Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2019
Mar. 12, 2020
Jun. 30, 2019
Document and Entity Information      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Registrant Name Fortress Biotech, Inc.    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Central Index Key 0001429260    
Current Fiscal Year End Date --12-31    
Entity Filer Category Accelerated Filer    
Entity Interactive Data Current Yes    
Trading Symbol FBIO    
Entity Public Float     $ 71,367,503
Entity Common Stock, Shares Outstanding   78,458,755  
Entity Current Reporting Status Yes    
Entity Emerging Growth Company false    
Entity Small Business true    
Entity Shell Company false