Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Income Tax Disclosure [Abstract]
Income tax benefit	$ 530	$ 46	$ 188	$ 44
Pre-tax net loss	$ 2,426	$ 1,540	$ 8,511	$ 3,734