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Subsequent Events - Additional Information (Details) (USD $) | 1 Months Ended |
--- | --- | ---
May 31, 2015 | Apr. 30, 2015 | Mar. 31, 2015
ZIOPHARM Oncology, Inc. |  |  |
Subsequent Event [Line Items] |  |  |
Common stock purchase commitment |  |  | $ 50,000,000 xon_AdditionalSharesValueAgreedToPurchase / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = xon_ZiopharmMember
ZIOPHARM Oncology, Inc. | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Shares of common stock | 17,830,305 xon_SharesOfCommonStockToBeDistributedAsADividend / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = xon_ZiopharmMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Common stock purchase commitment | 43,500,000 xon_AdditionalSharesValueAgreedToPurchase / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = xon_ZiopharmMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Ares Trading S.A., a subsidiary of Merck Serono S.A. | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Consideration to be received upon achievement of future milestones | 826,000,000 xon_MaximumMilestonePaymentsRequiredUponSuccessfulAchievement / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_TypeOfArrangementAxis = xon_AresTradingS.A.Member |  |
Ares Trading S.A., a subsidiary of Merck Serono S.A. | ZIOPHARM Oncology, Inc. | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Percent of certain collaboration payments | 50.00%xon_PercentOfCollaborationPayments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = xon_ZiopharmMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_TypeOfArrangementAxis = xon_AresTradingS.A.Member |  |
Upfront | Ares Trading S.A., a subsidiary of Merck Serono S.A. | Upfront and Milestone Payments | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Collaborative arrangement consideration received, value | 115,000,000 xon_CollaborativeArrangementConsiderationReceivedValue / us-gaap_ContingentConsiderationByTypeAxis = xon_UpfrontMember / us-gaap_ProductOrServiceAxis = xon_UpfrontAndMilestonePaymentsMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_TypeOfArrangementAxis = xon_AresTradingS.A.Member |  |
Okanagan Specialty Fruits Inc. | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Percentage of outstanding common stock acquired |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = xon_OkanaganSpecialtyFruitsIncMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Cash paid for acquisition |  | $ 10,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = xon_OkanaganSpecialtyFruitsIncMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Business acquisition, consideration paid, shares issued |  | 707,853 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = xon_OkanaganSpecialtyFruitsIncMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |

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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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