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Mandatorily-Redeemable Preferred Stock (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 17, 2016 | Sep. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Proceeds from issuance of mandatorily-redeemable preferred stock |  |  | $ 28,750,000 | $ 0
Proceeds from issuance of equity |  |  | $ 360,472 | 14,895,206
Redemption price of redeemable preferred stock (in dollars per share) |  | $ 25.8 | $ 25.8 |
Offering costs |  |  | $ 241,845 | $ 1,027,986
Term preferred stock, fair value |  | $ 29,700,000 | $ 29,700,000 |
Series A Preferred Stock [Member] |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Number of shares issued (in shares) | 1,000,000 |  | 1,150,000 |
Preferred stock, dividend rate, percentage | 6.375% |  |  |
Preferred stock, par value (in dollars per share) | $ 0.001 |  |  |
Public offering price (in dollars per share) | $ 25 |  |  |
Proceeds from issuance of equity | $ 27,600,000 |  |  |
Redemption price of redeemable preferred stock (in dollars per share) | $ 25 |  |  |
Offering costs | $ 1,200,000 |  |  |
Dividend per Series A Term Preferred Share (in dollars per share) |  | $ 0.190364583 |  |
Series A Preferred Stock [Member] | Over-Allotment Option [Member] |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Number of shares issued (in shares) | 150,000 |  |  |

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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 -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: 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=56944662&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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + 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=6928386&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=6928386&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=6928386&loc=d3e21488-112644 + Details
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- Definition The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: 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=56944662&loc=d3e3255-108585 + Details
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