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Stock-Based Compensation (Narrative) (Details) - USD ($)
10 Months Ended 12 Months Ended
Oct. 25, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSUs granted to employees (in shares)   1,795,209    
Granted (in dollars per share)   $ 7.11    
Weighted average fair value, shares issued (in dollars per share)   $ 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 percentage   25.00%    
Vesting period   4 years    
Expiration period   10 years    
Dividend yield   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   $ 1,900,000    
Vesting period   3 years    
Expiration period   10 years    
Unrecognized stock-based compensation expense   $ 44,800,000    
Unrecognized compensation cost, period for recognition   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   $ 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   700,000    
Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense   $ 500,000    
Vesting period   4 years    
Unrecognized stock-based compensation expense   $ 12,000,000.0    
Unrecognized compensation cost, period for recognition   3 years 9 months 18 days    
RSUs granted to employees (in shares)   1,795,209    
Share price (more than) (in dollars per share)   $ 10    
Fair value of shares granted   $ 12,800,000    
Granted (in dollars per share)   $ 7.11    
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   $ 300,000    
Restricted stock units | Research and Development Expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense   $ 200,000