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, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares, Nonvested, Beginning balance	388,500
Shares, Granted	228,000
Shares, Vested	(173,000)
Shares, Nonvested, Ending balance	443,500
Weighted Average Fair Value, Nonvested, Beginning balance	$ 5.67
Weighted Average Fair Value, Granted	$ 3.85
Weighted Average Fair Value, Vested	$ 5.29
Weighted Average Fair Value, Nonvested, Ending balance	$ 4.88