Amount of Shares of Common Stock Reserved (Detail) - shares	Jun. 30, 2015	Mar. 31, 2015
Stock Option Outstanding [Line Items]
Common stock issued and outstanding	4,863,455
Conversion of 9% Notes	275,000
Conversion of 8% Notes	200,000
Warrants outstanding	914,500	914,500
Stock options outstanding	776,500	776,500
Remaining shares issuable under 2013 Equity Incentive Plan	90,000
Common stock reserved for future issuance	7,119,455