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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of disaggregation of revenue by product (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
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