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Summary of Significant Accounting Policies (Details 3) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Accounting Policies [Abstract] |  |
Gross cost | $ 4,000,000 | $ 4,000,000
Accumulated amortization | (4,000,000) | (3,683,000)
Net carrying amount | $ 0 | $ 317,000

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