CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Current notes designated at Fair Value Option	$ 11.9	$ 0.0
Non-current notes designated at Fair Value Option	$ 21.7	$ 31.0
Redeemable preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Redeemable preferred stock, designated from authorized preferred stock	178	0
Redeemable preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Redeemable preferred stock, shares issued (in shares)	99	99
Redeemable preferred stock, shares outstanding (in shares)	0	0
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Convertible preferred stock, shares designated (in shares)	7,535,013	7,534,834
Convertible preferred stock, shares issued (in shares)	99	178
Convertible preferred stock, shares outstanding (in shares)	99	178
Series B-2 convertible preferred stock
Convertible preferred stock, shares designated (in shares)	10,165	10,165
Convertible preferred stock, shares issued (in shares)	0	0
Convertible preferred stock, shares outstanding (in shares)	0	0
Series C perpetual preferred stock
Convertible preferred stock, shares designated (in shares)	1,011,000	1,011,000
Convertible preferred stock, shares issued (in shares)	0	0
Convertible preferred stock, shares outstanding (in shares)	0	0
Series G convertible preferred stock
Convertible preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Convertible preferred stock, shares designated (in shares)	137	137
Convertible preferred stock, shares issued (in shares)	0	122
Convertible preferred stock, shares outstanding (in shares)	0	122
Series H convertible preferred stock
Convertible preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Convertible preferred stock, shares designated (in shares)	105	105
Convertible preferred stock, shares issued (in shares)	0	0
Convertible preferred stock, shares outstanding (in shares)	0	0
Series I convertible preferred stock
Convertible preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Convertible preferred stock, shares designated (in shares)	118	118
Convertible preferred stock, shares issued (in shares)	0	56
Convertible preferred stock, shares outstanding (in shares)	0	56
Common Stock | Common stock - voting
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	298,000,000	298,000,000
Common stock, shares issued (in shares)	528,440	48,942
Common stock, shares outstanding (in shares)	528,440	48,942
Common Stock | Common stock - non-voting
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	9	9
Common stock, shares outstanding (in shares)	9	9