Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017	Jan. 31, 2018
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 85,000	$ 357,000	$ 522,000	$ 586,000
Pre-tax net loss	4,504,000	5,007,000	$ 9,972,000	$ 7,443,000
Effective tax rate			(5.20%)	(7.90%)
Non-current prepaid income taxes	1,570,000		$ 1,570,000		$ 1,609,000
Unrecognized tax benefit	$ 0	$ 0	$ 0	$ 0