Other Long-Term Liabilities - Schedule of Other Long-Term Liabilities (Detail) - USD ($) $ in Thousands	Jul. 31, 2018	Jan. 31, 2018
Other Liabilities Disclosure [Abstract]
Unrecognized tax benefits, including interest	$ 6,058	$ 5,352
Deferred tax liabilities, non-current	1,293	1,293
Software license liabilities, non-current	2,856	4,484
Other long-term liabilities	45	97
Total other long-term liabilities	$ 10,252	$ 11,226