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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, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | ¥ 2,230,176 | $ 320,345 | ¥ 2,881,940 | ¥ 2,250,850
Current loan products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 1,974,380 |  | 2,447,332 | 714,400
Other online standard loan products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 10,217 |  | 116,571 | 778,155
Offline and non-standard loan products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 32,346 |  | 43,494 | 585,744
Other services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 213,233 |  | 274,543 | 172,551
Loan facilitation services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 1,747,065 |  | 2,246,908 | 1,856,584
Loan facilitation services | Current loan products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 1,742,708 |  | 2,245,941 | 678,003
Loan facilitation services | Other online standard loan products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 4,357 |  | 51 | 637,860
Loan facilitation services | Offline and non-standard loan products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 0 |  | 916 | 540,721
Loan facilitation services | Other services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 0 |  |  |
Post-origination services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 267,047 |  | 241,968 | 125,438
Post-origination services | Current loan products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 230,024 |  | 174,370 | 21,067
Post-origination services | Other online standard loan products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 5,854 |  | 26,938 | 60,070
Post-origination services | Offline and non-standard loan products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 31,169 |  | 40,660 | 44,301
Post-origination services | Other services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 0 |  |  |
Other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 216,064 |  | 393,064 | 268,828
Other revenues | Current loan products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 1,648 |  | 27,021 | 15,330
Other revenues | Other online standard loan products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 6 |  | 89,582 | 80,225
Other revenues | Offline and non-standard loan products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 1,177 |  | 1,918 | 722
Other revenues | Other services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | ¥ 213,233 |  | ¥ 274,543 | ¥ 172,551

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