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STOCKHOLDERS' EQUITY - Public Offering of Common Stock - Additional Information (Details) - USD ($) |  |  | 9 Months Ended
--- | --- | --- | ---
Jul. 05, 2017 | Jun. 17, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Class Of Stock [Line Items] |  |  |  |
Proceeds from sale of common stock in public offering |  |  | $ 44,562,500 | $ 57,499,995
Underwriting discounts and commissions and transaction costs |  |  | $ 2,944,168 | $ 3,832,004
Public Offering |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Shares of common stock issued | 5,750,000 | 6,052,631 |  |
Share price (in dollars per share) | $ 7.75 | $ 9.50 |  |
Proceeds from sale of common stock in public offering | $ 44,600,000 | $ 57,500,000 |  |
Underwriting discounts and commissions and transaction costs | 3,000,000 | 3,800,000 |  |
Net proceeds from issuance of common stock | $ 41,600,000 | $ 53,700,000 |  |
Exercise of Underwriters |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Shares of common stock issued | 750,000 |  |  |

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