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Equity - Additional Information (Details) |  |  |  |  | 5 Months Ended | 9 Months Ended | 15 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2018 USD ($) $ / shares shares | Apr. 04, 2018 USD ($) shares | Mar. 27, 2018 USD ($) $ / shares shares | Apr. 12, 2017 USD ($) security | May 31, 2018 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) shares | Jun. 30, 2018 USD ($) shares | Jan. 10, 2018 shares | Jan. 09, 2018 shares | Dec. 31, 2017 $ / shares shares | Dec. 31, 2016 shares | Aug. 07, 2015 USD ($)
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock authorized and unissued (in shares) |  |  |  |  |  |  |  |  | 6,500,000 |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  |  | 91,500,000 |  |  |  | 98,000,000 | 98,000,000 |  |
Preferred stock, shares authorized (in shares) |  |  |  |  |  | 6,500,000 |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.001 |  |  |  |  |  |  |
Preferred stock, liquidation value | $ |  |  |  |  |  | $ 9,826,000 |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.001 |  |  |  |  | $ 0.001 |  |
Common stock, shares issued (in shares) |  |  |  |  |  | 16,070,616 |  |  |  |  | 13,791,574 |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  | 16,070,616 |  |  |  |  | 13,791,574 |  |
Maximum number of securities that can be sold (in securities) | security |  |  |  | 2 |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred and common equity | $ |  |  |  |  |  | $ 34,397,000 | $ 40,421,000 |  |  |  |  |  |
Average sales price of common stock sold (in dollars per share) | $ / shares |  |  | $ 12.15 |  |  |  |  |  |  |  |  |  |
Discounts and offering expenses | $ |  |  | $ 12,700,000 |  |  | $ 1,894,000 | $ 1,962,000 |  |  |  |  |  |
2017 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred and common equity | $ |  |  |  |  |  |  |  | $ 45,800,000 |  |  |  |  |
Secondary Public Stock Offering |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of stock | $ |  |  | $ 13,400,000 |  |  |  |  |  |  |  |  |  |
Sale of common stock sold under sale agreement (in shares) |  |  | 1,100,000 |  |  |  |  |  |  |  |  |  |
Over-allotment option |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Discounts and offering expenses | $ |  | $ 1,900,000 |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of stock | $ |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |
Sale of common stock sold under sale agreement (in shares) |  | 165,000 |  |  |  |  |  |  |  |  |  |  |
ATM Program |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  | 1,324,867 |  |  |  |  |  |  |
Common stock, value authorized | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,000,000.0
Sale of common stock sold under sale agreement (in shares) |  |  |  |  |  | 716,231 |  |  |  |  |  |  |
Average sales price price (in dollars per share) | $ / shares |  |  |  |  |  | $ 12.83 |  |  |  |  |  |  |
Common stock, value, outstanding | $ |  |  |  |  |  | $ 17,000,000 |  |  |  |  |  |  |
Common stock, value, issued | $ |  |  |  |  |  | 16,700,000 |  |  |  |  |  |  |
At Market Program 2017 Issuances |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Discounts and offering expenses | $ |  |  |  |  |  | 9,100,000 |  |  |  |  |  |  |
Net proceeds from issuance of stock | $ |  |  |  |  |  | $ 9,200,000 |  |  |  |  |  |  |
Average sales price price (in dollars per share) | $ / shares |  |  |  |  |  | $ 12.90 |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  | 16,070,616 | 13,485,025 |  |  |  | 13,791,574 | 10,024,875 |
Common Stock | 2017 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  | 3,675,306 |  |  |  |  |  |  |
Common stock issued (in shares) |  |  |  |  |  |  |  | 544,686 |  |  |  |  |
Securities allowed for issuance (amount up to) | $ |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |
Preferred Stock | 2017 Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  | 20,280 |  |  |  |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  |  | 6,500,000 |  |  |  |  | 0 |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.001 |  |  |  |  | $ 0 |  |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  | 393,048 |  |  |  |  | 0 |  |
Preferred stock, shares issued (in shares) |  |  |  |  |  | 393,048 |  |  |  |  | 0 |  |
Series B Preferred Stock | Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  | 393,048 | 0 |  |  |  | 0 | 0 |
Securities allowed for issuance (amount up to) | $ | $ 150,000,000 |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |
Maximum amount authorized in Primary Offering (in shares) | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate (as percent) | 6.00% |  |  |  |  |  |  |  |  |  |  |  |
Average sales price of common stock sold (in dollars per share) | $ / shares | $ 25 |  |  |  | $ 25 |  |  |  |  |  |  |  |
Proceeds from issuance of preferred stock | $ | $ 131,300,000 |  |  |  |  | $ 9,800,000 |  |  |  |  |  |  |
Discounts and offering expenses | $ |  |  |  |  |  | 576,000 |  |  |  |  |  |  |
Net proceeds from issuance of stock | $ |  |  |  |  |  | $ 8,800,000 |  |  |  |  |  |  |
Sale of common stock sold under sale agreement (in shares) |  |  |  |  | 0 | 393,048 |  |  |  |  |  |  |
OP Unit Holder |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum period required to exercise, in months |  |  |  |  |  | 12 months |  |  |  |  |  |  |

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