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

SHARE-BASED COMPENSATION - Share incentive plans (Details)

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SHARE-BASED COMPENSATION - Share incentive plans (Details)
1 Months Ended 9 Months Ended 12 Months Ended
Oct. 26, 2018
shares
Dec. 30, 2016
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Jan. 07, 2008
shares
Dec. 31, 2018
shares
Nov. 30, 2018
$ / shares
shares
Jul. 31, 2018
shares
Aug. 31, 2017
$ / shares
shares
Jan. 31, 2017
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Dec. 31, 2017
CNY (¥)
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Dec. 31, 2018
$ / shares
shares
Dec. 31, 2018
CNY (¥)
shares
Mar. 31, 2017
$ / shares
shares
Mar. 31, 2017
CNY (¥)
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Mar. 31, 2016
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Oct. 31, 2007
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Apr. 30, 2005
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SHARE-BASED COMPENSATION                                  
Compensation costs accelerated and recognized | ¥                       ¥ 877,321          
ATA Online                                  
SHARE-BASED COMPENSATION                                  
Compensation costs accelerated and recognized | ¥                       ¥ 6,753,771          
Options                                  
SHARE-BASED COMPENSATION                                  
Granted (in shares)                   50,000   1,053,150   900,000      
Granted (in dollars per share) | $ / shares                 $ 2.35   $ 0.58   $ 1.71        
Total-share based compensation expense | ¥                   ¥ 3,103,243   ¥ 2,253,210   ¥ 3,949,371      
Number of share options       1,142,212         2,377,067 2,377,067 1,142,212 1,142,212 2,451,067 2,451,067 1,904,067    
Options cancelled (in shares)         1,772,584             1,901,752          
Vested cancelled (in shares)         1,215,114                        
Options | ATA Online                                  
SHARE-BASED COMPENSATION                                  
Options cancelled (in shares)           129,168                      
Options | Employees and officers                                  
SHARE-BASED COMPENSATION                                  
Vesting rate on the first anniversary (as a percent)         25.00%     25.00%                  
Vesting rate for remaining awards after the first anniversary and over 36 months (as a percent)         75.00%     75.00%                  
Vesting period for remaining 75% shares         36 months     36 months                  
Granted (in shares)       1,772,584 690,000     900,000                  
Granted (in dollars per share) | $ / shares         $ 0.578     $ 1.705                  
Vested immediately on the grant date (in shares)       1,412,336                          
Options | Employee                                  
SHARE-BASED COMPENSATION                                  
Vesting rate on the first anniversary (as a percent)             25.00%                    
Vesting rate for remaining awards after the first anniversary and over 36 months (as a percent)             75.00%                    
Vesting period for remaining 75% shares             36 months                    
Granted (in shares)         363,150   50,000                    
Granted (in dollars per share) | $ / shares             $ 2.35                    
Options | Certain employee and officer                                  
SHARE-BASED COMPENSATION                                  
Vesting period         4 years                        
Share options issued (in shares)         1,452,600                        
Non-vested shares                                  
SHARE-BASED COMPENSATION                                  
Non-vested shares granted                       2,572,584   2,700,000      
Total-share based compensation expense | ¥                   ¥ 3,682,812   ¥ 7,456,157   ¥ 964,953      
Nonvested cancelled (in shares)         557,470 1,262,250                      
Non-vested shares | ATA Online                                  
SHARE-BASED COMPENSATION                                  
Nonvested cancelled (in shares)           1,262,250                      
Non-vested shares | Employees and officers                                  
SHARE-BASED COMPENSATION                                  
Non-vested shares granted               2,700,000                  
Vesting rate at the end of each year from the grant date over 4 years (as a percent)               25.00%                  
Vesting period               4 years                  
Non-vested shares | Directors                                  
SHARE-BASED COMPENSATION                                  
Vesting rate on the first anniversary (as a percent)         25.00%                        
Vesting rate for remaining awards after the first anniversary and over 36 months (as a percent)         75.00%                        
Vesting period for remaining 75% shares         36 months                        
Non-vested shares granted         800,000                        
2005 Share incentive plan                                  
SHARE-BASED COMPENSATION                                  
Shares authorized                               3,310,300 2,894,000
2005 Share incentive plan | Options                                  
SHARE-BASED COMPENSATION                                  
Expiration term                       10 years          
Vesting rate on the first anniversary (as a percent)                       25.00%          
Vesting rate for remaining awards after the first anniversary and over 36 months (as a percent)                       75.00%          
Vesting period for remaining 75% shares                       36 months          
2008 Share incentive plan                                  
SHARE-BASED COMPENSATION                                  
Shares authorized   5,726,763 336,307                            
Annual increase in shares reserved (as a percent)     1.00%                            
Annual increase in shares reserved (in shares)     336,307                            
Expiration term   10 years 10 years                            
2008 Share incentive plan | Options                                  
SHARE-BASED COMPENSATION                                  
Expiration term                       10 years          
Vesting rate on the first anniversary (as a percent)                       25.00%          
Vesting rate for remaining awards after the first anniversary and over 36 months (as a percent)                       75.00%          
Vesting period for remaining 75% shares                       36 months          
2008 Share incentive plan | Non-vested shares                                  
SHARE-BASED COMPENSATION                                  
Vesting period for remaining 75% shares                       36 months          
Vesting rate at the end of each year from the grant date over 4 years (as a percent)                       25.00%          
Vesting period                       4 years          
Amendment and Restatement of 2008 Plan                                  
SHARE-BASED COMPENSATION                                  
Annual increase in shares reserved (as a percent) 1.00%                                
Common shares reserved for issuance 6,965,846                                
Second Amendment and Restatement of 2008 Plan]                                  
SHARE-BASED COMPENSATION                                  
Common shares reserved for issuance       6,965,846             6,965,846 6,965,846