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Summary of significant accounting policies - Guarantee liabilities and Financial guarantee derivative (Details)	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
Guarantee liabilities and Financial guarantee derivative
Guarantee liabilities	$ 2,510,170	¥ 17,475,303	$ 3,001,839	¥ 20,898,201	¥ 545,169,033	¥ 100,661,452
ZhongAn
Guarantee liabilities and Financial guarantee derivative
Period for compensation in case of default by borrowers	2 days
Xiaoying Housing Loan
Guarantee liabilities and Financial guarantee derivative
Guarantee liabilities	$ 18,672	¥ 129,996	$ 229,895	¥ 1,600,482	¥ 8,688,973	¥ 7,298,609

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Fair value portion of guarantee, including, but not limited to, financial standby letter of credit, fair value guarantee, guarantee of collection of scheduled contractual cash flows from financial assets, and contracts that contingently require the guarantor to make payments or perform services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12201-110248

+ Details

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- Definition

The period for compensation by third party in case of default by borrowers.

+ References

No definition available.

+ Details

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