Stockholders' Equity - Summary of Company's Initial Public Offering (Detail)	Jun. 30, 2017 USD ($) shares
Class of Stock [Line Items]
Amount of gross proceeds raised | $	$ 2,513,644
Number of shares issued | shares	237,805
Class T
Class of Stock [Line Items]
Amount of gross proceeds raised | $	$ 62,300
Number of shares issued | shares	7,026
Class W
Class of Stock [Line Items]
Amount of gross proceeds raised | $	$ 0
Number of shares issued | shares	0
Class I
Class of Stock [Line Items]
Amount of gross proceeds raised | $	$ 2,075,944
Number of shares issued | shares	230,779
Notes to Stockholders
Class of Stock [Line Items]
Amount of gross proceeds raised | $	$ 375,400
Primary Offering
Class of Stock [Line Items]
Amount of gross proceeds raised | $	$ 2,000,000
Number of shares issued | shares	221,349
Primary Offering | Class T
Class of Stock [Line Items]
Amount of gross proceeds raised | $	$ 0
Number of shares issued | shares	0
Primary Offering | Class W
Class of Stock [Line Items]
Amount of gross proceeds raised | $	$ 0
Number of shares issued | shares	0
Primary Offering | Class I
Class of Stock [Line Items]
Amount of gross proceeds raised | $	$ 2,000,000
Number of shares issued | shares	221,349
Primary Offering | Notes to Stockholders
Class of Stock [Line Items]
Amount of gross proceeds raised | $	$ 0
DRIP
Class of Stock [Line Items]
Amount of gross proceeds raised | $	$ 13,644
Number of shares issued | shares	1,510
DRIP | Class T
Class of Stock [Line Items]
Amount of gross proceeds raised | $	$ 0
Number of shares issued | shares	0
DRIP | Class W
Class of Stock [Line Items]
Amount of gross proceeds raised | $	$ 0
Number of shares issued | shares	0
DRIP | Class I
Class of Stock [Line Items]
Amount of gross proceeds raised | $	$ 13,644
Number of shares issued | shares	1,510
DRIP | Notes to Stockholders
Class of Stock [Line Items]
Amount of gross proceeds raised | $	$ 0
Private Offering
Class of Stock [Line Items]
Amount of gross proceeds raised | $	$ 500,000
Number of shares issued | shares	14,000
Private Offering | Class T
Class of Stock [Line Items]
Amount of gross proceeds raised | $	$ 62,300
Number of shares issued | shares	7,000
Private Offering | Class W
Class of Stock [Line Items]
Amount of gross proceeds raised | $	$ 0
Number of shares issued | shares	0
Private Offering | Class I
Class of Stock [Line Items]
Amount of gross proceeds raised | $	$ 62,300
Number of shares issued | shares	7,000
Private Offering | Notes to Stockholders
Class of Stock [Line Items]
Amount of gross proceeds raised | $	$ 375,400
Stock dividends
Class of Stock [Line Items]
Number of shares issued | shares	946
Stock dividends | Class T
Class of Stock [Line Items]
Number of shares issued | shares	26
Stock dividends | Class W
Class of Stock [Line Items]
Number of shares issued | shares	0
Stock dividends | Class I
Class of Stock [Line Items]
Number of shares issued | shares	920