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F. INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible assets |
|  | 2016 |
|  | Gross |  | Accumulated |  | Intangible |
|  | Amount |  | amortization |  | assets, net |
|  | (in thousands) |
Patents |  | $ | 5,987 |  | $ | (1,997) |  | $ | 3,990 |
Trademarks |  |  | 14 |  |  | (11) |  |  | 3 |
Total intangible assets |  | $ | 6,001 |  | $ | (2,008) |  | $ | 3,993 |
|  | 2015 |
|  | Gross |  | Accumulated |  | Intangible |
|  | Amount |  | amortization |  | assets, net |
|  | (in thousands) |
Patents |  | $ | 5,446 |  | $ | (1,551) |  | $ | 3,895 |
Trademarks |  |  | 14 |  |  | (9) |  |  | 5 |
Total intangible assets |  | $ | 5,460 |  | $ | (1,560) |  | $ | 3,900 |
Approximate amortization expense for intangible assets | At December 31, 2016, approximate amortization expense for intangible assets was as follows (in thousands):
2017 |  | $ | 466 |
2018 |  |  | 466 |
2019 |  |  | 466 |
2020 |  |  | 466 |
2021 |  |  | 467 |
thereafter |  |  | 1,662 |
|  | $ | 3,993 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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