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Intangible Assets from Acquisitions | 9 Months Ended
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Sep. 30, 2013
Intangible Assets from Acquisitions | (11) Intangible Assets from Acquisitions Intangible assets from acquisitions consisted of the following (in thousands):
|  | As of December 31, 2012 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization(1) |  |  | Net |
Advertiser relationship |  | $ | 3,070 |  |  | $ | (2,125 | ) |  | $ | 945 |
Distribution partner relationship |  |  | 4,830 |  |  |  | (2,787 | ) |  |  | 2,043 |
Acquired technology |  |  | 2,760 |  |  |  | (2,388 | ) |  |  | 372 |
|  | $ | 10,660 |  |  | $ | (7,300 | ) |  | $ | 3,360 |
|  | As of September 30, 2013 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization(1) |  |  | Net |
Advertiser relationship |  | $ | 3,070 |  |  | $ | (3,046 | ) |  | $ | 24 |
Distribution partner relationship |  |  | 4,830 |  |  |  | (3,994 | ) |  |  | 836 |
|  | $ | 7,900 |  |  | $ | (7,040 | ) |  | $ | 860 |
(1) | Excludes the original cost and accumulated amortization of fully-amortized intangible assets which were $82.1 million and $84.7 million at December 31, 2012 and September 30, 2013, respectively.
Amortizable intangible assets are amortized on a straight-line basis over their useful lives. Amortization expense incurred by the Company was approximately $1.1 million and $709,000 for the three months ended September 30, 2012 and 2013, respectively, and was $3.7 million and $2.5 million for the nine months ended September 30, 2012 and 2013, respectively. Based upon the current amount of intangible assets subject to amortization, the estimated amortization expense for the next five years is as follows: $427,000 for the remainder of 2013, $433,000 in 2014, and $0 thereafter.

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- Definition Disclosure of finite-lived intangible assets acquired as part of a business combination, by major class (assets that can be grouped together because they are similar, either by their nature or by their use in operations of the entity) and in total, including the value of the asset acquired, any significant residual value (the expected value of the asset at the end of its useful life) and the weighted-average amortization period. + References No definition available. + Details
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