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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of accounts receivable (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥)
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts Receivable | ¥ 199,843 |  | ¥ 364,863
Allowance for uncollectible receivables | (60,679) |  | (28,014)
Accounts receivable, net | 139,164 | $ 19,990 | 336,849
Current loan products |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts Receivable | 196,148 |  | 364,863
Allowance for uncollectible receivables | (60,444) |  | (28,014)
Accounts receivable, net | 135,704 |  | ¥ 336,849
Other online standard loan products |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts Receivable | 3,695 |  |
Allowance for uncollectible receivables | (235) |  |
Accounts receivable, net | ¥ 3,460 |  |

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