Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses and Other Long-Term Liabilities - Components of Accrued Expenses and Other Long-Term Liabilities (Detail)

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Accrued Expenses and Other Long-Term Liabilities - Components of Accrued Expenses and Other Long-Term Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Accrued expenses:    
Salaries, bonuses and employee benefits $ 376us-gaap_AccruedSalariesCurrent $ 598us-gaap_AccruedSalariesCurrent
Severance 5us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits 38us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits
Professional fees 238us-gaap_AccruedProfessionalFeesCurrent 837us-gaap_AccruedProfessionalFeesCurrent
Research and development expenses 710fbio_AccruedResearchAndDevelopmentExpenses 832fbio_AccruedResearchAndDevelopmentExpenses
Ovamed manufacturing rights - short-term component 1,500fbio_OtherShortTermLiabilitiesRelatedToManufacturingRights 1,000fbio_OtherShortTermLiabilitiesRelatedToManufacturingRights
Payable to COH (Note 5) 2,000us-gaap_OtherAccountsPayableAndAccruedLiabilities 0us-gaap_OtherAccountsPayableAndAccruedLiabilities
Short-term lease abandonment charge 165fbio_LeaseAbandonmentCurrent 165fbio_LeaseAbandonmentCurrent
Other 244us-gaap_OtherAccruedLiabilitiesCurrent 213us-gaap_OtherAccruedLiabilitiesCurrent
Total accrued expenses 5,238us-gaap_AccruedLiabilitiesCurrent 3,683us-gaap_AccruedLiabilitiesCurrent
Other long-term liabilities:    
Ovamed manufacturing rights - long-term component 0fbio_OtherLongTermLiabilitiesRelatedToManufacturingRights 334fbio_OtherLongTermLiabilitiesRelatedToManufacturingRights
Long-term lease abandonment charge 207fbio_LeaseAbandonmentNonCurrent 268fbio_LeaseAbandonmentNonCurrent
Deferred rent 120us-gaap_DeferredRentCreditNoncurrent 120us-gaap_DeferredRentCreditNoncurrent
Total other long-term liabilities $ 327us-gaap_OtherLiabilitiesNoncurrent $ 722us-gaap_OtherLiabilitiesNoncurrent