Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details Textual)

v3.19.1
Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Feb. 08, 2019
Mar. 31, 2019
Mar. 31, 2018
Nov. 12, 2018
Share-based Compensation   $ 751 $ 350  
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned $ 31,500      
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 5,833,333      
Business Acquisition, Share Price $ 6.00      
Invagen Pharmaceuticals Inc [Member]        
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned $ 31,500     $ 215,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 5,833,333      
Business Acquisition, Share Price $ 6.00      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 33.30%      
2015 Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   2,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Description and Terms   10 years    
Restricted Stock [Member]        
Share-based Compensation   $ 800 $ 400  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options   $ 2,300    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   1 year 8 months 12 days