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ORGANIZATION AND PRINCIPAL ACTIVITIES - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Short-term debt | $ 15,257 | $ 16,630 |
Consolidated VIEs |  |  |
Percentage of net revenue contributed by VIE | 99.00% | 99.40% | 99.30%
Percentage of consolidated total assets contributed by VIE | 90.30% | 93.40% |
Percentage of consolidated total liabilities contributed by VIE | 82.70% | 78.20% |
Consolidated VIEs | WFOE |  |  |
Short-term debt | $ 13,116 | $ 14,630 |

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