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Consolidated Balance Sheets and Statements of Operations and Comprehensive Loss Components - Intangible assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Intangible assets    
Net Carrying Value $ 111 $ 223
Estimated aggregate amortization expense to be recognized in future    
2018 $ 100  
Patent license    
Intangible assets    
Life 7 years 7 years
Gross Carrying Amount $ 780 $ 780
Accumulated Amortization 669 557
Net Carrying Value $ 111 $ 223