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Patents and Other Intangible Assets - Future amortization expense (Details)
Jun. 30, 2020
USD ($)
Patents and Other Intangible Assets  
2020 (remaining 6 months) $ 76,000
2021 118,000
2022 90,000
2023 57,000
2024 29,000
Thereafter 3,000
Finite-Lived Intangible Assets, Net $ 373,000