Acquired Intangible Assets - Carrying Value of Intangible Assets (Detail) - USD ($) $ in Thousands	Apr. 30, 2017	Jan. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Cost	$ 3,543	$ 3,543
Accumulated Amortization	(1,937)	(1,849)
Net Book Value	1,606	1,694
Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	3,505	3,505
Accumulated Amortization	(1,899)	(1,811)
Net Book Value	1,606	1,694
Access to Facilities Contract [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	38	38
Accumulated Amortization	$ (38)	$ (38)