Accrued Expenses - Summary of Accrued Expenses (Detail) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Payables and Accruals [Abstract]
Professional Fees	$ 584	$ 328
Warranty	515	400	$ 375	$ 355
Product Replacement Cost Reserve	174	278
Dealer Commissions	180	221
Other	718	982
Total	$ 2,171	$ 2,209