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Public Offering of Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended
Jun. 30, 2018
Oct. 31, 2019
Oct. 31, 2018
Class of Stock [Line Items]      
Common stock, outstanding (in shares) 17,669,314 17,756,180 17,647,135
Sale of stock, consideration received, gross $ 69,000    
Underwriting discount 4,485    
Other offering expense 418    
Sale of stock, consideration received $ 64,097    
Common Stock      
Class of Stock [Line Items]      
Sale of stock (in shares) 3,136,362    
Sale of stock, price per share (in dollars per share) $ 22.00    
Sale of stock, percentage sold 18.00%