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Organization and Basis of Presentation - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 1 Months Ended 12 Months Ended
Mar. 26, 2014
Aug. 13, 2013
Jul. 26, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 20, 2014
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]              
Reverse stock split ratio     1-for-1.75        
Reverse stock split ratio     0.57143us-gaap_StockholdersEquityNoteStockSplitConversionRatio1        
Shares of common stock 972,004us-gaap_StockIssuedDuringPeriodSharesNewIssues            
Price per share of common stock $ 25.72us-gaap_SharePrice            
Aggregate proceeds from the IPO       $ 0us-gaap_ProceedsFromIssuanceInitialPublicOffering $ 168,801us-gaap_ProceedsFromIssuanceInitialPublicOffering $ 0us-gaap_ProceedsFromIssuanceInitialPublicOffering  
Shares of common stock   79,705,130us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities          
Number of authorized shares of common stock   200,000,000us-gaap_CommonStockSharesAuthorized   200,000,000us-gaap_CommonStockSharesAuthorized 200,000,000us-gaap_CommonStockSharesAuthorized    
Number of authorized shares of preferred stock   25,000,000us-gaap_PreferredStockSharesAuthorized          
Exemplar Genetics, LLC              
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]              
Parent ownership interest       51.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_BusinessAcquisitionAxis
= xon_ExemplarGeneticsLLCMember
     
AquaBounty Technologies, Inc.              
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]              
Parent ownership interest       60.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_BusinessAcquisitionAxis
= xon_AquaBountyMember
    59.85%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_BusinessAcquisitionAxis
= xon_AquaBountyMember
Biological & Popular Culture, Inc.              
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]              
Parent ownership interest       51.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_BusinessAcquisitionAxis
= xon_BioPopMember
     
IPO              
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]              
Shares of common stock   11,499,998us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_IPOMember
         
Price per share of common stock   16.00us-gaap_SharePrice
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_IPOMember
         
Aggregate proceeds from the IPO   168,300us-gaap_ProceedsFromIssuanceInitialPublicOffering
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_IPOMember
         
Underwriting discounts and commissions   12,900us-gaap_ExpenseRelatedToDistributionOrServicingAndUnderwritingFees
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_IPOMember
         
Offering expense paid   2,800us-gaap_PaymentsOfFinancingCosts
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_IPOMember
         
Capitalized expenses   2,300us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_IPOMember
         
Exercise of Overallotment Option by Underwriters              
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]              
Shares of common stock   1,499,999us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= xon_OverallotmentOptionExerciseByUnderwritersMember