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Stockholders' Equity - Preferred Stock (Details)
1 Months Ended
Jun. 30, 2017
Vote
$ / shares
shares
Mar. 31, 2019
$ / shares
Dec. 31, 2018
$ / shares
Stockholders' Equity (Deficit)      
Preferred stock, par value (in dollars per share)   $ 0.0001 $ 0.0001
Series A Convertible Preferred Stock      
Stockholders' Equity (Deficit)      
Preferred stock, par value (in dollars per share) $ 0.0001    
Preferred stock conversion ratio | shares 1    
Preferred shares number voting rights | Vote 0