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

Subsequent Events - Checkpoint (Details)

Subsequent Events - Checkpoint (Details) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended
	Nov. 14, 2023	Dec. 30, 2022	Nov. 30, 2023	Oct. 31, 2023	Jul. 31, 2023	Feb. 28, 2023	Jun. 13, 2023	Apr. 30, 2023
Subsequent Events
Purchase price							$ 8.136
Sale of National Holding's stock, proceeds received	$ 8.9	$ 150.0			$ 9.1	$ 6.7
Checkpoint Common Stock Warrants \| Series A Warrants
Subsequent Events
Warrant expiration term								5 years
Checkpoint Common Stock Warrants \| Series B Warrants
Subsequent Events
Warrant expiration term								18 months
Direct offering \| Checkpoint Common Stock Warrants
Subsequent Events
Purchase price								$ 3.35
Stock offering, aggregate fees paid					$ 0.9
Subsequent Events
Subsequent Events
Purchase price			$ 1.70
Warrant expiration term			5 years
Sale of National Holding's stock, proceeds received			$ 8.9
Subsequent Events \| Checkpoint Common Stock Warrants
Subsequent Events
Warrants issued				6,325,354
Purchase price				$ 4.075
Net proceeds				$ 11.1
Sale of National Holding's stock, proceeds received				10.0
Stock offering, aggregate fees paid				$ 1.1
Subsequent Events \| Checkpoint Common Stock Warrants \| Common Stock Warrant
Subsequent Events
Purchase price				$ 1.51
Subsequent Events \| Checkpoint Common Stock Warrants \| Series A Warrants
Subsequent Events
Warrants issued				6,325,354
Warrant expiration term				5 years
Subsequent Events \| Checkpoint Common Stock Warrants \| Series B Warrants
Subsequent Events
Warrants issued				6,325,354
Warrant expiration term				24 months
Subsequent Events \| Minimum \| Checkpoint Common Stock Warrants
Subsequent Events
Purchase price				$ 1.76
Subsequent Events \| Direct offering \| Checkpoint Common Stock Warrants
Subsequent Events
Purchase price				$ 5.00