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

Annual report pursuant to Section 13 and 15(d)

Executive Officer Agreements - Additional Information (Detail)

Executive Officer Agreements - Additional Information (Detail) (USD $)	12 Months Ended	1 Months Ended	0 Months Ended	1 Months Ended		12 Months Ended	1 Months Ended
	Dec. 31, 2014	Dec. 19, 2013	Nov. 05, 2013	Dec. 28, 2013	Dec. 28, 2012	Dec. 31, 2013	Feb. 20, 2014	Dec. 31, 2012
Schedule Of Executive Officer Agreements [Line Items]
Optilons To Purchase Common Stock Gant In Period	0
Option To Purchase Common Stock Grant In Period Excercise Price	$ 0
Harlan F. Weisman [Member]
Schedule Of Executive Officer Agreements [Line Items]
Monthly Consulting Fees Payable To Executive		$ 3,450
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost		318,000
Lindsay A. Rosenwald [Member]
Schedule Of Executive Officer Agreements [Line Items]
Officers Compensation		28,275
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		1,979,346
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value Amount Per Share		$ 1.93
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value		3,800,000
Kevin Hogan [Member]
Schedule Of Executive Officer Agreements [Line Items]
Severance Cost Payable to Executive Under Separation And Lease Agrement	400,000
Officers Compensation			340,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period			200,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			200,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price			$ 1.71
Severance Costs	400,000
Glenn L. Cooper [Member]
Schedule Of Executive Officer Agreements [Line Items]
Period Of Consulting Fees Payable Under Consulting Agreement				12 years	12 years
Bobby W. Sandage [Member]
Schedule Of Executive Officer Agreements [Line Items]
Period Of COBRA Premium Payable Under Consulting Agreement				12 years	12 years
Severance Cost Payable to Executive Under Separation And Lease Agrement						445,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total						135,000
Severance Costs						445,000
Michael Weiss [Member]
Schedule Of Executive Officer Agreements [Line Items]
Officers Compensation		28,275
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		1,979,346					3,958,692
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value Amount Per Share		$ 1.93					$ 2.69
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value		3,800,000					10,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights							Such shares shall vest at a rate of 16.67% for the first three annual anniversaries and the remaining 50% will vest in five equal installments of 10% upon certain events occurring.
Malcolm Hoenlein [Member]
Schedule Of Executive Officer Agreements [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period							30,000
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value Amount Per Share							$ 2.69
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value							80,700
Messrs Lobell [Member]
Schedule Of Executive Officer Agreements [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period							50,000
Messrs Barrett [Member]
Schedule Of Executive Officer Agreements [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period							50,000
Messrs Harvey [Member]
Schedule Of Executive Officer Agreements [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period							50,000
Old Chairman and Chief Executive Officer [Member]
Schedule Of Executive Officer Agreements [Line Items]
Severance Cost Payable to Executive Under Separation And Lease Agrement						900,000
Severance Costs						900,000
Chairman and Chief Executive Officer [Member]
Schedule Of Executive Officer Agreements [Line Items]
Optilons To Purchase Common Stock Gant In Period								1,686,590
Option To Purchase Common Stock Grant In Period Excercise Price								$ 5.57
Executive Vice President [Member]
Schedule Of Executive Officer Agreements [Line Items]
Severance Cost Payable to Executive Under Separation And Lease Agrement						479,000
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost			390,000
Severance Costs						$ 479,000