Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Jan. 31, 2018
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 437,000	$ 229,000
Pre-tax net loss	$ 5,468,000	$ 2,436,000
Effective tax rate	(8.00%)	(9.40%)
Non-current prepaid income taxes	$ 1,603,000		$ 1,609,000
Unrecognized tax expense or benefit	$ 0	$ 0