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Warrants Outstanding (Detail)
 9 Months Ended
Dec. 31, 2016
$ / shares
shares
Class of Warrant or Right [Line Items]  
Weighted Average Per Share Intrinsic Value, Outstanding | $ / shares $ 3.12
Weighted Average Per Share Intrinsic Value, Granted | $ / shares 0
Weighted Average Per Share Intrinsic Value, Exercised | $ / shares 3.76
Weighted Average Per Share Intrinsic Value, Cancelled | $ / shares 0
Weighted Average Per Share Intrinsic Value, Outstanding | $ / shares $ 3.15
Number of warrants, Outstanding | shares 2,091,166
Number of warrants, Granted | shares 29,000
Number of warrants, Exercised | shares (150,000)
Number of warrants, Cancelled | shares 0
Number of warrants, Outstanding | shares 1,970,166