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Income Taxes Reconciliation of Amount of Tax at Statutory Rate to Effective Rate (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]    
Tax (provision) at Federal statutory rate $ (2,798) $ (2,642)
State income tax (provision), net of federal benefit (257) (293)
Research and development tax credits 549 616
Foreign earnings or losses taxed at different rates (102) (170)
Other 383 8
Change in valuation allowance (408) (109)
(Provision) for income taxes $ (2,633) $ (2,590)