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Convertible Notes (Narrative) (Details)
 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
Dec. 31, 2022
USD ($)
$ / shares
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Jan. 01, 2022
USD ($)
Debt instrument                          
Liabilities               $ (233,297,000)   $ (233,297,000) $ (370,250,000)    
Accumulated deficit               (513,256,000)   (513,256,000) (435,227,000)    
Loss on extinguishment of debt                   83,626,000 0 $ 0  
Loss on fair value adjustment of derivatives, net                   10,585,000 0 $ 0  
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   $ 10,381,000 $ 172,500,000    
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% 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   $ 18.93   $ 18.93 $ 18.93 $ 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%              
Repurchased convertible debt, face amount               $ 162,100,000   $ 162,100,000      
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