Warrants for Preferred Stock - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended			12 Months Ended
	Jul. 06, 2012	Jul. 03, 2012	Jun. 08, 2012	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Class of Warrant or Right [Line Items]
Exercise price of warrants issued				$ 0.94
Fair value of warrants				$ 1,049
Warrant term						10 years	9 years
Reverse stock split			1-for-6.5
Exercise price of common stock				$ 6.11
Preferred stock converted into common stock and warrants		183,076
Marked to market on the fair value of the warrants, gain		165
Warrant fair value reclassified to additional paid-in capital		$ 1,324			$ 1,324
Cashless exercise warrants, purchase	161,538
Net issuance of common stock	67,268
Warrants as-converted basis, shares outstanding				21,538	21,538
Warrants [Member]
Class of Warrant or Right [Line Items]
Dividend yield				0.00%
Warrants [Member] | Minimum [Member]
Class of Warrant or Right [Line Items]
Fair value assumptions expected volatility rate, warrants				54.92%
Risk-free interest rate				1.83%
Warrants [Member] | Maximum [Member]
Class of Warrant or Right [Line Items]
Fair value assumptions expected volatility rate, warrants				55.73%
Risk-free interest rate				3.36%
Series G Preferred Stock [Member]
Class of Warrant or Right [Line Items]
Warrants to purchase shares of stock				1,190,000