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Amount of Shares of Common Stock Reserved (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2012
Stock Option Outstanding [Line Items] |  |  |  |
Common stock issued and outstanding | 46,952,469 |  |  |
Warrants outstanding | 3,145,000 |  | 2,936,000 | 1,500,000
Stock options outstanding | 7,358,000 |  | 5,300,000 | 1,150,000
Remaining shares issuable under 2013 Equity Incentive Plan | 1,820,000 |  |  |
Common stock reserved for future issuance | 68,207,549 |  |  |
Subsequent Event |  |  |  |
Stock Option Outstanding [Line Items] |  |  |  |
Common stock issued and outstanding | 6,000,000 | [1] |  |
Conversion of 8% Notes |  |  |  |
Stock Option Outstanding [Line Items] |  |  |  |
Conversion of Notes | 182,080 | [2] |  |
Conversion of 9% Notes |  |  |  |
Stock Option Outstanding [Line Items] |  |  |  |
Conversion of Notes | 2,750,000 |  |  |
[1] | Reflects 2,000,000 shares and 4,000,000 warrants issued in March 2014 in connection with an equity investment. See Note 10.
[2] | Reflects shares issued in February 2014 in connection with the conversion of the 8% notes. See Note 10.

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