Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Accounts Receivable, net of Allowance for Doubtful Accounts (Details)

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Summary of Significant Accounting Policies - Accounts Receivable, net of Allowance for Doubtful Accounts (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]    
Allowance for doubtful accounts $ 235,000 $ 646,000