INTANGIBLES AND OTHER ASSETS Long-lived intangible assets and other assets consisted of the following: | | | | | | | | | | | | | | | | | | | | | | | | | | Dollars in Thousands | | March 31, 2013 | | December 31, 2012 | | Cost | | Accumulated Amortization | | Net Book Value | | Cost | | Accumulated Amortization | | Net Book Value | Intangibles—acquired technology | $ | 9,009 |
| | $ | 2,226 |
| | $ | 6,783 |
| | $ | 9,009 |
| | $ | 1,910 |
| | $ | 7,099 |
| Intangibles—assay royalties | 1,434 |
| | 461 |
| | 973 |
| | 1,434 |
| | 410 |
| | 1,024 |
| Intangibles—third party payor relationships | 367 |
| | 55 |
| | 312 |
| | 367 |
| | 49 |
| | 318 |
| Intangibles—tradenames and trademarks | 824 |
| | 145 |
| | 679 |
| | 824 |
| | 115 |
| | 709 |
| Intangibles—customer relationships | 652 |
| | 22 |
| | 630 |
| | 652 |
| | 11 |
| | 641 |
| Intangibles—covenants not to compete | 184 |
| | 31 |
| | 153 |
| | 184 |
| | 15 |
| | 169 |
| Patents | 975 |
| | 293 |
| | 682 |
| | 929 |
| | 280 |
| | 649 |
| Intellectual property | 170 |
| | 20 |
| | 150 |
| | 170 |
| | 15 |
| | 155 |
| | $ | 13,615 |
| | $ | 3,253 |
| | $ | 10,362 |
| | $ | 13,569 |
| | $ | 2,805 |
| | $ | 10,764 |
|
| | | | | | Estimated Useful Life | Acquired technology | 7-8 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 |
Other assets include U.S. security deposits and deferred tax assets, net of applicable valuation allowances. Amortization expense for intangible assets was $0.5 million and $0.3 million during the three months ended March 31, 2013 and 2012, respectively. Amortization expense for intangible assets is expected to be $1.7 million in each of the years 2013 through 2017. |