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Segment Reporting and Significant Customer Information - Assets by Segment (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Revenue for each segment recognized based on customer location    
Long-lived assets $ 5,418 $ 6,158
Total assets 45,840 53,530
Elimination    
Revenue for each segment recognized based on customer location    
Long-lived assets 0 0
Total assets (68,712) (66,851)
Asia Pacific | Operating Segments    
Revenue for each segment recognized based on customer location    
Long-lived assets 181 209
Total assets 4,055 5,295
Europe | Operating Segments    
Revenue for each segment recognized based on customer location    
Long-lived assets 655 763
Total assets 47,398 49,125
North America | Operating Segments    
Revenue for each segment recognized based on customer location    
Long-lived assets 4,582 5,186
Total assets $ 63,099 $ 65,961