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Stock-Based Compensation - Summary of Change in Number of Non-Vested Options to Purchase Shares of Common Stock (Detail) (USD $)	3 Months Ended
	Apr. 30, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares, Nonvested, Beginning balance	303,000
Shares, Granted	180,500
Shares, Vested	(71,000)
Shares, Nonvested, Ending balance	412,500
Weighted Average Fair Value, Nonvested, Beginning balance	$ 4.40
Weighted Average Fair Value, Granted	$ 6.28
Weighted Average Fair Value, Vested	$ 3.27
Weighted Average Fair Value, Nonvested, Ending balance	$ 5.42

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(1)

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

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- Definition

Number of non-vested options outstanding.

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- Definition

Weighted average grant-date fair value of non-vested options outstanding.

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Number of options vested.

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Weighted average grant-date fair value of options vested.

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