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Operating Income | 12 Months Ended
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Dec. 31, 2017
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Operating Income | Note 15: Operating Income The operating income is broken down in the following manner:
|  | December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | (thousands of Euros) |
Revenues |  |  | 202 |  |  |  | — |  |  |  | — |
Research tax credit |  |  | 5,685 |  |  |  | 7,228 |  |  |  | 9,330 |
Subsidies |  |  | 279 |  |  |  | 303 |  |  |  | 271 |
Other operating income |  |  | — |  |  |  | 1,554 |  |  |  | 2,308 |
Total |  |  | 6,166 |  |  |  | 9,084 |  |  |  | 11,909 |
The revenues of the Company are composed of the sales of Diallertest® products whose commercialization was discontinued on September 1, 2015. As of December 31, 2016 and 2017, the Company also recorded as other income a portion of the upfront fee and milestones agreed under the contract with Nestlé which are deferred over the performance obligation. As of December 31, 2017, we had recorded deferred revenue of €9.5 million related to our collaboration with Nestlé Health Science, which will be deferred and recognized ratably over the service obligation period. We expect the service obligation period to be completed in the second half of 2021.

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- Definition The disclosure of other operating income. [Refer: Other operating income (expense)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_10_e&doctype=Standard -URIDate 2017-03-09 + Details
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