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

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash, cash equivalents and short term loan (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash, cash equivalents and short term loan (Details)
1 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Mar. 31, 2017
CNY (¥)
Jul. 31, 2018
CNY (¥)
Cash, cash equivalents, restricted cash and short term loan            
Net cash received from financing activities   ¥ (70,148,709) $ (138,156,351) ¥ (949,893,989) ¥ 37,249,603  
ATA Testing | Commercial Loan Facility (the "Facility")            
Cash, cash equivalents, restricted cash and short term loan            
Pledge agreement period 3 years          
Interest rate (as a percent) 6.525%          
Drawdowns           ¥ 15,000,000
ATA Testing | Commercial Loan Facility (the "Facility") | Jack Huang            
Cash, cash equivalents, restricted cash and short term loan            
Term of commercial loan facility 3 years          
Maximum borrowing capacity | $ $ 15,000,000          
ASU 2016-18 | Adjustment            
Cash, cash equivalents, restricted cash and short term loan            
Restricted cash   30,000,000     30,000,000  
Net cash received from financing activities   ¥ 30,000,000     ¥ (30,000,000)