Equity - Issuance of Spirit Equity Securities (Details) - USD ($)				2 Months Ended	10 Months Ended	12 Months Ended
	Mar. 13, 2025	Mar. 12, 2025	Dec. 30, 2024	Mar. 12, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Class of Stock [Line Items]
Common stock, shares issued (in shares)					28,320,815	111,661,332
Warrants outstanding (in shares)	24,255,256
Proceeds from issuance of common stock and warrants				$ 350,000,000	$ 0	$ 0	$ 0
Backstop Commitment Agreement, Specified Parties, November 18, 2024
Class of Stock [Line Items]
Common stock, shares issued (in shares)		678,587		678,587
Warrants outstanding (in shares)		5,670,853		5,670,853
Backstop Commitment Agreement, Specified Parties
Class of Stock [Line Items]
Common stock, shares issued (in shares)		3,849,442		3,849,442
Proceeds from issuance of common stock and warrants		$ 53,892,188
Senior Notes
Class of Stock [Line Items]
Debtor reorganization items, debt equitization		410,000,000.0
Convertible notes
Class of Stock [Line Items]
Debtor reorganization items, debt equitization		$ 385,000,000.0
Debt Equitization
Class of Stock [Line Items]
Warrants outstanding (in shares)		5,203,899		5,203,899
Debt Equitization
Class of Stock [Line Items]
Common stock, shares issued (in shares)		7,618,664		7,618,664
Private Placement
Class of Stock [Line Items]
Common stock, shares issued (in shares)	7,770,054
Warrants outstanding (in shares)	13,380,504
Proceeds from issuance of common stock and warrants	$ 296,107,812
Consideration received on sale of shares			$ 350,000,000.0
Sale of stock price per share (in usd per share)			$ 14.00