Summary of Significant Accounting Policies - Summary of reconciliation of shares used to determine net loss per share (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Summary of Significant Accounting Policies
Net income (loss)	$ 15,870	$ 39	$ 26,071	$ (460)
Weighted average number of shares - basic	43,870,825	42,656,510	43,576,211	42,637,945
Weighted average number of shares - diluted	46,964,522	43,680,265	46,412,691	42,637,945