Property and Equipment and Long-Lived Assets - Summary of Depreciation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Depreciation expense	$ 3,132	$ 2,287	$ 1,546
Cost of Revenue
Property Plant And Equipment [Line Items]
Depreciation expense	104	230	282
Sales and Marketing
Property Plant And Equipment [Line Items]
Depreciation expense	11	23	23
Operations and Support
Property Plant And Equipment [Line Items]
Depreciation expense	155	193	136
Product Development
Property Plant And Equipment [Line Items]
Depreciation expense	2,655	1,543	975
General and Administrative
Property Plant And Equipment [Line Items]
Depreciation expense	$ 207	$ 298	$ 130