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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Summary of operating results from continuing operations and assets by business segment        
Revenues $ 28,075 $ 26,411 $ 58,959 $ 54,840
Operating profit (loss) 1,078 1,386 4,735 3,448
Asia Pacific        
Summary of operating results from continuing operations and assets by business segment        
Revenues 2,064 1,950 4,086 3,763
Operating profit (loss) (1,472) (1,165) (3,212) (2,706)
Europe        
Summary of operating results from continuing operations and assets by business segment        
Revenues 8,500 7,897 18,780 16,968
Operating profit (loss) 441 268 2,407 1,217
North America        
Summary of operating results from continuing operations and assets by business segment        
Revenues 17,511 16,564 36,093 34,109
Operating profit (loss) 2,109 2,283 5,540 4,937
Operating Segments        
Summary of operating results from continuing operations and assets by business segment        
Revenues     58,959 54,840
Operating Segments | Asia Pacific        
Summary of operating results from continuing operations and assets by business segment        
Revenues 2,073 1,963 4,115 3,807
Operating Segments | Europe        
Summary of operating results from continuing operations and assets by business segment        
Revenues 8,527 8,005 18,859 17,223
Operating Segments | North America        
Summary of operating results from continuing operations and assets by business segment        
Revenues 17,475 16,443 35,985 33,810
Elimination | Asia Pacific        
Summary of operating results from continuing operations and assets by business segment        
Revenues (9) (13) (29) (44)
Elimination | Europe        
Summary of operating results from continuing operations and assets by business segment        
Revenues (27) (108) (79) (255)
Elimination | North America        
Summary of operating results from continuing operations and assets by business segment        
Revenues $ 36 $ 121 $ 108 $ 299