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INTANGIBLE ASSETS AND OTHER ASSETS | 12 Months Ended
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Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets and Other Assets | INTANGIBLE ASSETS AND OTHER ASSETS Long-lived intangible assets and other assets consisted of the following:
| Dollars in Thousands
| December 31, 2014 |  | December 31, 2013
| Cost |  | Accumulated Amortization |  | Net Book Value |  | Cost |  | Accumulated Amortization |  | Net Book Value
Acquired technology | $ | 9,009 |  |  | $ | 3,995 |  |  | $ | 5,014 |  |  | $ | 9,009 |  |  | $ | 3,175 |  |  | $ | 5,834 |
Assay royalties | 1,434 |  |  | 819 |  |  | 615 |  |  | 1,434 |  |  | 614 |  |  | 820 |
Third party payor relationships | 367 |  |  | 98 |  |  | 269 |  |  | 367 |  |  | 73 |  |  | 294 |
Tradenames and trademarks | 824 |  |  | 351 |  |  | 473 |  |  | 824 |  |  | 233 |  |  | 591 |
Customer relationships | 652 |  |  | 98 |  |  | 554 |  |  | 652 |  |  | 54 |  |  | 598 |
Covenants not to compete | 184 |  |  | 138 |  |  | 46 |  |  | 184 |  |  | 77 |  |  | 107 |
Patents | 1,198 |  |  | 385 |  |  | 813 |  |  | 1,153 |  |  | 336 |  |  | 817 |
Intellectual property | 266 |  |  | 86 |  |  | 180 |  |  | 170 |  |  | 36 |  |  | 134 |
| $ | 13,934 |  |  | $ | 5,970 |  |  | $ | 7,964 |  |  | $ | 13,793 |  |  | $ | 4,598 |  |  | $ | 9,195 |
| Estimated Useful Life
Acquired technology | 7 – 10 years
Assay royalties | 7 years
Third party payor relationships | 15 years
Tradenames and trademarks | 7 years
Customer relationships | 15 years
Covenants not to compete | 3 years
Patents | Life of the patent
Intellectual property | 7 years
Amortization expense for intangible assets was $1.4 million, $1.8 million and $1.4 million during the years ended December 31, 2014, 2013 and 2012. At December 31, 2013, the Company revised its estimate of useful lives on certain intangible assets which caused amortization expense in 2014 to decrease by $0.4 million. Amortization expense for intangible assets for each of the five succeeding fiscal years is expected to be $1.4 million, $1.3 million, $1.3 million, $1.0 million and $0.9 million for the years ended December 31, 2015, 2016, 2017, 2018 and 2019, respectively. Other assets include U.S. security deposits and deferred tax assets, net of applicable valuation allowances.

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