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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Summary of operating results from continuing operations and assets by business segment |  |  |  |
Revenues | $ 26,411 | $ 29,798 | $ 54,840 | $ 60,626
Operating profit (loss) | 1,386 | 3,437 | 3,448 | 6,283
Asia Pacific |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |
Revenues | 1,950 | 2,438 | 3,763 | 4,693
Operating profit (loss) | (1,165) | (1,233) | (2,706) | (2,282)
Europe |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |
Revenues | 7,897 | 9,457 | 16,968 | 20,015
Operating profit (loss) | 268 | 1,704 | 1,217 | 3,611
North America |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |
Revenues | 16,564 | 17,903 | 34,109 | 35,918
Operating profit (loss) | 2,283 | 2,966 | 4,937 | 4,954
Operating Segments | Asia Pacific |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |
Revenues | 1,963 | 2,401 | 3,807 | 4,651
Operating Segments | Europe |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |
Revenues | 8,005 | 9,638 | 17,223 | 20,279
Operating Segments | North America |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |
Revenues | 16,443 | 17,759 | 33,810 | 35,696
Other | Asia Pacific |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |
Revenues | (13) | 37 | (44) | 42
Other | Europe |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |
Revenues | (108) | (181) | (255) | (264)
Other | North America |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |
Revenues | $ 121 | $ 144 | $ 299 | $ 222

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