Quarterly report pursuant to Section 13 or 15(d)

Investment at Fair Value - Additional Information (Detail)

v2.4.1.9
Investment at Fair Value - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Method Investments $ 250,000us-gaap_EquityMethodInvestments $ 250,000us-gaap_EquityMethodInvestments
Trading Securities 20,005,000us-gaap_TradingSecurities 20,002,000us-gaap_TradingSecurities
Fair Value Assumptions, Expected Volatility Rate 25.60%us-gaap_FairValueAssumptionsExpectedVolatilityRate  
Share Price $ 2.73us-gaap_SharePrice  
Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease) 200,000us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValuePeriodIncreaseDecrease  
Investment Owned, at Fair Value 3,700,000us-gaap_InvestmentOwnedAtFairValue  
Working Capital 500,000fbio_WorkingCapital  
Working Capital Committed 100,000fbio_WorkingCapitalCommitted  
Redeemable warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Business Acquisition, Share Price $ 0.75us-gaap_BusinessAcquisitionSharePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= fbio_RedeemableWarrantsMember 		 
Non Redeemable warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Business Acquisition, Share Price $ 0.91us-gaap_BusinessAcquisitionSharePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= fbio_NonRedeemableWarrantsMember 		 
Binomial Lattice Model [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Assumptions, Risk Free Interest Rate 1.37%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FairValueByMeasurementBasisAxis
= fbio_BinomialLatticeModelMember 		 
Fair Value Assumptions, Weighted Average Volatility Rate 25.60%us-gaap_FairValueAssumptionsWeightedAverageVolatilityRate
/ us-gaap_FairValueByMeasurementBasisAxis
= fbio_BinomialLatticeModelMember 		 
Fair Value Assumptions, Exercise Price $ 11.50us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_FairValueByMeasurementBasisAxis
= fbio_BinomialLatticeModelMember 		 
US Treasury Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading Securities 20,000,000us-gaap_TradingSecurities
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= us-gaap_USTreasurySecuritiesMember 		20,000,000us-gaap_TradingSecurities
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= us-gaap_USTreasurySecuritiesMember
Common Stock Subject to Mandatory Redemption [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net Assets $ 38,000,000us-gaap_AssetsNet
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= us-gaap_CommonStockSubjectToMandatoryRedemptionMember 		 
Private Units [Member] | Ghaidarov Model [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Share Price $ 2.90us-gaap_SharePrice
/ us-gaap_FairValueByMeasurementBasisAxis
= fbio_GhaidarovModelMember
/ us-gaap_StatementClassOfStockAxis
= fbio_PrivateUnitsMember