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Income Taxes - Summary of Significant Components of Deferred Tax Assets (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Acquired technology $ 317,000us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets $ 147,000us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Stock compensation expense 223,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 67,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Accruals and other 105,000evok_DeferredTaxAssetsTaxAccrualsAndOther 223,000evok_DeferredTaxAssetsTaxAccrualsAndOther
Total deferred tax assets 645,000us-gaap_DeferredTaxAssetsGross 437,000us-gaap_DeferredTaxAssetsGross
Less valuation allowance $ (645,000)us-gaap_DeferredTaxAssetsValuationAllowance $ (437,000)us-gaap_DeferredTaxAssetsValuationAllowance