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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Apr. 22, 2020
Mar. 31, 2020
Apr. 30, 2020
Dec. 31, 2019
Apr. 05, 2019
Subsequent Events          
Price per share (in USD per share)         $ 12.41
2019 Plan          
Subsequent Events          
Granted (in shares)   1,766,381      
Beginning balance, weighted average exercise price (in dollars per share)   $ 1.70   $ 4.59  
Options outstanding, beginning balance (in shares)   2,496,771   731,189  
Subsequent events          
Subsequent Events          
Number of common shares in to which the warrants are exercisable (in shares) 48,100,000        
Initial exercise price (in USD per share) $ 0.395        
Common stock issued upon conversion (in shares) 21,900,000        
Subsequent events | Private placement          
Subsequent Events          
Price per share (in USD per share) $ 0.395        
Subsequent events | April 2020 notes          
Subsequent Events          
Notes Issued $ 5.6        
Percentage of principal amount required to be redeemed, if company financing transaction generates cash in year one (in percentage) 20.00%        
Percentage of principal amount required to be redeemed, if company financing transaction generates cash in year two (in percentage) 30.00%        
Subsequent events | Paycheck protection program loan          
Subsequent Events          
Note Principal Amount     $ 0.4    
Interest rate (in percentage)     1.00%