Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Oct. 31, 2018	Jan. 31, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepaid expenses	$ 11,652	$ 8,494
Other current assets	3,385	2,897
Total prepaid expenses and other current assets	$ 15,037	$ 11,391