Related Party Transactions - Summary of Management Expenses (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other Underwriting Expenses [Member]
Related Party Transaction [Line Items]
Management fees	$ 879,615	$ 1,411,065	$ 3,459,174	$ 4,401,032