Description of Business and Summary of Significant Accounting Policies - Revenue by Geographic Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Total revenue	$ 366,620	$ 291,609	$ 249,838
United States
Disaggregation of Revenue [Line Items]
Total revenue	230,557	170,815	146,702
Other Americas
Disaggregation of Revenue [Line Items]
Total revenue	13,420	11,462	7,315
Total Americas
Disaggregation of Revenue [Line Items]
Total revenue	243,977	182,277	154,017
EMEA
Disaggregation of Revenue [Line Items]
Total revenue	83,326	78,301	71,318
APAC
Disaggregation of Revenue [Line Items]
Total revenue	39,317	31,031	24,503
United Kingdom
Disaggregation of Revenue [Line Items]
Total revenue	53,400	50,400	46,500
Netherlands
Disaggregation of Revenue [Line Items]
Total revenue	$ 3,200	$ 10,000	$ 8,700