Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

v2.4.1.9
Subsequent Events - Additional Information (Detail) (Subsequent Event [Member], Dia Vax Biosciences [Member], USD $)
In Millions, unless otherwise specified
0 Months Ended
Apr. 02, 2015
Subsequent Event [Member] | Dia Vax Biosciences [Member]
 
Subsequent Event [Line Items]  
Payments for Fees $ 0.2us-gaap_PaymentsForFees
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ fbio_TypeOfAgreementAxis
= fbio_DiaVaxBiosciencesMember