Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue from fees, net	$ 907,272	$ 801,275	$ 228,600
Platform and referral fees, net
Disaggregation of Revenue [Line Items]
Revenue from fees, net	732,237	726,161	200,257
Servicing and other fees, net
Disaggregation of Revenue [Line Items]
Revenue from fees, net	$ 175,035	$ 75,114	$ 28,343