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Patents and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2021
Patents and Other Intangible Assets |
Schedule of Patents and other intangible assets | Patents and other intangible assets are summarized as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, |  | December 31,
​ | ​ | 2021 | ​ | 2020
Patents |  | ​ |  |  | ​ |
Patents pending | ​ | $ | 596,000 | ​ | $ | 731,000
Issued patents | ​ |  | 538,000 | ​ |  | 883,000
​ | ​ |  | 1,134,000 | ​ |  | 1,614,000
Trademarks | ​ |  | ​ | ​ |  | ​
Trademarks pending | ​ |  | 1,000 | ​ |  | 105,000
Registered trademarks | ​ |  | 95,000 | ​ |  | 23,000
​ | ​ |  | 96,000 | ​ |  | 128,000
Other | ​ |  | 8,000 | ​ |  | 8,000
​ | ​ |  | 1,238,000 | ​ |  | 1,750,000
Accumulated amortization | ​ |  | (296,000) | ​ |  | (448,000)
​ | ​ | $ | 942,000 | ​ | $ | 1,302,000
​
Schedule of future amortization expense | Future amortization expense associated with issued patents and registered trademarks as of September 30, 2021 is as follows: ​
​ | ​ | ​ | ​
2021 (remaining 3 months) |  | $ | 28,000
2022 | ​ |  | 114,000
2023 | ​ |  | 91,000
2024 | ​ |  | 67,000
2025 | ​ |  | 32,000
Thereafter | ​ | ​ | 6,000
​ | ​ | $ | 338,000

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