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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of disaggregation of revenue by product (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥)
Disaggregation Of Revenue [Line Items] |  |  |  |
Net revenue | ¥ 1,300,160 | $ 199,258 | ¥ 2,230,176 | ¥ 2,881,940
Current loan products |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net revenue | 1,055,815 |  | 1,974,380 | 2,447,332
Other online standard loan products |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net revenue |  |  | 10,217 | 116,571
Offline and non-standard loan products |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net revenue |  |  | 32,346 | 43,494
Other services |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net revenue | 244,345 |  | 213,233 | 274,543
Loan facilitation services |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net revenue | 943,084 |  | 1,747,065 | 2,246,908
Loan facilitation services | Current loan products |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net revenue | 943,084 |  | 1,742,708 | 2,245,941
Loan facilitation services | Other online standard loan products |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net revenue |  |  | 4,357 | 51
Loan facilitation services | Offline and non-standard loan products |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net revenue |  |  |  | 916
Post-origination services |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net revenue | 112,731 |  | 267,047 | 241,968
Post-origination services | Current loan products |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net revenue | 112,731 |  | 230,024 | 174,370
Post-origination services | Other online standard loan products |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net revenue |  |  | 5,854 | 26,938
Post-origination services | Offline and non-standard loan products |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net revenue |  |  | 31,169 | 40,660
Other revenues |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net revenue | 244,345 |  | 216,064 | 393,064
Other revenues | Current loan products |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net revenue |  |  | 1,648 | 27,021
Other revenues | Other online standard loan products |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net revenue |  |  | 6 | 89,582
Other revenues | Offline and non-standard loan products |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net revenue |  |  | 1,177 | 1,918
Other revenues | Other services |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net revenue | ¥ 244,345 |  | ¥ 213,233 | ¥ 274,543

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