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SEGMENT INFORMATION - Company's Operating Information by Geographic Areas (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |
Net sales | $ 77,614 | $ 191,910
Income (loss) from operations | (7,023) | 33,732
Other income, net | 1,426 | 789
Income (loss) before income taxes | (5,597) | 34,521
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Income (loss) from operations | 7,505 | 48,276
Unallocated corporate expenses |  |
Segment Reporting Information [Line Items] |  |
Income (loss) from operations | (14,528) | (14,544)
Primary Reporting Segment |  |
Segment Reporting Information [Line Items] |  |
Net sales | 73,693 | 183,298
Primary Reporting Segment | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Income (loss) from operations | 9,339 | 45,851
China |  |
Segment Reporting Information [Line Items] |  |
Net sales | 2,941 | 7,744
China | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Income (loss) from operations | (1,719) | 2,579
Russia and Kazakhstan |  |
Segment Reporting Information [Line Items] |  |
Net sales | 980 | 868
Russia and Kazakhstan | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Income (loss) from operations | $ (115) | $ (154)

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