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ORDINARY SHARES (Details) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 30, 2017 Vote | Nov. 05, 2015 USD ($) shares | Sep. 30, 2017 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 18, 2018 USD ($) | Nov. 24, 2017 USD ($) | Dec. 31, 2016 $ / shares shares
ORDINARY SHARES |  |  |  |  |  |  |  |
Ordinary shares, shares authorized (in shares) |  |  |  | 99,999,999 | 99,999,999 |  |  | 99,999,999
Ordinary shares, par value (in dollars per share) | $ / shares |  |  |  | $ 0.001 | $ 0.001 |  |  | $ 0.001
Proceeds from initial public offering | $ |  |  |  |  | $ 94,627 |  |  |
Issuance cost, net | $ |  |  |  |  | 4,492 |  |  |
Payment of initial public offering costs | $ |  |  |  | $ 1,377 | $ 3,073 |  |  |
Ordinary shares, shares issued (in shares) |  |  |  | 29,213,801 | 29,213,801 |  |  |
Ordinary shares, shares outstanding (in shares) |  |  |  | 29,213,801 | 29,213,801 |  |  |
Class A Ordinary Shares |  |  |  |  |  |  |  |
ORDINARY SHARES |  |  |  |  |  |  |  |
Ordinary shares, par value (in dollars per share) | $ / shares |  |  | $ 0.001 |  |  |  |  |
Ordinary shares re-designated (in shares) |  | 10,115,854 |  |  |  |  |  |
Ordinary shares issued (in shares) |  |  | 5,500,000 |  |  |  |  |
Number of votes each share is entitled | Vote | 1 |  |  |  |  |  |  |
Proceeds from initial public offering | $ |  |  | $ 94,627 |  |  |  |  |
Conversion of ordinary shares |  |  | 3,253,870 |  |  |  |  |
Conversion ratio of ordinary shares | 1 |  | 1 |  |  |  |  |
Class B Ordinary Shares |  |  |  |  |  |  |  |
ORDINARY SHARES |  |  |  |  |  |  |  |
Number of votes each share is entitled | Vote | 10 |  |  |  |  |  |  |
Conversion of ordinary shares |  |  | 9,352,676 |  |  |  |  |
Conversion ratio of ordinary shares |  |  | 1 |  |  |  |  |
American depositary shares |  |  |  |  |  |  |  |
ORDINARY SHARES |  |  |  |  |  |  |  |
Share repurchase program, authorized amount | $ |  |  |  |  |  | $ 12,000 | $ 50,000 |
RYB Education Limited | Class B Ordinary Shares |  |  |  |  |  |  |  |
ORDINARY SHARES |  |  |  |  |  |  |  |
Ordinary shares issued (in shares) |  | 13,047,947 |  |  |  |  |  |
Total proceeds from issuance of ordinary shares | $ |  | $ 50,224 |  |  |  |  |  |

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