Significant Accounting Policies - Change in Previously Reported Line Items in the Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Change in customer funds payable	$ 1,617	$ (202)	$ 3,505
Net cash provided by financing activities	287,115	14,954	22,773
Net increase in cash, cash equivalents, and restricted cash	173,966	12,981	4,846
Cash, cash equivalents, and restricted cash, beginning of period	38,843	25,862	21,016
Cash, cash equivalents, and restricted cash, end of period	212,809	38,843	25,862
Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Change in customer funds payable		0	0
Net cash provided by financing activities		15,156	19,268
Net increase in cash, cash equivalents, and restricted cash		13,183	1,341
Cash, cash equivalents, and restricted cash, beginning of period	17,919	4,736	3,395
Cash, cash equivalents, and restricted cash, end of period		17,919	4,736
Revision of Prior Period, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Change in customer funds payable		(202)	3,505
Net cash provided by financing activities		(202)	3,505
Net increase in cash, cash equivalents, and restricted cash		(202)	3,505
Cash, cash equivalents, and restricted cash, beginning of period	$ 20,924	21,126	17,621
Cash, cash equivalents, and restricted cash, end of period		$ 20,924	$ 21,126