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Intangible assets, net | 12 Months Ended
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Dec. 31, 2017
Intangible assets, net |
Intangible assets, net | 13. Intangible assets, net The composition and movement of intangible assets is as follows:
|  |  |  | Gross value |  | Accumulated amortization |  | Net carrying amount |
|  | Useful |  | At December 31, |
|  | life |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016 |
Software |  | 1 – 4 years |  | Ps. | 441,803 |  | Ps. | 313,028 |  | Ps. | (251,383 | ) | Ps. | (198,987 | ) | Ps. | 190,420 |  | Ps. | 114,041 |
Balance as of January 1, 2016 |  | Ps. | 94,649 |
Additions |  | 60,792 |
Disposals |  | (1,277 | )
Amortization |  | (40,290 | )
Exchange differences |  | 167 |
Balance as of December 31, 2016 |  | 114,041 |
Additions |  | 130,908 |
Disposals |  | (1,976 | )
Amortization |  | (52,396 | )
Exchange differences |  | (157 | )
Balance as of December 31, 2017 |  | Ps. | 190,420 |
Software amortization expense for the years ended December 31, 2017, 2016 and 2015 was Ps.52,396, Ps.40,290 and Ps.31,278, respectively. These amounts were recognized in depreciation and amortization in the consolidated statements of operations.

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- Definition The entire disclosure for intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=sect_Disclosure&doctype=Standard -URIDate 2017-03-09 + Details
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