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

SHARE-BASED COMPENSATION - Option valuation assumptions (Details)

v3.8.0.1
SHARE-BASED COMPENSATION - Option valuation assumptions (Details) - Options
9 Months Ended 12 Months Ended
Dec. 31, 2017
Mar. 31, 2017
Mar. 31, 2016
Assumptions used in the valuation model      
Expected dividend yield (as a percent) 8.70% 0.00% 0.00%
Expected volatility (as a percent) 60.00% 63.00% 50.00%
Expected term 6 years 29 days 6 years 29 days 3 months
Risk-free interest rate (as a percent) 1.96% 1.98% 0.72%