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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 7 Months Ended
Jul. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jul. 31, 2019
Subsequent Events            
Common stock through an underwritten public offering   3,000,000 6,164,000      
Purchase price (in dollars per share)   $ 15.00 $ 14.00 $ 15.00 $ 14.00  
Proceeds from sale of common stock   $ 42,000 $ 77,800 $ 42,220 $ 79,137  
Subsequent event            
Subsequent Events            
Common stock through an underwritten public offering           3,450,000
Proceeds from sale of common stock           $ 48,300
Subsequent event | Over-Allotment Option            
Subsequent Events            
Common stock through an underwritten public offering 450,000          
Purchase price (in dollars per share) $ 15.00         $ 15.00
Proceeds from sale of common stock $ 6,300