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Series A Term Preferred Stock (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 27, 2018 | Aug. 31, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Preferred stock par value (in dollars per share) |  |  | $ 0.001 |  | $ 0
Common stock, shares issued (in shares) |  |  | 16,023,872 |  | 13,791,574
Proceeds from issuance of common and preferred equity |  |  | $ 25,113 | $ 20,722 |
Offering costs | $ 12,700 |  | $ 935 | $ 1,225 |
Series A Preferred Stock |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Dividend rate (as percent) |  | 6.375% |  |  |
Preferred stock par value (in dollars per share) |  | $ 0.001 |  |  |
Average sales price price (in dollars per share) |  | $ 25 |  |  |
Proceeds from issuance of common and preferred equity |  | $ 27,600 |  |  |
Redemption price (in dollars per share) |  | $ 25 | $ 25.5 |  |
Offering costs |  | $ 1,200 |  |  |
Fair value of preferred stock |  |  | $ 29,300 |  |
Series A Preferred Stock | Preferred Stock |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Common stock, shares issued (in shares) |  | 1,150,000 |  |  |
Proceeds from issuance of preferred stock |  | $ 28,800 |  |  |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value portion of shares that an entity is required to redeem for cash or other assets at a fixed or determinable date or upon the occurrence of an event. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6939902&loc=d3e21216-110875 + Details
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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21564-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21488-112644 + Details
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- Definition Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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