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Collaboration Revenue - Additional Information (Details) (USD $)
3 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Jun. 05, 2012
Sep. 30, 2013
Apr. 30, 2013
Oct. 05, 2012
Mar. 29, 2013
Feb. 14, 2013
Mar. 26, 2014
Jan. 06, 2011
Dec. 18, 2013
Dec. 31, 2014
Mar. 31, 2014
Jan. 10, 2014
Jun. 28, 2013
Oct. 24, 2012
Collaboration Agreements [Line Items]                                
Collaboration revenue $ 14,735,000xon_CollaborationRevenues $ 7,837,000xon_CollaborationRevenues                            
Deferred revenue 111,287,000us-gaap_DeferredRevenue                     113,209,000us-gaap_DeferredRevenue        
Upfront and Milestone Payments                                
Collaboration Agreements [Line Items]                                
Collaboration revenue 3,031,000xon_CollaborationRevenues
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
1,882,000xon_CollaborationRevenues
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
                           
Deferred revenue 104,297,000us-gaap_DeferredRevenue
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
                    107,228,000us-gaap_DeferredRevenue
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
       
Oragenics ECC 1                                
Collaboration Agreements [Line Items]                                
Percent of shares outstanding at the date of achievement of future milestone     1.00%xon_CollaborativeArrangementAdditionalConsiderationReceivableAsPercentageOfOutstandingShares
/ us-gaap_TypeOfArrangementAxis
= xon_OragenicsEccMember
                         
Royalty rate as a percentage of net profit     25.00%xon_CollaborativeArrangementRoyaltyRateAsPercentageOfNetProfit
/ us-gaap_TypeOfArrangementAxis
= xon_OragenicsEccMember
                         
Required notice period for voluntary termination of collaborative agreement     90 days                          
Percentage of shares outstanding at the date of achievement of future milestone 2     1.50%xon_CollaborativeArrangementAdditionalConsiderationReceivableAsPercentageOfOutstandingSharesTwo
/ us-gaap_TypeOfArrangementAxis
= xon_OragenicsEccMember
                         
Percentage of shares outstanding at the date of achievement of future milestone 3     2.00%xon_CollaborativeArrangementAdditionalConsiderationReceivableAsPercentageOfOutstandingSharesThree
/ us-gaap_TypeOfArrangementAxis
= xon_OragenicsEccMember
                         
Percentage of shares outstanding at the date of achievement of future milestone 4     2.50%xon_CollaborativeArrangementAdditionalConsiderationReceivableAsPercentageOfOutstandingSharesFour
/ us-gaap_TypeOfArrangementAxis
= xon_OragenicsEccMember
                         
Percentage of shares outstanding at the date of achievement of future milestone 5     3.00%xon_CollaborativeArrangementAdditionalConsiderationReceivableAsPercentageOfOutstandingSharesFive
/ us-gaap_TypeOfArrangementAxis
= xon_OragenicsEccMember
                         
Oragenics ECC 1 | Upfront and Milestone Payments                                
Collaboration Agreements [Line Items]                                
Deferred revenue 5,033,000us-gaap_DeferredRevenue
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_OragenicsEccMember
                    5,171,000us-gaap_DeferredRevenue
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_OragenicsEccMember
       
Oragenics ECC 2                                
Collaboration Agreements [Line Items]                                
Required notice period for voluntary termination of collaborative agreement       90 days                        
Consideration to be received upon achievement of future milestone 1   2,000,000xon_FutureMilestonePaymentOne
/ us-gaap_TypeOfArrangementAxis
= xon_OragenicsSecondEccMember
                    2,000,000xon_FutureMilestonePaymentOne
/ us-gaap_TypeOfArrangementAxis
= xon_OragenicsSecondEccMember
     
Consideration to be received upon achievement of future milestone 2   5,000,000xon_FutureMilestonePaymentTwo
/ us-gaap_TypeOfArrangementAxis
= xon_OragenicsSecondEccMember
                    5,000,000xon_FutureMilestonePaymentTwo
/ us-gaap_TypeOfArrangementAxis
= xon_OragenicsSecondEccMember
     
Consideration to be received upon achievement of future milestone 3   10,000,000xon_FutureMilestonePaymentThree
/ us-gaap_TypeOfArrangementAxis
= xon_OragenicsSecondEccMember
                    10,000,000xon_FutureMilestonePaymentThree
/ us-gaap_TypeOfArrangementAxis
= xon_OragenicsSecondEccMember
     
Royalty rate as a percentage of net sales, tier 1       10.00%xon_CollaborativeArrangementRoyaltiesAsPercentageOfNetSalesTierOne
/ us-gaap_TypeOfArrangementAxis
= xon_OragenicsSecondEccMember
                       
Oragenics ECC 2 | Upfront and Milestone Payments                                
Collaboration Agreements [Line Items]                                
Deferred revenue 4,715,000us-gaap_DeferredRevenue
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_OragenicsSecondEccMember
                    4,839,000us-gaap_DeferredRevenue
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_OragenicsSecondEccMember
       
Fibrocell Science, Inc.                                
Collaboration Agreements [Line Items]                                
Collaboration revenue 2,161,000xon_CollaborationRevenues
/ us-gaap_TypeOfArrangementAxis
= xon_FibrocellMember
1,310,000xon_CollaborationRevenues
/ us-gaap_TypeOfArrangementAxis
= xon_FibrocellMember
                           
Required notice period for voluntary termination of collaborative agreement           90 days                    
Royalty rate as a percentage of net sales, tier 1           7.00%xon_CollaborativeArrangementRoyaltiesAsPercentageOfNetSalesTierOne
/ us-gaap_TypeOfArrangementAxis
= xon_FibrocellMember
                   
Reverse stock split ratio         1-for-25                      
Level of net sales at which royalty rate changes to tier 2           25,000,000xon_CollaborativeArrangementNetSalesAtWhichRoyaltyRateChangesToTierTwo
/ us-gaap_TypeOfArrangementAxis
= xon_FibrocellMember
                   
Royalty rate as a percentage of net sales, tier 2           14.00%xon_CollaborativeArrangementRoyaltiesAsPercentageOfNetSalesTierTwo
/ us-gaap_TypeOfArrangementAxis
= xon_FibrocellMember
                   
Royalty rate of savings from improvement           33.00%xon_CollaborativeArrangementRoyaltyRateAsPercentageOfSavingsFromImprovement
/ us-gaap_TypeOfArrangementAxis
= xon_FibrocellMember
                   
Fibrocell Science, Inc. | Upfront and Milestone Payments                                
Collaboration Agreements [Line Items]                                
Collaboration revenue 448,000xon_CollaborationRevenues
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_FibrocellMember
448,000xon_CollaborationRevenues
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_FibrocellMember
                           
Deferred revenue 17,043,000us-gaap_DeferredRevenue
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_FibrocellMember
                    17,491,000us-gaap_DeferredRevenue
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_FibrocellMember
       
Genopaver, LLC                                
Collaboration Agreements [Line Items]                                
Collaboration revenue 669,000xon_CollaborationRevenues
/ us-gaap_TypeOfArrangementAxis
= xon_GenopaverEccMember
490,000xon_CollaborationRevenues
/ us-gaap_TypeOfArrangementAxis
= xon_GenopaverEccMember
                           
Required notice period for voluntary termination of collaborative agreement             90 days                  
Genopaver, LLC | Upfront and Milestone Payments                                
Collaboration Agreements [Line Items]                                
Collaboration revenue 69,000xon_CollaborationRevenues
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_GenopaverEccMember
69,000xon_CollaborationRevenues
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_GenopaverEccMember
                           
Deferred revenue 2,454,000us-gaap_DeferredRevenue
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_GenopaverEccMember
                    2,523,000us-gaap_DeferredRevenue
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_GenopaverEccMember
       
AquaBounty Technologies, Inc.                                
Collaboration Agreements [Line Items]                                
Royalty rate as a percentage of gross profit               16.66%xon_CollaborativeArrangementRoyaltyRateAsPercentageOfGrossProfit
/ us-gaap_TypeOfArrangementAxis
= xon_AquaBountyMember
               
Intrexon Energy Partners, LLC                                
Collaboration Agreements [Line Items]                                
Collaboration revenue 2,810,000xon_CollaborationRevenues
/ us-gaap_TypeOfArrangementAxis
= xon_IntrexonEnergyPartnersMember
                             
Required notice period for voluntary termination of collaborative agreement                 90 days              
Intrexon Energy Partners, LLC | Upfront and Milestone Payments                                
Collaboration Agreements [Line Items]                                
Collaboration revenue 625,000xon_CollaborationRevenues
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_IntrexonEnergyPartnersMember
                             
Deferred revenue 22,500,000us-gaap_DeferredRevenue
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_IntrexonEnergyPartnersMember
                    23,125,000us-gaap_DeferredRevenue
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_IntrexonEnergyPartnersMember
       
ZIOPHARM Oncology, Inc.                                
Collaboration Agreements [Line Items]                                
Collaboration revenue 3,801,000xon_CollaborationRevenues
/ us-gaap_TypeOfArrangementAxis
= xon_ZiopharmMember
2,680,000xon_CollaborationRevenues
/ us-gaap_TypeOfArrangementAxis
= xon_ZiopharmMember
                           
Percent of shares outstanding at the date of achievement of future milestone                   7.495%xon_CollaborativeArrangementAdditionalConsiderationReceivableAsPercentageOfOutstandingShares
/ us-gaap_TypeOfArrangementAxis
= xon_ZiopharmMember
           
Royalty rate as a percentage of net profit                   50.00%xon_CollaborativeArrangementRoyaltyRateAsPercentageOfNetProfit
/ us-gaap_TypeOfArrangementAxis
= xon_ZiopharmMember
           
Required notice period for voluntary termination of collaborative agreement                   90 days            
ZIOPHARM Oncology, Inc. | Upfront and Milestone Payments                                
Collaboration Agreements [Line Items]                                
Collaboration revenue 644,000xon_CollaborationRevenues
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_ZiopharmMember
644,000xon_CollaborationRevenues
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_ZiopharmMember
                           
Deferred revenue 22,549,000us-gaap_DeferredRevenue
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_ZiopharmMember
                    23,193,000us-gaap_DeferredRevenue
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_ZiopharmMember
       
S & I Ophthalmic, LLC                                
Collaboration Agreements [Line Items]                                
Collaboration revenue 755,000xon_CollaborationRevenues
/ us-gaap_TypeOfArrangementAxis
= xon_SIOphthalmicMember
879,000xon_CollaborationRevenues
/ us-gaap_TypeOfArrangementAxis
= xon_SIOphthalmicMember
                           
Required notice period for voluntary termination of collaborative agreement       90 days                        
S & I Ophthalmic, LLC | Upfront and Milestone Payments                                
Collaboration Agreements [Line Items]                                
Collaboration revenue 0xon_CollaborationRevenues
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_SIOphthalmicMember
0xon_CollaborationRevenues
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_SIOphthalmicMember
                           
OvaXon, LLC                                
Collaboration Agreements [Line Items]                                
Collaboration revenue 644,000xon_CollaborationRevenues
/ us-gaap_TypeOfArrangementAxis
= xon_OvaXonMember
169,000xon_CollaborationRevenues
/ us-gaap_TypeOfArrangementAxis
= xon_OvaXonMember
                           
Required notice period for voluntary termination of collaborative agreement                     90 days          
OvaXon, LLC | Upfront and Milestone Payments                                
Collaboration Agreements [Line Items]                                
Collaboration revenue 0xon_CollaborationRevenues
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_OvaXonMember
0xon_CollaborationRevenues
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_OvaXonMember
                           
Persea Bio, LLC                                
Collaboration Agreements [Line Items]                                
Collaboration revenue 240,000xon_CollaborationRevenues
/ us-gaap_TypeOfArrangementAxis
= xon_PerseaBioLLCMember
                             
Required notice period for voluntary termination of collaborative agreement                       90 days        
Persea Bio, LLC | Upfront and Milestone Payments                                
Collaboration Agreements [Line Items]                                
Collaboration revenue 125,000xon_CollaborationRevenues
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_PerseaBioLLCMember
                             
Deferred revenue 4,875,000us-gaap_DeferredRevenue
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_PerseaBioLLCMember
                    5,000,000us-gaap_DeferredRevenue
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_PerseaBioLLCMember
       
Upfront | Oragenics ECC 1 | Upfront and Milestone Payments                                
Collaboration Agreements [Line Items]                                
Collaborative arrangement consideration received, shares     4,392,425xon_CollaborativeArrangementConsiderationReceivedShares
/ us-gaap_ContingentConsiderationByTypeAxis
= xon_UpfrontMember
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_OragenicsEccMember
                         
Collaborative arrangement consideration received, value     6,588,000xon_CollaborativeArrangementConsiderationReceivedValue
/ us-gaap_ContingentConsiderationByTypeAxis
= xon_UpfrontMember
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_OragenicsEccMember
                         
Upfront | Oragenics ECC 2 | Upfront and Milestone Payments                                
Collaboration Agreements [Line Items]                                
Collaborative arrangement consideration received, shares       1,348,000xon_CollaborativeArrangementConsiderationReceivedShares
/ us-gaap_ContingentConsiderationByTypeAxis
= xon_UpfrontMember
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_OragenicsSecondEccMember
                       
Collaborative arrangement consideration received, value       3,503,000xon_CollaborativeArrangementConsiderationReceivedValue
/ us-gaap_ContingentConsiderationByTypeAxis
= xon_UpfrontMember
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_OragenicsSecondEccMember
                       
Collaborative arrangement consideration received, value of convertible promissory note       1,956,000xon_CollaborativeArrangementConsiderationReceivedValueOfConvertiblePromissoryNote
/ us-gaap_ContingentConsiderationByTypeAxis
= xon_UpfrontMember
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_OragenicsSecondEccMember
                       
Conversion of promissory note into Common stock                     698,241us-gaap_DebtConversionConvertedInstrumentSharesIssued1
/ us-gaap_ContingentConsiderationByTypeAxis
= xon_UpfrontMember
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_OragenicsSecondEccMember
         
Upfront | Fibrocell Science, Inc. | Upfront and Milestone Payments                                
Collaboration Agreements [Line Items]                                
Collaborative arrangement consideration received, shares           1,317,520xon_CollaborativeArrangementConsiderationReceivedShares
/ us-gaap_ContingentConsiderationByTypeAxis
= xon_UpfrontMember
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_FibrocellMember
                   
Collaborative arrangement consideration received, value           7,576,000xon_CollaborativeArrangementConsiderationReceivedValue
/ us-gaap_ContingentConsiderationByTypeAxis
= xon_UpfrontMember
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_FibrocellMember
                   
Upfront | Genopaver, LLC | Upfront and Milestone Payments                                
Collaboration Agreements [Line Items]                                
Collaborative arrangement consideration received, value             3,000,000xon_CollaborativeArrangementConsiderationReceivedValue
/ us-gaap_ContingentConsiderationByTypeAxis
= xon_UpfrontMember
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_GenopaverEccMember
                 
Upfront | Intrexon Energy Partners, LLC | Upfront and Milestone Payments                                
Collaboration Agreements [Line Items]                                
Collaborative arrangement consideration received, value                 25,000,000xon_CollaborativeArrangementConsiderationReceivedValue
/ us-gaap_ContingentConsiderationByTypeAxis
= xon_UpfrontMember
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_IntrexonEnergyPartnersMember
      25,000,000xon_CollaborativeArrangementConsiderationReceivedValue
/ us-gaap_ContingentConsiderationByTypeAxis
= xon_UpfrontMember
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_IntrexonEnergyPartnersMember
     
Upfront | ZIOPHARM Oncology, Inc. | Upfront and Milestone Payments                                
Collaboration Agreements [Line Items]                                
Collaborative arrangement consideration received, shares                   3,636,926xon_CollaborativeArrangementConsiderationReceivedShares
/ us-gaap_ContingentConsiderationByTypeAxis
= xon_UpfrontMember
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_ZiopharmMember
           
Collaborative arrangement consideration received, value                   17,457,000xon_CollaborativeArrangementConsiderationReceivedValue
/ us-gaap_ContingentConsiderationByTypeAxis
= xon_UpfrontMember
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_ZiopharmMember
           
Upfront | Ziopharm Oncology ECC Separate Unit of Accounting | Upfront and Milestone Payments                                
Collaboration Agreements [Line Items]                                
Collaboration revenue                   1,115,000xon_CollaborationRevenues
/ us-gaap_ContingentConsiderationByTypeAxis
= xon_UpfrontMember
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_ZiopharmOncologyEccSeparateUnitOfAccountingMember
           
Upfront | Ziopharm Oncology ECC Unit of Accounting One | Upfront and Milestone Payments                                
Collaboration Agreements [Line Items]                                
Deferred revenue                   16,342,000us-gaap_DeferredRevenue
/ us-gaap_ContingentConsiderationByTypeAxis
= xon_UpfrontMember
/ us-gaap_ProductOrServiceAxis
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/ us-gaap_TypeOfArrangementAxis
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Upfront | Persea Bio, LLC | Upfront and Milestone Payments                                
Collaboration Agreements [Line Items]                                
Collaborative arrangement consideration received, value                       5,000,000xon_CollaborativeArrangementConsiderationReceivedValue
/ us-gaap_ContingentConsiderationByTypeAxis
= xon_UpfrontMember
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_PerseaBioLLCMember
       
Supplemental Upfront | Fibrocell Science, Inc. | Upfront and Milestone Payments                                
Collaboration Agreements [Line Items]                                
Collaborative arrangement consideration received, shares                           1,024,590xon_CollaborativeArrangementConsiderationReceivedShares
/ us-gaap_ContingentConsiderationByTypeAxis
= xon_SupplementalUpfrontMember
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_FibrocellMember
1,243,781xon_CollaborativeArrangementConsiderationReceivedShares
/ us-gaap_ContingentConsiderationByTypeAxis
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/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_FibrocellMember
 
Collaborative arrangement consideration received, value                           5,225,000xon_CollaborativeArrangementConsiderationReceivedValue
/ us-gaap_ContingentConsiderationByTypeAxis
= xon_SupplementalUpfrontMember
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
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7,612,000xon_CollaborativeArrangementConsiderationReceivedValue
/ us-gaap_ContingentConsiderationByTypeAxis
= xon_SupplementalUpfrontMember
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_FibrocellMember
 
Milestone One | ZIOPHARM Oncology, Inc. | Upfront and Milestone Payments                                
Collaboration Agreements [Line Items]                                
Collaborative arrangement consideration received, shares                               3,636,926xon_CollaborativeArrangementConsiderationReceivedShares
/ us-gaap_ContingentConsiderationByTypeAxis
= xon_MilestoneOneMember
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
/ us-gaap_TypeOfArrangementAxis
= xon_ZiopharmMember
Collaborative arrangement consideration received, value                               $ 18,330,000xon_CollaborativeArrangementConsiderationReceivedValue
/ us-gaap_ContingentConsiderationByTypeAxis
= xon_MilestoneOneMember
/ us-gaap_ProductOrServiceAxis
= xon_UpfrontAndMilestonePaymentsMember
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= xon_ZiopharmMember