Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details Textual)

v3.8.0.1
Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended
Mar. 31, 2018
Jan. 02, 2018
Mar. 31, 2018
Mar. 31, 2017
Mar. 12, 2018
Dec. 31, 2017
Nov. 30, 2017
Mar. 17, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common Stock, Shares Authorized 50,000,000   50,000,000     50,000,000    
Common Stock, Par or Stated Value Per Share $ 0.0001   $ 0.0001     $ 0.0001    
Common Stock, Shares, Issued 25,015,088   25,015,088     18,512,429    
Equity Method Investment, Annual Equity Fee, Percentage 2.50%   2.50%         2.50%
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 4,300   $ 4,300          
Shelf Registration Statement, Maximum Authorized Securities             $ 100,000  
Shelf Registration Statement, Remaining Authorized Securities         $ 77,000      
Payments of Stock Issuance Costs     2,167 $ 0        
Stock Issued During Period, Value, Common Shares For Services     $ 641          
Agent [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Commission rate 3.00%   3.00%          
Underwritten Public Offering [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock Issued During Period, Value, New Issues $ 23,000              
Shares Issued, Price Per Share $ 4.35   $ 4.35          
Stock Issued During Period, Shares, New Issues 5,290,000              
Proceeds from Issuance Underwritten Public Offering $ 20,800              
Payments of Stock Issuance Costs $ 2,200              
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 2,486,697   2,486,697          
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 5,000,000   5,000,000          
Non-vested Resricted 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     2 years 7 months 6 days          
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 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   591,836            
Equity Method Investment, Annual Equity Fee, Percentage           2.50%    
Stock Issued During Period, Value, Common Shares For Services     $ 641          
Stock Issued During Period, Shares, Common Shares For Services 132,250              
Common Class A [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common Stock, Shares Authorized 15,000,000   15,000,000          
Common Stock, Shares, Issued 7,000,000   7,000,000     7,000,000    
Stock Issued During Period, Value, Common Shares For Services     $ 0