Other Long-Term Liabilities - Schedule of Other Long-Term Liabilities (Detail) - USD ($) $ in Thousands	Apr. 30, 2019	Jan. 31, 2019
Other Liabilities Disclosure [Abstract]
Unrecognized tax benefits, including interest	$ 7,186	$ 6,732
Deferred tax liabilities, non-current	1,293	1,293
Software license liabilities, non-current	479	310
Other long-term liabilities	5	6
Total other long-term liabilities	$ 8,963	$ 8,341