Basis of Presentation and Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents and Restricted Cash Reported (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Money market accounts – cash equivalents	$ 34,778,166	$ 32,150,342
Cash	12,214,901	18,404,749
Total cash and cash equivalents	46,993,067	50,555,091	$ 41,161,115
Restricted cash	2,500,000	2,500,000	2,500,000
Total cash, cash equivalents and restricted cash	$ 49,493,067	$ 53,055,091	$ 43,661,115	$ 56,114,735