Shareholders' Equity - Common Stock and Preferred Stock - Additional Information (Detail) (Series B Preferred Stock [Member], USD $)	12 Months Ended
Jan. 31, 2015
Series B Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Right to purchase common stock	13,500,000.0
Exercise price	$ 1.75

Exercise price per share or per unit of warrants or rights outstanding.

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)(4))

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

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