Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses and Other Long-Term Liabilities - Additional Information (Detail)

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Accrued Expenses and Other Long-Term Liabilities - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 12, 2014
Dec. 12, 2016
Dec. 12, 2015
Dec. 31, 2012
Schedule Accrued Expenses And Other Long-Term Liabilities [Line Items]              
Other Accrued Liabilities, Current $ 244,000us-gaap_OtherAccruedLiabilitiesCurrent   $ 213,000us-gaap_OtherAccruedLiabilitiesCurrent        
Asset Retirement Obligation, Accretion Expense 166,000us-gaap_AssetRetirementObligationAccretionExpense 37,000us-gaap_AssetRetirementObligationAccretionExpense          
Capital Leases, Future Minimum Payments Receivable, Next Twelve Months       500,000us-gaap_CapitalLeasesFutureMinimumPaymentsReceivableCurrent      
Subsequent Event [Member]              
Schedule Accrued Expenses And Other Long-Term Liabilities [Line Items]              
Capital Leases, Future Minimum Payments, Receivable in Two Years           500,000us-gaap_CapitalLeasesFutureMinimumPaymentsReceivableInTwoYears
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember 		 
Capital Leases, Future Minimum Payments, Receivable in Three Years         500,000us-gaap_CapitalLeasesFutureMinimumPaymentsReceivableInThreeYears
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember 		   
Ovamed Manufacturing Rights [Member]              
Schedule Accrued Expenses And Other Long-Term Liabilities [Line Items]              
Other Liabilities             1,500,000us-gaap_OtherLiabilities
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= fbio_OvamedManufacturingRightsMember
Other Accrued Liabilities, Current $ 1,500,000us-gaap_OtherAccruedLiabilitiesCurrent
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= fbio_OvamedManufacturingRightsMember