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Stockholders' Equity - Additional Information (Detail) - USD ($) |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 16, 2015 | Dec. 11, 2015 | Jun. 15, 2015 | Jun. 10, 2015 | May. 15, 2015 | May. 13, 2015 | Oct. 29, 2014 | Oct. 24, 2014 | Sep. 29, 2014 | Sep. 25, 2014 | Mar. 31, 2014 | Jan. 29, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Aug. 07, 2015 | Apr. 02, 2014
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  |  |  |  |  |  |  | 3,780,264 |  |  |  |  |
Distributions paid |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,059,179 | $ 2,458,802 | $ 9,730,093 |  |
Accumulated earnings and profits |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,600,000 |  |
Common stock, shares issued |  |  |  |  |  |  |  |  |  |  |  |  | 9,992,941 | 7,753,717 |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities allowed for issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  |  |  |  |  |  |  |  | 2,239,224 | 1,223,453 | 3,780,264 |  |
Value of common stock issuable per registration statement |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,300,000 |  |  |  |
2014 Equity Issuances [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  |  |  |  |  | 1,150,000 |  |  |  |  |  |  |
Price per share |  |  |  |  |  |  |  |  |  | $ 12.28 |  |  |  |  |  |  |
Gross proceeds from issuance of common stock |  |  |  |  |  |  |  |  | $ 14,100,000 |  |  |  |  |  |  |  |
Net proceeds after deducting offering expenses |  |  |  |  |  |  |  |  | $ 13,200,000 |  |  |  |  |  |  |  |
2015 Equity Issuances [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  | 900,000 |  |  |  | 1,250,000 |  |  |  |  |  |  |  |  |  |  |
Price per share |  | $ 8.82 |  |  |  | $ 11.40 |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock | $ 7,900,000 |  |  |  | $ 14,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds after deducting offering expenses | $ 7,400,000 |  |  |  | $ 13,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Over-Allotment Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock |  |  | $ 645,000 |  |  |  | $ 902,000 |  |  |  |  |  |  |  |  |  |
Net proceeds after deducting offering expenses |  |  | $ 606,000 |  |  |  | $ 838,000 |  |  |  |  |  |  |  |  |  |
Additional common stock shares issued |  |  |  | 56,597 |  |  |  | 73,453 |  |  |  |  |  |  |  |  |
IPO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  |  |  |  |  |  |  | 3,333,334 |  |  |  |  |
Price per share |  |  |  |  |  |  |  |  |  |  |  | $ 15.00 |  |  |  |  |
Gross proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  |  | $ 56,700,000 |  |  |  |  |
Net proceeds after deducting offering expenses |  |  |  |  |  |  |  |  |  |  |  | $ 51,300,000 | $ 51,300,000 |  |  |  |
Invested in new property acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 37,900,000 |  |
Expended or accrued for capital improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,700,000 |  |
Distributions paid |  |  |  |  |  |  |  |  |  |  | $ 10,300,000 |  |  |  |  |  |
Universal Registration Statement [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  |  |  |  |  |  |  |  | 2,156,080 |  |  |  |
At-the-Market Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000 |  |  |  |
Sale of common stock sold under sale agreement |  |  |  |  |  |  |  |  |  |  |  |  | 32,627 |  |  |  |
Average sales price of common stock sold |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.19 |  |  |  |
Net proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 295,000 |  |  |  |
At-the-Market Program [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, value authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,000,000 |

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