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Patents and Other Intangible Assets - Future amortization expense (Details)
Jun. 30, 2019
USD ($)
Patents and Other Intangible Assets  
2019 (remaining 6 months) $ 67,000
2020 130,000
2021 94,000
2022 66,000
2023 33,000
Thereafter 6,000
Finite-Lived Intangible Assets, Net $ 396,000