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Patents and Other Intangible Assets - Future amortization expense (Details)
Sep. 30, 2020
USD ($)
Patents and Other Intangible Assets  
2020 (remaining 3 months) $ 42,000
2021 131,000
2022 104,000
2023 70,000
2024 43,000
Thereafter 10,000
Finite-Lived Intangible Assets, Net $ 400,000