Fortress Biotech, Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Debt and Interest (Narrative) (Details)

Debt and Interest (Narrative) (Details) $ / shares in Units, $ in Thousands						1 Months Ended	3 Months Ended			6 Months Ended		12 Months Ended
	Jul. 25, 2024 USD ($)	Jun. 27, 2024 shares	Dec. 27, 2023 USD ($)	Dec. 30, 2022 shares	Aug. 27, 2020 USD ($)	Feb. 28, 2026	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Feb. 28, 2023 USD ($) $ / shares shares	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2025 USD ($)	Jul. 09, 2024 USD ($)	Dec. 31, 2023 USD ($)	Aug. 31, 2020 USD ($)
Debt Instrument [Line Items]
Amortization of Debt Issuance Costs							$ 631	$ 1,223		$ 1,240	$ 2,199
Stock offering, number of shares issued \| shares				4,900,000
Oaktree Note
Debt Instrument [Line Items]
Debt instrument face amount															$ 60,000
Debt maturity date					Aug. 27, 2025
Amortization of Debt Issuance Costs							522	712		1,024	1,136
Total notes payable, gross					$ 50,000		50,000			50,000				$ 50,000
Oaktree Note \| Subsequent Events
Debt Instrument [Line Items]
Debt instrument face amount	$ 50,000
Debt instrument, unused borrowing capacity, amount	$ 15,000
Debt Instrument, Floor Rate	2.50
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:SecuredOvernightFinancingRateSofrMember
Basis spread on variable rate	7.625%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:SecuredOvernightFinancingRateSofrMember
Proceeds from debt	$ 35,000
Total notes payable, gross	$ 50,000
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:SecuredOvernightFinancingRateSofrMember
Partner company notes payable
Debt Instrument [Line Items]
Amortization of Debt Issuance Costs							$ 64	272		$ 126	432
SWK Term Loan [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 20,000
Proceeds from Lines of Credit			15,000
Remaining borrowing capacity			$ 5,000
Debt Instrument, Floor Rate			5
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]			us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Basis spread on variable rate			7.75%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]			us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Debt Instrument, Percentage of Exit Fees							5.00%			5.00%
Payments of Debt Issuance Costs										$ 200
Amortization of Debt Issuance Costs										$ 200
Debt, effective interest rate							14.90%			14.90%
Total notes payable, gross							$ 20,000			$ 20,000				$ 15,000
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]			us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
SWK Term Loan [Member] \| Debt Instrument, Repayment Period from February 2026 If Total Revenue Measured on Trailing Twelve Month Basis is Less than Threshold Revenue as of December 31, 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment, Percentage of Principal Amount						7.50%
Debt Instrument, Threshold Revenue Considered for No Periodic Payment												$ 70,000
SWK Term Loan [Member] \| Debt Instrument, Repayment Period from February 2027 If Total Revenue Measured on Trailing Twelve Month Basis is Greater than Threshold Revenue as of December 31, 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment, Percentage of Principal Amount						15.00%
SWK Term Loan [Member] \| If Debt Instruments Prepaid Prior To First Anniversary of Closing Date [Member]
Debt Instrument [Line Items]
Debt Instrument, Percentage of Prepayment Premium							2.00%			2.00%
SWK Term Loan [Member] \| If Debt Instrument Prepaid On Or After First Anniversary But Prior To Second Anniversary Of Closing Date [Member]
Debt Instrument [Line Items]
Debt Instrument, Percentage of Prepayment Premium							1.00%			1.00%
SWK Term Loan [Member] \| If Debt Instrument Prepaid After Second Anniversary Of Closing Date [Member]
Debt Instrument [Line Items]
Debt Instrument, Percentage of Prepayment Premium							0.00%			0.00%
SWK Term Loan [Member] \| Subsequent Events
Debt Instrument [Line Items]
Maximum borrowing capacity													$ 25,000
Line of credit facility additional borrowing capacity													$ 5,000
Urica
Debt Instrument [Line Items]
Aggregate gross proceeds from convertible preferred stock							$ 20,000			$ 20,000
Urica \| Common Stock Warrant
Debt Instrument [Line Items]
Class of warrant or right value of securities called by warrants or rights \| shares		2,028,345
Urica \| 8% Cumulative Convertible Class B Preferred Offering
Debt Instrument [Line Items]
Preferred Stock, dividend rate percentage		8.00%							8.00%
Stock offering, price per share \| $ / shares									$ 25.00
Stock offering, number of shares issued \| shares									135,494
Stock offering, gross proceeds									$ 3,400
Stock offering, aggregate fees paid									500
Warrants, fair value									$ 100
Common stock's average 10-day trading price discount percentage									7.50%
Interest expense							$ 100	$ 100		$ 100	$ 100