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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Revenues from External Customers and Long-Lived Assets        
Revenues $ 28,184 $ 28,075 $ 59,009 $ 58,959
Operating profit (loss) 2,424 1,078 7,395 4,735
Asia Pacific        
Revenues from External Customers and Long-Lived Assets        
Revenues 1,580 2,064 3,245 4,086
Operating profit (loss) (1,783) (1,472) (3,418) (3,212)
Europe        
Revenues from External Customers and Long-Lived Assets        
Revenues 8,682 8,500 19,255 18,780
Operating profit (loss) 584 441 2,721 2,407
North America        
Revenues from External Customers and Long-Lived Assets        
Revenues 17,922 17,511 36,509 36,093
Operating profit (loss) 3,623 2,109 8,092 5,540
Operating Segments        
Revenues from External Customers and Long-Lived Assets        
Revenues       58,959
Operating Segments | Asia Pacific        
Revenues from External Customers and Long-Lived Assets        
Revenues 1,557 2,073 3,192 4,115
Operating Segments | Europe        
Revenues from External Customers and Long-Lived Assets        
Revenues 9,133 8,527 20,187 18,859
Operating Segments | North America        
Revenues from External Customers and Long-Lived Assets        
Revenues 17,494 17,475 35,630 35,985
Intersegment revenues (expenses) | Asia Pacific        
Revenues from External Customers and Long-Lived Assets        
Revenues 23 (9) 53 (29)
Intersegment revenues (expenses) | Europe        
Revenues from External Customers and Long-Lived Assets        
Revenues (451) (27) (932) (79)
Intersegment revenues (expenses) | North America        
Revenues from External Customers and Long-Lived Assets        
Revenues $ 428 $ 36 $ 879 $ 108