Employee Benefit Plans - Stock Activity, Weighted Average Exercise Price (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Shares
Granted (in shares)	313,000	94,550
Stock option activity additional disclosures
Compensation cost	$ 10,371	$ 40,181
Options granted	313,000	94,550
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)	313,000
Exercised (in shares)	(20,000)
Forfeited (in shares)	(920,300)
Options outstanding, end balance (in shares)	16,709,062		17,336,362
Options exercisable, ending balance (in shares)	8,334,755		8,288,944
Options unvested, ending balance (in shares)	8,374,307		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	3.28
Exercised, weighted-average exercise price	2.10
Forfeited, weighted-average exercise price	19.42
Options outstanding, ending balance, weighted-average exercise price	10.79		$ 11.37
Options exercisable, ending balance, weighted-average exercise price	11.93		11.84
Options unvested, ending balance, weighted-average exercise price	$ 9.65		$ 10.94
Stock option activity additional disclosures
Options outstanding, weighted-average remaining contractual term	7 years 7 months 6 days		7 years 10 months 9 days
Options exercisable, weighted-average remaining contractual term	5 years 10 months 24 days		6 years 2 months 4 days
Options unvested, weighted-average remaining contractual term	9 years 3 months 14 days		9 years 4 months 20 days
Options outstanding, aggregate intrinsic value	$ 3,858		$ 11,391
Options exercisable, aggregate intrinsic value	3,792		7,250
Options unvested, aggregate intrinsic value	$ 66		$ 4,141
Weighted-average grant date fair value of options granted (per share)	$ 2.41	$ 10.48
Fair value of stock options that vested during the period	$ 6,100	$ 7,500
Option expected to vest (in shares)	3,904,333
Compensation cost	$ 6,900	8,200
Unrecognized compensation cost	$ 40,700
Period for recognition	1 year 11 months 26 days
Intrinsic fair value of options exercised	$ 30	$ 1,300
Options granted	313,000
Performance 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
Exercised (in shares)	0	0
Forfeited (in shares)	(2,250,000)
Options outstanding, end balance (in shares)	19,675,000		21,925,000
Options exercisable, ending balance (in shares)	2,782,000		2,782,000
Options unvested, ending balance (in shares)	16,893,000		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
Options outstanding, ending balance, weighted-average exercise price	21.44		$ 21.32
Options exercisable, ending balance, weighted-average exercise price	26.92		26.9
Options unvested, ending balance, weighted-average exercise price	$ 20.54		$ 20.50
Stock option activity additional disclosures
Options outstanding, weighted-average remaining contractual term	4 years 11 months 12 days		5 years 3 months 7 days
Options exercisable, weighted-average remaining contractual term	4 years 5 months 23 days		4 years 8 months 12 days
Options unvested, weighted-average remaining contractual term	5 years 10 days		5 years 4 months 6 days
Weighted-average grant date fair value of options granted (per share)	$ 0	$ 0
Fair value of stock options that vested during the period	$ 0	$ 0
Unvested stock options expected to vest period for calculation of weighted- average exercise price	5 years 6 months 14 days
Unvested stock options, weighted- average exercise price	$ 14.66
Compensation cost	$ 6,100	$ 17,400
Unvested performance stock options	15,200
Non-cash compensation expense reversals compensation cost	9,100
Unrecognized compensation cost	21,000
Aggregate intrinsic value of unvested performance stock options	$ 0
Period for recognition	1 year 4 months 17 days