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Summary of Significant Accounting Policies (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Summary of Significant Accounting Policies    
Cash and cash equivalents $ 5,879,000 $ 7,128,000
Restricted cash 85,000 0
Total cash, cash equivalents and retricted cash $ 5,964,000 $ 7,128,000