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Amount of Shares of Common Stock Reserved (Detail) - shares
Mar. 31, 2015
Mar. 31, 2014
Jan. 31, 2014
Stock Option Outstanding [Line Items]      
Common stock issued and outstanding 4,863,389    
Conversion of 9% Notes 275,000    
Conversion of 8% Notes 200,000    
Warrants outstanding 914,500 714,500 314,500
Stock options outstanding 776,500 628,700 735,800
Remaining shares issuable under 2013 Equity Incentive Plan 90,000    
Common stock reserved for future issuance 7,119,389