Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue from fees, net	$ 179,348	$ 210,421	$ 751,675	$ 513,888
Platform and referral fees, net
Disaggregation of Revenue [Line Items]
Revenue from fees, net	134,786	191,442	618,208	467,476
Servicing and other fees, net
Disaggregation of Revenue [Line Items]
Revenue from fees, net	$ 44,562	$ 18,979	$ 133,467	$ 46,412