Summary of Significant Accounting Policies - Reconciliation of shares used to determine net income per share (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Summary of Significant Accounting Policies
Net income	$ 29,356	$ 15,870	$ 98,721	$ 26,071
Weighted average number of shares - basic	45,063,810	43,870,825	44,935,739	43,576,211
Shares underlying options	2,117,614	3,093,697	2,117,271	2,836,480
Weighted average number of shares - diluted	47,181,424	46,964,522	47,053,010	46,412,691