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Preferred Stock and Common Stock - Additional Information (Details) - shares
Sep. 30, 2019
Dec. 31, 2018
Temporary Equity Disclosure [Abstract]    
Preferred stock, shares authorized 10,000,000  
Common stock, shares authorized 150,000,000 150,000,000
Preferred stock, shares issued 0  
Preferred stock, shares outstanding 0  
Common stock, shares issued 36,443,631 28,055,344
Common stock, shares outstanding 36,443,631 28,055,344