Leases - (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) ft² Lease	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Leases [Abstract]
Number of operating leases | Lease	4
Area under lease | ft²	134,296
Operating lease cost	$ 5,354	$ 6,004
Amortization of right-of-use assets	138	0
Interest on lease liabilities	16	0
Total lease cost	$ 5,508	$ 6,004
Rent expense			$ 4,900