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Income taxes - Unrecognized tax benefit (Details) - 12 months ended Dec. 31, 2019	USD ($)	CNY (¥)	CNY (¥)
Roll-forward of unrecognized tax benefits
Additions for tax positions	$ 45,851,126	¥ 319,206,371
Reductions for tax position	(10,458,755)	(72,811,764)
Balance at end of the year	35,392,371	246,394,607
Accrued interest	546,692		¥ 3,805,963
Tax impact arising from impairment losses and charge-offs of accounts receivable and contract assets	19,833,495	138,076,827
Tax impact related to the provision for contingent guarantee liabilities	$ 26,017,631	¥ 181,129,544

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
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- Definition

Amount of decrease in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of interest expense accrued for an underpayment of income taxes.

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Amount of increase in unrecognized tax benefits resulting from impairment losses and charge-offs of accounts receivable and contract assets .

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Amount of increase in unrecognized tax benefits resulting from provision for contingent guarantee liabilities.

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