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Commitments and Contingencies - Purchase Commitments - Additional Information (Details) $ in Thousands | Jun. 30, 2017 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |
Outstanding contractual purchase commitments | $ 8,236

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services under long-term purchase commitments. + References No definition available. + Details
Name: | xon_LongtermPurchaseCommitmentRemainingMinimumAmountCommitted
Namespace Prefix: | xon_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant