Notes Payable and Warrants (Additional Information) (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		3 Months Ended		6 Months Ended	9 Months Ended
	Aug. 08, 2025	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Aug. 13, 2024
Debt Instrument [Line Items]
Term loan description					The Company was required to pay the insurer an exit fee equal to 0.75% of the principal amount of the Term A Loans on the date on which the loans were prepaid.
Debt issuance costs					$ 2,083	$ 2,301
Loss on extinguishment of debt		$ 30,400	$ 0		30,400	$ 0
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 125,000
Letters of credit	15,000
Sublimit for swingline loans	$ 7,500
Variable rate	2.00%
Commitment fee	0.375%
lender fees	$ 2,400
Amount drawn under the revolving credit facility		0			0
Financing Agreement
Debt Instrument [Line Items]
Principal amount		$ 136,100			$ 136,100
Term loan maturity date		Jul. 17, 2028			Jul. 17, 2028
Interest rate for term loans		19.135%			19.135%
Specific additional interest rate of premium					0.50%
Financing Agreement \| Warrants to Purchase Series J Preferred Stock
Debt Instrument [Line Items]
Issued to the lenders series J warrants to purchase					0.6
Exercise price per share		$ 21.1725			$ 21.1725
Term A Loans \| Financing Agreement
Debt Instrument [Line Items]
Principal amount		$ 103,500			$ 103,500
Exit fee				0.75%
Interest rate for term loans		13.875%			13.875%
Term A Loans \| Maximum \| Financing Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 103,500			$ 103,500
Term B Loans \| Financing Agreement
Debt Instrument [Line Items]
Principal amount		32,600			32,600
Term Loan \| Financing Agreement
Debt Instrument [Line Items]
Initial insurance premium		$ 15,000			15,000
Debt issuance costs					$ 18,700
Maintain minimum interest reserve amount		0.079			0.079
Convertible Notes
Debt Instrument [Line Items]
Principal amount							$ 25,000
Term loan maturity date		Aug. 18, 2028			Aug. 18, 2028
Effective interest rate of the term loans		15.00%			15.00%
Outstanding principal amount					$ 25,000
Accrued interest					$ 800
Convertible Notes \| Revolving Credit Facility
Debt Instrument [Line Items]
Variable rate	3.00%
Convertible Notes \| Series D Preferred Stock
Debt Instrument [Line Items]
Preferred Stock settled shares					1.5

Firefly Aerospace Inc. 10-Q