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Shareholders' Equity - Additional Information (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Mar. 26, 2014 | Jan. 31, 2015 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 26, 2014
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |
Securities purchase agreements, shares | 972,004 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 4,312,500 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |
Price per share of common stock | $ 25.72 us-gaap_SharePrice | $ 27.00 us-gaap_SharePrice |  |  | $ 25.72 us-gaap_SharePrice
Proceeds from issuance of shares in a public offering, net of issuance costs |  | $ 110,041 xon_ProceedsfromIssuanceofCommonStockNetofIssuanceCosts | $ 110,041 xon_ProceedsfromIssuanceofCommonStockNetofIssuanceCosts | $ 0 xon_ProceedsfromIssuanceofCommonStockNetofIssuanceCosts |
Underwriting discounts and commissions |  | 6,086 us-gaap_ExpenseRelatedToDistributionOrServicingAndUnderwritingFees |  |  |
Offering expenses capitalized by the Company |  | 311 us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts |  |  |
Securities purchase agreements gross proceed | 25,000 us-gaap_ProceedsFromIssuanceOfPrivatePlacement |  | 0 us-gaap_ProceedsFromIssuanceOfPrivatePlacement | 25,000 us-gaap_ProceedsFromIssuanceOfPrivatePlacement |
Securities purchase agreements, value |  |  | 110,041 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |
Affiliates of Third Security |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |
Securities purchase agreements, shares | 243,001 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = xon_AffiliatesOfThirdSecurityMember | 555,556 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = xon_AffiliatesOfThirdSecurityMember |  |  |
Securities purchase agreements, value | $ 6,250 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = xon_AffiliatesOfThirdSecurityMember |  |  |  |
Overallotment Option Exercise By Underwriters |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |
Securities purchase agreements, shares |  | 562,500 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = xon_OverallotmentOptionExerciseByUnderwritersMember |  |  |

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