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Debt - Convertible Notes Other Information (Details) - USD ($)
$ / shares in Units, $ in Millions
May 16, 2019
Apr. 05, 2019
Dec. 31, 2019
Apr. 04, 2019
Dec. 31, 2018
Debt          
Common stock, shares agreed to be sold, stock subscription agreement (in shares)   100,000      
Common stock, value, subscriptions   $ 1.0      
Price per share (in USD per share)   $ 12.41      
Common stock, shares issued (in shares)     52,746,728   4,960,552
Increase in additional paid-in capital from conversion $ 0.9 $ 13.0      
Convertible promissory notes          
Debt          
Note Principal Amount       $ 0.9  
Interest rate (as a percent)       5.00%  
January 2019 and February 2019 notes | Convertible notes          
Debt          
Conversion price discount per original agreement (as a percent)     15.00%    
November 2018 and December 2018 notes | Convertible notes | Minimum          
Debt          
Conversion price discount per original agreement (as a percent)     0.00%    
Convertible notes          
Debt          
Common stock, shares issued (in shares)   1,100,000      
Extinguishment of debt loss   $ 0.3      
Shares issued, price per share (in USD per share)   $ 8.69      
Board members          
Debt          
Common stock, shares agreed to be sold, stock subscription agreement (in shares)   40,286      
Common stock, value, subscriptions   $ 0.5