Other Long-Term Liabilities - Schedule of Other Long-Term Liabilities (Detail) - USD ($) $ in Thousands	Apr. 30, 2017	Jan. 31, 2017
Other Liabilities Disclosure [Abstract]
Unrecognized tax benefits, including interest	$ 1,916	$ 1,905
Deferred tax liabilities, non-current	1,333	1,333
Software license liabilities, non-current	5,751	0
Other long-term liabilities	2	3
Total other long-term liabilities	$ 9,002	$ 3,241