Summary of Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Summary of Significant Accounting Policies
Cash and cash equivalents	$ 14,052,417	$ 14,401,257
Restricted cash included in other assets	561,294	558,261
Cash, cash equivalents and restricted cash in the statement of cash flows	$ 14,613,711	$ 14,959,518	$ 10,555,717