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Intangible Assets | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | 7. 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):
|  | 2020 |  |  | 2019 |
Patent costs |  | $ | 1,859 |  |  | $ | 1,992 |
Accumulated amortization |  |  | (1,434 | ) |  |  | (1,483 | )
|  | $ | 425 |  |  | $ | 509 |
Definite lived intangible assets, such as patent rights, are amortized and tested for impairment if a triggering event occurs. Amortization expense was approximately $106,000, $108,000 and $119,000 in 2020, 2019 and 2018, respectively. The estimated future amortization expense from patent assets held as of December 31, 2020, is projected to be $96,000, $64,000, $54,000, $46,000 and $33,000, in fiscal years 2021, 2022, 2023, 2024, and 2025, 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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