Income Taxes - Company's Deferred Taxes (Detail) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Deferred tax assets:
Net operating losses	$ 17,978	$ 16,696
Tax credit carry forwards	724	675
Stock option book expense	650	781
Allowance for doubtful accounts	776	329
Allowance for inventory obsolescence	570	480
Accruals not yet deductible for tax purposes	357	418
Fixed assets	851	1,255
Intangible assets	337	0
Other	954	876
Gross deferred tax assets	23,197	21,510
Valuation allowance	(23,197)	(21,407)
Deferred tax assets	0	103
Deferred tax liabilities:
Intangible assets	0	(35)
Other	(200)	0
Deferred tax liabilities	(200)	(35)
Unrecognized tax benefits	0	0
Total deferred tax liabilities, net	$ (200)
Total deferred tax assets, net		$ 68