Leases - Additional Information (Details) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($) lease	Mar. 31, 2020 USD ($) lease	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($) lease	Dec. 31, 2020 USD ($)	May 01, 2020 USD ($)
Operating Leased Assets [Line Items]
Operating right of use assets	$ 12,423			$ 12,423		$ 7,117	$ 7,200
Operating lease liability	12,470			12,470		$ 7,200	$ 7,200
Fair value of annual operating lease payments	700			700
Lease payments	$ 464	$ 293		$ 783	$ 846
Weighted-average remaining lease term (in years)	9 years 1 month 6 days	10 years 1 month 6 days		9 years 1 month 6 days	10 years 1 month 6 days
Average discount rate (as a percent)	4.10%	5.70%		4.10%	5.70%
Gain on settlement				$ 0	$ 802
Terminated and Vacated Lease
Operating Leased Assets [Line Items]
Operating lease liability		$ 900			$ 900
Number of leases | lease			1
Impairment loss			$ 900
Gain on settlement		$ 800
Notes Payable, Other Payables | Lease Settlement Payable
Operating Leased Assets [Line Items]
Interest rate		4.00%			4.00%
Notes payable		$ 100			$ 100
New York City Headquarter
Operating Leased Assets [Line Items]
Operating lease liability		$ 5,800			$ 5,800
Number of leases | lease		2			2
Impairment loss		$ 5,300