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Segment Reporting and Significant Customer Information - Assets by Segment (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Revenue for each segment recognized based on customer location    
Long-lived assets $ 3,790 $ 4,921
Total assets 43,424 45,672
Intersegment Eliminations    
Revenue for each segment recognized based on customer location    
Long-lived assets 0 0
Total assets (85,762) (72,864)
Asia Pacific | Operating Segments    
Revenue for each segment recognized based on customer location    
Long-lived assets 145 140
Total assets 3,811 3,697
Europe | Operating Segments    
Revenue for each segment recognized based on customer location    
Long-lived assets 313 496
Total assets 62,942 54,593
North America | Operating Segments    
Revenue for each segment recognized based on customer location    
Long-lived assets 3,332 4,285
Total assets $ 62,433 $ 60,246