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Segment Information - Net Sales by Market (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 197,563 | $ 287,728 | $ 264,860
United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 3,348 | 4,100 | 3,246
Canada |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,938 | 1,809 | 2,746
PERU |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 508 | 0 | 0
Hong Kong |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 174,926 | 263,482 | 245,737
China |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 7,282 | 9,086 | 4,425
Taiwan |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 5,591 | 6,213 | 5,965
South Korea |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 466 | 691 | 1,129
Commonwealth of Independent States (Russia, Kazakhstan and Ukraine) |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 913 | 858 | 1,139
Europe [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 2,278 | 1,234 | 382
Other foreign countries |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 313 | $ 255 | $ 91

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