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Change in Capital Structure (Details)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 24, 2018
USD ($)
Sep. 20, 2018
USD ($)
$ / shares
shares
Jul. 06, 2018
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
Dec. 31, 2018
$ / shares
shares
Jun. 26, 2018
$ / shares
shares
Change in Capital Structure [Abstract]              
Common stock, shares authorized (in shares) | shares       50,000,000   50,000,000 50,000,000
Common stock, par value (in dollars per share) | $ / shares       $ 0.01   $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) | shares       1,000,000   1,000,000 1,000,000
Preferred stock, par value (in dollars per share) | $ / shares       $ 0.01   $ 0.01 $ 0.01
Stock split ratio     24        
Deferred income tax benefit | $ $ (863)     $ 176 $ (731)    
Initial Public Offering [Member]              
Change in Capital Structure [Abstract]              
Sold and issued shares of common stock (in shares) | shares   2,900,000          
Common stock price per share (in dollars per share) | $ / shares   $ 19          
Net proceeds from initial public offering | $   $ 50,100          
Non-voting Common Stock [Member]              
Change in Capital Structure [Abstract]              
Common stock, shares authorized (in shares) | shares       20,000,000   20,000,000 20,000,000
Common stock, par value (in dollars per share) | $ / shares       $ 0.01   $ 0.01 $ 0.01