Income Taxes - Company's Deferred Taxes (Detail) - USD ($) $ in Thousands	Jan. 31, 2018	Jan. 31, 2017
Deferred tax assets:
Net operating losses	$ 14,292	$ 17,666
Tax credit carry forwards	693	894
Stock option book expense	1,381	2,259
Allowance for doubtful accounts	1,521	2,098
Allowance for inventory obsolescence	430	437
Accruals not yet deductible for tax purposes	611	691
Fixed assets	1,325	1,266
Other	901	1,046
Gross deferred tax assets	21,154	26,357
Valuation allowance	(21,154)	(26,357)
Deferred tax assets	0	0
Deferred tax liabilities:
Intangible assets	0	(150)
Other	(307)	(167)
Deferred tax liabilities	(307)	(317)
Unrecognized tax benefits	0	0
Total deferred tax liabilities, net	$ (307)	$ (317)