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Warrants Outstanding (Detail)
 3 Months Ended
Jun. 30, 2017
$ / shares
shares
Class of Warrant or Right [Line Items]  
Weighted Average Per Share Intrinsic Value, Outstanding | $ / shares $ 4.68
Weighted Average Per Share Intrinsic Value, Granted | $ / shares 0
Weighted Average Per Share Intrinsic Value, Exercised | $ / shares 0
Weighted Average Per Share Intrinsic Value, Cancelled | $ / shares 0
Weighted Average Per Share Intrinsic Value, Outstanding | $ / shares $ 6.41
Number of warrants, Outstanding | shares 1,970,166
Number of warrants, Granted | shares 0
Number of warrants, Exercised | shares 0
Number of warrants, Cancelled | shares 0
Number of warrants, Outstanding | shares 1,970,166