Escrowed Cash - Schedule of Escrowed Cash Restricted (Detail) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Restricted Cash and Cash Equivalents Items [Line Items]
Net Escrowed cash restricted	$ 1,880,231	$ 263,558
Interest-Bearing Deposits [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Net Escrowed cash restricted	1,864,132	244,559
Security Deposit [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Net Escrowed cash restricted	$ 16,099	$ 18,999