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Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Schedule of Investments | The following table sets forth the investments the Group holds as of December 31, 2018 and 2019 respectively.
|  | As of December 31, |
|  | 2018 |  |  | 2019 |
Equity method investments |  |  | 81,000 |  |  |  | 96,622 |
Non-marketable equity investments |  |  | 86,501 |  |  |  | 856,211 |
|  |  | 167,501 |  |  |  | 952,833 |
Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis | The following table sets forth the Group’s assets and liabilities that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy:
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Level 1 Inputs |  |  | Level 2 Inputs |  |  | Level 3 Inputs |  |  | Balance at Fair value |
|  | RMB |  |  | RMB |  |  | RMB |  |  | RMB |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
—wealth management products |  |  | — |  |  |  | 1,694,660 |  |  |  | — |  |  |  | 1,694,660 |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
—non-marketable equity investments |  |  | — |  |  |  | — |  |  |  | 86,501 |  |  |  | 86,501 |
Financial guarantee derivative assets |  |  | — |  |  |  | — |  |  |  | 56,287 |  |  |  | 56,287 |
Total Assets |  |  | — |  |  |  | 1,694,660 |  |  |  | 142,788 |  |  |  | 1,837,448 |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Level 1 Inputs |  |  | Level 2 Inputs |  |  | Level 3 Inputs |  |  | Balance at Fair value |
|  | RMB |  |  | RMB |  |  | RMB |  |  | RMB |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
—wealth management products |  |  | — |  |  |  | 114,560 |  |  |  | — |  |  |  | 114,560 |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
—non-marketable equity investments |  |  | — |  |  |  | — |  |  |  | 856,211 |  |  |  | 856,211 |
Total Assets |  |  | — |  |  |  | 114,560 |  |  |  | 856,211 |  |  |  | 970,771 |
Summary of Significant Unobservable Inputs used for Fair Value Measurement of Financial Guarantee Derivatives | The following table sets forth the significant unobservable inputs used for fair value measurement of financial guarantee derivatives:
|  | As of December 31, |
|  | 2018 |  |  | 2019 |
Expected default rate |  |  | 0.46% - 12.37% |  |  | N/A |
Summary of Movement of Non-Marketable Investments | The following table sets forth the movement of non-marketable investments measured using Level 3 valuation techniques:
|  | For the years ended December 31, |
|  | 2018 |  |  | 2019 |
Opening balance |  |  | — |  |  |  | 86,501 |
Purchase of non-marketable investments |  |  | 86,578 |  |  |  | 771,218 |
Disposal of non-marketable investments |  |  | — |  |  |  | (1,508 | )
Fair value change |  |  | (77 | ) |  |  | — |
Ending balance |  |  | 86,501 |  |  |  | 856,211 |
Schedule of Interest Income, Interest Expense and Loan Provision Losses Related to Loans | The net interest income recor ded in the consolidated statement of comprehensive income related to the loans originated by the Group recorded for the years ended December 31, 2017, 2018 and 2019 are as follows:
|  | For the Years Ended December 31, |
|  | 2017 |  |  | 2018 |  |  | 2019 |
|  | RMB |  |  | RMB |  |  | RMB |
Interest income |  |  | 46,975 |  |  |  | 316,193 |  |  |  | 1,342,289 |
Less: Interest expense |  |  | (15,598 | ) |  |  | (60,085 | ) |  |  | (235,620 | )
Net interest income |  |  | 31,377 |  |  |  | 256,108 |  |  |  | 1,106,669 |
Schedule of Estimated Useful Life and Residual Value of Property and Equipment, Net | The following table sets forth the estimated useful life and residual value:
Category |  | Estimated useful life |  | Residual value |
Office furniture and equipment |  | 3- 5 years |  |  | 5% |
Computer and electronic equipment |  | 3- 5 years |  |  | 5% |
Leasehold improvements |  | shorter of remaining lease period or estimated useful life |  |  | Nil |
Software |  | 1- 5 years |  |  | Nil |
Schedule of Guarantee and Quality Assurance Fund Obligations Movement Activities | The following table sets forth the Group’s quality assurance obligations movement activities for the years ended December 31, 2017, 2018 and 2019:
|  | For the years ended December 31, |
|  | 2017 |  |  | 2018 |  |  | 2019 |
Opening balance |  |  | 473,704 |  |  |  | 2,062,844 |  |  |  | 3,819,379 |
Fair value of newly written guarantee and quality assurance obligation |  |  | 3,318,432 |  |  |  | 5,313,489 |  |  |  | 6,156,826 |
Release of guarantee and quality assurance payable upon repayment |  |  | (2,506,141 | ) |  |  | (4,049,457 | ) |  |  | (6,718,809 | )
Contingent liability |  |  | 2,527,209 |  |  |  | 3,380,930 |  |  |  | 6,409,884 |
Payouts during the year |  |  | (4,812,797 | ) |  |  | (7,889,277 | ) |  |  | (12,299,134 | )
Recoveries during the year |  |  | 3,062,437 |  |  |  | 5,000,850 |  |  |  | 7,408,007 |
Ending balance |  |  | 2,062,844 |  |  |  | 3,819,379 |  |  |  | 4,776,153 |
Schedule of Quality and Assurance Fund Receivable Movement Activities | The following table sets forth the Group’s quality assurance receivables movement activities for the years ended December 31, 2017, 2018 and 2019:
|  | For the years ended December 31, |
|  | 2017 |  |  | 2018 |  |  | 2019 |
Opening balance |  |  | 286,812 |  |  |  | 1,152,769 |  |  |  | 2,064,366 |
Fair value of newly written guarantee and quality assurance obligation |  |  | 3,318,432 |  |  |  | 5,313,489 |  |  |  | 6,156,826 |
Guarantee fee and quality assurance obligation contribution received from borrowers |  |  | (2,479,428 | ) |  |  | (4,244,259 | ) |  |  | (6,070,412 | )
Gain (loss) from quality assurance |  |  | 26,953 |  |  |  | (157,633 | ) |  |  | (210,520 | )
Fair value of early repaid investment program * |  |  | — |  |  |  | — |  |  |  | 1,709,382 |
Ending balance |  |  | 1,152,769 |  |  |  | 2,064,366 |  |  |  | 3,649,642 |
* Since November 2019, th e Company early repaid investors of certain investment programs before maturity of the investment program due to our decision to discontinue our online lending information intermediary business. This is regarded as an advance to the borrowers, which resulted in an increase in quality assurance receivable. The initial recognition of such quality assurance relievable was based on best estimate of future cash receipt of the underlying loans.
Schedule of Financial Guarantee Derivative Movement Activities | The following table sets forth the Group’s financial guarantee derivative movement activities for the years ended December 31, 2017, 2018 and 2019.
|  | For the years ended December 31, |
|  | 2017 |  |  | 2018 |  |  | 2019 |
Opening balance |  |  | 167,291 |  |  |  | (215,770 | ) |  |  | 56,287 |
Initial recognition of and change in fair value of ongoing investor reserve arrangements |  |  | (213,958 | ) |  |  | 114,813 |  |  |  | (24,843 | )
Settlement upon maturity of investor reserve arrangements |  |  | (169,103 | ) |  |  | 157,244 |  |  |  | (31,444 | )
Ending balance |  |  | (215,770 | ) |  |  | 56,287 |  |  |  | — |
Schedule of Revenue Initial Application Period Cumulative Effect Transition | The following table sets forth the impact to the consolidated statement of comprehensive income for the years ended December 31, 2018 as a result of adoption of ASC Topic 606.
|  | For the years ended December 31, 2018 |
|  | As reported |  |  | Amounts without adoption of ASC Topic 606 |  |  | Effect of change |
Loan facilitation service fees |  |  | 2,919,234 |  |  |  | 2,141,565 |  |  |  | 777,669 |
Post-facilitation service fees |  |  | 922,797 |  |  |  | 773,116 |  |  |  | 149,681 |
Other Revenue |  |  | 376,915 |  |  |  | 793,188 |  |  |  | (416,273 | )
|  |  | 4,218,946 |  |  |  | 3,707,869 |  |  |  | 511,077 |
Disaggregation of Revenue | The following table set s forth the Group’s operating revenue from different service type:
|  | For the year ended December 31, |
|  | 2018 |  |  | 2019 |
|  | With quality assurance protection |  |  | Without quality assurance protection |  |  | With quality assurance protection |  |  | Without quality assurance protection |
Loan facilitation service fees |  |  | 2,404,178 |  |  |  | 515,056 |  |  |  | 2,984,063 |  |  |  | 326,812 |
Post-facilitation service fees |  |  | 678,518 |  |  |  | 244,279 |  |  |  | 1,096,660 |  |  |  | 103,713 |
Other revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- investment management fee |  |  | 208,471 |  |  |  | — |  |  |  | 109,423 |  |  |  | — |
- borrowers referral fee |  |  | — |  |  |  | 96,167 |  |  |  | — |  |  |  | 130,677 |
- others |  |  | 54,734 |  |  |  | 17,543 |  |  |  | 37,949 |  |  |  | 66,791 |
Changes in expected discretionary payment to IRF investors |  |  | — |  |  |  | 68,619 |  |  |  | — |  |  |  | — |
|  |  | 3,345,901 |  |  |  | 941,664 |  |  |  | 4,228,095 |  |  |  | 627,993 |
Beijing Paipairongxin Investment Consulting Co., Ltd [Member] |
Summary of Financial Information of VIE and its Subsidiaries | The following table sets forth the assets, liabilities, results of operations and cash flows of the VIEs, which are included in the Group’s consolidated financial statements. Transactions between the VIEs and their subsidiaries are eliminated in the balances presented below:
|  | As of December 31, |
|  | 2018 |  |  | 2019 |
|  | RMB |  |  | RMB |
Cash and cash equivalents |  |  | 752,102 |  |  |  | 2,025,233 |
Restricted cash |  |  | 3,341,985 |  |  |  | 2,620,706 |
Short-term investments |  |  | 1,574,090 |  |  |  | — |
Account s receivable |  |  | 800,334 |  |  |  | 846,454 |
Quality assurance receivable |  |  | 2,064,366 |  |  |  | 3,649,642 |
Property, equipment and software, net |  |  | 104,802 |  |  |  | 103,444 |
Right of Use assets |  |  | — |  |  |  | 94,852 |
Loans and receivables, net of provision for loan losses |  |  | — |  |  |  | 36,344 |
Financial guarantee derivative assets |  |  | 56,287 |  |  |  | — |
Investments |  |  | 1,147,569 |  |  |  | 2,306,831 |
Deferred tax assets |  |  | 88,446 |  |  |  | 122,920 |
Contract assets |  |  | 112,103 |  |  |  | 20,555 |
Prepaid expenses and other assets |  |  | 167,817 |  |  |  | 1,290,996 |
Total assets |  |  | 10,209,901 |  |  |  | 13,117,977 |
Payable to platform customers |  |  | 905,034 |  |  |  | 684,630 |
Quality assurance payable |  |  | 3,819,379 |  |  |  | 4,776,153 |
Payroll and welfare payable |  |  | 129,809 |  |  |  | 115,540 |
Taxes payable |  |  | 208,585 |  |  |  | 32,468 |
Short-term borrowings |  |  | — |  |  |  | 85,000 |
Contract liabilities |  |  | 158,061 |  |  |  | 50,166 |
Deferred tax liabilities |  |  | 78,268 |  |  |  | 47,117 |
Leasing liabilities |  |  | — |  |  |  | 84,284 |
Amounts d ue to related parties |  |  | 1,609,126 |  |  |  | 3,189,663 |
Accrued expenses and other liabilities |  |  | 190,406 |  |  |  | 237,802 |
Total liabilities |  |  | 7,098,668 |  |  |  | 9,302,823 |
|  | For the Years Ended December 31, |
|  | 2017 |  |  | 2018 |  |  | 2019 |
|  | RMB |  |  | RMB |  |  | RMB |
Net revenue |  |  | 3,900,454 |  |  |  | 4,250,978 |  |  |  | 4,684,436 |
Net profit |  |  | 730,855 |  |  |  | 1,604,530 |  |  |  | 661,808 |
Net cash provided by operating activities |  |  | 3,233,966 |  |  |  | 1,356,887 |  |  |  | 74,977 |
Net cash provided by (used in) investing activities |  |  | (1,642,454 | ) |  |  | (1,031,968 | ) |  |  | 367,903 |
Net cash provided by (used in) financing activities |  |  | (31,250 | ) |  |  | 1,043,899 |  |  |  | 108,972 |
Net increase in cash, cash equivalents and restricted cash |  |  | 1,560,262 |  |  |  | 1,368,818 |  |  |  | 551,852 |
Cash, cash equivalents and restricted cash at beginning of year |  |  | 1,165,007 |  |  |  | 2,725,269 |  |  |  | 4,094,087 |
Cash, cash equivalents and restricted cash at end of year |  |  | 2,725,269 |  |  |  | 4,094,087 |  |  |  | 4,645,939 |

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