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Share-based Compensation - LTIP Share Based Compensation Expense (Details) - LTIP - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation      
Share-based compensation expense $ 2,227,000 $ 3,423,000 $ 1,661,000
Share-based compensation reclassified from liability to additional paid-in capital 1,770,000 451,000 64,000
Share-based compensation recorded as liability 1,235,000 2,241,000  
Unrecognized compensation cost 4,773,000    
Liability      
Share-based Compensation      
Share-based compensation expense 764,000 2,336,000 345,000
Additional Paid-in Capital      
Share-based Compensation      
Share-based compensation expense 1,463,000 1,087,000 1,316,000
Research and development expenses      
Share-based Compensation      
Share-based compensation expense 1,000,000 1,894,000 850,000
Selling and administrative expenses      
Share-based Compensation      
Share-based compensation expense $ 1,227,000 $ 1,529,000 $ 811,000