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Consolidated Balance Sheets and Statements of Operations and Comprehensive Loss Components - Intangible assets (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Intangible assets      
Net Carrying Value $ 139 $ 223 $ 334
Estimated aggregate amortization expense to be recognized in future      
2017 $ 100 100  
2018   $ 100  
Minimum      
Intangible assets      
Life   3 years  
Maximum      
Intangible assets      
Life   7 years  
Patent license      
Intangible assets      
Life 7 years 7 years 7 years
Gross Carrying Amount $ 780 $ 780 $ 780
Accumulated Amortization 641 557 446
Net Carrying Value $ 139 $ 223 $ 334