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Financial Instrument (Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Assets    
Cash and cash equivalents $ 304,433 $ 460,725
Total investments 529,907 583,675
Short-term restricted cash 300 500
Long-term restricted cash 2,922 4,592
Total assets measured at fair value 837,562 1,049,492
Liabilities    
Fair value of contingent consideration 167,496 169,717
Total liabilities measured at fair value 167,496 169,717
Commercial paper, not included with cash and cash equivalents [Member]    
Assets    
Total investments 57,408 187,632
Corporate debt securities [Member]    
Assets    
Total investments 49,478 8,968
U.S. government & agency securities, not included with cash and cash equivalents [Member]    
Assets    
Total investments 423,021 387,075
Level 1 [Member]    
Assets    
Cash and cash equivalents 63,154 327,315
Short-term restricted cash 300 500
Long-term restricted cash 2,922 4,592
Total assets measured at fair value 66,376 332,407
Level 2 [Member]    
Assets    
Cash and cash equivalents 241,279 133,410
Total investments 529,907 583,675
Total assets measured at fair value 771,186 717,085
Level 2 [Member] | Commercial paper, not included with cash and cash equivalents [Member]    
Assets    
Total investments 57,408 187,632
Level 2 [Member] | Corporate debt securities [Member]    
Assets    
Total investments 49,478 8,968
Level 2 [Member] | U.S. government & agency securities, not included with cash and cash equivalents [Member]    
Assets    
Total investments 423,021 387,075
Level 3 [Member]    
Liabilities    
Fair value of contingent consideration 167,496 169,717
Total liabilities measured at fair value $ 167,496 $ 169,717