Share-Based Compensation - Stock option activity (Details) - Stock options - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Number of shares
Balance at the beginning (in shares)	6,921,180	8,683,952
Granted (in shares)	1,385,108	407,903
Exercise (in shares)	0	0
Forfeited (in shares)	(190,621)	(385,697)
Expired (in shares)	(526)	0
Balance at the end (in shares)	8,115,141	8,706,158
Vested options exercisable at the end (in shares)	1,858,885	1,014,914
Weighted average exercise price
Balance at the beginning (in dollars per share)	$ 0.88	$ 0.85
Granted (in dollars per share)	7.09	0.86
Exercised (in dollars per share)	0	0
Forfeited (in dollars per share)	1.23	0.86
Expired (in dollars per share)		0
Balance at the end (in dollars per share)	1.94	0.85
Vested options exercisable at the end (in dollars per share)	$ 0.86	$ 0.85
Weighted average remaining contractual term and aggregate intrinsic value
Balance at the end (in years)	8 years 10 months 13 days	8 years 8 months 23 days
Vested options exercisable at the end (in years)	7 years 6 months 29 days	8 years 1 month 24 days
Aggregate intrinsic value (in thousands)	$ 42,151	$ 80
Vested Options Exercisable	$ 11,662	$ 0