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Income Taxes - Deferred Income Tax Assests (Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Accruals and reserves	$ 2,271	$ 3,288
Net operating loss carryforwards	14,816	21,125
Research and development credit carryforward	858	556
Gross deferred tax asset	17,945	24,969
Valuation allowance	17,945	24,969
Net deferred tax asset	$ 0	$ 0

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from reserves and accruals.

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.