Warrants - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions							3 Months Ended		9 Months Ended
	Mar. 05, 2024	Mar. 04, 2024	Feb. 28, 2024	Feb. 27, 2024	Jun. 13, 2023	Feb. 11, 2021	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Jan. 19, 2023
Class of Warrant or Right [Line Items]
Common stock, issued (in shares)							250,060,927		250,060,927		157,287,522
2023 Registered Direct Offering Warrants
Class of Warrant or Right [Line Items]
Exercise price (in usd per shares)											$ 2.32
Number of securities called by warrant (in shares)				8,886,255
Proceeds from warrant exercises				$ 20.6
Derivative gain (loss)								$ 6.1	$ (10.1)	$ 4.3
2023 Registered Direct Offering Warrants | Registered Direct Offering
Class of Warrant or Right [Line Items]
Common stock, issued (in shares)					11,848,341
Exercise price (in usd per shares)					$ 2.32
Class of warrant or right, exercisable (in shares)					8,886,255
Post issuance period					6 months
Warrants and rights outstanding, term (in years)					5 years
Number of securities called by warrant (in shares)					0.75
2024 RDO warrants
Class of Warrant or Right [Line Items]
Exercise price (in usd per shares)			$ 3.78				$ 3.78		$ 3.78
Number of securities called by warrant (in shares)			5,800,000
Derivative gain (loss)							$ 0.5		$ 8.9
Expiration period (in years)			5 years
Fair value of derivative liability							$ 6.3		$ 6.3
Warrants issued (in shares)							5,800,000		5,800,000
Warrants outstanding (in shares)							5,800,000		5,800,000
2023 PIPE warrants
Class of Warrant or Right [Line Items]
Exercise price (in usd per shares)												$ 2.39
Number of securities called by warrant (in shares)		13,888,889
Proceeds from warrant exercises		$ 33.2
Derivative gain (loss)								$ 9.6	$ (32.2)	$ (2.2)
2023 PIPE warrants | Private Placement
Class of Warrant or Right [Line Items]
Common stock, issued (in shares)												13,888,889
Exercise price (in usd per shares)												$ 2.39
Class of warrant or right, number of securities called by warrants or rights (in shares)												13,888,889
Beneficial ownership percentage												4.99%
2024 PIPE warrants
Class of Warrant or Right [Line Items]
Exercise price (in usd per shares)	$ 4.75	$ 4.75					$ 4.75		$ 4.75
Number of securities called by warrant (in shares)	9,000,000
Derivative gain (loss)							$ 0.8		$ 18.5
Expiration period (in years)	5 years
Fair value of derivative liability							$ 9.5		$ 9.5
Warrants issued (in shares)							9,000,000		9,000,000
Warrants outstanding (in shares)							9,000,000		9,000,000
IPO Public Warrants
Class of Warrant or Right [Line Items]
Exercise price (in usd per shares)						$ 11.50
Number of securities called by warrant (in shares)						1
Warrants issued (in shares)							12,168,378		12,168,378		12,150,878
Warrants outstanding (in shares)							12,168,378		12,168,378		12,150,878
Class of warrant or right, redemption price (in usd per share)						$ 0.01
Minimum period of prior written notice of redemption of warrants						30 days
Warrants redemption covenant threshold trading period						20 days
Warrants redemption covenant threshold consecutive trading period						30 days			3 days
IPO Public Warrants | Minimum
Class of Warrant or Right [Line Items]
Minimum strike price (in usd per share)						$ 18.00
IPO Private Warrants
Class of Warrant or Right [Line Items]
Exercise price (in usd per shares)							$ 11.50		$ 11.50		$ 11.50
Fair value of derivative liability							$ 0.1		$ 0.1		$ 0.1
Warrants issued (in shares)							157,394		157,394		174,894
Warrants outstanding (in shares)							157,394		157,394		174,894