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Subsequent Event - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended
Aug. 01, 2019
Jun. 30, 2019
Dec. 31, 2018
Subsequent Event [Line Items]      
Common stock, shares issued   35,817,393 28,055,344
Common Stock | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Common stock, shares issued 404,000    
Weighted average price per share $ 10.36    
Proceeds from issuance of common stock $ 4.1    
Payments for commissions 3.00%