Fortress Biotech, Inc. Annual report pursuant to Section 13 and 15(d)

Related Party Transactions (PIK Dividend or Equity Fee Payable) (Details)	12 Months Ended
	Dec. 31, 2023
Avenue
Related Party Transaction [Line Items]
Effective date	Feb. 17, 2015
PIK dividend as a percentage of fully diluted outstanding capitalization	2.50%
Baergic
Related Party Transaction [Line Items]
Effective date	Dec. 17, 2019
PIK dividend as a percentage of fully diluted outstanding capitalization	2.50%
Cellvation
Related Party Transaction [Line Items]
Effective date	Oct. 31, 2016
PIK dividend as a percentage of fully diluted outstanding capitalization	2.50%
Checkpoint
Related Party Transaction [Line Items]
Effective date	Mar. 17, 2015
Annual equity fee as a percentage of fully diluted outstanding capitalization	2.50%
Cyprium
Related Party Transaction [Line Items]
Effective date	Mar. 13, 2017
PIK dividend as a percentage of fully diluted outstanding capitalization	2.50%
Helocyte
Related Party Transaction [Line Items]
Effective date	Mar. 20, 2015
PIK dividend as a percentage of fully diluted outstanding capitalization	2.50%
Mustang
Related Party Transaction [Line Items]
Effective date	Mar. 13, 2015
PIK dividend as a percentage of fully diluted outstanding capitalization	2.50%
Oncogenuity
Related Party Transaction [Line Items]
Effective date	Apr. 22, 2020
PIK dividend as a percentage of fully diluted outstanding capitalization	2.50%
Urica
Related Party Transaction [Line Items]
Effective date	Nov. 07, 2017
PIK dividend as a percentage of fully diluted outstanding capitalization	2.50%