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Revenue Recognition - Product Revenues, Classified by Geographic Location (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Concentration Risk [Line Items]    
Revenues $ 591 $ 1,333
Concentration risk percentage 100.00% 100.00%
Americas [Member]    
Concentration Risk [Line Items]    
Revenues $ 148 $ 235
Concentration risk percentage 25.00% 18.00%
Japan [Member]    
Concentration Risk [Line Items]    
Revenues $ 320 $ 966
Concentration risk percentage 54.00% 72.00%
EMEA [Member]    
Concentration Risk [Line Items]    
Revenues $ 112 $ 132
Concentration risk percentage 19.00% 10.00%
Asia Pacific [Member]    
Concentration Risk [Line Items]    
Revenues $ 11  
Concentration risk percentage 2.00% 0.00%