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v3.21.1

RELATED PARTY TRANSACTIONS - Summary of transactions with and amounts due from and due to related parties (Parenthetical) (Detail) ¥ in Thousands, $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 22, 2020 CNY (¥) | Sep. 30, 2020 CNY (¥) | Dec. 31, 2020 CNY (¥) Instalment | Dec. 31, 2020 USD ($) Instalment | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2019 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Lump-sum cash payment |  |  | ¥ 37,372 | $ 5,728 |  | ¥ 11,550 |
Business combination under common control |  |  | 3,000 |  |  |  |
Additional Paid-In Capital [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Business combination under common control |  |  | 3,000 |  |  |  |
Loans To Related Parties |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Loans to related parties |  |  | 542 |  | ¥ 123,947 | ¥ 11,550 |
Subsidiary Director | Loans To Related Parties |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Loans to related parties |  |  | ¥ 79 |  |  |  |
Interest rate on loan receivable |  |  | 6.00% | 6.00% |  |  |
Number of loan instalments | Instalment |  |  | 36 | 36 |  |  |
China Smartpay |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Interest rate on loan receivable |  |  |  |  | 9.00% |  | 9.00%
Loans |  |  |  |  | ¥ 119,924 |  | $ 17,225
Interest receivable |  | ¥ 7,570 |  |  | ¥ 4,938 |  |
Lump-sum cash payment |  | ¥ 37,372 |  |  |  |  |
SG Fintech Joint Stock Company |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Interest rate on loan receivable |  |  |  |  | 0.50% |  | 0.50%
Loans |  |  |  |  | ¥ 598 |  | $ 86
Interest receivable |  |  |  |  | 1 |  |
SG Fintech Joint Stock Company | Shanghai Zhundian Enterprise Service Co., Ltd [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Net assets | ¥ 3,000 |  |  |  |  |  |
SG Fintech Joint Stock Company | Shanghai Zhundian Enterprise Service Co., Ltd [Member] | Additional Paid-In Capital [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Business combination under common control | ¥ 3,000 |  |  |  |  |  |
SG Fintech Joint Stock Company | Loans To Related Parties |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Loans to related parties |  |  |  |  | ¥ 598 |  |

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