Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Jan. 31, 2017
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 586,000	$ (228,000)	$ 1,172,000	$ 506,000
Pre-tax net loss	(4,695,000)	(7,558,000)	$ (12,138,000)	$ (22,793,000)
Effective tax rate			(9.70%)	(2.20%)
Non-current prepaid income taxes	1,167,000		$ 1,167,000		$ 0
Prepaid income taxes	0		0		$ 1,565,000
Unrecognized Tax Benefit	$ 0	$ 0	$ 0	$ 0