Amount of Shares of Common Stock Reserved (Detail)	9 Months Ended
Oct. 31, 2013	Jan. 31, 2013
Stock Option Outstanding [Line Items]
Common stock issued and outstanding	37,977,607
Warrants outstanding	3,145,000	2,936,000
Stock options outstanding	7,235,000	5,300,000
Remaining shares issuable under 2013 Equity Incentive Plan	2,410,000
Conversion of Notes	65,001,368
Conversion of 10% Notes
Stock Option Outstanding [Line Items]
Conversion of Notes	10,883,761
Conversion of 8% Notes
Stock Option Outstanding [Line Items]
Conversion of Notes	600,000
Conversion of 9% Notes
Stock Option Outstanding [Line Items]
Conversion of Notes	2,750,000

Common Shares Issued And Outstanding

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- Definition

Common Stock Issuable Upon Conversion Of Convertible Senior Notes

+ References

No definition available.

+ Details

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- Details

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- Definition

Number of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Article 4

+ Details

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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