Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 263,000	$ 211,000	$ 438,000	$ 502,000
Effective tax rate			(1.26%)	(1.67%)
U.S. federal statutory tax rate			34.00%
Income tax examination, description			As a result of net operating loss carryforwards, the Company is subject to audits for tax years 2006 and forward for federal purposes and 2009 and forward for California purposes.