Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

DESCRIPTION OF BUSINESS, ORGANIZATION AND SIGNIFICANT CONCENTRATIONS AND RISKS - Accounts Receivable Concentration (Details)

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DESCRIPTION OF BUSINESS, ORGANIZATION AND SIGNIFICANT CONCENTRATIONS AND RISKS - Accounts Receivable Concentration (Details)
Dec. 31, 2017
USD ($)
Mar. 31, 2017
CNY (¥)
Dec. 31, 2017
CNY (¥)
Significant Concentrations and Risks      
Accounts receivable, net $ 15,385,861 ¥ 56,161,255 ¥ 100,105,027
Accounts receivable | Credit concentration risk, customers or financial institutions | The Chinese Institute of Certified Public Accountants      
Significant Concentrations and Risks      
Accounts receivable, net   ¥ 450,712 15,537,954
Percentage of concentration of risk 15.50% 0.80%  
Accounts receivable | Credit concentration risk, customers or financial institutions | Asset Management Association of China      
Significant Concentrations and Risks      
Accounts receivable, net   ¥ 10,836,559 ¥ 15,714,552
Percentage of concentration of risk 15.70% 19.30%