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

SHARE-BASED COMPENSATION - Non vested shares expense (Details)

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SHARE-BASED COMPENSATION - Non vested shares expense (Details) - Non-vested shares - CNY (¥)
9 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Mar. 31, 2017
SHARE-BASED COMPENSATION      
Total-share based compensation expense ¥ 3,682,812 ¥ 7,456,157 ¥ 964,953
Total unrecognized compensation expense   ¥ 8,427,757  
Weighted average period over which unrecognized compensation expense is expected to be recognized   2 years 6 months 26 days  
Research and development      
SHARE-BASED COMPENSATION      
Total-share based compensation expense 516,339 ¥ 240,441 118,906
Sales and marketing      
SHARE-BASED COMPENSATION      
Total-share based compensation expense 258,170 96,058 59,453
General and administrative      
SHARE-BASED COMPENSATION      
Total-share based compensation expense ¥ 2,908,303 ¥ 7,119,658 ¥ 786,594