Stock Based Compensation - Restricted stock units (Details) - RSUs $ / shares in Units, $ in Thousands	6 Months Ended	103 Months Ended
	Jun. 30, 2022 USD ($) $ / shares shares	Jun. 30, 2022 USD ($) $ / shares shares
Stock-based compensation
Beginning balance | shares	826,148
Granted | shares	763,830	1,888,317
Vested | shares	(152,908)
Forfeited | shares	(60,950)
Ending balance | shares	1,376,120	1,376,120
Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares	$ 37.79
Weighted Average Grant Date Fair Value, Granted | $ / shares	29.71
Weighted Average Grant Date Fair Value, Vested | $ / shares	37.82
Weighted Average Grant Date Fair Value, Forfeited | $ / shares	34.81
Weighted Average Grant Date Fair Value, Ending Balance | $ / shares	$ 33.43	$ 33.43
Compensation expense
Unamortized compensation expense related to unvested restricted stock units | $	$ 36,900	$ 36,900
Period to recognize unamortized compensation expense	2 years 2 months 12 days