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Intangible Assets | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | 9. INTANGIBLE ASSETS Patent costs, which are included in other assets in the accompanying Consolidated Balance Sheets, as of December 31 were as follows (in thousands):
|  | 2018 |  |  | 2017 |
Patent costs |  | $ | 1,979 |  |  | $ | 2,093 |
Accumulated amortization |  |  | (1,380 | ) |  |  | (1,386 | )
|  | $ | 599 |  |  | $ | 707 |
Definite lived intangible assets, such as patent rights, are amortized and tested for impairment if a triggering event occurs. Amortization expense was approximately $ 119,000 , $ 130,000 and $ 134,000 in 2018, 2017 and 2016, respectively. The estimated future amortization expense from patent assets held as of December 31, 2018, is projected to be $ 108,000 , $ 103,000 , $ 93,000 , $ 62,000 and $ 51,000 , in fiscal years 2019, 2020, 2021, 2022, and 2023, respectively.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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