Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Apr. 30, 2017	Jan. 31, 2017
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepaid expenses	$ 11,029	$ 9,256
Other current assets	3,807	1,570
Total prepaid expenses and other current assets	$ 14,836	$ 10,826