Income Taxes - Company's Deferred Taxes (Detail) - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018
Deferred tax assets:
Net operating losses	$ 16,696	$ 14,292
Tax credit carry forwards	675	693
Stock option book expense	781	1,381
Allowance for doubtful accounts	329	1,521
Allowance for inventory obsolescence	480	430
Accruals not yet deductible for tax purposes	418	611
Fixed assets	1,255	1,325
Other	876	901
Gross deferred tax assets	21,510	21,154
Valuation allowance	(21,407)	(21,154)
Deferred tax assets	103	0
Deferred tax liabilities:
Intangible assets	(35)	0
Other	0	(307)
Deferred tax liabilities	(35)	(307)
Unrecognized tax benefits	0	0
Total deferred tax assets, net	$ 68
Total deferred tax liabilities, net		$ (307)