Summary of Significant Accounting Policies - Summary of reconciliation of shares used to determine net loss per share (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Summary of Significant Accounting Policies
Net income (loss)	$ 11,277	$ 2,386	$ 10,201	$ (499)
Weighted average number of shares - basic	43,498,908	42,628,560	43,426,463	42,628,560
Shares underlying options	2,919,899	289,002	2,418,082
Weighted average number of shares - diluted	46,418,807	42,917,562	45,844,545	42,628,560