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Customer Accounts Receivable and Other Current Assets | 12 Months Ended
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Dec. 31, 2017
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Customer Accounts Receivable and Other Current Assets | Note 8: Customer Accounts Receivable and Other Current Assets 8.1 Customer Accounts Receivable and Related Receivables
|  | December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | (thousands of Euros) |
Accounts receivable |  |  | 13 |  |  |  | 1,263 |  |  |  | 1,265 |
Valuation allowance |  |  | (13 | ) |  |  | (13 | ) |  |  | — |
Total net value of accounts receivable |  |  | — |  |  |  | 1,250 |  |  |  | 1,265 |
All the customer accounts receivable have payment terms of less than one year. As of December 31, 2016, and 2017, the accounts receivable correspond primarily to the amounts due under collaboration agreement with Nestlé Health Science. As of December 31, 2015, accounts receivable correspond primarily to the sales of Diallertest®. The Company discontinued its commercial partnership with respect to the product in the second half of 2015. 8.2 Other current assets The other current assets are broken down as follows:
|  | December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | (thousands of Euros) |
Research tax credit |  |  | 5,702 |  |  |  | 7,228 |  |  |  | 9,217 |
Other tax claims |  |  | 2,550 |  |  |  | 2,618 |  |  |  | 5,258 |
Other receivables |  |  | 1,409 |  |  |  | 1,883 |  |  |  | 1,192 |
Prepaid expenses |  |  | 1,850 |  |  |  | 2,725 |  |  |  | 2,054 |
Total |  |  | 11,512 |  |  |  | 14,454 |  |  |  | 17,721 |
The other tax debt claims are primarily related to the deductible VAT as well as the reimbursement of VAT that has been requested. Prepaid expenses are comprised primarily of rental and insurance expenses, as well as legal and scientific consulting fees. As of December 31,2016, and 2017, prepaid expenses also included upfront payments, which are recognized over the term of the ongoing clinical studies. Research Tax Credit The Company benefits from the provisions in Articles 244 quater B and 49 septies F of the French Tax Code related to the Research Tax Credit. In compliance with the principles described in Note 3.12, the Research Tax Credit is posted to the accounts as “Other Income” in the Consolidated Statements of (Loss) during the year with which the eligible research expenditures are associated. The changes in this Research Tax Credit over the last three years are presented as follows:
|  | thousands of Euros |
Opening Balance Sheet Receivable as of January 1, 2015 |  |  | 4,340 |
+ Other income |  |  | 5,702 |
- Payment received |  |  | (4,322 | )
- Adjustment |  |  | (18 | )
Closing Balance Sheet Receivable as of December 31, 2015 |  |  | 5,702 |
|  | thousands of Euros |
Opening Balance Sheet Receivable as of January 1, 2016 |  |  | 5,702 |
+ Other income |  |  | 7,228 |
- Payment received |  |  | (5,702 | )
- Adjustment |  |  | — |
Closing Balance Sheet Receivable as of December 31, 2016 |  |  | 7,228 |
|  | thousands of Euros |
Opening Balance Sheet Receivable as of January 1, 2017 |  |  | 7,228 |
+ Other income |  |  | 9,217 |
- Payment received |  |  | (7,341 | )
- Adjustment |  |  | 113 |
Closing Balance Sheet Receivable as of December 31, 2017 |  |  | 9,217 |
The adjustments to the amount of the receivable in 2015 reflect the penalties related to the tax inspection of the 2014 Research Tax Credit that occurred in 2015. Following a tax inspection led by the French tax authorities during fiscal years 2012, 2013 and 2014, on July 4, 2016, the Company received a tax reassessment notification primarily affecting the Research Tax Credit. The proposed adjustment amounted to €0.9 million. After examination, the Research Tax Credit Advisory Committee (“Comité consultatif du credit d’impôt pour dépenses de recherche”) confirmed the reassessment in a decision sent to the Company on July 6, 2017. The tax administration therefore maintained the tax reassessment. In December 2017, the Company appealed to a higher tax authority, which is the last resort before potential litigation. However, the probability of obtaining tax relief is considered very low. As a result, a provision has been recorded in the consolidated financial statement as of December 31, 2017.

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- Definition The disclosure of trade and other receivables. [Refer: Trade and other receivables] + 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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