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Stock-Based Compensation Arrangements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Stock-based compensation    
Stock-based compensation costs before income taxes $ 266 $ 782
Research and development    
Stock-based compensation    
Stock-based compensation costs before income taxes 72 305
General and administrative    
Stock-based compensation    
Stock-based compensation costs before income taxes $ 194 $ 477