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

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- Definition

Amount of annual funding commitment.

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- 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.

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- Definition

License fee paid upon execution of agreement

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- Definition

Number of shares issued in lieu of cash for license agreement entered into by the entity.

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