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Stock-Based Compensation (Narrative) (Details) - USD ($)
3 Months Ended 10 Months Ended 12 Months Ended
Mar. 10, 2020
Mar. 31, 2020
Oct. 25, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Incremental stock-based compensation expense recorded as a result of modification   $ 400,000        
Granted (in dollars per share)   $ 14.69   $ 7.11    
Weighted average fair value, shares issued (in dollars per share)   $ 7.73   $ 7.63    
2014 Stock Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense     $ 0   $ 0 $ 0
Options exercisable (in shares)     0   0 0
2019 Stock Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock reserved for issuance (in shares)     21,208,755      
Stock option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       4 years    
Expiration period       10 years    
Vesting percentage       25.00%    
Dividend yield   0.00%   0.00%    
Stock option | 2014 Stock Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercise price, hurdle rate       8.00%    
Performance vesting, change in control percentage       50.00%    
Stock option | 2019 Stock Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense   $ 3,100,000   $ 1,900,000    
Vesting period       3 years    
Expiration period       10 years    
Unrecognized stock-based compensation expense   $ 44,100,000   $ 44,800,000    
Unrecognized compensation cost, period for recognition   3 years 7 months 6 days   3 years 9 months 18 days    
Stock option | 2019 Stock Plan | Selling, General and Administrative Expenses            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense   $ 2,064,000   $ 1,200,000    
Stock option | 2019 Stock Plan | Research and Development Expense            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense   1,040,000   700,000    
Restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense   1,300,000   $ 500,000    
Vesting period       4 years    
Unrecognized stock-based compensation expense   $ 30,100,000   $ 12,000,000.0    
Unrecognized compensation cost, period for recognition   3 years 7 months 6 days   3 years 9 months 18 days    
Share price (more than) (in dollars per share) $ 10     $ 10    
Fair value of shares granted   $ 16,900,000   $ 12,800,000    
Restricted stock units | Tranche One            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage       25.00%    
Restricted stock units | Tranche Two            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage       25.00%    
Restricted stock units | Tranche Three            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage       25.00%    
Restricted stock units | Tranche Four            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage       25.00%    
Restricted stock units | Selling, General and Administrative Expenses            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense   800,000   $ 300,000    
Restricted stock units | Research and Development Expense            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense   $ 500,000   $ 200,000