Employee Benefit Plans - Stock Activity, Weighted Average Exercise Price (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Service Stock Options Awards
Shares
Options outstanding, beginning balance (in shares)			12,078,269
Granted (in shares)			2,726,689
Exercised (in shares)			(525,617)
Forfeited (in shares)			(740,582)
Options outstanding, end balance (in shares)	13,538,759		13,538,759		12,078,269
Options exercisable, ending balance (in shares)	7,850,918		7,850,918
Options unvested, ending balance (in shares)	5,687,841		5,687,841
Weighted Average Exercise Price
Options outstanding, beginning balance, weighted-average exercise price			$ 14.34
Granted, weighted-average exercise price			12.47
Exercised, weighted-average exercise price			2.50
Forfeited, weighted-average exercise price			28.01
Options outstanding, ending balance, weighted-average exercise price	$ 13.67		13.67		$ 14.34
Options exercisable, ending balance, weighted-average exercise price	10.98		10.98
Options unvested, ending balance, weighted-average exercise price	$ 17.39		$ 17.39
Stock option activity additional disclosures
Options outstanding, weighted-average remaining contractual term			7 years 5 months 23 days		7 years 6 months 25 days
Options exercisable, weighted-average remaining contractual term			6 years 2 months 12 days
Options unvested, weighted-average remaining contractual term			9 years 2 months 26 days
Options outstanding, aggregate intrinsic value	$ 19,007		$ 19,007		$ 42,835
Options exercisable, aggregate intrinsic value	19,007		$ 19,007
Weighted-average grant date fair value of options granted (per share)			$ 8.44	$ 15.31
Fair value of stock options that vested during the period			$ 24,400	$ 21,700
Compensation cost	8,600	$ 6,800	23,800	19,200
Unrecognized compensation cost	$ 51,400		$ 51,400
Period for recognition			2 years 1 month 6 days
Intrinsic fair value of options exercised			$ 4,200	$ 14,800
Performance Stock Option Awards
Shares
Options outstanding, beginning balance (in shares)			15,520,000
Granted (in shares)			6,405,000
Exercised (in shares)			0	0
Options outstanding, end balance (in shares)	21,925,000		21,925,000		15,520,000
Options exercisable, ending balance (in shares)	2,782,000		2,782,000
Options unvested, ending balance (in shares)	19,143,000		19,143,000
Weighted Average Exercise Price
Options outstanding, beginning balance, weighted-average exercise price			$ 26.87
Granted, weighted-average exercise price			7.87
Options outstanding, ending balance, weighted-average exercise price	$ 21.32		21.32		$ 26.87
Options exercisable, ending balance, weighted-average exercise price	26.92		26.92
Options unvested, ending balance, weighted-average exercise price	$ 20.50		$ 20.50
Stock option activity additional disclosures
Options outstanding, weighted-average remaining contractual term			5 years 6 months 7 days		5 years 9 months 21 days
Options granted, weighted-average remaining contractual term			6 years 7 months 17 days
Options exercisable, weighted-average remaining contractual term			4 years 11 months 23 days
Options unvested, weighted-average remaining contractual term			5 years 7 months 6 days
Weighted-average grant date fair value of options granted (per share)			$ 4.32	$ 12.78
Fair value of stock options that vested during the period			$ 20,800	$ 20,800
Option expected to vest (in shares)	1,391,000		1,391,000
Options expected to vest, weighted-average exercise price	$ 26.92		$ 26.92
Compensation cost	$ 18,400	$ 26,100	$ 53,600	$ 76,500
Unrecognized compensation cost	44,500		$ 44,500
Period for recognition			1 year 10 months 6 days
Aggregate intrinsic value of unvested options	$ 0		$ 0
Weighted average remaining contractual term of unvested options			4 years 11 months 23 days