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SHAREHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 10, 2015 | Jan. 27, 2015 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2018 | Dec. 31, 2016 | Dec. 31, 2015
SHAREHOLDERS' EQUITY |  |  |  |  |  |  |  |
Consideration to repurchase shares |  |  |  |  |  |  | $ 4,542 | $ 3,111
Shares repurchased |  |  |  |  |  |  | 967,408 | 614,033
Amount of dividend paid |  |  | $ 0 | $ 0 | $ 0 |  |  |
Ordinary shares |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY |  |  |  |  |  |  |  |
Shares repurchased |  |  |  |  |  |  | 2,902,224 | 1,842,099
ADS |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY |  |  |  |  |  |  |  |
Consideration to repurchase shares | $ 20,000 |  |  |  |  |  |  |
Shares repurchased |  |  | 0 | 0 | 0 |  |  |
ADS | Maximum |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY |  |  |  |  |  |  |  |
Price per share | $ 7.99 |  |  |  |  |  |  |
Common Class A |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY |  |  |  |  |  |  |  |
Conversion of stock, shares converted |  | 45,787,948 |  |  |  | 45,787,948 |  |
Ordinary shares, shares outstanding |  |  | 84,463,737 | 84,463,737 |  |  |  |
Common Class B |  |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY |  |  |  |  |  |  |  |
Conversion of stock, shares issued |  | 45,787,948 |  |  |  |  |  |
Ordinary shares, shares outstanding |  |  | 45,787,948 | 45,787,948 |  |  |  |

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