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Income Taxes - Company's Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets:      
Depreciation and amortization $ 780cytk_DeferredTaxAssetsDepreciationAndAmortization $ 918cytk_DeferredTaxAssetsDepreciationAndAmortization $ 1,024cytk_DeferredTaxAssetsDepreciationAndAmortization
Capitalized R&D 15,176cytk_DeferredTaxAssetsCapitalizedResearchAndDevelopment 20,702cytk_DeferredTaxAssetsCapitalizedResearchAndDevelopment 4,932cytk_DeferredTaxAssetsCapitalizedResearchAndDevelopment
Reserves and accruals 6,217us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 4,946us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 5,101us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Net operating losses 148,184us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 144,254us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 153,193us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Tax credits 34,543us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 33,043us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 25,943us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Total deferred tax assets 204,900us-gaap_DeferredTaxAssetsGross 203,863us-gaap_DeferredTaxAssetsGross 190,193us-gaap_DeferredTaxAssetsGross
Less: Valuation allowance (204,900)us-gaap_DeferredTaxAssetsValuationAllowance (203,863)us-gaap_DeferredTaxAssetsValuationAllowance (190,193)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets $ 0us-gaap_DeferredTaxAssetsNet $ 0us-gaap_DeferredTaxAssetsNet $ 0us-gaap_DeferredTaxAssetsNet