Quarterly report pursuant to Section 13 or 15(d)

STOCK INCENTIVE PLANS AND SHARE-BASED COMPENSATION - Schedule of Assumptions Used to Valuing Stock Purchase Plan (Details)

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STOCK INCENTIVE PLANS AND SHARE-BASED COMPENSATION - Schedule of Assumptions Used to Valuing Stock Purchase Plan (Details) - Stock purchase plan - $ / shares
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option life (in years) 6 months 6 months 6 months 6 months
Risk-free interest rate 1.13% 0.40% 1.13% 0.40%
Stock price volatility 44.99% 81.88% 44.99% 81.88%
Weighted-average grant date fair value per share (usd per share) $ 2.18 $ 0.23 $ 2.18 $ 0.23