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Information about Geographic Areas (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
segment
Mar. 31, 2016
USD ($)
Concentration Risk [Line Items]    
Number of reporting segment | segment 1  
Revenues $ 25,533 $ 29,003
Revenue | China    
Concentration Risk [Line Items]    
Concentration risk percent 10.00% 11.00%
Revenues $ 2,400 $ 3,300