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

SHARE-BASED COMPENSATION - Expense (Details)

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SHARE-BASED COMPENSATION - Expense (Details) - Options - CNY (¥)
9 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Mar. 31, 2017
SHARE-BASED COMPENSATION      
Total-share based compensation expense ¥ 3,103,243 ¥ 2,253,210 ¥ 3,949,371
Total unrecognized compensation expense   ¥ 2,353,574  
Weighted average period over which unrecognized compensation expense is expected to be recognized   3 years 6 months 15 days  
Research and development      
SHARE-BASED COMPENSATION      
Total-share based compensation expense 476,994 ¥ 157,355 113,499
Sales and marketing      
SHARE-BASED COMPENSATION      
Total-share based compensation expense 272,568 70,915 64,856
General and administrative      
SHARE-BASED COMPENSATION      
Total-share based compensation expense ¥ 2,353,681 ¥ 2,024,940 ¥ 3,771,016