Other Long-Term Liabilities - Schedule of Other Long-Term Liabilities (Detail) - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Other Liabilities Disclosure [Abstract]
Unrecognized tax benefits, including interest	$ 1,942	$ 1,905
Deferred tax liabilities, non-current	1,333	1,333
Software license liabilities, non-current	5,851	0
Other long-term liabilities	5	3
Total other long-term liabilities	$ 9,131	$ 3,241