Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Narrative (Details)

v3.20.4
Share-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Nov. 20, 2020
$ / shares
shares
Oct. 02, 2020
employee
$ / shares
shares
Sep. 04, 2020
employee
$ / shares
shares
May 06, 2019
shares
Apr. 29, 2019
$ / shares
shares
May 02, 2016
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock, issued (shares)             126,725,000 111,798,000 85,500,000
Number of shares available for grant             15,800,000 14,000,000.0  
Common stock, outstanding (shares)             126,725,000 111,798,000 85,500,000
Percentage of outstanding stock             9.40% 5.50%  
Granted inducement (in shares)             925,000 1,600,000  
Granted inducements (in usd per share) | $ / shares             $ 14,360 $ 6.28  
Number of new employees | employee   9 105            
Granted (in shares)             7,568,000 2,520,000 3,003,000
Weighted average price (in usd per share) | $ / shares             $ 5.58 $ 2.56 $ 2.33
Fair value of options vested in period | $             $ 14.9 $ 8.5 $ 10.7
Unrecognized share-based compensation expense | $             $ 51.5    
Equity Incentive Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock, outstanding (shares)             12,000,000.0 6,200,000  
Executive Vice President, General Counsel, Corporate Secretary and Chief Compliance Officer                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Granted inducement (in shares) 298,924                
Granted inducements (in usd per share) | $ / shares $ 13.40                
Executive Vice President, General Counsel, Corporate Secretary and Chief Compliance Officer | Tranche One                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting rights 33.00%                
Executive Vice President, General Counsel, Corporate Secretary and Chief Compliance Officer | Tranche Two                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period 24 months                
New Employees                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Granted inducement (in shares)   96,000 530,000     200,000      
Granted inducements (in usd per share) | $ / shares   $ 14.73 $ 14.83     $ 2,920      
Award vesting period           36 months      
Exercise period           5 years      
Options exercised in period               150,000  
Number of options outstanding             0    
New Employees | Tranche One                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting rights   33.00% 33.00%            
New Employees | Tranche Two                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period   24 months 24 months            
Chief Executive Officer                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Granted inducement (in shares)         1,600,000        
Granted inducements (in usd per share) | $ / shares         $ 6.28        
Exercise period         10 years        
Chief Executive Officer | Tranche One                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period         1 year        
Award vesting rights         25.00%        
Chief Executive Officer | Tranche Two                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period         36 months        
Award vesting rights         75.00%        
Chairman of the Board and Chief Executive Officer                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period       12 months          
Number of options potentially forfeited under accelerated timeline       100,000          
Granted (in shares)       100,000          
Performance Shares | Officer                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Awards granted in period             439,000    
Stock options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Unrecognized share-based compensation expense weighted average recognition period             1 year 4 months 24 days    
Inducement Stock Option                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Exercise period         10 years