Summary of Significant Accounting Policies - Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2019
Right-of-use assets	$ 2,970	$ 3,449
Lease liabilities	3,042
ASC 842
Right-of-use assets	1,000	1,900
Lease liabilities	$ 1,000	$ 1,900	$ 1,400
Term of lease (in years)			3 years
Minimum
Term of lease (in years)	1 year
Maximum
Term of lease (in years)	4 years