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Income Taxes - Tax Effects of Temporary Differences That Comprise Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Deferred tax assets        
Allowance for doubtful accounts $ 783us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts $ 0us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts    
Equity securities 4,694xon_DeferredTaxAssetInvestmentsFairValueOption 415xon_DeferredTaxAssetInvestmentsFairValueOption    
Property, plant and equipment 79us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 0us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment    
Accrued liabilities and long-term debt 2,703xon_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilitiesAndLongTermDebt 1,445xon_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilitiesAndLongTermDebt    
Stock-based compensation 8,283us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 1,677us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost    
Deferred revenue 43,774us-gaap_DeferredTaxAssetsDeferredIncome 28,456us-gaap_DeferredTaxAssetsDeferredIncome    
Research and development tax credits 9,661us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 10,062us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch    
Net operating loss carryforwards 103,114us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 97,395us-gaap_DeferredTaxAssetsOperatingLossCarryforwards    
Total deferred tax assets 173,091us-gaap_DeferredTaxAssetsGross 139,450us-gaap_DeferredTaxAssetsGross    
Less: Valuation allowance 161,660us-gaap_DeferredTaxAssetsValuationAllowance 131,985us-gaap_DeferredTaxAssetsValuationAllowance 113,051us-gaap_DeferredTaxAssetsValuationAllowance 82,125us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets 11,431us-gaap_DeferredTaxAssetsNet 7,465us-gaap_DeferredTaxAssetsNet    
Deferred tax liabilities        
Property, plant and equipment 0us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 140us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment    
Intangible assets 11,431us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 7,325us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets    
Total deferred tax liabilities 11,431us-gaap_DeferredIncomeTaxLiabilities 7,465us-gaap_DeferredIncomeTaxLiabilities    
Net deferred tax assets (liabilities) $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet