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Summary of Significant Accounting Policies (Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Assets    
Total cash and cash equivalents $ 425,388 $ 81,611
Total investments 654,502 237,203
Short-term restricted cash: Cash 500 836
Long-term restricted cash: Cash 4,560 3,500
Total assets measured at fair value 1,084,950 323,150
Liabilities    
Continuation Advances
Fair value of contingent consideration 168,574  
Total liabilities measured at fair value 168,574
Cash and money market funds [Member]    
Assets    
Total cash and cash equivalents 364,020 43,040
Commercial paper [Member]    
Assets    
Total cash and cash equivalents 61,368 32,537
U.S. government and agency securities [Member]    
Assets    
Total cash and cash equivalents   170
Total investments 385,090 107,103
U.S. Treasury security [Member]    
Assets    
Total cash and cash equivalents   5,864
Commercial paper, not included with cash and cash equivalents [Member]    
Assets    
Total investments 255,817 112,644
Corporate debt securities [Member]    
Assets    
Total investments 13,595 17,456
Level 1 [Member]    
Assets    
Total cash and cash equivalents 364,020 43,040
Short-term restricted cash: Cash 500 836
Long-term restricted cash: Cash 4,560 3,500
Total assets measured at fair value 369,080 47,376
Liabilities    
Continuation Advances
Total liabilities measured at fair value
Level 1 [Member] | Cash and money market funds [Member]    
Assets    
Total cash and cash equivalents 364,020 43,040
Level 2 [Member]    
Assets    
Total cash and cash equivalents 61,368 38,571
Total investments 654,502 237,203
Total assets measured at fair value 715,870 275,774
Liabilities    
Continuation Advances
Total liabilities measured at fair value
Level 2 [Member] | Commercial paper [Member]    
Assets    
Total cash and cash equivalents 61,368 32,537
Level 2 [Member] | U.S. government and agency securities [Member]    
Assets    
Total cash and cash equivalents   170
Total investments 385,090 107,103
Level 2 [Member] | U.S. Treasury security [Member]    
Assets    
Total cash and cash equivalents   5,864
Level 2 [Member] | Commercial paper, not included with cash and cash equivalents [Member]    
Assets    
Total investments 255,817 112,644
Level 2 [Member] | Corporate debt securities [Member]    
Assets    
Total investments 13,595 17,456
Level 3 [Member]    
Liabilities    
Continuation Advances
Fair value of contingent consideration 168,574  
Total liabilities measured at fair value $ 168,574