Share-Based Compensation Expense - Schedule of stock option award activity (Details)	6 Months Ended
	Jun. 30, 2022 $ / shares shares
Shares
Outstanding, beginning balance (in shares) | shares	9,737,292
Granted (in shares) | shares	22,304
Exercised (in shares) | shares	(1,747,085)
Cancelled or forfeited (in shares) | shares	(839,903)
Outstanding, ending balance (in shares) | shares	7,172,608
Exercisable (in shares) | shares	5,992,802
Weighted Average Exercise Price
Outstanding, beginning balance (in usd per share) | $ / shares	$ 1.40
Granted (in usd per share) | $ / shares	1.95
Exercised (in usd per share) | $ / shares	0.24
Cancelled or forfeited (in usd per share) | $ / shares	3.73
Outstanding, ending balance (in usd per share) | $ / shares	1.39
Exercisable (in usd per share) | $ / shares	$ 0.73
Weighted Average Remaining Contractual Term, Beginning balance	7 years 2 months 12 days
Weighted Average Remaining Contractual Term, Exercisable	6 years 7 months 6 days
Weighted Average Remaining Contractual Term, Ending balance	6 years 10 months 24 days