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SEGMENT REPORTING - Summary of revenues and percentage of revenues by geographical locations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment reporting |  |  |
Total product sales revenues | $ 243,626 | $ 227,539 | $ 319,881
Total revenues |  |  |
Segment reporting |  |  |
Revenues (as a percent) | 100.00% | 100.00% | 100.00%
Europe |  |  |
Segment reporting |  |  |
Total product sales revenues | $ 87,586 | $ 109,781 | $ 153,697
Europe | Total revenues |  |  |
Segment reporting |  |  |
Revenues (as a percent) | 36.00% | 48.20% | 48.10%
France |  |  |
Segment reporting |  |  |
Total product sales revenues | $ 18,012 | $ 22,900 | $ 34,693
North America |  |  |
Segment reporting |  |  |
Total product sales revenues | $ 37,932 | $ 51,206 | $ 73,339
North America | Total revenues |  |  |
Segment reporting |  |  |
Revenues (as a percent) | 15.60% | 22.50% | 22.90%
United States |  |  |
Segment reporting |  |  |
Total product sales revenues | $ 29,794 | $ 40,148 | $ 60,810
Other countries |  |  |
Segment reporting |  |  |
Total product sales revenues | $ 118,108 | $ 66,552 | $ 92,845
Other countries | Total revenues |  |  |
Segment reporting |  |  |
Revenues (as a percent) | 48.40% | 29.30% | 29.00%

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