Share-Based Compensation - RSUs (Details) - $ / shares	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Weighted Average Grant Date Fair Value
Total shares of common stock reserved	40,491,541	43,767,101
Restricted stock units
RSUs
Beginning balance, unvested	17,434,138
Granted (in shares)	8,576,496
Vested (in shares)	(9,851,103)
Forfeited (in shares)	(1,533,784)
Ending balance, unvested	14,625,747
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 4.30
Granted (in dollars per share)	1.90
Vested (in dollars per share)	3.70
Forfeited (in dollars per share)	5.79
Ending balance (in dollars per share)	$ 3.15
Total shares of common stock reserved	613,029
Service-based
RSUs
Beginning balance, unvested	12,351,544
Granted (in shares)	7,108,327
Vested (in shares)	(8,200,523)
Forfeited (in shares)	(1,300,775)
Ending balance, unvested	9,958,573
Performance-based
RSUs
Beginning balance, unvested	1,805,550
Granted (in shares)	1,468,169
Vested (in shares)	(1,181,573)
Forfeited (in shares)	(233,009)
Ending balance, unvested	1,859,137
Market-based
RSUs
Beginning balance, unvested	3,277,044
Granted (in shares)	0
Vested (in shares)	(469,007)
Forfeited (in shares)	0
Ending balance, unvested	2,808,037