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License Agreement - Additional Information (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended
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Jan. 31, 2015
Other Commitments [Line Items] |
Shares issued as consideration of license agreement (in shares) | 2,100,085 xon_StockIssuedDuringPeriodSharesIssuedforLicenseAgreement
Research and development |
Other Commitments [Line Items] |
Payment of license fees | 59,579 xon_PaymentOfLicenseFees / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember
ZIOPHARM Oncology, Inc. |
Other Commitments [Line Items] |
Annual funding commitment, term | 3 years
Minimum | ZIOPHARM Oncology, Inc. |
Other Commitments [Line Items] |
Annual funding commitment, amount | 15,000 xon_AnnualFundingCommitment / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = xon_ZiopharmMember
Maximum | ZIOPHARM Oncology, Inc. |
Other Commitments [Line Items] |
Annual funding commitment, amount | 20,000 xon_AnnualFundingCommitment / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = xon_ZiopharmMember

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- Definition Amount of annual funding commitment. + References No definition available. + Details
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Namespace Prefix: | xon_
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Balance Type: | credit
Period Type: | instant

X
- Definition Term for the annual funding commitment in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition License fee paid upon execution of agreement + References No definition available. + Details
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- Definition Number of shares issued in lieu of cash for license agreement entered into by the entity. + References No definition available. + Details
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