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Debt (Details) - Convertible Debt
 3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
day
Mar. 31, 2022
day
Dec. 31, 2021
USD ($)
day
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
Rate
Jun. 30, 2022
Jun. 30, 2022
$ / shares
Jan. 11, 2021
USD ($)
Rate
May 04, 2020
USD ($)
Rate
0.25% Convertible Senior Notes                      
Line of Credit Facility [Line Items]                      
Debt instrument, face amount                   $ 345,000,000  
Stated interest rate (as a percent) | Rate             0.25%     0.25%  
Convertible Notes, conversion price (in dollars per share) | $ / shares                 $ 8.15    
Interest expense, contractual coupon interest $ 200,000     $ 200,000 $ 400,000 $ 400,000          
Interest expense, accretion of debt discount 400,000     300,000 700,000 700,000          
Interest expense, amortization of debt issuance costs 8,400     8,400 $ 16,800 15,100          
Effective interest rate on Convertible Notes (as a percent)         0.70%            
0.25% Convertible Senior Notes | Level 2                      
Line of Credit Facility [Line Items]                      
Estimated fair value of debt 213,900,000   $ 297,600,000   $ 213,900,000            
1.25% Convertible Senior Notes                      
Line of Credit Facility [Line Items]                      
Debt instrument, face amount                     $ 201,300,000
Stated interest rate (as a percent)             1.25% 1.25%     1.25%
Convertible Notes, conversion price (in dollars per share) | $ / shares                 $ 8.15    
Interest expense, contractual coupon interest 600,000     700,000 1,200,000 1,300,000          
Interest expense, accretion of debt discount 300,000     300,000 600,000 600,000          
Interest expense, amortization of debt issuance costs 37,000     $ 30,000 $ 74,000 $ 70,000          
Effective interest rate on Convertible Notes (as a percent)         1.96%            
1.25% Convertible Senior Notes | Level 2                      
Line of Credit Facility [Line Items]                      
Estimated fair value of debt $ 168,600,000   $ 238,900,000   $ 168,600,000            
1.25% Convertible Senior Notes | Debt Instrument, Redemption, Period One                      
Line of Credit Facility [Line Items]                      
Conversion price on applicable trading day (as a percent) 130.00% 130.00% 130.00%                
Threshold trading days (in days) | day 20 20 20                
Consecutive trading days (in days) | day 30 30 30