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Income Taxes - Schedule of Deferred Tax Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Net operating losses $ 82,054us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 80,388us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Capitalized research and development 7,176zgnx_DeferredTaxAssetsCapitalizedResearchAndDevelopment 8,172zgnx_DeferredTaxAssetsCapitalizedResearchAndDevelopment
Accrued expenses 2,030us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 3,263us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Research and development credits 3,395us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 2,010us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Accrued product returns 1,772us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 2,029us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Inventory reserve and UNICAP 2,956us-gaap_DeferredTaxAssetsInventory 660us-gaap_DeferredTaxAssetsInventory
Depreciation and amortization 2,556us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 2,861us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Deferred revenue 4,446us-gaap_DeferredTaxAssetsDeferredIncome 0us-gaap_DeferredTaxAssetsDeferredIncome
Other, net 5,128us-gaap_DeferredTaxAssetsOther 4,736us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 111,513us-gaap_DeferredTaxAssetsGross 104,119us-gaap_DeferredTaxAssetsGross
Less valuation allowance (110,338)us-gaap_DeferredTaxAssetsValuationAllowance (102,949)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets 1,175us-gaap_DeferredTaxAssetsNet 1,170us-gaap_DeferredTaxAssetsNet
Depreciation (1,175)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (1,170)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
IPR&D (20,500)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedResearchAndDevelopmentCosts 0us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedResearchAndDevelopmentCosts
Total deferred tax liabilities (21,675)us-gaap_DeferredTaxLiabilities (1,170)us-gaap_DeferredTaxLiabilities
Net deferred tax liability $ (20,500)us-gaap_DeferredTaxAssetsLiabilitiesNet $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet