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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 31, 2018 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2019 USD ($) | Jul. 30, 2019
Shareholders' deficit |  | ¥ (741,854,000) |  | ¥ (1,652,006,000) |  | $ (106,561) |
Net income |  | 527,747,000 | $ 75,805 | 611,758,000 | ¥ 539,545,000 |  |
Net cash used in the operating activities |  | 26,291,000 | $ 3,777 | (228,368,000) | 104,752,000 |  |
Cash and cash equivalents |  | ¥ 122,149,000 |  | ¥ 41,441,000 | ¥ 606,097,000 | $ 17,546 |
VIEs percentage of Group's consolidated revenue |  | 96.00% | 96.00% | 100.00% | 100.00% |  |
VIEs percentage of consolidated total assets |  | 52.00% | 52.00% | 100.00% |  |  |
VIEs percentage of consolidated total liabilities |  | 95.00% | 95.00% | 100.00% |  |  |
Convenience translation rate per US$1.00 |  | 6.9618 |  |  |  | 6.9618 |
Value added tax rate |  |  |  | 6.00% |  |  |
Value added tax amount |  | ¥ 168,763,000 |  | ¥ 298,720,000 | ¥ 273,785,000 |  |
Service fees |  | ¥ 174,191,000 |  | ¥ 242,513,000 | ¥ 156,563,000 |  |
Weighted average investment period |  | 8 months 9 days | 8 months 9 days | 8 months | 8 months 21 days |  |
Remaining performance obligations |  | ¥ 137,313,000 |  | ¥ 222,735,000 |  |  |
Remaining performance obligations, percentage that will be recognized by the Group over the following 12 months |  | 100.00% |  | 92.00% |  | 100.00% |
Advertising expenses |  | ¥ 26,985,000 |  | ¥ 25,994,000 | ¥ 21,828,000 |  |
Government grants |  | 18,722,000 |  | 22,465,000 | 12,471,000 |  |
Minimum operating lease commitements |  | 50,682,000 |  | 50,682,000 |  |  |
Employee defined contribution plan expense |  | ¥ 65,076,000 |  | 51,611,000 | 82,053,000 |  |
Percentage of ownership interest |  | 20.00% |  |  |  | 20.00% |
Current portion of lease liabilities |  | ¥ 2,735,000 |  |  |  |  |
Weighted average discount rate |  | 4.75% |  |  |  | 4.75% |
Right-of-use assets |  | ¥ 37,215,000 |  |  |  |  |
Lease liabilities |  | 35,215,000 |  |  |  |  |
Deferred Revenue |  | 55,689,000 |  | ¥ 41,252,000 | ¥ 0 |  |
Weighted average expected net accumulative loss rates |  |  |  | 11.20% | 13.40% |  |
SG Fintech Joint Stock Company |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired |  |  |  |  |  |  | 24.90%
Investment income, net |  | ¥ 378,000 |  |  |  |  |
Cash and Cash Equivalents [Member] | CHINA |  |  |  |  |  |  |
Concentration risk, percentage |  | 64.00% | 64.00% |  |  |  |
Cash and Cash Equivalents [Member] | Overseas |  |  |  |  |  |  |
Concentration risk, percentage |  | 36.00% | 36.00% |  |  |  |
Exclusive Purchase Agreement Member [Member] | Shanghai Kunjia Technology Co., Ltd. ("Shanghai Kunjia" or "WFOE") [Member] |  |  |  |  |  |  |
Consideration of purchase |  | ¥ 1 |  |  |  |  |
Effective time period of agreement |  | 10 years | 10 years |  |  |  |
Post-origination service |  |  |  |  |  |  |
Contract liability revenue recognised |  | ¥ 4,902,000 |  |  |  |  |
Remaining performance obligations |  | ¥ 182,026,000 |  | ¥ 222,735,000 | ¥ 171,000,000 |  |
Remaining performance obligations, percentage that will be recognized by the Group over the following 12 months |  | 100.00% |  | 92.00% | 70.00% | 100.00% |
Deferred Revenue, Revenue Recognized |  | ¥ 41,252,000 |  |  |  |  |
Post-origination service | Accrued Liabilities |  |  |  |  |  |  |
Contract liabilities |  | 0 |  |  |  |  |
Post-origination service | Other Current Liabilities |  |  |  |  |  |  |
Contract liabilities |  |  |  | ¥ 41,252,000 |  |  |
China United SME Guarantee Corporation |  |  |  |  |  |  |
Unsecured loans facilitated subject to investor assurance program |  | ¥ 2,544,000,000 |  | ¥ 1,233,000,000 |  |  |
Percentage of total loan volume facilitated |  | 14.00% | 14.00% | 5.00% |  |  |
Shenzhen Rongxinbao Non-financial Guarantee Co., Ltd. |  |  |  |  |  |  |
Unsecured loans facilitated subject to investor assurance program |  | ¥ 15,661,000,000 |  | ¥ 11,082,000,000 |  |  |
Percentage of total loan volume facilitated |  | 86.00% | 86.00% | 47.00% |  |  |
Selective unrelated third party individual investors |  |  |  |  |  |  |
Investment amount | ¥ 1,000,000 |  |  |  |  |  |
Unsecured loans facilitated subject to investor assurance program |  | ¥ 2,727,000,000 |  | ¥ 2,727,000,000 |  |  |
Percentage of total loan volume facilitated |  | 12.00% | 12.00% | 12.00% |  |  |
Payment Guarantee [Member] |  |  |  |  |  |  |
Guarantee obligations |  | ¥ 487,216,000 |  |  |  |  |
CNY |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | ¥ 41,441,000 |  |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |
Unsecured loans facilitated subject to investor assurance program |  |  |  | ¥ 8,632,000,000 |  |  |
Percentage of total loan volume facilitated |  |  |  | 36.00% |  |  |
Equity Pledge Agreement |  |  |  |  |  |  |
Percentage of equity interest in Jiayin Finance pledged to WFOE |  | 100.00% | 100.00% |  |  |  |

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