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Patents and Other Intangible Assets - Future amortization expense (Details)
Sep. 30, 2019
USD ($)
Patents and Other Intangible Assets  
2019 (remaining 3 months) $ 31,000
2020 123,000
2021 90,000
2022 54,000
2023 21,000
Thereafter 6,000
Finite-Lived Intangible Assets, Net $ 325,000