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Income Taxes - Additional Information (Details) (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Income Tax Disclosure [Abstract] |  |
Taxable income (loss) | $ (26,600,000)xon_TaxableIncomeLoss | $ 15,300,000 xon_TaxableIncomeLoss
Current income tax expense (benefit) | 0 us-gaap_CurrentIncomeTaxExpenseBenefit | 306,000 us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax expense (benefit) | 795,000 us-gaap_DeferredIncomeTaxExpenseBenefit | 0 us-gaap_DeferredIncomeTaxExpenseBenefit
Deferred tax liabilities | 1,379,000 us-gaap_DeferredTaxLiabilities |
Domestic Tax Authority |  |
Income Tax Disclosure [Abstract] |  |
Operating loss carryforwards | 281,100,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |
Federal and state research and development tax credits | 6,800,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |
Expiration date of Federal income tax loss carryforwards | 2022 |
Domestic Tax Authority | Stock Compensation Deductions |  |
Income Tax Disclosure [Abstract] |  |
Operating loss carryforwards | 15,800,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember / xon_OperatingLossCarryforwardsAxis = xon_ShareBasedCompensationMember |
Foreign Tax Authority |  |
Income Tax Disclosure [Abstract] |  |
Operating loss carryforwards | $ 75,500,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |

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