Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Details)

v3.19.3
Stockholders' Equity - Additional Information (Details)
 3 Months Ended 9 Months Ended
Jan. 01, 2019
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
shares
Dec. 31, 2018
$ / shares
shares
Nov. 30, 2017
USD ($)
Jun. 30, 2017
shares
Mar. 17, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common Stock, Shares Authorized | shares   60,000,000   60,000,000   60,000,000      
Common Stock, Par or Stated Value Per Share | $ / shares   $ 0.0001   $ 0.0001   $ 0.0001      
Common Stock, Shares, Issued | shares   31,166,033   31,166,033   27,076,154      
Equity Method Investment, Annual Equity Fee, Percentage                 2.5
Stock Issued During Period, Value, Common Shares For Services | $   $ 92,000 $ 174,000 $ 198,000 $ 815,000        
Shelf Registration Statement, Maximum Authorized Securities | $             $ 100,000,000    
Shelf Registration Statement, Remaining Authorized Securities | $   61,100,000   61,100,000          
Stock Issued During Period Value Common Shares For At The Market Offering | $   $ 3,341,000 7,747,000 $ 7,709,000 7,747,000        
Agent [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Commission rate   3.00%   3.00%          
2015 Incentive Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares   1,525,805   1,525,805          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       10 years          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares               5,000,000  
Non-vested Restricted Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       1 year          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | $   $ 3,400,000   $ 3,400,000          
Performance Shares [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares   333,334   333,334          
Fortress Biotech, Inc [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock Issued During Period, Shares, New Issues | shares 960,428     55,750          
Equity Method Investment, Annual Equity Fee, Percentage 2.5                
Stock Issued During Period, Value, Common Shares For Services | $       $ 198,000          
Common Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares Issued, Price Per Share | $ / shares   $ 3.54   $ 3.54          
Stock Issued During Period, Value, Common Shares For Services | $   $ 0 $ 0 $ 0 $ 0        
Stock Issued During Period Shares Common Shares For At The Market Offering | shares   1,142,298 1,841,774 2,230,524 1,841,774        
Stock Issued During Period Value Common Shares For At The Market Offering | $   $ 0 $ 0 $ 0 $ 0        
Stock Issued During Period Value Common Shares For At The Market Offering Gross | $       $ 7,900,000          
Common Class A [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common Stock, Shares Authorized | shares   7,000,000   7,000,000          
Common Stock, Shares, Issued | shares           7,000,000