Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Details Textual)

v3.19.1
Stockholders' Equity (Details Textual) - USD ($)
 1 Months Ended 12 Months Ended
Jan. 01, 2019
Mar. 31, 2018
Jan. 02, 2018
Dec. 31, 2018
Dec. 31, 2017
Nov. 30, 2017
Jun. 30, 2017
Mar. 17, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common Stock, Shares Authorized       60,000,000        
Common Stock, Shares, Issued       27,076,154 18,512,429      
Equity Method Investment, Annual Equity Fee, Percentage     2.50%         2.50%
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options       $ 3,000,000        
Shelf Registration Statement, Maximum Authorized Securities           $ 100,000,000    
Shelf Registration Statement, Remaining Authorized Securities       69,000,000        
Payments of Stock Issuance Costs       2,184,000 $ 0      
Stock Issued During Period, Value, Common Shares For Services       815,000 0      
Stock Issued During Period Value Common Shares For At The Market Offering       $ 7,747,000        
National Securities Corporation [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Payments of Stock Issuance Costs   $ 1,800,000            
Agent [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Commission rate       3.00%        
Underwritten Public Offering [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock Issued During Period, Value, New Issues   $ 23,000,000            
Shares Issued, Price Per Share   $ 4.35            
Stock Issued During Period, Shares, New Issues   5,290,000            
Proceeds from Issuance Underwritten Public Offering   $ 20,800,000            
Payments of Stock Issuance Costs   $ 2,200,000            
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       2,345,457        
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  
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       1 year 3 months 22 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        
Restricted Stock Units (RSUs) [Member] | Non employee [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       590,866        
Fortress Biotech, Inc [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock Issued During Period, Shares, New Issues 960,428   591,836          
Equity Method Investment, Annual Equity Fee, Percentage 2.50%     2.50%        
Stock Issued During Period, Value, Common Shares For Services       $ 815,000        
Stock Issued During Period, Shares, Common Shares For Services       178,292        
Common Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares Issued, Price Per Share       $ 4.33        
Stock Issued During Period, Value, Common Shares For Services       $ 0 $ 0      
Stock Issued During Period, Shares, Common Shares For Services       770,128 721,699      
Stock Issued During Period Shares Common Shares For At The Market Offering       1,841,774        
Stock Issued During Period Value Common Shares For At The Market Offering       $ 0        
Stock Issued During Period Value Common Shares For At The Market Offering Gross       $ 8,000,000        
Common Class A [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common Stock, Shares Authorized   15,000,000   7,000,000        
Common Stock, Shares, Issued       7,000,000