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Intangible Assets | 9 Months Ended
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Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets Intangible assets consisted of the following:
(in thousands) | September 30, 2021 |  | December 31, 2020
Patents | $ | 431 |  |  | $ | 430 |
Less accumulated amortization | (206) |  |  | (172) |
| $ | 225 |  |  | $ | 258 |
The weighted average useful life of the intangible assets was 9.87 years. For the three months ended September 30, 2021 and 2020, amortization expense was $0.0 million and $0.0 million, respectively.

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- Definition The entire disclosure for all or part of the information related to 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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