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Segment Reporting and Significant Customer Information - Operating Results from Continuing Operations and Assets by Business Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenues from External Customers and Long-Lived Assets    
Revenues $ 30,825 $ 30,884
Operating profit (loss) 4,971 3,657
Asia Pacific    
Revenues from External Customers and Long-Lived Assets    
Revenues 1,665 2,022
Operating profit (loss) (1,635) (1,740)
Europe    
Revenues from External Customers and Long-Lived Assets    
Revenues 10,573 10,280
Operating profit (loss) 2,137 1,966
North America    
Revenues from External Customers and Long-Lived Assets    
Revenues 18,587 18,582
Operating profit (loss) 4,469 3,431
Operating Segments | Asia Pacific    
Revenues from External Customers and Long-Lived Assets    
Revenues 1,635 2,042
Operating Segments | Europe    
Revenues from External Customers and Long-Lived Assets    
Revenues 11,054 10,332
Operating Segments | North America    
Revenues from External Customers and Long-Lived Assets    
Revenues 18,136 18,510
Intersegment revenues (expenses) | Asia Pacific    
Revenues from External Customers and Long-Lived Assets    
Revenues 30 (20)
Intersegment revenues (expenses) | Europe    
Revenues from External Customers and Long-Lived Assets    
Revenues (481) (52)
Intersegment revenues (expenses) | North America    
Revenues from External Customers and Long-Lived Assets    
Revenues $ 451 $ 72