Summary of Significant Accounting Policies - Leases (Details) - USD ($) $ in Thousands	Jan. 01, 2019	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Right-of-use assets		$ 3,449	$ 3,473
Lease liabilities		3,481
ASC 842
Lease, Practical Expedients, Package [true false]	true
Right-of-use assets	$ 3,800	1,900		$ 1,400
Lease liabilities	$ 4,700	$ 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)		5 years