Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity - Narrative (Details)

v3.22.4
Shareholders' Equity - Narrative (Details) - USD ($)
 1 Months Ended 12 Months Ended
Nov. 19, 2021
Jul. 27, 2020
Dec. 28, 2016
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Class of Stock [Line Items]                
Common stock, outstanding (in shares)       141,600,000 142,268,000 141,600,000 126,700,000  
Common stock, issued (in shares)       141,600,000 142,268,000 141,600,000 126,700,000  
Proceeds from exercise of warrants         $ 0 $ 365,000 $ 1,000  
Warrants exercised during period (in shares)           1,700,000 500  
Warrants                
Class of Stock [Line Items]                
Warrants exercised during period (in shares)           1,684,000    
Number of warrants outstanding (in shares)       0   0 1,690,000  
Warrants expired (in shares)           6,000    
Common Shares                
Class of Stock [Line Items]                
Common stock, outstanding (in shares)       141,600,000 142,268,000 141,600,000 126,725,000 111,798,000
November 2021 Open Market Sale Agreement                
Class of Stock [Line Items]                
Aggregate offering price $ 250,000,000              
Number of shares issued 10,200,000              
Weighted average price per share (in usd per share) $ 19.90              
Proceeds from offering       $ 202,400,000        
Share issuance costs $ 5,600,000              
Underwriting commissions percentage 3.00%              
Underwriting commissions $ 5,300,000              
Professional fees $ 300,000              
July 2020 Public Offering                
Class of Stock [Line Items]                
Number of shares issued   13,300,000            
Proceeds from offering   $ 200,000,000            
Share issuance costs   $ 12,300,000            
Underwriting commissions percentage   6.00%            
Underwriting commissions   $ 12,000,000            
Professional fees   $ 300,000            
Share price (in usd per share)   $ 15.00            
2016 Bought Deal Public Offering                
Class of Stock [Line Items]                
Number of shares issued     12,800,000          
Subscription price per unit (in usd per share)     $ 2.25          
Exercise price of warrants (in usd per share)     $ 3.00 $ 3.00   $ 3.00 $ 3.00 $ 3.00
Proceeds from exercise of warrants           $ 300,000 $ 2,000 $ 5,500,000
Warrants expired (in shares)           6,000    
2016 Bought Deal Public Offering | Warrants                
Class of Stock [Line Items]                
Proceeds from offering     $ 28,800,000          
Share issuance costs     $ 655,000          
Warrant exercise period     5 years          
Fair value of warrants     $ 7,200,000          
Number of warrants outstanding (in shares)         1,600,000      
2016 Bought Deal Public Offering | Warrants | 2014 Warrant                
Class of Stock [Line Items]                
Number of shares called by each warrant (in shares)     0.50          
2016 Bought Deal Public Offering | Common Shares                
Class of Stock [Line Items]                
Number of shares called by each warrant (in shares)     1          
Number of shares converted (in shares)           1,300,000