Employee Benefit Plans - Stock Activity, Weighted Average Exercise Price (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Shares
Granted (in shares)	1,726,500	2,255,096	9,147,125	9,131,689
Service Stock Options Awards
Shares
Options outstanding, beginning balance (in shares)			17,336,362
Options exercisable, beginning balance (in shares)			8,288,944
Options unvested, beginning balance (in shares)			9,047,418
Granted (in shares)			6,194,625
Exercised (in shares)			(47,500)
Forfeited (in shares)			(2,869,251)
Options outstanding, end balance (in shares)	20,614,236		20,614,236		17,336,362
Options exercisable, ending balance (in shares)	8,733,294		8,733,294		8,288,944
Options unvested, ending balance (in shares)	11,880,942		11,880,942		9,047,418
Weighted Average Exercise Price
Options outstanding, beginning balance, weighted-average exercise price			$ 11.37
Options exercisable, beginning balance, weighted-average exercise price			11.84
Options unvested, beginning balance, weighted-average exercise price			10.94
Granted, weighted-average exercise price			2.45
Exercised, weighted-average exercise price			2.09
Forfeited, weighted-average exercise price			15.98
Options outstanding, ending balance, weighted-average exercise price	$ 8.07		8.07		$ 11.37
Options exercisable, ending balance, weighted-average exercise price	11.56		11.56		11.84
Options unvested, ending balance, weighted-average exercise price	$ 5.51		$ 5.51		$ 10.94
Stock option activity additional disclosures
Options outstanding, weighted-average remaining contractual term			7 years 4 months 6 days		7 years 10 months 9 days
Options exercisable, weighted-average remaining contractual term			5 years 7 months 17 days		6 years 2 months 4 days
Options unvested, weighted-average remaining contractual term			8 years 7 months 13 days		9 years 4 months 20 days
Options outstanding, aggregate intrinsic value	$ 476,000		$ 476,000		$ 11,391,000
Options exercisable, aggregate intrinsic value	342,000		342,000		7,250,000
Options unvested, aggregate intrinsic value	134,000		$ 134,000		$ 4,141,000
Weighted-average grant date fair value of options granted (per share)			$ 1.73	$ 8.44
Fair value of stock options that vested during the period			$ 16,900,000	$ 24,400,000
Unrecognized compensation cost	$ 32,900,000		$ 32,900,000
Period for recognition			1 year 10 months 13 days
Intrinsic fair value of options exercised			$ 43,000	$ 4,200,000
Market Condition Stock Option Awards
Shares
Options outstanding, beginning balance (in shares)			21,925,000
Options exercisable, beginning balance (in shares)			2,782,000
Options unvested, beginning balance (in shares)			19,143,000
Granted (in shares)			2,952,500
Exercised (in shares)			0	0
Forfeited (in shares)			(12,311,500)
Options outstanding, end balance (in shares)	12,566,000		12,566,000		21,925,000
Options exercisable, ending balance (in shares)	5,372,667		5,372,667		2,782,000
Options unvested, ending balance (in shares)	7,193,333		7,193,333		19,143,000
Weighted Average Exercise Price
Options outstanding, beginning balance, weighted-average exercise price			$ 21.32
Options exercisable, beginning balance, weighted-average exercise price			26.9
Options unvested, beginning balance, weighted-average exercise price			20.50
Granted, weighted-average exercise price			2.42
Forfeited, weighted-average exercise price			25.45
Options outstanding, ending balance, weighted-average exercise price	$ 12.83		12.83		$ 21.32
Options exercisable, ending balance, weighted-average exercise price	22.46		22.46		26.9
Options unvested, ending balance, weighted-average exercise price	$ 5.63		$ 5.63		$ 20.50
Stock option activity additional disclosures
Options outstanding, weighted-average remaining contractual term			5 years 5 months 8 days		5 years 3 months 7 days
Options exercisable, weighted-average remaining contractual term			4 years 4 months 9 days		4 years 8 months 12 days
Options unvested, weighted-average remaining contractual term			6 years 2 months 26 days		5 years 4 months 6 days
Weighted-average grant date fair value of options granted (per share)			$ 0.49	$ 4.32
Fair value of stock options that vested during the period			$ 25,500,000	$ 20,800,000
Option expected to vest (in shares)	2,513,333		2,513,333
Unvested stock options expected to vest period for calculation of weighted- average exercise price			5 years 7 months 17 days
Unvested stock options, weighted- average exercise price	$ 7.87		$ 7.87
Non-cash compensation expense reversals compensation cost			$ 23,200,000
Unrecognized compensation cost	$ 7,800,000		7,800,000
Aggregate intrinsic value of unvested performance stock options	$ 0		$ 0
Period for recognition			1 year 9 months 3 days