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Income taxes - Movement of the valuation allowance (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2019
CNY (¥)
Income taxes        
Balance at the beginning of the year $ 57,984 ¥ 403,674 ¥ 3,838  
(Addition)/Reverse 639,387 4,451,281 399,836  
Balance at the end of the year 697,371 ¥ 4,854,955 403,674  
Operating loss carryforwards, net $ 808,952   46,845,223 ¥ 5,631,764
Withholding tax rate on dividends (as a percent) 10.00% 10.00%    
Withholding tax rate on dividends if investors qualifies as beneficial owner with holdings above the threshold percentage (as a percent) 5.00% 5.00%    
Threshold beneficial owner percentage determining withholding income tax rate (as a percent) 25.00% 25.00%    
Withholding tax rate on dividends if investors qualifies as beneficial owner with holdings below the threshold percentage (as a percent) 10.00% 10.00%    
Cumulative profits $ 334,274,955     2,327,155,384
Unrecognized deferred tax liabilities 33,427,495     232,715,538
Tax effects of distribution of VIE's earnings     46,419,145 0
Subsidiaries and VIEs and subsidiaries of the VIEs        
Income taxes        
Operating loss carryforwards, net $ 5,600,578   ¥ 188,212,704 ¥ 38,990,106