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Revenue Recognition - Product Revenues, Classified by Geographic Location (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Concentration Risk [Line Items]    
Revenues $ 731 $ 591
Concentration risk percentage 100.00% 100.00%
Americas [Member]    
Concentration Risk [Line Items]    
Revenues $ 45 $ 148
Concentration risk percentage 6.00% 25.00%
Japan [Member]    
Concentration Risk [Line Items]    
Revenues $ 578 $ 320
Concentration risk percentage 79.00% 54.00%
EMEA [Member]    
Concentration Risk [Line Items]    
Revenues $ 90 $ 112
Concentration risk percentage 12.00% 19.00%
Asia Pacific [Member]    
Concentration Risk [Line Items]    
Revenues $ 18 $ 11
Concentration risk percentage 3.00% 2.00%