Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Details)

v3.19.2
Stockholders' Equity - Additional Information (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 01, 2019
shares
Jul. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
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     29,960,034 29,960,034   27,076,154      
Equity Method Investment, Annual Equity Fee, Percentage                 2.5
Stock Issued During Period, Value, Common Shares For Services | $     $ 97,000 $ 106,000 $ 641,000        
Shelf Registration Statement, Maximum Authorized Securities | $             $ 100,000,000    
Shelf Registration Statement, Remaining Authorized Securities | $     61,500,000 61,500,000          
Stock Issued During Period Value Common Shares For At The Market Offering | $   $ 3,000,000 $ 4,013,000 $ 4,368,000          
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     1,534,805 1,534,805          
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 2 months 12 days          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | $     $ 4,200,000 $ 4,200,000          
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     27,195          
Equity Method Investment, Annual Equity Fee, Percentage 2.5                
Stock Issued During Period, Value, Common Shares For Services | $       $ 106,000          
Common Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares Issued, Price Per Share | $ / shares   $ 3.06 $ 4.12 $ 4.12          
Stock Issued During Period, Value, Common Shares For Services | $     $ 0 $ 0 $ 0        
Stock Issued During Period Shares Common Shares For At The Market Offering | shares   1,001,485 997,957 1,088,226          
Stock Issued During Period Value Common Shares For At The Market Offering | $     $ 0 $ 0          
Stock Issued During Period Value Common Shares For At The Market Offering Gross | $   $ 3,100,000   $ 4,500,000          
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