Goodwill and Intangible Assets, net - Narrative (Details) - USD ($)	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Jan. 31, 2018	[1]
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 6,282,000		$ 6,282,000
Goodwill impairments	0	$ 0
Capitalized internal-use software	1,300,000	1,400,000
Stock-based compensation included in capitalized software costs	200,000	200,000
Amortization expense	$ 1,200,000	$ 700,000

[1] See Note 2 for a summary of adjustments.