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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Summary of operating results from continuing operations and assets by business segment                      
Revenues $ 26,997 $ 24,687 $ 26,411 $ 28,429 $ 26,814 $ 26,823 $ 29,798 $ 30,828 $ 106,524 $ 114,263 $ 123,961
Operating income (loss) $ 1,079 $ 18 $ 1,386 $ 2,062 $ 2,028 $ 1,875 $ 3,437 $ 2,846 4,545 10,186 3,820
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                 7,519 9,698 10,649
Operating income (loss)                 (5,967) (3,890) (2,469)
Asia Pacific | Intersegment Eliminations                      
Summary of operating results from continuing operations and assets by business segment                      
Revenues                 (34) 73 (12)
Asia Pacific | Operating Segments                      
Summary of operating results from continuing operations and assets by business segment                      
Revenues                 7,553 9,625 10,661
Europe                      
Summary of operating results from continuing operations and assets by business segment                      
Revenues                 33,681 36,907 39,736
Operating income (loss)                 2,290 5,604 2,472
Europe | Intersegment Eliminations                      
Summary of operating results from continuing operations and assets by business segment                      
Revenues                 (353) (595) (131)
Europe | Operating Segments                      
Summary of operating results from continuing operations and assets by business segment                      
Revenues                 34,034 37,502 39,867
North America                      
Summary of operating results from continuing operations and assets by business segment                      
Revenues                 65,324 67,658 73,576
Operating income (loss)                 8,222 8,472 3,817
North America | Intersegment Eliminations                      
Summary of operating results from continuing operations and assets by business segment                      
Revenues                 387 522 143
North America | Operating Segments                      
Summary of operating results from continuing operations and assets by business segment                      
Revenues                 $ 64,937 $ 67,136 $ 73,433