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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of movement of accounts receivable (Detail) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Opening balance | ¥ 364,863 |
Addition in the current year | 2,403,504 | ¥ 1,521,549
Collection in the current year | (2,456,553) | (1,133,270)
Write off in the current year | (111,971) | (23,416)
Ending balance | 199,843 | 364,863
Current loan products |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Opening balance | 364,863 |
Addition in the current year | 2,398,006 | 1,517,277
Collection in the current year | (2,454,752) | (1,128,998)
Write off in the current year | (111,969) | (23,416)
Ending balance | 196,148 | 364,863
Other online standard loan products |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Addition in the current year | 5,498 | 2
Collection in the current year | (1,801) | (2)
Write off in the current year | (2) |
Ending balance | ¥ 3,695 |
Offline and non-standard loan products |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Addition in the current year |  | 18
Collection in the current year |  | (18)
Other services |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Addition in the current year |  | 4,252
Collection in the current year |  | ¥ (4,252)

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- Definition Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 + Details
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