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Basis of Presentation - Additional Information (Details) |  |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 14, 2016 USD ($) $ / shares shares | Dec. 08, 2016 USD ($) $ / shares shares | Aug. 29, 2016 USD ($) $ / shares shares | Aug. 17, 2016 USD ($) $ / shares shares | Sep. 30, 2017 Segment shares | Sep. 30, 2016 USD ($) | Dec. 31, 2016 shares
Basis Of Presentation [Line Items] |  |  |  |  |  |  |
Number of operating segments | Segment |  |  |  |  | 1 |  |
Common stock, shares issued | shares |  | 1,352,941 |  |  | 9,577,530 |  | 9,275,062
Common stock, offering price per share | $ / shares |  | $ 17.00 |  |  |  |  |
Net proceeds from initial public offering |  |  |  |  |  | $ 13,600,800 |
Underwriting discounts and commissions |  | $ 1,500,000 |  |  |  |  |
Offering - related transaction cost |  | 800,000 |  |  |  |  |
Net proceeds on issuance of common stock after deducting underwriting discounts and commissions and estimated offering expenses/offering - related transaction cost |  | 20,700,000 |  |  |  |  |
Gross proceeds from public offering |  | $ 23,000,000 |  |  |  |  |
IPO |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |
Common stock, shares issued | shares |  |  |  | 1,500,000 |  |  |
Common stock, offering price per share | $ / shares |  |  |  | $ 8.00 |  |  |
Net proceeds from initial public offering |  |  |  | $ 9,500,000 |  |  |
Underwriting discounts and commissions |  |  |  | 800,000 |  |  |
Offering - related transaction cost |  |  |  | $ 1,700,000 |  |  |
Number of common stock converted from preferred stock | shares |  |  |  | 3,080,733 |  |  |
Common stock dividends, shares | shares |  |  |  | 1,957,207 |  |  |
Number of preferred stock, shares authorized | shares |  |  |  | 10,000,000 |  |  |
Over Allotment Option |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |
Common stock, offering price per share | $ / shares | $ 17.00 |  | $ 8.00 |  |  |  |
Underwriting discounts and commissions | $ 300,000 |  | $ 100,000 |  |  |  |
Common stock, shares issued | shares | 332,941 |  | 200,100 |  |  |  |
Net proceeds on issuance of common stock after deducting underwriting discounts and commissions and estimated offering expenses/offering - related transaction cost | $ 5,300,000 |  | $ 1,500,000 |  |  |  |
Gross proceeds from public offering | $ 5,600,000 |  |  |  |  |  |

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