Other Long-Term Liabilities - Schedule of Other Long-Term Liabilities (Detail) - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018
Other Liabilities Disclosure [Abstract]
Unrecognized tax benefits, including interest	$ 6,732	$ 5,352
Deferred tax liabilities, non-current	1,293	1,293
Software license liabilities, non-current	310	4,484
Other long-term liabilities	6	97
Total other long-term liabilities	$ 8,341	$ 11,226