v3.22.2.2
Fair value of financial instruments and marketable securities - Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 15, 2022
USD ($)
Aug. 31, 2022
USD ($)
Nov. 30, 2021
USD ($)
Aug. 31, 2021
USD ($)
Feb. 28, 2021
USD ($)
fund
$ / shares
Jan. 31, 2020
USD ($)
$ / shares
May 31, 2019
USD ($)
$ / shares
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Sep. 30, 2019
USD ($)
Aug. 31, 2015
USD ($)
Financial assets and liabilities measured at fair value on recurring basis                            
Write downs of available for sale debt securities               $ 0   $ 0        
Realized gain (loss) from sale of marketable securities               (1,300,000) $ 0.0 (1,600,000) $ 700,000      
Increase in allowance for credit losses               0 0 0 0      
Purchase of equity investments                     100,000      
Unrealized gain (loss) on ClearPoint Equity Investment                   (1,113,000) 2,376,000      
Purchase of convertible note                   40,429,000 276,376,000      
Unrealized gain (loss) on convertible note                   (2,392,000) 2,054,000      
Purchase of marketable securities - equity investments                   22,787,000 205,382,000      
Redemption of marketable securities- equity investments                   104,431,000 740,000      
Transfers of assets measured between Level 1, Level 2, and Level 3               0   0   $ 0    
Operating Expenses               285,314,000 231,819,000 778,457,000 663,077,000      
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Asset               5,300,000 (10,800,000) 32,200,000 (11,600,000)      
3.00% Convertible senior notes due 2022                            
Financial assets and liabilities measured at fair value on recurring basis                            
Interest rate ( as a percent ) 3.00%                          
3.00% Convertible senior notes due 2022 | Convertible debt                            
Financial assets and liabilities measured at fair value on recurring basis                            
Principal               150,000,000   150,000,000   150,000,000   $ 150,000,000.0
Interest rate ( as a percent )                           3.00%
Fair value of convertible notes                       158,300,000    
Repayment of convertible notes including accrued interest $ 152,300,000                          
1.50% Convertible senior notes due 2026 | Convertible debt                            
Financial assets and liabilities measured at fair value on recurring basis                            
Principal               $ 287,500,000   $ 287,500,000   287,500,000 $ 287,500,000  
Interest rate ( as a percent )               1.50%   1.50%     1.50%  
Fair value of convertible notes               $ 337,400,000   $ 337,400,000   305,300,000    
Recurring basis                            
Financial assets and liabilities measured at fair value on recurring basis                            
Fair value of convertible debt               18,579,000   18,579,000   20,971,000    
ClearPoint equity investment                            
Financial assets and liabilities measured at fair value on recurring basis                            
Purchase of equity investments         $ 100,000   $ 4,000,000.0              
Share price (in USD per share) | $ / shares         $ 23.50   $ 3.10              
Unrealized gain (loss) on ClearPoint Equity Investment               (3,500,000) (1,700,000) (1,100,000) 2,400,000      
Marketable securities - equity investments               13,400,000   13,400,000   14,500,000    
ClearPoint convertible debt                            
Financial assets and liabilities measured at fair value on recurring basis                            
Purchase of convertible debt investment           $ 10,000,000.0                
Conversion price - convertible note | $ / shares           $ 6.00                
Term of convertible note           5 years                
Unrealized gain (loss) on convertible note               (4,400,000) (2,300,000) (2,400,000) 2,100,000      
Fair value of convertible debt               18,600,000   18,600,000   $ 21,000,000.0    
Mutual Funds                            
Financial assets and liabilities measured at fair value on recurring basis                            
Purchase of marketable securities - equity investments   $ 22,800,000 $ 4,600,000 $ 5,400,000 $ 200,000,000.0                  
Number of mutual funds invested in | fund         2                  
Redemption of marketable securities- equity investments               100,800,000 700,000 104,400,000 700,000      
Unrealized gain on marketable securities - equity investments               100,000 700,000   1,400,000      
Unrealized loss on marketable securities - equity investments                   11,300,000        
Unrealized foreign currency transaction gain (loss), net               $ (1,400,000) $ (200,000) $ (1,000,000.0) $ (200,000)