Fortress Biotech, Inc. Quarterly report [Sections 13 or 15(d)]

Quarterly report [Sections 13 or 15(d)]

Stockholders' Equity (Capital Raises) (Narrative) (Details)

Stockholders' Equity (Capital Raises) (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended					3 Months Ended
	Jan. 15, 2026	Jun. 12, 2024	Dec. 30, 2022	Aug. 31, 2025	Mar. 31, 2025	Feb. 28, 2025	Jan. 31, 2025	May 31, 2024	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Stockholders' Equity
Stock offering, number of shares issued									0
Exercise of warrants for cash									$ 1,218	$ 17
Sale of stock, net proceeds			$ 150,000
Warrants exercised, Number of shares									694,296
Outstanding warrants									12,737,206		13,431,502
Common Stock, par value									$ 0.001		$ 0.001
Checkpoint \| Founder agreement
Stockholders' Equity
Stock offering, number of shares issued										18,500
Shares issued (in percent)							2.50%
Checkpoint \| 2025 Warrant
Stockholders' Equity
Exercise of warrants for cash					$ 36,000		$ 2,100
Number of shares issued upon exercise of warrants					21,691,003		740,000
Exercise price of warrants					$ 1.66		$ 2.84			$ 1.66
Avenue \| Unregistered warrants
Stockholders' Equity
Net proceeds								$ 3,900
At the Market Offering
Stockholders' Equity
Stock offering, number of shares issued				3,750,000						500,000
Stock purchase, price per share					$ 1.94					$ 1.94
Sale of stock, net proceeds										$ 1,000
At the Market Offering \| Mustang \| Founder agreement
Stockholders' Equity
Stock offering, number of shares issued									0	54,000
Sale of stock, net proceeds										$ 600
At the Market Offering \| Avenue \| Founder agreement
Stockholders' Equity
Stock offering, number of shares issued									23,474
Shares issued (in percent)									2.50%
At the Market Offering \| Avenue \| Unregistered warrants
Stockholders' Equity
Shares issued									900,000
Net proceeds									$ 2,100
Shelf Registration Statement
Stockholders' Equity
Stock offering, number of shares issued	150,000,000								0	800,000
Stock offering, gross proceeds										$ 4,100
Shelf Registration 2024 Statement
Stockholders' Equity
Amount available for future stock offerings									$ 42,100
Shelf Registration 2024 Statement \| Mustang
Stockholders' Equity
Stock offering, aggregate offering permitted by the agreement									$ 34,200
Shelf Registration 2024 Statement \| Maximum \| Mustang
Stockholders' Equity
Stock offering, aggregate offering permitted by the agreement		$ 40,000
February 2025 Equity Offering \| Checkpoint \| Founder agreement
Stockholders' Equity
Stock offering, number of shares issued						67,806
Shares issued (in percent)						2.50%
February 2025 Equity Offering \| Mustang
Stockholders' Equity
Stock offering, number of shares issued						495,000
Stock purchase, price per share						$ 3.01
Exercise price of warrants						$ 3.01
Number of warrants to purchase shares						2,162,807
Sale of stock, net proceeds						$ 6,800
Common Stock, par value						$ 0.0001
February 2025 Equity Offering \| Mustang \| Series C-1 warrants
Stockholders' Equity
Number of warrants to purchase shares						2,657,807
Warrant expiration term						5 years
February 2025 Equity Offering \| Mustang \| Series C-2 warrants
Stockholders' Equity
Number of warrants to purchase shares						2,657,807
Warrant expiration term						24 months
February 2025 Equity Offering \| Mustang \| Pre funded warrants
Stockholders' Equity
Stock purchase, price per share						$ 3.0099
Exercise price of warrants						$ 0.0001