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Income Taxes (Tables) - Reconciliation of Amount of Tax at Statutory Rate to Effective Rate (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Tax (provision) at Federal statutory rate	$ (2,642)	$ (14,894)
State income tax (provision), net of federal benefit	(293)	(1,476)
Research and development tax credits	616	357
Foreign earnings or losses taxed at different rates	(170)	(136)
Other	8	(555)
Change in valuation allowance	(109)	796
(Provision) for income taxes	$ (2,590)	$ (15,908)

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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