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INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
INCOME TAXES [Abstract]    
Operating loss carryforward $ 49,238us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 52,092us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Research and development credit 4,018us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 3,265us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Accrued social benefits 1,183us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 182us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Property and equipment (365)us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment   
Net deferred tax asset before valuation allowance 54,074us-gaap_DeferredTaxAssetsGross 55,539us-gaap_DeferredTaxAssetsGross
Valuation allowance (54,074)us-gaap_DeferredTaxAssetsValuationAllowance (55,539)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax asset