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Equity - Additional Information (Detail) |  | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 17, 2016 $ / shares shares | Sep. 30, 2016 USD ($) security $ / shares shares | Sep. 30, 2015 USD ($) shares | Dec. 31, 2015 $ / shares shares | Jun. 30, 2016 $ / shares | Aug. 07, 2015 USD ($) | Dec. 31, 2014 shares | Apr. 02, 2014 USD ($)
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  | 18,000,000 |  | 20,000,000 |  |  |  |
Temporary equity, par or stated value per share (in dollars per share) | $ / shares |  | $ 0.001 |  | $ 0.001 |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.001 |  | $ 0.001 |  |  |  |
Common stock, shares issued (in shares) |  | 10,024,875 |  | 9,992,941 |  |  |  |
Common stock, shares outstanding (in shares) |  | 10,024,875 |  | 9,992,941 |  |  |  |
Company's ownership percent |  | 89.20% |  | 100.00% |  |  |  |
OP units held by non-controlling limited partners |  | 1,215,306 | 0 |  |  |  |  |
Proceeds from issuance of preferred stock | $ |  | $ 28,750,000 | $ 0 |  |  |  |  |
At-the-Market Program [Member] |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  | 64,561 |  |  |  |  |  |
Sale of common stock sold under sale agreement |  | 31,934 |  |  |  |  |  |
Average sales price of common stock sold (in dollars per share) | $ / shares |  |  |  |  | $ 11.29 |  |  |
Gross proceeds from issuance of common stock | $ |  | $ 360,472 |  |  |  |  |  |
Net proceeds from issuance of common stock | $ |  | $ 355,057 |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares |  | $ 10.23 |  |  |  |  |  |
Common stock, value, outstanding | $ |  | $ 660,176 |  |  |  |  |  |
Common stock, value, issued | $ |  | $ 650,266 |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Securities allowed for issuance | $ |  |  |  |  |  |  |  | $ 300,000,000
Maximum [Member] | At-the-Market Program [Member] |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, value authorized | $ |  |  |  |  |  | $ 30,000,000.0 |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  | 10,024,875 |  | 9,992,941 |  |  | 7,753,717 |
Maximum Number Of Securities Can Be Sold Under Shelf Registration Statement | security |  | 2 |  |  |  |  |  |
Value of common stock issuable per registration statement | $ |  | $ 23,600,000 |  |  |  |  |  |
Number of shares issued (in shares) |  | 31,934 |  | 2,239,224 |  |  |  |
Common Stock [Member] | Universal Registration Statement [Member] |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  | 2,188,014 |  |  |  |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares issued (in shares) | 1,000,000 | 1,150,000 |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares | $ 25 |  |  |  |  |  |  |

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