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Mergers and Acquisitions - Fair Value of Assets Acquired and Liabilities Assumed (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Feb. 28, 2015 | Aug. 08, 2014 | Mar. 06, 2014
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Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill | $ 104,045 us-gaap_Goodwill | $ 101,059 us-gaap_Goodwill | $ 39,689 us-gaap_Goodwill | $ 13,823 us-gaap_Goodwill |  |  |
ActoGeniX NV | Scenario, Plan |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash |  |  |  |  | 3,180 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = xon_ActoGeniXNVMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember |  |
Other receivables |  |  |  |  | 305 xon_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherReceivables / us-gaap_BusinessAcquisitionAxis = xon_ActoGeniXNVMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember |  |
Prepaid expenses and other |  |  |  |  | 31 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = xon_ActoGeniXNVMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember |  |
Property, plant and equipment |  |  |  |  | 209 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = xon_ActoGeniXNVMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember |  |
Intangible assets |  |  |  |  | 68,100 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = xon_ActoGeniXNVMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember |  |
Other assets |  |  |  |  | 23 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = xon_ActoGeniXNVMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember |  |
Total assets acquired |  |  |  |  | 71,848 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = xon_ActoGeniXNVMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember |  |
Accounts payable |  |  |  |  | 230 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = xon_ActoGeniXNVMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember |  |
Accrued compensation and benefits |  |  |  |  | 624 xon_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedCompensationAndBenefits / us-gaap_BusinessAcquisitionAxis = xon_ActoGeniXNVMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember |  |
Other accrued liabilities |  |  |  |  | 307 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = xon_ActoGeniXNVMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember |  |
Deferred revenue |  |  |  |  | 732 xon_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredRevenue / us-gaap_BusinessAcquisitionAxis = xon_ActoGeniXNVMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember |  |
Deferred tax liability |  |  |  |  | 612 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = xon_ActoGeniXNVMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember |  |
Total liabilities assumed |  |  |  |  | 2,505 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = xon_ActoGeniXNVMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember |  |
Net assets acquired |  |  |  |  | 69,343 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = xon_ActoGeniXNVMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember |  |
Goodwill |  |  |  |  | 3,131 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = xon_ActoGeniXNVMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember |  |
Total consideration and fair value of noncontrolling interest |  |  |  |  | 72,474 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = xon_ActoGeniXNVMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember |  |
Trans Ova Genetics, LC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash |  |  |  |  |  | 960 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = xon_TransOvaGeneticsLcMember |
Trade receivables |  |  |  |  |  | 18,693 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = xon_TransOvaGeneticsLcMember |
Related party receivables |  |  |  |  |  | 1,219 xon_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsRelatedPartyReceivables / us-gaap_BusinessAcquisitionAxis = xon_TransOvaGeneticsLcMember |
Inventory |  |  |  |  |  | 18,476 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = xon_TransOvaGeneticsLcMember |
Prepaid expenses and other |  |  |  |  |  | 590 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = xon_TransOvaGeneticsLcMember |
Property, plant and equipment |  |  |  |  |  | 21,164 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = xon_TransOvaGeneticsLcMember |
Intangible assets |  |  |  |  |  | 23,700 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = xon_TransOvaGeneticsLcMember |
Other assets |  |  |  |  |  | 147 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = xon_TransOvaGeneticsLcMember |
Total assets acquired |  |  |  |  |  | 84,949 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = xon_TransOvaGeneticsLcMember |
Accounts payable |  |  |  |  |  | 3,317 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = xon_TransOvaGeneticsLcMember |
Accrued compensation and benefits |  |  |  |  |  | 913 xon_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedCompensationAndBenefits / us-gaap_BusinessAcquisitionAxis = xon_TransOvaGeneticsLcMember |
Other accrued liabilities |  |  |  |  |  | 271 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = xon_TransOvaGeneticsLcMember |
Deferred revenue |  |  |  |  |  | 4,458 xon_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredRevenue / us-gaap_BusinessAcquisitionAxis = xon_TransOvaGeneticsLcMember |
Lines of credit |  |  |  |  |  | 4,091 xon_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentLiabilitiesLinesofCredit / us-gaap_BusinessAcquisitionAxis = xon_TransOvaGeneticsLcMember |
Related party payables |  |  |  |  |  | 1,246 xon_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentLiabilitiesRelatedPartyPayables / us-gaap_BusinessAcquisitionAxis = xon_TransOvaGeneticsLcMember |
Long term debt |  |  |  |  |  | 9,090 xon_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedLongTermDebt / us-gaap_BusinessAcquisitionAxis = xon_TransOvaGeneticsLcMember |
Total liabilities assumed |  |  |  |  |  | 23,386 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = xon_TransOvaGeneticsLcMember |
Net assets acquired |  |  |  |  |  | 61,563 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = xon_TransOvaGeneticsLcMember |
Goodwill |  |  |  |  |  | 66,312 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = xon_TransOvaGeneticsLcMember |
Total consideration and fair value of noncontrolling interest |  |  |  |  |  | 127,875 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = xon_TransOvaGeneticsLcMember |
Medistem, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash |  |  |  |  |  |  | 8 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = xon_MedistemIncMember
Intangible assets |  |  |  |  |  |  | 4,824 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = xon_MedistemIncMember
Total assets acquired |  |  |  |  |  |  | 4,832 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = xon_MedistemIncMember
Accounts payable |  |  |  |  |  |  | 644 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = xon_MedistemIncMember
Accrued compensation and benefits |  |  |  |  |  |  | 67 xon_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedCompensationAndBenefits / us-gaap_BusinessAcquisitionAxis = xon_MedistemIncMember
Other accrued liabilities |  |  |  |  |  |  | 50 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = xon_MedistemIncMember
Total liabilities assumed |  |  |  |  |  |  | 761 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = xon_MedistemIncMember
Net assets acquired |  |  |  |  |  |  | 4,071 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = xon_MedistemIncMember
Goodwill |  |  |  |  |  |  | 20,924 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = xon_MedistemIncMember
Total consideration and fair value of noncontrolling interest |  |  |  |  |  |  | $ 24,995 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = xon_MedistemIncMember

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