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

Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Accounting Policies [Line Items]
Percentage of tax benefit likely of being realized	50.00%
Restricted Cash and Cash Equivalents	$ 14,600,000
Gain (Loss) on Sale of Assets and Asset Impairment Charges		400,000
Equity Method Investments, Fair Value Disclosure	3,945,000		4,160,000
Long Term Notes Payable	24,009,000us-gaap_LongTermNotesPayable		14,009,000us-gaap_LongTermNotesPayable
Letter of Credit [Member]
Accounting Policies [Line Items]
Long-term Line of Credit	600,000
Hercules Note Payble [Member]
Accounting Policies [Line Items]
Long Term Notes Payable	$ 14,000,000

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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