SETTLEMENT ASSETS AND CUSTOMER ACCOUNT BALANCES AND RELATED OBLIGATIONS - Schedule of Settlement Assets and Obligations (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Settlement Assets:
Settlement assets and customer account balances	$ 498,616	$ 479,471
Settlement Obligations:
Settlement and customer account obligations	503,731	500,291
Customer account obligations
Settlement Obligations:
Settlement and customer account obligations	497,388	478,935
Due to customer payees
Settlement Obligations:
Settlement and customer account obligations	6,343	21,356
Card settlements due from merchants, net of estimated losses
Settlement Assets:
Settlement assets and customer account balances	1,228	537
Cash and cash equivalents
Settlement Assets:
Settlement assets and customer account balances	497,388	468,934
Time deposits
Settlement Assets:
Settlement assets and customer account balances	$ 0	$ 10,000