Related Party Transactions - Summary of Related Party Costs - Related Party Transactions (Detail) - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Related party costs, Incurred		$ 8,512,507	$ 9,285,362
Related party costs, Paid		4,521,799	9,038,404
Related party costs, Payable		4,237,666	246,958
Operating Expenses Including Organizational Costs [Member]
Related Party Transaction [Line Items]
Related party costs, Incurred		798,899	394,654
Related party costs, Paid		550,938	271,229
Related party costs, Payable		371,386	123,425
Transfer Agent Expenses [Member]
Related Party Transaction [Line Items]
Related party costs, Incurred		107,473
Related party costs, Paid		58,000
Related party costs, Payable		49,473
Asset Management Fees [Member]
Related Party Transaction [Line Items]
Related party costs, Incurred	[1]	1,303,198	135,163
Related party costs, Paid	[1]	262,347	93,492
Related party costs, Payable	[1]	1,082,522	41,671
Property Management Oversight Fees [Member]
Related Party Transaction [Line Items]
Related party costs, Incurred		244,623
Related party costs, Paid		44,336
Related party costs, Payable		200,287
Acquisition Fees [Member]
Related Party Transaction [Line Items]
Related party costs, Incurred		154,311	2,310,020
Related party costs, Paid		154,311	2,310,020
Debt Issuance Costs Capitalized [Member]
Related Party Transaction [Line Items]
Related party costs, Incurred		357,025	499,382
Related party costs, Paid		390,907	465,500
Related party costs, Payable			33,882
Acquisition Expenses Capitalized [Member]
Related Party Transaction [Line Items]
Related party costs, Incurred		3,180,000
Related party costs, Paid		1,200,000
Related party costs, Payable		1,980,000
Additional Paid In Capital Selling Commissions [Member]
Related Party Transaction [Line Items]
Related party costs, Incurred		894,118	3,947,269
Related party costs, Paid		926,278	3,915,109
Related party costs, Payable			32,160
Additional Paid-in Capital Dealer Manager Fees [Member]
Related Party Transaction [Line Items]
Related party costs, Incurred		511,522	1,490,524
Related party costs, Paid		527,342	1,474,704
Related party costs, Payable			15,820
Additional paid in Capital Stockholder Servicing Fees and Dealer Manager Servicing Fees [Member]
Related Party Transaction [Line Items]
Related party costs, Incurred	[2]	47,955
Related party costs, Paid	[2]	1,009
Related party costs, Payable	[2]	46,946
Additional Paid-in Capital Offering Costs [Member]
Related Party Transaction [Line Items]
Related party costs, Incurred		913,383	508,350
Related party costs, Paid		406,331	$ 508,350
Related party costs, Payable		$ 507,052

[1] For the year ended December 31, 2017 and the four months ended April 30, 2018, the Advisor permanently waived one half of the asset management fee totaling approximately $135,000 and $160,000, respectively. Such amounts were waived permanently and accordingly, will not be paid to the Advisor. Commensurate with our Public Offering being declared effective on May 1, 2018, the Advisor is no longer waiving asset management fees

[2] We pay our Dealer Manager an ongoing stockholder servicing fee that is payable monthly and accrues daily in an amount equal to 1/365th of 1% of the purchase price per share of the Class T Shares and an ongoing dealer manager servicing fee that is payable monthly and accrues daily in an amount equal to 1/365th of 0.5% of the purchase price per share of the Class W Shares sold in the Primary Offering