Manager and Other Related Parties - Formation Loan Transactions (Details) - USD ($)	3 Months Ended	102 Months Ended
	Mar. 31, 2018	Mar. 31, 2018
Formation Loan Transactions [Abstract]
Balance, beginning of period	$ 3,777,088
Formation loan advances to RMC	357,794	$ 5,017,741
Payments received from RMC		(854,077)
Early withdrawal penalties applied	(1,051)	(29,833)
Balance, March 31, 2018	$ 4,133,831	4,133,831
Subscription proceeds since inception		$ 71,490,002
Formation loan advance rate		7.00%