Quarterly report pursuant to Section 13 or 15(d)

Common Stock - Employee Stock Purchase Programs (Detail)

v2.4.1.9
Common Stock - Employee Stock Purchase Programs (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 1,470us-gaap_EmployeeBenefitsAndShareBasedCompensation $ 1,135us-gaap_EmployeeBenefitsAndShareBasedCompensation
Employee Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 1,463us-gaap_EmployeeBenefitsAndShareBasedCompensation
/ us-gaap_AwardTypeAxis
= fbio_EmployeeAwardsMember
1,122us-gaap_EmployeeBenefitsAndShareBasedCompensation
/ us-gaap_AwardTypeAxis
= fbio_EmployeeAwardsMember
Non-Employee Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 7us-gaap_EmployeeBenefitsAndShareBasedCompensation
/ us-gaap_AwardTypeAxis
= fbio_NonEmployeeAwardsMember
$ 13us-gaap_EmployeeBenefitsAndShareBasedCompensation
/ us-gaap_AwardTypeAxis
= fbio_NonEmployeeAwardsMember