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Summary of Significant Accounting Policies - Summary of Financial Information of VIE and its Subsidiaries (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Jan. 01, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥)
--- | --- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |  |
Cash and cash equivalents | ¥ 2,324,542 | $ 333,900 |  | ¥ 1,616,164
Restricted cash | 3,686,203 | 529,490 |  | 3,677,557
Short-term investments | 114,560 | 16,456 |  | 1,694,660
Accounts receivable | 882,305 | 126,735 |  | 812,042
Property, equipment and software, net | 134,324 | 19,294 |  | 144,002
Right of use assets | 95,786 | 13,759 | ¥ 127,066 |
Financial guarantee derivative assets |  |  |  | 56,287
Investments | 96,622 |  |  | 81,000
Deferred tax assets | 129,740 | 18,636 |  | 122,763
Contract assets | 20,555 | 2,952 |  | 112,103
Prepaid expenses and other assets | 1,391,023 | 199,806 |  | 221,793
Total assets | 18,304,456 | 2,629,268 |  | 13,142,467
Payable to platform customers | 684,630 | 98,341 |  | 905,034
Payroll and welfare payable | 176,685 | 25,379 |  | 188,254
Taxes payable | 128,298 | 18,429 |  | 225,101
Short-term borrowings | 235,000 | 33,756 |  | 25,000
Contract liabilities | 55,728 | 8,005 |  | 165,469
Deferred tax liabilities | 198,922 | 28,573 |  | 100,064
Leasing liabilities | 85,143 | 12,230 |  |
Amounts due to related parties | 4,309 | 619 |  |
Accrued expenses and other liabilities | 287,625 | 41,315 |  | 222,519
Total liabilities | 10,292,976 | $ 1,478,494 |  | 7,156,729
Beijing Paipairongxin Investment Consulting Co., Ltd [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Cash and cash equivalents | 2,025,233 |  |  | 752,102
Restricted cash | 2,620,706 |  |  | 3,341,985
Short-term investments |  |  |  | 1,574,090
Accounts receivable | 846,454 |  |  | 800,334
Quality assurance receivable | 3,649,642 |  |  | 2,064,366
Property, equipment and software, net | 103,444 |  |  | 104,802
Right of use assets | 94,852 |  |  |
Loans and receivables, net of provision for loan losses | 36,344 |  |  |
Financial guarantee derivative assets |  |  |  | 56,287
Investments | 2,306,831 |  |  | 1,147,569
Deferred tax assets | 122,920 |  |  | 88,446
Contract assets | 20,555 |  |  | 112,103
Prepaid expenses and other assets | 1,290,996 |  |  | 167,817
Total assets | 13,117,977 |  |  | 10,209,901
Payable to platform customers | 684,630 |  |  | 905,034
Quality assurance payable | 4,776,153 |  |  | 3,819,379
Payroll and welfare payable | 115,540 |  |  | 129,809
Taxes payable | 32,468 |  |  | 208,585
Short-term borrowings | 85,000 |  |  |
Contract liabilities | 50,166 |  |  | 158,061
Deferred tax liabilities | 47,117 |  |  | 78,268
Leasing liabilities | 84,284 |  |  |
Amounts due to related parties | 3,189,663 |  |  | 1,609,126
Accrued expenses and other liabilities | 237,802 |  |  | 190,406
Total liabilities | ¥ 9,302,823 |  |  | ¥ 7,098,668

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