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- Share-Based Compensation (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense $ 1,968,000 $ 2,175,000 $ 2,115,000 $ 2,708,000  
Accelerated equity compensation cost   1,900,000      
Modification incremental compensation cost   300,000      
Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost $ 259,000   $ 259,000    
Expected weighted-average period in years of compensation cost to be recognized     2 years 2 months 9 days    
Total fair value of shares vested     $ 85,000 5,002,000  
Weighted average estimated fair value of shares granted $ 2.41   $ 2.41   $ 1.72
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost $ 0   $ 0    
Expected weighted-average period in years of compensation cost to be recognized     0 years    
Research and Development [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense 341,000 162,000 $ 381,000 208,000  
General and Administrative [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense 1,627,000 1,262,000 1,734,000 1,611,000  
Discontinued Operations [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense $ 0 $ 751,000 $ 0 $ 889,000