Description of Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Schedule of Activity in the Allowance for Doubtful Accounts

The activity in the allowance for doubtful accounts is as follows (amounts in thousands):

Year Ended December 31,	Beginning Balance		Additions Charged to Costs and Expenses		Deductions / Write-Offs		ASU 2016-13 (Topic 326) Adjustment		Ending Balance
2018	$	1,318	$	1,788	$	(830)	$	—	$	2,276
2019	$	2,276	$	2,159	$	(1,365)	$	—	$	3,070
2020	$	3,070	$	3,211	$	(1,666)	$	729	$	5,344

Schedule of Deferred Revenue by Revenue Source

The following table presents deferred revenue by revenue source (amounts in thousands):

	December 31,
	2020		2019
Hosted services – Business	$	86,144	$	82,892
Hosted services – Consumer	835		687
Professional services – Business	1,869		5,172
Total deferred revenue - short term	$	88,848	$	88,751
Hosted services – Business	$	—	$	—
Professional services – Business	409		438
Total deferred revenue - long term	$	409	$	438

Schedule of Disaggregated of Revenue

Disaggregated Revenue

    The following table presents the Company's revenues disaggregated by revenue source (amounts in thousands):

	December 31,
	2020		2019		2018
Revenue:
Hosted services – Business	$	286,588	$	225,705	$	197,474
Hosted services – Consumer	29,764		24,480		19,553
Professional services	50,268		41,424		32,811
Total revenue	$	366,620	$	291,609	$	249,838

Schedule of Revenue by Geographic Location

The following table presents the Company's revenues attributable to domestic and foreign operations for the years ended (amounts in thousands):

	December 31,
	2020		2019		2018
United States	$	230,557	$	170,815	$	146,702
Other Americas (1)	13,420		11,462		7,315
Total Americas	243,977		182,277		154,017
EMEA (2) (4)	83,326		78,301		71,318
APAC (3)	39,317		31,031		24,503
Total revenue	$	366,620	$	291,609	$	249,838

(1) Canada, Latin America and South America

(2) Europe, the Middle East and Africa (“EMEA”)

(3) Asia-Pacific (“APAC”)

(4) Includes revenue from the United Kingdom of $53.4 million, $50.4 million, and $46.5 million for the years ended December 31, 2020, 2019, and 2018, respectively. and from the Netherlands of $3.2 million, $10.0 million, and $8.7 million for the years ended December 31, 2020, 2019, and 2018, respectively.

Schedule of Receivables, Contract Acquisition Costs, and Deferred Revenue

The opening and closing balances of the Company's accounts receivable, unbilled receivables, and deferred revenues are as follows (amounts in thousands):

	Accounts Receivable (1)		Unbilled Receivable (1)		Contract Acquisition Costs (noncurrent)		Deferred Revenue (current)		Deferred Revenue (long term)
Opening Balance as of December 31, 2019	$	70,318	$	17,302	$	31,965	$	88,751	$	438
Increase (decrease), net	(8,517)		1,320		9,056		97		(29)
Ending Balance as of December 31, 2020	$	61,801	$	18,622	$	41,021	$	88,848	$	409