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Initial Public Offering of Common Stock (Details) - USD ($)
$ in Thousands
12 Months Ended
Nov. 02, 2017
Oct. 26, 2017
Dec. 31, 2017
Initial Public Offering of Common Stock      
Gross proceeds from offering $ 115,000    
Proceeds from common stock offerings, net 106,200   $ 106,245
Offering costs $ 8,800    
IPO      
Initial Public Offering of Common Stock      
Shares issued (in shares)   6,250,000  
Over-Allotment Option      
Initial Public Offering of Common Stock      
Shares issued (in shares) 937,500