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Convertible Notes (Narrative) (Details)
$ / shares in Units, shares in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Aug. 25, 2022
$ / shares
Aug. 11, 2022
USD ($)
Apr. 01, 2022
USD ($)
Mar. 31, 2022
USD ($)
Mar. 02, 2022
USD ($)
Nov. 17, 2017
USD ($)
D
$ / shares
Mar. 29, 2022
$ / shares
Mar. 31, 2023
USD ($)
shares
Sep. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jan. 01, 2022
USD ($)
Debt instrument                            
Liabilities                     $ (220,126,000) $ (233,297,000)    
Accumulated deficit                     (285,534,000) (513,256,000)    
Loss on extinguishment of debt                     0 83,626,000 $ 0  
Loss on fair value adjustment of derivatives, net                     $ 240,000 10,585,000 $ 0  
Common stock                            
Debt instrument                            
Issuance of common stock in connection with the maturity of the convertible senior notes related to the settlement of the in-the-money conversion feature of the convertible senior notes (in shares) | shares                     284      
Convertible senior notes | Debt discount | Cumulative effect, period of adoption, adjustment | Accounting Standards Update 2020-06                            
Debt instrument                            
Additional paid in capital                           $ 35,200,000
Liabilities                           8,300,000
Accumulated deficit                           26,900,000
Convertible senior notes | Debt issuance costs | Cumulative effect, period of adoption, adjustment | Accounting Standards Update 2020-06                            
Debt instrument                            
Additional paid in capital                           700,000
Accumulated deficit                           $ 500,000
1.375% Convertible senior notes due 2023 | Convertible senior notes                            
Debt instrument                            
Face value           $ 172,500,000           $ 10,381,000    
Liability component, principal amount           137,300,000                
Equity component, principal amount           $ 35,200,000                
Debt discount amortization period           5 years                
Convertible notes, stated interest rate (as a percentage)           1.375%         1.375% 1.375% 1.375%  
Debt issuance costs, gross           $ 3,300,000                
Debt issuance cost, convertible, liability component           2,600,000                
Debt issuance cost, convertible, equity component           $ 700,000                
Conversion rate, number of shares to be issued per $1000 of principal (in shares)           52.8318                
Principal amount of notes used as the denominator to determine number of shares converted into notes           $ 1,000                
Initial conversion price of notes (in dollars per share) | $ / shares           $ 18.93                
Debt instrument, convertible, threshold trading days           20                
Debt instrument, convertible, threshold consecutive trading days | D           30                
Debt instrument, convertible, threshold percentage of stock price trigger           130.00%                
Number of consecutive trading days before the five business days during the debt instrument measurement period           5 days                
Denomination of the principal amount of notes used to calculate the percent of trading price during the debt instrument measurement period           $ 1,000                
Maximum conversion price as a percentage of closing stock price           98.00%                
Percentage of face amount of debt instrument redeemable at the company's option           100.00%                
Carrying value               $ 10,400,000       $ 10,378,000    
Issuance of common stock in connection with the maturity of the convertible senior notes related to the settlement of the in-the-money conversion feature of the convertible senior notes (in shares) | shares               300            
Events of default                            
Period of default in payment of interest (in days)           30 days                
Period of default to comply with other agreements (in days)           60 days                
Minimum percentage of aggregate outstanding principal required for default event with other agreements           25.00%                
Minimum principal amount of debt nonpayment required for debt default to occur           $ 40,000,000                
Period of nonpayment of principal amount required for debt default to occur (in days)           30 days                
Minimum percentage of aggregate outstanding principal required for nonpayment of debt default to occur           25.00%                
Minimum percentage of aggregate outstanding principal required for immediate payment declaration to occur           25.00%                
Debt instrument, default percent of principal and accrued and unpaid interest           100.00%                
1.375% Convertible senior notes due 2023 | Convertible senior notes | 2023 Notes Partial Repurchase, first quarter 2022                            
Debt instrument                            
Repayments of convertible debt       $ 174,500,000 $ 199,100,000                  
Repurchased convertible debt, face amount       $ 107,900,000 $ 123,100,000         $ 107,900,000        
Debt, volume-weighted average price | $ / shares             $ 29.6789              
Loss on extinguishment of debt                   66,500,000        
Loss on fair value adjustment of derivatives, net                   $ 8,300,000        
1.375% Convertible senior notes due 2023 | Convertible senior notes | 2023 Notes Partial Repurchase, first quarter 2022 | Remainder of 2023 Notes Partial Repurchase                            
Debt instrument                            
Repayments of convertible debt     $ 24,600,000                      
Repurchased convertible debt, face amount     $ 15,200,000                      
1.375% Convertible senior notes due 2023 | Convertible senior notes | 2023 Notes Partial Repurchase, third quarter 2022                            
Debt instrument                            
Repayments of convertible debt   $ 58,900,000                        
Repurchased convertible debt, face amount   $ 39,000,000                        
Debt, volume-weighted average price | $ / shares $ 27.8456                          
Loss on extinguishment of debt                 $ 17,100,000          
Loss on fair value adjustment of derivatives, net                 $ 2,300,000