Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details)

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Summary of Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Accounting Policies [Abstract]        
Cash and cash equivalents $ 2,527,319 $ 1,614,771    
Restricted cash 231,505 340,672    
Total cash, cash equivalents, and restricted cash as shown in our unaudited consolidated statements of cash flows $ 2,758,824 $ 1,955,443 $ 1,917,534 $ 4,253,565