Name:	us-gaap_ProfessionalAndContractServicesExpense
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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Value of additional common stock for which the entity has committed to purchasing from collaborator, original

No definition available.

Name:	xon_AdditionalSharesValueAgreedToPurchase
Namespace Prefix:	xon_
Data Type:	xbrli:monetaryItemType
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Revenue from contractual agreements with collaborators whereby the collaborators obtain exclusive access to the entity's proprietary technologies for use in the research, development and commercialization of products and/or treatments in a contractually specified field of use. Includes revenue recognized from upfront payments received upon consummation of the agreement, reimbursements for costs incurred by the entity for research and development efforts, and milestone payments received upon achievement of specified development, regulatory and commercial activities as defined in the collaboration agreements.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Value of promissory note received as consideration of collaboration agreement which can be settled in cash or common stock.

No definition available.

Name:	xon_CollaborativeArrangementConsiderationReceivedValueOfConvertiblePromissoryNote
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Data Type:	xbrli:monetaryItemType
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Compensation expense recognized for value of services contributed by a shareholder

No definition available.

Name:	xon_ContributionOfServicesByShareholder
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Percentage of shares of common stock that the entity is entitled to purchase in the open market, maximum.

No definition available.

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Data Type:	num:percentItemType
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Percentage of shares that the entity is entitled to purchase in securities offerings conducted by collaborator, maximum.

No definition available.

Name:	xon_MaximumPercentageOfSharesEntitledToPurchase
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Data Type:	num:percentItemType
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Interest rate per annum of the note receivable.

No definition available.

Name:	xon_NoteReceivableInterestRate
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Data Type:	num:percentItemType
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Value of additional common stock for which the entity has committed to purchasing from collaborator, remaining

No definition available.

Name:	xon_SharesPurchaseCommitmentRemainingValue
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Data Type:	xbrli:monetaryItemType
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Number of shares of common stock purchased from collaborator

No definition available.

Name:	xon_SharesPurchasedFromCollaborativePartners
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Period Type:	duration

Value of common stock purchased from collaborator

No definition available.

Name:	xon_SharesPurchasedFromCollaborativePartnersValue
Namespace Prefix:	xon_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Price per share of collaborator's common stock purchased

No definition available.

Name:	xon_SharesPurchasedPricePerShare
Namespace Prefix:	xon_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

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