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INTANGIBLE ASSETS AND OTHER ASSETS | 12 Months Ended
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Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
INTANGIBLE ASSETS AND OTHER ASSETS | INTANGIBLE ASSETS AND OTHER ASSETS During the year ended December 31, 2016, we recorded impairment charges of $0.3 million related to our patents. In 2015, we performed an impairment test as of September 30, 2015 due to the significant decline in the market price of our stock. As a result of this testing, we recorded impairment charges related to our long-lived assets of approximately $7.0 million during the three months ended September 30, 2015. The impairment charges included $0.8 million related to property and equipment and $6.2 million related to amortizable intangibles. Long-lived intangible assets and other assets consisted of the following:
| Dollars in Thousands
| December 31, 2016
| Cost |  | Accumulated Amortization |  | Net Book Value
Patents | $ | 233 |  |  | $ | 26 |  |  | $ | 207 |
Intellectual property | 672 |  |  | 317 |  |  | 355 |
| $ | 905 |  |  | $ | 343 |  |  | $ | 562 |
| Dollars in Thousands
| December 31, 2015
| Cost |  | Accumulated Amortization |  | Net Book Value
Patents | $ | 773 |  |  | $ | 67 |  |  | $ | 706 |
Intellectual property | 671 |  |  | 207 |  |  | 464 |
| $ | 1,444 |  |  | $ | 274 |  |  | $ | 1,170 |
| Estimated Useful Life
Patents | 13.5 years
Intellectual property | 7 years
During the year ended December 31, 2016, we impaired patents having a carrying value of $0.3 million. This cost is included in our research and development expense in our accompanying consolidated statements of operations. Also during 2016, we assigned and sold certain patents having a carrying value of $0.2 million. This cost is included in our loss on sale/disposal of assets in our accompanying consolidated statements of operations. Amortization expense for intangible assets was $0.2 million and $0.1 million during the years ended December 31, 2016 and 2015, respectively. Amortization expense for intangible assets for each of the five succeeding fiscal years is expected to be $0.1 million, $0.1 million, $0.1 million, less than $0.1 million and less than $0.1 million for the years ended December 31, 2017, 2018, 2019, 2020 and 2021, respectively. Other assets include security deposits.

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