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Income Taxes (Narrative) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Loss Carryforwards [Line Items]
State income tax net operating loss carryforwards	$ 28,000,000
Unrecognized Tax Benefits - Balance at end of year	1,553,000us-gaap_UnrecognizedTaxBenefits	1,553,000us-gaap_UnrecognizedTaxBenefits	1,539,000us-gaap_UnrecognizedTaxBenefits	1,621,000us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	1,300,000
Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Federal income tax net operating loss carryforwards	93,200,000
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Federal and California research and other credit carryforwards	1,800,000
Federal And California Tax Authority
Operating Loss Carryforwards [Line Items]
Federal and California research and other credit carryforwards	2,100,000
Expiring In Year Two \| State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
State loss carryforward subject to expiration	$ 4,100,000