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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Summary of operating results from continuing operations and assets by business segment |  |  |  |
Revenues | $ 24,687 | $ 26,823 | $ 79,527 | $ 87,450
Operating profit (loss) | 18 | 1,875 | 3,466 | 8,158
Asia Pacific |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |
Revenues | 1,773 | 2,557 | 5,536 | 7,251
Operating profit (loss) | (1,679) | (798) | (4,385) | (3,080)
Europe |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |
Revenues | 7,946 | 8,474 | 24,914 | 28,490
Operating profit (loss) | 309 | 1,412 | 1,526 | 5,022
North America |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |
Revenues | 14,968 | 15,792 | 49,077 | 51,709
Operating profit (loss) | 1,388 | 1,261 | 6,325 | 6,216
Operating Segments | Asia Pacific |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |
Revenues | 1,767 | 2,521 | 5,574 | 7,173
Operating Segments | Europe |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |
Revenues | 8,008 | 8,614 | 25,231 | 28,893
Operating Segments | North America |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |
Revenues | 14,912 | 15,688 | 48,722 | 51,384
Other | Asia Pacific |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |
Revenues | 6 | 36 | (38) | 78
Other | Europe |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |
Revenues | (62) | (140) | (317) | (403)
Other | North America |  |  |  |
Summary of operating results from continuing operations and assets by business segment |  |  |  |
Revenues | $ 56 | $ 104 | $ 355 | $ 325

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