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SEGMENT REPORTING (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 segment | Dec. 31, 2015 segment
Segment reporting |  |  |  |  |
Number of operating segments | segment |  |  |  | 2 | 1
Product sales | $ 243,626 | $ 227,539 | $ 319,881 |  |
Cost of revenues | 146,029 | 166,343 | 214,261 |  |
Total | 243,626 | 227,539 | 319,881 |  |
Cost of Product Sales | 146,029 | 166,343 | 214,261 |  |
Gross profit | 97,597 | 61,196 | 105,620 |  |
Unallocated operating expenses | 113,649 | 98,677 | 115,787 |  |
Loss from operations | (16,052) | (37,481) | (10,167) |  |
Foreign Currency Transaction Gain (Loss), Unrealized | 129 | (339) | (89) |  |
Interest income | 297 | 487 | 581 |  |
Interest expense | (66) | (5) |  |  |
Change in fair value of convertible promissory notes | 14,591 | (22,791) |  |  |
Other income, net | 283 |  |  |  |
Loss before income taxes and gain from equity method investment | (947) | (59,790) | (9,675) |  |
Product sales |  |  |  |  |
Segment reporting |  |  |  |  |
Product sales | 236,705 | 216,407 | 293,951 |  |
Cost of revenues | 144,061 | 156,326 | 189,816 |  |
Total | 236,705 | 216,407 | 293,951 |  |
Cost of Product Sales | 144,061 | 156,326 | 189,816 |  |
Gross profit | 92,644 | 60,081 | 104,135 |  |
Service and others |  |  |  |  |
Segment reporting |  |  |  |  |
Product sales | 6,921 | 11,132 | 25,930 |  |
Cost of revenues | 1,968 | 10,017 | 24,445 |  |
Total | 6,921 | 11,132 | 25,930 |  |
Cost of Product Sales | 1,968 | 10,017 | 24,445 |  |
Gross profit | $ 4,953 | $ 1,115 | $ 1,485 |  |

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