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Patents and Other Intangible Assets - Future amortization expense (Details)
Mar. 31, 2021
USD ($)
Patents and Other Intangible Assets  
2021 (remaining 9 months) $ 114,000
2022 125,000
2023 91,000
2024 63,000
Thereafter 27,000
Finite-Lived Intangible Assets, Net $ 420,000