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Convertible Senior Notes - Narrative (Details)
shares in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 31, 2021
USD ($)
Nov. 30, 2020
USD ($)
day
shares
Jun. 30, 2019
USD ($)
day
Feb. 28, 2018
USD ($)
Jun. 30, 2022
USD ($)
note
Jun. 30, 2021
USD ($)
Mar. 31, 2021
day
Sep. 30, 2019
day
Jun. 30, 2018
day
Jun. 30, 2022
USD ($)
note
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
day
Dec. 31, 2020
USD ($)
Nov. 15, 2020
USD ($)
Jun. 01, 2019
USD ($)
Feb. 15, 2018
USD ($)
Debt Instrument [Line Items]                                
Loss on extinguishment of debt         $ 0 $ 1,513,000       $ 0 $ 1,513,000          
Payments for repurchases of convertible notes                   $ 0 $ 63,692,000          
Convertible Senior Notes Due February 2023                                
Debt Instrument [Line Items]                                
Unamortized debt issuance costs                       $ 300,000 $ 2,000,000      
Remaining amortization period for debt issuance costs                   7 months 6 days            
Convertible Notes Due 2025                                
Debt Instrument [Line Items]                                
Remaining amortization period for debt issuance costs                   3 years 4 months 24 days            
Convertible Senior Notes Due June 2026                                
Debt Instrument [Line Items]                                
Remaining amortization period for debt issuance costs                   3 years 10 months 24 days            
Convertible Debt | Convertible Senior Notes Due February 2023                                
Debt Instrument [Line Items]                                
Principal amount       $ 230,000,000 10,900,000         $ 10,900,000           $ 230,000,000
Principal amount exchanged   $ 181,900,000                            
Carrying value $ 10,000,000 42,900,000     10,871,000         10,871,000   10,210,000        
Loss on extinguishment of debt                       1,500,000 $ 8,900,000      
Unamortized debt issuance costs         $ 37,000         $ 37,000   $ 64,000        
Repurchased principal amount 37,100,000                              
Payments for repurchases of convertible notes $ 63,700,000                              
Threshold percentage of stock price trigger                 130.00%     130.00%        
Limitation on sale of common stock, sale price threshold, number of trading days | day                 20     20        
Limitation on sale of common stock, sale price threshold, trading period | day                 30     30        
Number of consecutive business days                 5 days              
Conversion rate of common stock       0.0174292                        
Percentage of closing sale price in excess of convertible notes               98.00%                
Redemption price percentage       100.00%                        
Number of notes converted | note         22         22            
Effective interest rate (in percent)         5.88%         5.88%            
Issuance costs attributable to the liability component       $ 5,300,000                        
Net issuance costs related to the equity component       $ 1,500,000                        
Convertible Debt | Convertible Notes Due 2025                                
Debt Instrument [Line Items]                                
Principal amount   350,000,000                       $ 350,000,000    
Principal amount received   $ 210,700,000                            
Shares issued from exchange on convertible senior notes (in shares) | shares   1.3                            
Carrying value         $ 345,433,000         $ 345,433,000   $ 286,332,000        
Unamortized debt issuance costs         $ 4,567,000         $ 4,567,000   4,232,000        
Principal amount, additional   $ 139,300,000                            
Threshold percentage of stock price trigger   130.00%         130.00%                  
Limitation on sale of common stock, sale price threshold, number of trading days | day   20         20                  
Limitation on sale of common stock, sale price threshold, trading period | day   30         30                  
Number of consecutive business days             5 days                  
Conversion rate of common stock   0.0071355                            
Percentage of closing sale price in excess of convertible notes                 98.00%              
Redemption price percentage   100.00%                            
Effective interest rate (in percent)         5.00%         5.00%            
Issuance costs attributable to the liability component   $ 5,400,000                            
Net issuance costs related to the equity component   $ 1,500,000                            
Convertible Debt | Convertible Senior Notes Due June 2026                                
Debt Instrument [Line Items]                                
Principal amount     $ 316,300,000                       $ 316,250,000  
Carrying value         $ 311,036,000         $ 311,036,000   255,056,000        
Unamortized debt issuance costs         $ 5,214,000         $ 5,214,000   $ 4,276,000        
Threshold percentage of stock price trigger     130.00%         130.00%                
Limitation on sale of common stock, sale price threshold, number of trading days | day     20         20                
Limitation on sale of common stock, sale price threshold, trading period | day     30         30                
Number of consecutive business days               5 days                
Conversion rate of common stock     0.0112851                          
Percentage of closing sale price in excess of convertible notes             98.00%                  
Redemption price percentage     100.00%                          
Effective interest rate (in percent)         5.38%         5.38%            
Issuance costs attributable to the liability component     $ 6,400,000                          
Net issuance costs related to the equity component     $ 2,900,000