Summary of Significant Accounting Policies - Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Summary of Significant Accounting Policies
Lease, Practical Expedients, Package [true false]	true
Operating lease right-of-use assets	$ 9,197	$ 11,356
Operating lease liabilities	12,656	15,254
Retained earnings	$ 143,173	$ 173,731