Segment and Geographic Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of operating segments | segment	1
Total revenue	$ 188,001	$ 124,875	$ 92,109
Property and equipment, net	8,270	2,968
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	85,642	57,231	42,159
Property and equipment, net	6,409	1,023
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	19,625	13,158	10,187
Russia
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	1,406	1,450
Czech Republic
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	408	439
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	82,734	54,486	$ 39,763
Property and equipment, net	$ 47	$ 56