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Amount of Shares of Common Stock Reserved (Detail) - shares
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Stock Option Outstanding [Line Items]      
Common stock issued and outstanding 6,033,518    
Warrants outstanding 1,970,166 2,091,166 914,500
Stock options outstanding 1,165,350 1,064,150 776,500
Shares issuable upon conversion of convertible note 499,000    
Preferred stock 1,666,666    
Common stock reserved for future issuance 11,334,700