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Basis of Presentation - Additional Information (Details)
$ / shares in Units, $ in Millions
 6 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
Jun. 30, 2017
Segment
shares
Dec. 31, 2016
shares
Basis Of Presentation [Line Items]            
Number of operating segments | Segment         1  
Common stock, shares issued | shares   1,352,941     9,544,250 9,275,062
Common stock, offering price per share | $ / shares   $ 17.00        
Underwriting discounts and commissions   $ 1.5        
Offering - related transaction cost   0.8        
Net proceeds on issuance of common stock after deducting underwriting discounts and commissions and estimated offering expenses/offering - related transaction cost   20.7        
Gross proceeds from public offering   $ 23.0        
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       $ 9.5    
Underwriting discounts and commissions       0.8    
Offering - related transaction cost       $ 1.7    
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 $ 0.3   $ 0.1      
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 $ 5.3   $ 1.5      
Gross proceeds from public offering $ 5.6