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Debt - Convertible Promissory Note (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
May 16, 2019
Apr. 05, 2019
Apr. 04, 2019
Debt      
Common stock, shares agreed to be sold, stock subscription agreement (in shares) 0.1    
Price per share (in USD per share) $ 12.41    
Increase in additional paid-in capital from conversion $ 0.9 $ 13.0  
Convertible promissory notes      
Debt      
Principal outstanding     $ 0.9
Interest rate (as a percent)     5.00%