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

Quarterly report pursuant to Section 13 or 15(d)

Cover
- Document And Entity Information
Financial Statements
Notes to Financial Statements
Accounting Policies
- Summary of Significant Accounting Policies (Policies)
Notes Tables
Notes Details

Common Stock - Additional Information (Detail)

v2.4.1.9

Common Stock - Additional Information (Detail) (USD $)	3 Months Ended
Common Stock - Additional Information (Detail) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense related to all unvested stock option	$ 900,000
Employee Stock Purchase Plan to eligible employees, Number of shares purchased by employees	63,194
Employee Stock Purchase Plan to eligible employees, Number of shares available for future sales	136,806
Employee Stock Purchase Plan to eligible employees, compensation expense recognized	9,000	6,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	15,600,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	6 months
Warrant [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Class of Warrant or Right, Outstanding	685,061		685,061
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 6.85		$ 6.85
Research and Development Expense [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Allocated Share-based Compensation Expense	300,000	300,000
General and Administrative Expense [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 1,200,000	$ 800,000
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 9 months 4 days
Deferred Compensation Arrangement with Individual, Shares Issued	250,000

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