Stock-Based Compensation - Restricted stock units activity (Details) - Unvested restricted stock units - $ / shares	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Number of Shares
Outstanding, beginning balance (in shares)	7,501,945
Granted (in shares)	7,917,033
Vested (in shares)	(2,586,184)
Cancelled (in shares)	(735,686)
Outstanding, ending balance (in shares)	12,097,108
Grant Date Fair Value
Outstanding, beginning balance (in dollars per share)	$ 3.41	$ 3.54
Granted (in dollars per share)	3.33
Vested (in dollars per share)	3.47
Cancelled (in dollars per share)	3.62
Outstanding, ending balance (in dollars per share)	$ 3.41	$ 3.54