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Common Stock and Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 7 Months Ended
May 29, 2019
Jul. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jul. 31, 2019
Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items]                
Sale of common shares (in shares)     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    
Convertible preferred stock converted into shares       15,109,950        
Increase in common stock authorized (in shares) 90,000,000              
Common stock, shares authorized 150,000,000   150,000,000   150,000,000     150,000,000
Preferred stock, shares authorized 10,000,000   10,000,000   10,000,000     10,000,000
Preferred stock, par value $ 0.001   $ 0.001   $ 0.001     $ 0.001
Preferred stock, shares issued     0   0     0
Preferred stock, shares outstanding     0   0     0
Subsequent event                
Subsidiary, Sale of Stock [Line Items]                
Sale of common shares (in shares)             3,450,000  
Proceeds from sale of common stock             $ 48,300  
Over-Allotment Option                
Subsidiary, Sale of Stock [Line Items]                
Shares Option Exercise Period     30 days          
Over-Allotment Option | Subsequent event                
Subsidiary, Sale of Stock [Line Items]                
Sale of common shares (in shares)   450,000            
Purchase price (in dollars per share)   $ 15.00         $ 15.00  
Proceeds from sale of common stock   $ 6,300