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Intangible assets | 12 Months Ended
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Dec. 31, 2015
Intangible assets |
Intangible assets | 8. Intangible assets The following table sets forth the changes in our intangible assets balance, for all periods presented:
|  | Intangible Assets |
Balance, December 31, 2013 |  | $ | 23,413 |
Amortization expense |  |  | (3,682 | )
Impairment loss |  |  | (55 | )
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Balance, December 31, 2014 |  |  | 19,676 |
Amortization expense |  |  | (3,594 | )
Impairment loss |  |  | (27 | )
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Balance, December 31, 2015 |  | $ | 16,055 |
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During 2015, we recorded impairment losses for the termination of a contract and certain patent applications that we abandoned. During 2014, we recorded impairment losses for certain patent applications that we abandoned. Intangible assets at December 31, 2015 consist of the following:
|  | Historical Cost |  | Accumulated Amortization |  | Net |
Venue contracts |  | $ | 23,630 |  | $ | (11,104 | ) | $ | 12,526 |
Non-compete agreements |  |  | 3,590 |  |  | (1,556 | ) |  | 2,034 |
Technology |  |  | 2,310 |  |  | (1,295 | ) |  | 1,015 |
Advertiser relationships |  |  | 70 |  |  | (48 | ) |  | 22 |
Patents, trademarks and other |  |  | 1,034 |  |  | (576 | ) |  | 458 |
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|  | $ | 30,634 |  | $ | (14,579 | ) | $ | 16,055 |
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Intangible assets at December 31, 2014 consist of the following:
|  | Historical Cost |  | Accumulated Amortization |  | Net |
Venue contracts |  | $ | 36,356 |  | $ | (21,582 | ) | $ | 14,774 |
Non-compete agreements |  |  | 3,840 |  |  | (1,067 | ) |  | 2,773 |
Technology |  |  | 2,300 |  |  | (863 | ) |  | 1,437 |
Advertiser relationships |  |  | 70 |  |  | (34 | ) |  | 36 |
Patents, trademarks and other |  |  | 1,353 |  |  | (697 | ) |  | 656 |
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|  | $ | 43,919 |  | $ | (24,243 | ) | $ | 19,676 |
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The decrease in our intangible assets cost and accumulated amortization balances from 2014 to 2015 related to the write-off of intangible assets that were impaired as well as intangible assets that have expired. Amortization expense for fiscal years 2016 through 2020 and thereafter is as follows:
Year |  | Amortization Expense |
2016 |  | $ | 3,451 |
2017 |  |  | 3,221 |
2018 |  |  | 2,372 |
2019 |  |  | 1,634 |
2020 |  |  | 1,556 |
Thereafter |  |  | 3,821 |
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|  | $ | 16,055 |
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