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Patents and Other Intangible Assets - Future amortization expense (Details)
Mar. 31, 2020
USD ($)
Patents and Other Intangible Assets  
2020 (remaining 9 months) $ 109,000
2021 111,000
2022 83,000
2023 49,000
2024 22,000
Finite-Lived Intangible Assets, Net $ 374,000