Summary of Significant Accounting Policies - Adoption of ASC 842 (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, liability	$ 6,008
Right of use assets - operating leases	3,933	$ 6,704	$ 8,289
Operating lease liability, current	2,490	2,198	2,245
Operating lease liability, long term	$ 3,518	$ 4,581	6,044
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, liability			8,300
Right of use assets - operating leases			8,300
ASC 842 Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right of use assets - operating leases			8,289
Operating lease liability, current			2,245
Operating lease liability, long term			$ 6,044