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ORDINARY SHARES (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 25, 2019 shares | Sep. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2018 CNY (¥) shares | Dec. 31, 2019 $ / shares shares | Dec. 31, 2018 $ / shares shares | Dec. 31, 2016 shares | Dec. 31, 2015 shares | Dec. 31, 2017 shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares authorized (in shares) |  | 1,000,000,000 |  |  |  |  |  |
Dividends | $ |  | $ 50 |  |  |  |  |  |
Ordinary shares Class A |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares authorized (in shares) |  |  |  | 800,000,000 | 800,000,000 |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares |  |  |  | $ 0.00005 | $ 0.00005 |  |  |
Ordinary shares, outstanding |  |  |  | 92,120,024 | 91,088,106 |  |  |
Common stock, shares, issued, not outstanding (in shares) |  |  |  | 2,982,220 |  |  |  |
Ordinary shares Class B |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares authorized (in shares) |  |  |  | 72,000,000 | 72,000,000 |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares |  |  |  | $ 0.00005 | $ 0.00005 |  |  |
Ordinary shares, outstanding |  |  |  | 72,000,000 | 72,000,000 |  |  |
Ordinary shares Class C | Gold Prized |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Subscription receivable | ¥ |  |  | ¥ 2,200 |  |  |  |  |
Ordinary Shares | Ordinary shares Class A |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares authorized (in shares) |  | 800,000,000 |  |  |  |  |  | 72,000,000
Common Stock, Par or Stated Value Per Share | $ / shares |  | $ 0.00005 |  |  |  |  |  |
Shares issued | 5,500,000 | 15,969,110 |  |  | 15,969,110 |  |  |
Ordinary shares issued |  |  |  | 2,517,780 |  |  |  |
Ordinary shares, outstanding |  |  |  | 92,120,024 | 91,088,106 | 72,000,000 |  | 72,000,000
Conversion of preferred shares into Class A ordinary shares upon IPO (in shares) |  | 75,118,996 |  |  | 75,118,996 |  |  |
Issuance of ordinary shares upon initial public offering ("IPO"), net of issuance costs of RMB19,134 (in shares) | 5,500,000 | 15,969,110 |  |  | 15,969,110 |  |  |
Re-designation of Class A ordinary shares into Class B ordinary shares (Note 13) (in shares) |  | 72,000,000 |  |  | (72,000,000) |  |  |
Ordinary Shares | Ordinary shares Class B |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares authorized (in shares) |  | 72,000,000 |  |  |  |  |  | 839,209,895
Common Stock, Par or Stated Value Per Share | $ / shares |  | $ 0.00005 |  |  |  |  |  |
Ordinary shares, outstanding |  |  |  | 72,000,000 | 72,000,000 |  |  |
Re-designation of Class A ordinary shares into Class B ordinary shares (Note 13) (in shares) |  |  |  |  | 72,000,000 |  |  |
Ordinary Shares | Ordinary shares Class C |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares authorized (in shares) |  | 128,000,000 |  |  |  |  |  | 13,671,109
Common Stock, Par or Stated Value Per Share | $ / shares |  | $ 0.00005 |  |  |  |  |  |
Ordinary Shares | Ordinary shares Class C | Gold Prized |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares issued |  |  |  |  |  | 1,607,901 | 1,607,901 |
Issuance of ordinary shares upon initial public offering ("IPO"), net of issuance costs of RMB19,134 (in shares) |  |  |  |  |  | 1,607,901 | 1,607,901 |
Number of Surrendered Shares |  |  | 1,607,901 |  |  |  |  |
Equity Incentive Plan | Ordinary shares Class A |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Ordinary shares issued |  |  |  | 2,517,780 |  |  |  |
Ordinary shares, outstanding |  |  |  | 2,517,780 |  |  |  |

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