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
Dec. 30, 2016
shares
Jan. 07, 2008
shares
Aug. 31, 2017
$ / shares
shares
Jan. 31, 2017
$ / shares
shares
Apr. 30, 2015
Dec. 31, 2017
$ / shares
shares
Mar. 31, 2017
$ / shares
shares
Mar. 31, 2016
CNY (¥)
Oct. 31, 2007
shares
Apr. 30, 2005
shares
Options                    
SHARE-BASED COMPENSATION                    
Granted (in shares)           50,000 900,000      
Granted (in dollars per share) | $ / shares           $ 2.35 $ 1.71      
Additional exercise period         6 months          
Additional compensation expense due to modifications | ¥               ¥ 1,635,726    
Options | Employees and officers                    
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)       900,000            
Granted (in dollars per share) | $ / shares       $ 1.705            
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)     50,000              
Granted (in dollars per share) | $ / shares     $ 2.35              
Non-vested shares                    
SHARE-BASED COMPENSATION                    
Non-vested shares granted             2,700,000      
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            
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 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       6,063,070        
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 rate at the end of each year from the grant date over 4 years (as a percent)           25.00%        
Vesting period           4 years