the measure of profit or loss for the evaluation of performance and allocation of resources of our reportable operating segments. Adjusted EBITDA is defined as net income or net loss attributable to Vonage before income tax expense or benefit, interest expense, depreciation and amortization, stock-based expense, amortization of costs to implement cloud computing arrangements, acquisition related transaction and integration costs, organizational transformation costs, restructuring activities, and other non-recurring items. Organizational transformation includes employee related exits including CEO succession, system change management, facility exit costs, and rebranding. Restructuring activities relate to the Company's business-wide optimization and alignment project initiated in 2020 which included employee related exits and further facility exit costs executed upon as part of the overall project. Other non-recurring items principally include certain litigation charges including defense costs and other non-recurring project costs such as the review of the Consumer business review and the business optimization project, both of which were initiated in 2020. This is also consistent with the measure used under our bank credit assessment. Our reconciliation of the aggregate amount of Adjusted EBITDA for our reportable segments to consolidated income before taxes is presented below: Three Months Ended March 31, 2021 2020 Adjusted EBITDA $ 48,167 $ 38,837 Interest expense (7,298) (8,082) Depreciation and amortization (20,417) (20,485) Amortization of costs to implement cloud computing arrangements (896) (609) Share-based expense (14,566) (11,116) Organizational transformation — (1,194) Restructuring activities (1,294) — Other non-recurring items (1,891) (1,356) Income (Loss) before taxes $ 1,805 $ (4,005) Information about our operations by geographic location is as follows: March 31, 2021 December 31, 2020 Long-lived assets: United States $ 635,595 $ 646,072 United Kingdom 294,600 293,457 Israel 1,178 1,325 $ 931,373 $ 940,854

- Summary of Significant Accoun

- Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Unaudited Interim Financial Information	Unaudited Interim Financial Information The accompanying unaudited interim condensed consolidated financial statements and information have been prepared in accordance with accounting principles generally accepted in the United States and in accordance with the SEC's regulations for interim financial information and with the instructions for Form 10-Q. Accordingly, they do not include all of the information and disclosures required by accounting principles generally accepted in the United States for complete financial statements. In the opinion of management, these financial statements contain all normal and recurring adjustments considered necessary to present fairly the Company's financial position, results of operations, comprehensive income, cash flows, and stockholders’ equity for the periods presented. The results for the three months ended March 31, 2021 are not necessarily indicative of the results to be expected for the full year. These unaudited interim condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in our Annual Report on Form 10-K for the year ended December 31, 2020 filed with the Securities and Exchange Commission on February 19, 2021.
Use of Estimates	Use of Estimates Our condensed consolidated financial statements and notes thereof are prepared in conformity with accounting principles generally accepted in the United States, which require management to make estimates and assumptions that affect the amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates, including uncertainty in the economic environment due to the ongoing outbreak of the novel coronavirus COVID-19.
Reclassifications	Reclassifications Reclassifications have been made to our condensed consolidated financial statements for the prior year periods to conform to classifications used in the current year periods. The reclassifications did not affect results of operations, net assets or cash flows.
Cost of Revenues	Service, Access, and Product Cost of Revenues Service, access, and product cost of revenues excludes depreciation and amortization expense of $13,647 and $9,609 for the three months ended March 31, 2021 and 2020, respectively. In addition, costs of goods sold included service, access, and product cost of revenues during the three months ended March 31, 2021 and 2020 were $2,579 and $3,676, respectively.
Sales and Marketing Expenses	Sales and Marketing Expenses We incurred advertising costs, which are included in sales and marketing of $9,657 and $9,460 for the three months ended March 31, 2021 and 2019, respectively.
Fair Value of Financial Instruments	Fair Value of Financial Instruments Certain of the Company's other financial instruments, which include cash and cash equivalents, restricted cash, accounts receivable and accounts payable, approximate fair value due to their short-term nature and as such are classified as Level 1. We believe the fair value of our 2018 Credit Facility at March 31, 2021 and December 31, 2020 was approximately the same as its carrying amount as the facility bears interest at a variable rate indexed to current market conditions and is classified as Level 2 within the fair value hierarchy. As of March 31, 2021 and December 31, 2020, the fair value of the 1.75% convertible senior notes due 2024 (the “Convertible Senior Notes”) was approximately $361,156 and $373,373, respectively. The fair value was determined based on the quoted price for the Convertible Senior Notes in an inactive market on the last trading day of the reporting period and is classified as Level 2 in the fair value hierarchy. We account for financial assets using a framework that establishes a hierarchy that ranks the quality and reliability of the inputs, or assumptions, we use in the determination of fair value, and we classify financial assets and liabilities carried at fair value in one of the following three categories: • Level 1 - quoted prices (unadjusted) in active markets that are accessible at the measurement date for identical assets and liabilities. The fair value hierarchy gives the highest priority to Level 1 inputs. • Level 2 - observable prices that are based on inputs not quoted on active markets but corroborated by market data; and • Level 3 - unobservable inputs when there is little or no market data available, thereby requiring an entity to develop its own assumptions. The fair value hierarchy gives the lowest priority to Level 3 inputs.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In August 2020, the FASB issued ASU 2020-06, " Debt - Debt with Conversion Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity's Own Equity" . This ASU simplifies the accounting for certain convertible instruments such that the embedded conversion features are no longer separated from the host contract for convertible instruments with conversion features that are not required to be accounted for as derivatives under ASC 815, or that do not result in substantial premiums accounted for as paid-in-capital. As a result, more convertible debt instruments will be accounted for as a single liability measured at its amortized cost. In addition, the ASU requires the use of the if-converted method to be applied to convertible instruments when calculating earnings per share. The ASU is effective for fiscal years beginning after December 15, 2021, including interim periods within those fiscal years, using either a modified retrospective or a full retrospective approach. Early adoption is permitted for fiscal years beginning after December 15, 2020. The Company is currently evaluating the impact of this standard on our consolidated financial statements.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Restrictions on Cash and Cash Equivalents	The following table provides a reconciliation of cash and cash equivalents and restricted cash reported within the consolidated balance sheets to amounts included in the consolidated statements of cash flows: As of March 31, As of December 31, 2021 2020 2020 2019 Cash and cash equivalents $ 51,623 $ 43,073 $ 43,078 $ 23,620 Restricted cash 2,213 2,039 1,919 2,015 Total cash, cash equivalents and restricted cash $ 53,836 $ 45,112 $ 44,997 $ 25,635
Schedule of Finite-Lived Intangible Assets	Intangible assets, net March 31, 2021 December 31, 2020 Gross Carrying Value Accumulated Amortization Net Carrying Value Gross Carrying Value Accumulated Amortization Net Carrying Value Customer relationships $ 281,019 $ (153,678) $ 127,341 $ 284,692 $ (150,094) $ 134,598 Developed technology 173,416 (109,239) 64,177 173,572 (104,468) 69,104 Patents and patent licenses 20,896 (20,301) 595 20,849 (20,284) 565 Trade names 441 (441) — 500 (500) — Total intangible assets $ 475,772 $ (283,659) $ 192,113 $ 479,613 $ (275,346) $ 204,267
Schedule of Accrued Liabilities	Accrued expenses March 31, 2021 December 31, 2020 Compensation and related taxes and temporary labor $ 31,118 $ 43,580 Marketing 19,849 15,319 Taxes and fees 31,669 25,977 Telecommunications 48,572 52,975 Severance 1,674 3,594 Interest 2,408 847 Customer credits 3,393 4,738 Professional fees 2,754 1,953 Inventory 907 659 Other accruals 12,362 8,438 Accrued expenses $ 154,706 $ 158,080
Schedule of Goodwill	The following table provides a summary of the changes in the carrying amounts of goodwill: Balance at December 31, 2020 $ 624,328 Foreign currency translation adjustment (3,743) Balance at March 31, 2021 $ 620,585

Revenue Recognition (Tables)

Revenue Recognition (Tables)	3 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following tables detail our revenue from customers disaggregated by primary geographical market and source of revenue. The tables also include a reconciliation of the disaggregated revenue for our Vonage Communications Platform, or VCP, and Consumer segments. Three Months Ended Three Months Ended March 31, 2021 March 31, 2020 VCP Consumer Total VCP Consumer Total Primary geographical markets Americas $ 150,072 $ 74,932 $ 225,004 $ 129,379 $ 84,573 $ 213,952 EMEA 62,835 2,514 65,349 49,217 2,631 51,848 APAC 42,547 — 42,547 31,657 — 31,657 $ 255,454 $ 77,446 $ 332,900 $ 210,253 $ 87,204 $ 297,457 Major Sources of Revenue Service revenues $ 240,442 $ 65,697 $ 306,139 $ 195,649 $ 77,243 $ 272,892 Access and product revenues 8,598 56 8,654 10,122 63 10,185 USF revenues 6,414 11,693 18,107 4,482 9,898 14,380 $ 255,454 $ 77,446 $ 332,900 $ 210,253 $ 87,204 $ 297,457
Contract with Customer, Asset and Liability	The following table provides information about receivables and contract liabilities from contracts with customers: March 31, 2021 December 31, 2020 Receivables (1) $ 111,584 $ 116,304 Contract liabilities (2) 60,030 65,506 (1) Amounts included in accounts receivables on our condensed consolidated balance sheets. (2) Amounts included in deferred revenues on our condensed consolidated balance sheet.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table sets forth the computation for basic and diluted loss per share for the three months ended March 31, 2021 and 2020: Three Months Ended March 31, 2021 2020 Numerator Net loss $ (376) $ (3,755) Denominator Weighted average common shares outstanding for basic and diluted net loss per share 249,638 243,627 Basic and diluted loss per share Basic and diluted loss per share $ — $ (0.02)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	For the three months ended March 31, 2021 and 2020, the following were excluded from the calculation of diluted loss per common share because of their anti-dilutive effects: Three Months Ended March 31, 2021 2020 Restricted stock units 15,795 13,894 Stock options 1,387 4,878 17,182 18,772

Incomes Taxes (Tables)

Incomes Taxes (Tables)	3 Months Ended
	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Schedule of Effective Income Tax Rate Reconciliation	The income tax consisted of the following: Three Months Ended March 31, 2021 2020 Income (loss) before income taxes $ 1,805 $ (4,005) Income tax (expense) benefit (2,181) 250 Effective tax rate 120.8 % 6.2 %
Schedule of Unrecognized Tax Benefits Roll Forward	The following table reconciles the total amounts of uncertain tax benefits: March 31, 2021 December 31, 2020 Balance as of January 1 $ 632 $ 914 Increase due to current year positions 375 114 Increase due to prior year positions 4 — Decrease due to settlements and payments — (173) Decrease due to lapse of applicable statute of limitations — (238) (Decrease) increase due to foreign currency fluctuation (10) 15 Uncertain tax benefits as of the end of the period $ 1,001 $ 632

- Long-Term Debt (Tables)

- Long-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Schedule of Long-Term Debt	The following table summarizes the Company's long-term debt as of March 31, 2021 and December 31, 2020: March 31, 2021 December 31, 2020 Revolving credit facility - due 2023 210,500 215,500 Convertible senior notes - due 2024 345,000 345,000 Long-term debt including current maturities 555,500 560,500 Less unamortized discount 45,441 48,702 Less debt issuance costs 5,115 5,514 Total long-term debt $ 504,944 $ 506,284
Schedule of Net Carrying Amount of Liability and Equity Components of Notes	The net carrying amount of the liability component of the Convertible Senior Notes was as follows: March 31, 2021 Principal $ 345,000 Unamortized discount (45,441) Unamortized issuance cost (5,115) Net carrying amount $ 294,444
Schedule of Interest Expense Recognized Related to Notes	The following table sets forth the interest expense recognized related to the Convertible Senior Notes: Three Months Ended March 31, 2021 2020 Contractual interest expense $ 1,509 $ 1,509 Amortization of debt discount 3,261 3,054 Amortization of debt issuance costs 399 399 Total interest expense related to the Convertible Senior Notes $ 5,169 $ 4,962

Leases - Leases (Tables)

Leases - Leases (Tables)	3 Months Ended
	Mar. 31, 2021
Leases [Abstract]
Supplemental Cash Flow - Operating Leases	Supplemental cash flow related to the Company's operating leases is as follows: Three Months Ended March 31, 2021 March 31, 2020 Cash paid for amounts included in the measurement of lease liabilities $ 2,628 $ 4,139 Right-of-use assets obtained in exchange for lease obligations $ 8,431 $ 1,261
Maturity of Lease Liabilities	Maturities of operating lease liabilities as of March 31, 2021 and December 31, 2020 are as follows: March 31, 2021 December 31, 2020 2021 (1) $ 9,407 13,134 2022 10,975 9,645 2023 10,735 8,401 2024 6,817 4,148 2025 6,917 4,248 Thereafter 9,525 7,522 Total lease payments 54,376 47,098 Less imputed interest (5,465) (4,525) Total $ 48,911 $ 42,573

Common Stock (Tables)

Common Stock (Tables)	3 Months Ended
	Mar. 31, 2021
Equity [Abstract]
Schedule of Stock by Class	The following table reflects the changes in the Company's common stock issued and outstanding: For the Three Months Ended (in thousands) Issued Treasury Outstanding Balance at December 31, 2019 315,808 (72,959) 242,849 Shares issued under the 2015 Equity Incentive Plan 4,072 — 4,072 Employee taxes paid on withholding shares — (1,675) (1,675) Balance at March 31, 2020 319,880 (74,634) 245,246 Balance at December 31, 2020 323,815 (74,841) 248,974 Shares issued under the 2015 Equity Incentive Plan 3,612 — 3,612 Employee taxes paid on withholding shares — (1,316) (1,316) Balance at March 31, 2021 327,427 (76,157) 251,270

Industry Segment and Geograph_2

Industry Segment and Geographic Information (Tables)	3 Months Ended
	Mar. 31, 2021
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	Information about our segment results for the three months ended March 31, 2021 and March 31, 2020 were as follows: Three Months Ended Service Revenue Revenue Adjusted EBITDA Depreciation and Amortization March 31, 2021 Vonage Communications Platform $ 240,442 $ 255,454 $ (1,846) $ 20,080 Consumer 65,697 77,446 50,013 337 Total Vonage $ 306,139 $ 332,900 $ 48,167 $ 20,417 March 31, 2020 Vonage Communications Platform $ 195,649 $ 210,253 $ (21,088) $ 19,198 Consumer 77,243 87,204 59,925 1,287 Total Vonage $ 272,892 $ 297,457 $ 38,837 $ 20,485
Reconciliation of Operating Profit (Loss) from Segments to Consolidated	Our reconciliation of the aggregate amount of Adjusted EBITDA for our reportable segments to consolidated income before taxes is presented below: Three Months Ended March 31, 2021 2020 Adjusted EBITDA $ 48,167 $ 38,837 Interest expense (7,298) (8,082) Depreciation and amortization (20,417) (20,485) Amortization of costs to implement cloud computing arrangements (896) (609) Share-based expense (14,566) (11,116) Organizational transformation — (1,194) Restructuring activities (1,294) — Other non-recurring items (1,891) (1,356) Income (Loss) before taxes $ 1,805 $ (4,005)
Long-lived Assets by Geographic Areas	Information about our operations by geographic location is as follows: March 31, 2021 December 31, 2020 Long-lived assets: United States $ 635,595 $ 646,072 United Kingdom 294,600 293,457 Israel 1,178 1,325 $ 931,373 $ 940,854

Nature of Business (Details)

Nature of Business (Details)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
United States
Concentration Risk [Line Items]
Customer representation of revenue, percentage	66.00%	69.00%

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Cost of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accounting Policies [Abstract]
Depreciation and amortization	$ 13,647	$ 9,609
Cost of Goods and Services Sold	$ 2,579	$ 3,676

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Sales and Marketing Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accounting Policies [Abstract]
Advertising costs	$ 9,657	$ 9,460

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Inputs, Level 2 | Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt, fair value disclosures	$ 361,156	$ 373,373

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Cash and cash equivalents	$ 51,623	$ 43,078	$ 43,073	$ 23,620
Restricted cash	2,213	1,919	2,039	2,015
Cash, cash equivalents, and restricted cash	$ 53,836	$ 44,997	$ 45,112	$ 25,635

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Intangible Assets, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 475,772	$ 479,613
Finite-Lived Intangible Assets, Accumulated Amortization	(283,659)	(275,346)
Total intangible assets	192,113	204,267
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	281,019	284,692
Finite-Lived Intangible Assets, Accumulated Amortization	(153,678)	(150,094)
Total intangible assets	127,341	134,598
Developed technology
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	173,416	173,572
Finite-Lived Intangible Assets, Accumulated Amortization	(109,239)	(104,468)
Total intangible assets	64,177	69,104
Patents and patent licenses
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	20,896	20,849
Finite-Lived Intangible Assets, Accumulated Amortization	(20,301)	(20,284)
Total intangible assets	595	565
Trade names
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	441	500
Finite-Lived Intangible Assets, Accumulated Amortization	(441)	(500)
Total intangible assets	$ 0	$ 0

Summary of Significant Accoun_8

Summary of Significant Accounting Policies - Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Compensation and related taxes and temporary labor	$ 31,118	$ 43,580
Marketing	19,849	15,319
Taxes and fees	31,669	25,977
Telecommunications	48,572	52,975
Severance	1,674	3,594
Interest	2,408	847
Customer credits	3,393	4,738
Professional fees	2,754	1,953
Inventory	907	659
Other accruals	12,362	8,438
Accrued expenses	$ 154,706	$ 158,080

Summary of Significant Accoun_9

Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
- Schedule of Goodwill [Abstract]
Goodwill	$ 620,585	$ 624,328
Goodwill, Foreign Currency Translation Gain (Loss)	$ 3,743

Summary of Significant Accou_10

Summary of Significant Accounting Policies - Narratives (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Jun. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost, Depreciation and Amortization	$ 13,647	$ 9,609
Cost of Goods and Services Sold	$ 2,579	$ 3,676
Interest rate, stated percentage	1.75%			1.75%
Severance Costs	$ 1,294
Fair value, measurements, recurring | Fair Value, Inputs, Level 2
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Convertible debt, fair value disclosures	$ 361,156		$ 373,373

Revenue Recognition Disaggregat

Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Total revenues	$ 332,900	$ 297,457
Vonage Communications Platform
Disaggregation of Revenue [Line Items]
Total revenues	255,454	210,253
Consumer Services
Disaggregation of Revenue [Line Items]
Total revenues	77,446	87,204
Service
Disaggregation of Revenue [Line Items]
Total revenues	306,139	272,892
Service | Vonage Communications Platform
Disaggregation of Revenue [Line Items]
Total revenues	240,442	195,649
Service | Consumer Services
Disaggregation of Revenue [Line Items]
Total revenues	65,697	77,243
Access and product revenues
Disaggregation of Revenue [Line Items]
Total revenues	8,654	10,185
Access and product revenues | Vonage Communications Platform
Disaggregation of Revenue [Line Items]
Total revenues	8,598	10,122
Access and product revenues | Consumer Services
Disaggregation of Revenue [Line Items]
Total revenues	56	63
USF [Member]
Disaggregation of Revenue [Line Items]
Total revenues	18,107	14,380
USF [Member] | Vonage Communications Platform
Disaggregation of Revenue [Line Items]
Total revenues	6,414	4,482
USF [Member] | Consumer Services
Disaggregation of Revenue [Line Items]
Total revenues	11,693	9,898
Americas
Disaggregation of Revenue [Line Items]
Total revenues	225,004	213,952
Americas | Vonage Communications Platform
Disaggregation of Revenue [Line Items]
Total revenues	150,072	129,379
Americas | Consumer Services
Disaggregation of Revenue [Line Items]
Total revenues	74,932	84,573
EMEA
Disaggregation of Revenue [Line Items]
Total revenues	65,349	51,848
EMEA | Vonage Communications Platform
Disaggregation of Revenue [Line Items]
Total revenues	62,835	49,217
EMEA | Consumer Services
Disaggregation of Revenue [Line Items]
Total revenues	2,514	2,631
Asia Pacific
Disaggregation of Revenue [Line Items]
Total revenues	42,547	31,657
Asia Pacific | Vonage Communications Platform
Disaggregation of Revenue [Line Items]
Total revenues	42,547	31,657
Asia Pacific | Consumer Services
Disaggregation of Revenue [Line Items]
Total revenues	$ 0	$ 0

Revenue Recognition - Contract

Revenue Recognition - Contract with Customer, Asset and Liability (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Receivables	$ 111,584	$ 116,304
Contract liabilities	$ 60,030	$ 65,506

Revenue Recognition - Performan

Revenue Recognition - Performance Obligation (Details) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 $ in Billions	Mar. 31, 2021USD ($)
Revenue from Contract with Customer [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 0.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	18 months

Revenue Recognition - Narrative

Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2022	Dec. 31, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 332,900	$ 297,457
Contract With Customer, Liability, Including New Contract Revenue, Recognized	106,037	108,875
Amortization of deferred customer acquisition costs	4,762	3,661
Scenario, Forecast
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Recognized revenue, contract liabilities			$ 60,030
Subscription services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	150,453	156,455
Usage
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	133,652	93,047
USF and others
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	48,795	47,955
Current and Non-Current Portion
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Customer acquisition cost	88,099			$ 85,690
Vonage Communications Platform
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 255,454	$ 210,253
Typical life of a customer	7 years
Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, Performance Obligation, Description of Timing	3
Minimum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, Performance Obligation, Description of Timing	1

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of Earnings Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator
Net loss	$ (376)	$ (3,755)
Denominator
Basic and diluted	249,638	243,627
Basic and diluted earnings per share [Abstract]
Basic and diluted	$ 0	$ (0.02)

Earnings Per Share - Schedule_2

Earnings Per Share - Schedule of Antidilutive Securities (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings per share, antidilutive securities:
Antidilutive securities excluded from earnings per common share (in shares)	17,182	18,772
Restricted stock units
Earnings per share, antidilutive securities:
Antidilutive securities excluded from earnings per common share (in shares)	15,795	13,894
Stock options
Earnings per share, antidilutive securities:
Antidilutive securities excluded from earnings per common share (in shares)	1,387	4,878

Earnings Per Share - Narrative

Earnings Per Share - Narrative (Details) - $ / shares	Mar. 31, 2021	Jun. 30, 2019
Earnings Per Share [Abstract]
Debt instrument, conversion price (in dollar per share)	$ 16.72	$ 16.72

Income Taxes - Effective Tax Ra

Income Taxes - Effective Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ 1,805	$ (4,005)
Income tax (expense) benefit	$ (2,181)	$ 250
Effective tax rate	120.80%	6.20%

Income Taxes - Schedule of Unre

Income Taxes - Schedule of Unrecognized Tax Benefit Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance as of January 1	$ 632	$ 914
Increase due to current year positions	375	114
Increase due to prior year positions	(4)	0
Decrease due to settlements and payments	0	(173)
Decrease due to lapse of applicable statute of limitations	0	(238)
(Decrease) increase due to foreign currency fluctuation	(10)	$ 15
Uncertain tax benefits as of the end of the period	$ 1,001

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Discrete period tax benefit	$ 2,115
Uncertain tax position		$ 1,001	$ 632	$ 914
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		410,731
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		207,769
Foreign Tax Authority | Her Majesty's Revenue and Customs (HMRC)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		$ 159,152

Long-Term Debt - Schedule of Lo

Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Revolving credit facility - due 2023	$ 210,500	$ 215,500
Convertible senior notes - due 2024	345,000	345,000
Long-term debt including current maturities	555,500	560,500
Less unamortized discount	45,441	48,702
Less debt issuance costs	5,115	5,514
Total long-term debt	$ 504,944	$ 506,284

Long-Term Debt - Schedule of Ne

Long-Term Debt - Schedule of Net Carrying Amount of Liability Component of Notes (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2019	Jul. 31, 2018
Debt Disclosure [Abstract]
Principal	$ 345,000		$ 300,000	$ 100,000
Unamortized discount	(45,441)
Unamortized issuance cost	(5,115)	$ (5,514)
Net carrying amount	$ 294,444

Long-Term Debt - Schedule of In

Long-Term Debt - Schedule of Interest Expense Recognized Related to Notes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Debt Disclosure [Abstract]
Contractual interest expense	$ 1,509	$ 1,509
Amortization of debt discount	3,261	3,054
Amortization of debt issuance costs	399	399
Total interest expense related to the Convertible Senior Notes	$ 5,169	$ 4,962

Long-Term Debt - Narrative (Det

Long-Term Debt - Narrative (Details) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended
	Jun. 30, 2019USD ($)$ / shares$ / unitshares	Mar. 31, 2021USD ($)$ / shares	Mar. 31, 2020USD ($)	Jul. 31, 2018USD ($)
Debt Instrument [Line Items]
Principal	$ 300,000	$ 345,000		$ 100,000
Interest rate, stated percentage	1.75%	1.75%
Additional principal amount	$ 45,000
Converted instrument, amount	$ 1,000
Converted shares issued (in shares) | shares	59.8256
Debt instrument, conversion price (in dollar per share) | $ / shares	$ 16.72	$ 16.72
Derivative, cap price (in dollars per share) | $ / unit	23.46
Line of credit, maximum borrowing capacity				$ 500,000
Principal payments on notes and revolving credit facility		$ 5,000	$ 0
Proceeds from issuance of long-term debt		$ 0	45,000
Line of credit facility, interest rate at period end		2.88%
Line of credit
Debt Instrument [Line Items]
Principal payments on notes and revolving credit facility		$ 5,000
Proceeds from issuance of long-term debt			$ 45,000

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow - Operating Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Cash paid for amounts included in the measurement of lease liabilities	$ 2,628	$ 4,139
Right-of-use assets obtained in exchange for operating lease liability	$ 8,431	$ 1,261

Leases - Lessee, Operating Leas

Leases - Lessee, Operating Lease, Liability, Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Leases [Abstract]
2021 (1)	$ 9,407	$ 13,134
2022	10,975	9,645
2023	10,735	8,401
2024	6,817	4,148
2025	6,917	4,248
Thereafter	9,525	7,522
Total lease payments	54,376	47,098
Less imputed interest	(5,465)	(4,525)
Total	$ 48,911	$ 42,573

Leases - Narratives (Details)

Leases - Narratives (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Leases [Abstract]
Modificationofoperatingleaseliability			$ 15,825
Operating lease, expense	$ 2,558	$ 2,965
Operating Leases, Income Statement, Sublease Revenue	$ 284	$ 319
Operating lease, weighted average remaining lease term	5 years 10 days
Operating lease, discount rate	4.35%
Operating Lease, Right-of-Use Asset, Amortization Expense			$ 9,503

Common Stock Schedule of Stock

Common Stock Schedule of Stock by Class (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Outstanding, Balance at beginning of period (in shares)	248,974	242,849
Shares issued under the 2015 Equity Incentive Plan (in shares)	3,612	4,072
Employee taxes paid on withholding shares (in shares)	1,316	1,675
Outstanding, Balance at end of period (in shares)	251,270	245,246
Common Stock Issued
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issued, Balance at beginning of period (in shares)	323,815	315,808
Shares issued under the 2015 Equity Incentive Plan (in shares)	3,612	4,072
Employee taxes paid on withholding shares (in shares)	0	0
Issued, Balance at end of period (in shares)	327,427	319,880
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury, Balance at beginning of period (in shares)	74,841	72,959
Shares issued under the 2015 Equity Incentive Plan (in shares)	0	0
Employee taxes paid on withholding shares (in shares)	1,316	1,675
Treasury, Balance at end of period (in shares)	76,157	74,634

Common Stock - Narrative (Detai

Common Stock - Narrative (Details) - shares	Mar. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	596,950,000	596,950,000
Shares available for grant (in shares)	9,782

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Reserve for potential tax liability pending new requirements from state or municipal agencies	$ 8,648	$ 8,560

Industry Segment and Geograph_3

Industry Segment and Geographic Information - Schedule of Segment Results (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Total revenues	$ 332,900	$ 297,457
Adjusted EBITDA	48,167	38,837
Depreciation, Depletion And Amortization Including Impairment Charges	20,417	20,485
Vonage Communications Platform
Segment Reporting Information [Line Items]
Total revenues	255,454	210,253
Adjusted EBITDA	(1,846)	(21,088)
Depreciation, Depletion And Amortization Including Impairment Charges	20,080	19,198
Consumer Services
Segment Reporting Information [Line Items]
Total revenues	77,446	87,204
Adjusted EBITDA	50,013	59,925
Depreciation, Depletion And Amortization Including Impairment Charges	337	1,287
Service
Segment Reporting Information [Line Items]
Total revenues	306,139	272,892
Service | Vonage Communications Platform
Segment Reporting Information [Line Items]
Total revenues	240,442	195,649
Service | Consumer Services
Segment Reporting Information [Line Items]
Total revenues	$ 65,697	$ 77,243

Industry Segment and Geograph_4

Industry Segment and Geographic Information - Reconciliation of the Reportable Segments' Gross Margin (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting [Abstract]
Adjusted EBITDA	$ 48,167	$ 38,837
Interest expense	(7,298)	(8,082)
Depreciation and amortization	(20,417)	(20,485)
Amortization of costs to implement cloud computing arrangements	(896)	(609)
Share-based expense	(14,566)	(11,116)
Organizational transformation	0	(1,194)
Restructuring activities	(1,294)	0
Other non-recurring items	(1,891)	(1,356)
Income (loss) before income taxes	$ 1,805	$ (4,005)

Industry Segment and Geograph_5

Industry Segment and Geographic Information - Schedule of Long Lived Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Long-lived assets	$ 931,373	$ 940,854
United States
Segment Reporting Information [Line Items]
Long-lived assets	635,595	646,072
United Kingdom
Segment Reporting Information [Line Items]
Long-lived assets	294,600	293,457
Israel
Segment Reporting Information [Line Items]
Long-lived assets	$ 1,178	$ 1,325