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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