Property and Equipment - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Property Plant And Equipment [Abstract]
Depreciation and amortization expense excluding software development costs	$ 124,000	$ 112,000	$ 239,000	$ 202,000
Amortization expense related to software development costs	$ 1,000,000	$ 813,000	$ 2,000,000	$ 1,500,000