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Revenue Recognition - Product Revenues, Classified by Geographic Location (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Concentration Risk [Line Items]        
Revenues $ 467 $ 731 $ 2,027 $ 3,190
Concentration risk percentage 100.00% 100.00% 100.00% 100.00%
Americas [Member]        
Concentration Risk [Line Items]        
Revenues $ 112 $ 79 $ 315 $ 670
Concentration risk percentage 24.00% 11.00% 15.00% 21.00%
Japan [Member]        
Concentration Risk [Line Items]        
Revenues $ 279 $ 575 $ 1,434 $ 2,232
Concentration risk percentage 60.00% 79.00% 71.00% 70.00%
EMEA [Member]        
Concentration Risk [Line Items]        
Revenues $ 18 $ 76 $ 204 $ 281
Concentration risk percentage 4.00% 10.00% 10.00% 9.00%
Asia Pacific [Member]        
Concentration Risk [Line Items]        
Revenues $ 58 $ 1 $ 74 $ 7
Concentration risk percentage 12.00% 0.00% 4.00% 0.00%