Commitments and Contingencies - Components of Lease Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Components of Lease Costs
Finance lease, amortization of right-of-use assets	$ 772	$ 0
Finance lease, interest	88	0
Operating lease cost	12,649	12,984
Total lease cost	$ 13,509	$ 12,984