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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 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Summary of operating results from continuing operations and assets by business segment                      
Revenues $ 27,062 $ 25,301 $ 28,075 $ 30,884 $ 26,997 $ 24,687 $ 26,411 $ 28,429 $ 111,322 $ 106,524 $ 114,263
Operating income (loss) $ 2,789 $ 714 $ 1,078 $ 3,657 $ 1,079 $ 18 $ 1,386 $ 2,062 8,238 4,545 10,186
Intersegment Eliminations                      
Summary of operating results from continuing operations and assets by business segment                      
Revenues                 0 0 0
Operating income (loss)                 0 0 0
Asia Pacific                      
Summary of operating results from continuing operations and assets by business segment                      
Revenues                 7,859 7,519 9,698
Operating income (loss)                 (6,322) (5,967) (3,890)
Asia Pacific | Intersegment Eliminations                      
Summary of operating results from continuing operations and assets by business segment                      
Revenues                 (10) (34) 73
Asia Pacific | Operating Segments                      
Summary of operating results from continuing operations and assets by business segment                      
Revenues                 7,869 7,553 9,625
Europe                      
Summary of operating results from continuing operations and assets by business segment                      
Revenues                 36,149 33,681 36,907
Operating income (loss)                 4,973 2,290 5,604
Europe | Intersegment Eliminations                      
Summary of operating results from continuing operations and assets by business segment                      
Revenues                 (319) (353) (595)
Europe | Operating Segments                      
Summary of operating results from continuing operations and assets by business segment                      
Revenues                 36,468 34,034 37,502
North America                      
Summary of operating results from continuing operations and assets by business segment                      
Revenues                 67,314 65,324 67,658
Operating income (loss)                 9,587 8,222 8,472
North America | Intersegment Eliminations                      
Summary of operating results from continuing operations and assets by business segment                      
Revenues                 329 387 522
North America | Operating Segments                      
Summary of operating results from continuing operations and assets by business segment                      
Revenues                 $ 66,985 $ 64,937 $ 67,136