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ORGANIZATION AND PRINCIPAL ACTIVITIES - Additional Information (Detail) $ / shares in Units, ¥ in Thousands, $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May 10, 2019 CNY (¥) shares | Dec. 31, 2015 CNY (¥) | Dec. 31, 2019 CNY (¥) shares | Dec. 31, 2019 USD ($) $ / shares shares | May 10, 2019 $ / shares | Dec. 31, 2018 CNY (¥) shares | Dec. 31, 2018 $ / shares
Summary of Organization and Principal Activities [Line Items] |  |  |  |  |  |  |
Contractual consideration net of funds remaining in the investor assurance program |  |  | ¥ 130,722 | $ 18,777 |  |  |
Guarantee liability | ¥ |  |  |  |  |  | ¥ 4,060 |
Shares par value | $ / shares |  |  |  | $ 0.000000005 |  |  |
Common shares, shares issued (in shares) | shares |  |  | 216,100,000 | 216,100,000 |  |  |
Stock issued equivalent common stock shares | shares | 16,100,000 |  |  |  |  |  |
IPO Expenses Capitalization | ¥ | ¥ 234,354 |  |  |  |  |  |
American Depositary Share [Member] |  |  |  |  |  |  |
Summary of Organization and Principal Activities [Line Items] |  |  |  |  |  |  |
Shares issued in initial public offering ("IPO") (in shares) | shares | 4,025,000 |  |  |  |  |  |
Shares issued, price per share | $ / shares |  |  |  |  | $ 10.50 |  |
Common Class A [Member] |  |  |  |  |  |  |
Summary of Organization and Principal Activities [Line Items] |  |  |  |  |  |  |
Shares par value | $ / shares |  |  |  | $ 0.000000005 |  |  | $ 0.000000005
Common shares, shares issued (in shares) | shares |  |  | 100,100,000 | 100,100,000 |  | 84,000,000 |
Shares issued in initial public offering ("IPO") (in shares) | shares |  |  | 16,100,000 |  |  |  |
Common Class B [Member] |  |  |  |  |  |  |
Summary of Organization and Principal Activities [Line Items] |  |  |  |  |  |  |
Shares par value | $ / shares |  |  |  | $ 0.000000005 |  |  | $ 0.000000005
Common shares, shares issued (in shares) | shares |  |  | 116,000,000 | 116,000,000 |  | 116,000,000 |
Shanghai Niwodai Finance Information Co., Ltd. ("Niwodai Finance") |  |  |  |  |  |  |
Summary of Organization and Principal Activities [Line Items] |  |  |  |  |  |  |
Investor assurance fund | ¥ |  | ¥ 136,300 |  |  |  |  |
Shanghai Caiyin Asset Management Co., Ltd. ("Shanghai Caiyin") |  |  |  |  |  |  |
Summary of Organization and Principal Activities [Line Items] |  |  |  |  |  |  |
Total consideration | ¥ |  | 700,000 |  |  |  |  |
Guarantee liability | ¥ |  |  | ¥ 2,900,000 |  |  |  |
Shanghai Caiyin Asset Management Co., Ltd. ("Shanghai Caiyin") | Shanghai Niwodai Finance Information Co., Ltd. ("Niwodai Finance") |  |  |  |  |  |  |
Summary of Organization and Principal Activities [Line Items] |  |  |  |  |  |  |
Contractual consideration net of funds remaining in the investor assurance program | ¥ |  | ¥ 563,700 |  |  |  |  |

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