Property and Equipment - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Property Plant And Equipment [Abstract]
Depreciation and amortization expense excluding software development costs	$ 140,000	$ 110,000	$ 379,000	$ 312,000
Amortization expense related to software development costs	$ 932,000	$ 1,000,000	$ 3,000,000	$ 2,700,000