Income Taxes - Net Deferred Tax Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 33,732us-gaap_OperatingLossCarryforwards	$ 34,727us-gaap_OperatingLossCarryforwards
Research and development and other credits	1,950	1,928
Reserves	1,417	1,273
Intangibles	2,097	2,425
Other, net	1,079us-gaap_DeferredTaxAssetsOther	830us-gaap_DeferredTaxAssetsOther
Total deferred tax assets	40,275us-gaap_DeferredTaxAssetsGross	41,183us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities—depreciation	(237)	(300)
Valuation allowance for deferred tax assets	(40,059)	(40,883)
Net deferred tax assets (liabilities)	$ (21)us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 0us-gaap_DeferredTaxAssetsLiabilitiesNet

Deferred Tax Liabilites, Depreciation

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from intangible assets including goodwill.

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

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from in-process research and development costs expensed in connection with a business combination.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

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

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

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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