Balance Sheet Components - Schedule of Prepaid Expenses, Restricted Cash and Other Current Assets (Details) - USD ($) $ in Thousands	Oct. 31, 2015	Jan. 31, 2015
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Tenant incentives receivable under our new headquarters lease in Redwood City (see Note 8)	$ 9,815	$ 0
Restricted cash and other	11,841	12,132
Total prepaid expenses, restricted cash and other current assets	$ 21,656	$ 12,132

This item represents the current receivable for an incentive or inducement contractually stipulated between parties to a lease whereby the lessor has committed to provide the entity (lessee) with a cash payment as inducement to enter the lease. The receivable is due within one year. For classified balance sheets, this element represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_LeaseIncentiveReceivableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant