Stock-Based Compensation - Summary of Change in Number of Non-Vested Options to Purchase Shares of Common Stock (Detail) (USD $)	9 Months Ended
	Oct. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares, Nonvested, Beginning balance	303,000
Shares, Granted	220,500
Shares, Vested	(228,000)
Shares, Nonvested, Ending balance	295,500
Weighted Average Fair Value, Nonvested, Beginning balance	$ 4.40
Weighted Average Fair Value, Granted	$ 6.60
Weighted Average Fair Value, Vested	$ 3.85
Weighted Average Fair Value, Nonvested, Ending balance	$ 6.47