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Income Taxes - Additional Information (Details) (USD $)
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3 Months Ended | |
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Mar. 31, 2015
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Mar. 31, 2014
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| Income Tax Disclosure [Abstract] | ||
| Taxable income (loss) | $ (26,600,000)xon_TaxableIncomeLoss | $ 15,300,000xon_TaxableIncomeLoss |
| Current income tax expense (benefit) | 0us-gaap_CurrentIncomeTaxExpenseBenefit | 306,000us-gaap_CurrentIncomeTaxExpenseBenefit |
| Deferred income tax expense (benefit) | 795,000us-gaap_DeferredIncomeTaxExpenseBenefit | 0us-gaap_DeferredIncomeTaxExpenseBenefit |
| Deferred tax liabilities | 1,379,000us-gaap_DeferredTaxLiabilities | |
| Domestic Tax Authority | ||
| Income Tax Disclosure [Abstract] | ||
| Operating loss carryforwards | 281,100,000us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |
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| Federal and state research and development tax credits | 6,800,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |
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| Expiration date of Federal income tax loss carryforwards | 2022 | |
| Domestic Tax Authority | Stock Compensation Deductions | ||
| Income Tax Disclosure [Abstract] | ||
| Operating loss carryforwards | 15,800,000us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember / xon_OperatingLossCarryforwardsAxis = xon_ShareBasedCompensationMember |
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| Foreign Tax Authority | ||
| Income Tax Disclosure [Abstract] | ||
| Operating loss carryforwards | $ 75,500,000us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |
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- Definition
Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Expiration date range for Federal income tax loss carryforwards, start No definition available.
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- Definition
Taxable income (loss) No definition available.
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- Details
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- Details
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