Balance Sheets Details (Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified				9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012		Sep. 30, 2013 Unrealized gains (losses) on available-for-sale securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 139	$ (136)	[1]	$ (136)
Unrealized gains (losses) on available-for-sale securities				447
Tax effects				(172)
Ending balance	$ 139	$ (136)	[1]	$ 139

[1] The Condensed Consolidated Balance Sheet as of December 31, 2012 has been derived from the audited consolidated financial statements as of that date, but does not include all disclosures including notes required by GAAP for complete financial statements.