Subsequent Events - Additional Information (Detail) - USD ($)			1 Months Ended	3 Months Ended
		May 13, 2019	Apr. 30, 2019	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Subsequent Event [Line Items]
Gross proceeds from issuance of common stock				$ 1,919,474	$ 15,512,031
Outstanding balance				207,900,295
Utah Bridge Loan [Member]
Subsequent Event [Line Items]
Outstanding balance	[1]			$ 12,195,108		$ 12,195,108
Subsequent Event [Member]
Subsequent Event [Line Items]
Gross proceeds from issuance of common stock		$ 4,200,000
Subsequent Event [Member] | Utah Bridge Loan [Member]
Subsequent Event [Line Items]
Repayment of loan			$ 750,000
Outstanding balance			$ 11,400,000
Class A Common Stock [Member]
Subsequent Event [Line Items]
Sale of shares of common stock				286,000
Class A Common Stock [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Sale of shares of common stock		300,000
Class T Common Stock [Member]
Subsequent Event [Line Items]
Sale of shares of common stock				52,000
Class T Common Stock [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Sale of shares of common stock		59,000
Class W Common Stock [Member]
Subsequent Event [Line Items]
Sale of shares of common stock				67,000
Class W Common Stock [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Sale of shares of common stock		72,000

[1] The variable rate reflected in the table was the rate in effect as of March 31, 2019.