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Collaboration Revenue - Summary of Deferred Revenue (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Deferred Revenue Arrangement [Line Items] |  |
Current portion of deferred revenue | $ 17,289 us-gaap_DeferredRevenueCurrent | $ 16,522 us-gaap_DeferredRevenueCurrent
Long-term portion of deferred revenue | 93,998 us-gaap_DeferredRevenueNoncurrent | 96,687 us-gaap_DeferredRevenueNoncurrent
Deferred revenue | 111,287 us-gaap_DeferredRevenue | 113,209 us-gaap_DeferredRevenue
Upfront and Milestone Payments |  |
Deferred Revenue Arrangement [Line Items] |  |
Deferred revenue | 104,297 us-gaap_DeferredRevenue / us-gaap_ProductOrServiceAxis = xon_UpfrontAndMilestonePaymentsMember | 107,228 us-gaap_DeferredRevenue / us-gaap_ProductOrServiceAxis = xon_UpfrontAndMilestonePaymentsMember
Prepaid Research and Development Services |  |
Deferred Revenue Arrangement [Line Items] |  |
Deferred revenue | 1,038 us-gaap_DeferredRevenue / us-gaap_ProductOrServiceAxis = xon_PrepaidResearchAndDevelopmentServicesMember | 1,045 us-gaap_DeferredRevenue / us-gaap_ProductOrServiceAxis = xon_PrepaidResearchAndDevelopmentServicesMember
Prepaid Product and Service Revenues |  |
Deferred Revenue Arrangement [Line Items] |  |
Deferred revenue | 4,740 us-gaap_DeferredRevenue / us-gaap_ProductOrServiceAxis = xon_PrepaidProductAndServiceRevenuesMember | 4,365 us-gaap_DeferredRevenue / us-gaap_ProductOrServiceAxis = xon_PrepaidProductAndServiceRevenuesMember
Other |  |
Deferred Revenue Arrangement [Line Items] |  |
Deferred revenue | $ 1,212 us-gaap_DeferredRevenue / us-gaap_ProductOrServiceAxis = xon_DeferredRevenueOtherMember | $ 571 us-gaap_DeferredRevenue / us-gaap_ProductOrServiceAxis = xon_DeferredRevenueOtherMember

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- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 + Details
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- Definition The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A + Details
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- Definition The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A + Details
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