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 ($)
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Accounting Policies [Abstract]        
Cash and cash equivalents $ 2,385,653 $ 3,990,160    
Restricted cash 302,072 263,405    
Total cash, cash equivalents, and restricted cash as shown in our unaudited consolidated statements of cash flows $ 2,687,725 $ 4,253,565 $ 1,316,376 $ 1,712,266