Contingencies Patent infringement (Details)	Dec. 23, 2015
Patent Infringement
Loss Contingencies [Line Items]
Number of patents allegedly infringed	4

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration