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Balance Sheet Detail - Schedule of Identifiable Intangible Assets (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Intangible assets    
Net Carrying Value $ 28 $ 111
Patent license    
Intangible assets    
Life 7 years 7 years
Gross Carrying Amount $ 780 $ 780
Accumulated Amortization 752 669
Net Carrying Value $ 28 $ 111