XML 94 R80.htm IDEA: XBRL DOCUMENT v3.19.1

Operating Leases - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Termination period	1 year
Operating lease commitment not yet commenced	$ 2,800
Minimum
Lessee, Lease, Description [Line Items]
Term of contract	1 year
Operating leases not yet commenced, term of contract	3 years
Maximum
Lessee, Lease, Description [Line Items]
Term of contract	20 years
Operating leases not yet commenced, term of contract	6 years

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

+ Details

Name:	us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Lessee, Operating Lease, Remaining Lease Term

+ References

No definition available.

+ Details

Name:	xon_LesseeOperatingLeaseRemainingLeaseTerm
Namespace Prefix:	xon_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Lessee, Operating Lease, Termination Period

+ References

No definition available.

+ Details

Name:	xon_LesseeOperatingLeaseTerminationPeriod
Namespace Prefix:	xon_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Commitments under operating leases that have not yet commenced as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	xon_OperatingLeaseLeaseNotyetCommencedExpense
Namespace Prefix:	xon_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: