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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2016
Patents [Member] |
Schedule of Patent Cost and Other Asset | Patent costs, which are included in other assets in the accompanying balance sheets, as of December 31 were as follows (in thousands):
|  | 2016 |  |  | 2015 |
Patent costs |  | $ | 2,427 |  |  | $ | 2,525 |
Accumulated amortization |  |  | (1,598 | ) |  |  | (1,583 | )
|  | $ | 829 |  |  | $ | 942 |

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