Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Income Tax Disclosure [Abstract]
Recognized deferred tax liability related to undistributed earnings	$ 0
Deferred tax assets	2,259,000	$ 2,716,000
Valuation allowance, deferred tax assets	26,357,000	16,647,000
Deferred tax asset		416,000
Tax credit carry forwards	$ 894,000
Tax credit carry forwards expiration year	2021
Unrecognized Tax Benefit	$ 0	0	$ 237,000
Accrued interest and penalties			145,000
Potential penalties and interest		$ 145,000	$ 10,000