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

X

- 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

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X

- 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

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X

- 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

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