Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating lease assets and liabilities
Operating lease right-of-use assets	$ 6,566	$ 1,927
Operating lease liabilities	$ 6,985
ASU 2016-02 | Cumulative Effect Adjustment
Operating lease assets and liabilities
Operating lease right-of-use assets			$ 3,682
Operating lease liabilities			$ 3,917