Significant Accounting Policies - Summary of Funds Held from Customers and Customer Fund Obligations Held by Company and by Customer Trust (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Funds held from customers (current assets):
Funds held from customers	$ 64,359	$ 62,509
Customer fund obligations (current liabilities):
Customer fund obligations	66,368	64,302
Company
Customer fund obligations (current liabilities):
Customer fund obligations	66,368	64,302
Restricted Cash Equivalents | Company
Funds held from customers (current assets):
Funds held from customers	647	13
Restricted Cash Equivalents | Customer Trust
Funds held from customers (current assets):
Funds held from customers	63,353	62,126
Available-for-sale Securities | Customer Trust
Funds held from customers (current assets):
Funds held from customers	$ 359	$ 370