Revenue - Disaggregation of Revenue By Product (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Total revenues	$ 43,281	$ 32,768
Management and Advisory Fees
Disaggregation of Revenue [Line Items]
Total revenues	43,027	32,573
Subscriptions
Disaggregation of Revenue [Line Items]
Total revenues	162	177
Other Revenue
Disaggregation of Revenue [Line Items]
Total revenues	$ 92	$ 18