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Income Taxes - Net deferred tax assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current deferred tax assets:    
Vacation accrual $ 25us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences $ 27us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences
Total current deferred tax assets 25us-gaap_DeferredTaxAssetsGrossCurrent 27us-gaap_DeferredTaxAssetsGrossCurrent
Valuation allowance (25)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent (27)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent
Net current deferred tax assets 0us-gaap_DeferredTaxAssetsNetCurrent 0us-gaap_DeferredTaxAssetsNetCurrent
Noncurrent deferred tax assets:    
Net operating loss carryforwards 42,135us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration 39,799us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration
Charitable contribution carryforwards 410us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards 371us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards
Research and experimentation credits 991us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 820us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Capitalized intangibles 741us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 3,351us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Stock based compensation 158us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 454us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Depreciation and amortization 2us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 5us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Total noncurrent deferred tax assets 44,437us-gaap_DeferredTaxAssetsGrossNoncurrent 44,800us-gaap_DeferredTaxAssetsGrossNoncurrent
Valuation allowance (44,437)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent (44,800)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent
Net noncurrent deferred tax assets 0us-gaap_DeferredTaxAssetsNetNoncurrent 0us-gaap_DeferredTaxAssetsNetNoncurrent
Net noncurrent deferred tax assets $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet