Acquired Intangible Assets - Carrying Value of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Cost	$ 3,543	$ 3,543
Accumulated Amortization	(798)	(447)
Net Book Value	2,745	3,096
Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	3,505	3,505
Accumulated Amortization	(760)	(409)
Net Book Value	2,745	3,096
Access to Facilities Contract [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	38	38
Accumulated Amortization	$ (38)	$ (38)