Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue from fees, net	$ 258,345	$ 187,297	$ 572,327	$ 303,467
Platform and referral fees, net
Disaggregation of Revenue [Line Items]
Revenue from fees, net	211,610	169,080	483,422	276,033
Servicing and other fees, net
Disaggregation of Revenue [Line Items]
Revenue from fees, net	$ 46,735	$ 18,217	$ 88,905	$ 27,434