Income Taxes - Company's Deferred Taxes (Detail) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Deferred tax assets:
Net operating losses	$ 17,666	$ 10,127
Tax credit carry forwards	894	823
Stock option book expense	2,259	2,716
Allowance for doubtful accounts	2,098	2,121
Allowance for inventory obsolescence	437	116
Accruals not yet deductible for tax purposes	691	636
Fixed assets	1,266	299
Other	1,046	627
Gross deferred tax assets	26,357	17,465
Valuation allowance	(26,357)	(16,647)
Deferred tax assets		818
Deferred tax liabilities:
Intangible assets	(150)	(215)
Other	(167)	(17)
Deferred tax liabilities	(317)	(232)
Unrecognized tax benefits	0	0
Total deferred tax assets, net		$ 586
Total deferred tax liabilities, net	$ (317)