Other Balance Sheet Accounts (Tables)	9 Months Ended
Sep. 30, 2012
Other Balance Sheet Accounts
Schedule of other balance sheet accounts	Table 1

Tabular disclosure of other assets and other liabilities not separately disclosed on the balance sheet.

No definition available.

Name:	us-gaap_ScheduleOfOtherAssetsAndOtherLiabilitiesTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration