Number of shares of equity interests issued or issuable to acquire entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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Balance Type:	na
Period Type:	duration

- 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

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

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- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e1043-128460

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Balance Type:	debit
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- Definition

Useful life of finite-lived intangible assets, 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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Data Type:	xbrli:durationItemType
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Period Type:	duration

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585

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Balance Type:	credit
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- Definition

Amount of consideration transferred in a business combination related to cash and working capital adjustments.

+ References

No definition available.

+ Details

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

- Definition

Number of shares of equity interests issued or issuable to acquire entity which were withheld as escrow.

+ References

No definition available.

+ Details

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- Definition

Portion of cash consideration in a business combination withheld as escrow.

+ References

No definition available.

+ Details

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- Definition

Period following the closing date of a business combination at which time consideration withheld as escrow is due to be paid by the entity.

+ References

No definition available.

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Mergers and Acquisitions - Oxitec - Additional Information (Details) - Oxitec Limited - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Nov. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Business Acquisition [Line Items]
Percentage of outstanding common stock acquired		100.00%
Business combination, consideration paid, shares issued		1,359,343
Cash		$ 90,199
Business combination, consideration transferred, cash and working capital adjustments		$ 9,449
Business combination, equity interest issued or issuable, number of shares withheld as escrow		480,422
Business combination, cash consideration withheld as escrow		$ 1,991
Business combination, consideration withheld as escrow, transfer period after closing		18 months
Expected useful life of intangible asset	18 years
Selling, general and administrative
Business Acquisition [Line Items]
Business combination, acquisition related cost			$ 1,675