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Segment Reporting and Significant Customer Information - Assets by Segment (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Revenue for each segment recognized based on customer location    
Long-lived assets $ 2,982 $ 3,790
Total assets 54,538 43,424
Intersegment Eliminations    
Revenue for each segment recognized based on customer location    
Long-lived assets 0 0
Total assets (90,084) (85,762)
Asia Pacific | Operating Segments    
Revenue for each segment recognized based on customer location    
Long-lived assets 121 145
Total assets 3,215 3,811
Europe | Operating Segments    
Revenue for each segment recognized based on customer location    
Long-lived assets 263 313
Total assets 74,604 62,942
North America | Operating Segments    
Revenue for each segment recognized based on customer location    
Long-lived assets 2,598 3,332
Total assets $ 66,803 $ 62,433