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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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Revenues from External Customers and Long-Lived Assets        
Revenues $ 25,505 $ 25,301 $ 84,514 $ 84,260
Operating profit (loss) 1,214 714 8,609 5,449
Asia Pacific        
Revenues from External Customers and Long-Lived Assets        
Revenues 1,673 1,987 4,918 6,073
Operating profit (loss) (2,051) (1,600) (5,469) (4,812)
Europe        
Revenues from External Customers and Long-Lived Assets        
Revenues 8,494 8,378 27,749 27,158
Operating profit (loss) 815 940 3,536 3,347
North America        
Revenues from External Customers and Long-Lived Assets        
Revenues 15,338 14,936 51,847 51,029
Operating profit (loss) 2,450 1,374 10,542 6,914
Operating Segments        
Revenues from External Customers and Long-Lived Assets        
Revenues       84,260
Operating Segments | Asia Pacific        
Revenues from External Customers and Long-Lived Assets        
Revenues 1,630 1,977 4,822 6,092
Operating Segments | Europe        
Revenues from External Customers and Long-Lived Assets        
Revenues 9,432 8,396 29,619 27,255
Operating Segments | North America        
Revenues from External Customers and Long-Lived Assets        
Revenues 14,443 14,928 50,073 50,913
Intersegment revenues (expenses) | Asia Pacific        
Revenues from External Customers and Long-Lived Assets        
Revenues 43 10 96 (19)
Intersegment revenues (expenses) | Europe        
Revenues from External Customers and Long-Lived Assets        
Revenues (938) (18) (1,870) (97)
Intersegment revenues (expenses) | North America        
Revenues from External Customers and Long-Lived Assets        
Revenues $ 895 $ 8 $ 1,774 $ 116