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ORDINARY SHARES - Additional Information (Details) ¥ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
May 10, 2019 CNY (¥) shares | Dec. 31, 2019 $ / shares shares | Dec. 31, 2018 $ / shares shares | May 10, 2019 $ / shares | Dec. 31, 2017 $ / shares shares
Common shares, par value (in dollars per share) | $ / shares |  | $ 0.000000005 |  |  |
Common shares, shares outstanding (in shares) |  | 216,100,000 |  |  |
Ordinary shares split ratio |  |  | 20,000 |  |
Stock sale price | $ / shares |  |  |  | $ 10.50 |
IPO Expenses Capitalization | ¥ | ¥ 234,354 |  |  |  |
Common Class A [Member] |  |  |  |  |
Common shares, shares issued (in shares) |  | 10,000,000,000,000 | 10,000,000,000,000 |  |
Common shares, par value (in dollars per share) | $ / shares |  | $ 0.000000005 | $ 0.000000005 |  |
Common shares, shares outstanding (in shares) |  | 100,100,000 | 84,000,000 |  |
Common Stock, Shares, Issued |  | 100,100,000 | 84,000,000 |  |
Stock issued during period |  | 16,100,000 |  |  |
Common Class B [Member] |  |  |  |  |
Common shares, shares issued (in shares) |  | 10,000,000,000,000 | 10,000,000,000,000 |  |
Common shares, par value (in dollars per share) | $ / shares |  | $ 0.000000005 | $ 0.000000005 |  |
Common shares, shares outstanding (in shares) |  | 116,000,000 | 116,000,000 |  |
Common Stock, Shares, Issued |  | 116,000,000 | 116,000,000 |  |
ADS [Member] |  |  |  |  |
Stock issued during period | 4,025,000 |  |  |  |
Common Stock [Member] |  |  |  |  |
Stock issued during period | 16,100,000 |  |  |  |
Jiayin Group Inc and Subsidiaries |  |  |  |  |
Common shares, shares issued (in shares) |  |  |  |  | 500,000,000
Common shares, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.0001
Common shares, shares outstanding (in shares) |  |  |  |  | 10,000
Common Stock, Shares, Issued |  |  |  |  | 10,000

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