Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepaid expenses	$ 11,032	$ 8,410
Tenant incentives receivable under our headquarters lease in Redwood City		3,024
Other current assets	2,738	3,295
Total prepaid expenses and other current assets	$ 13,770	$ 14,729