v3.26.1
Fair Value Measurements - Schedule of Assets and Liabilities are Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Mar. 31, 2025
Assets:    
Debt securities, available-for-sale $ 2,872,601 $ 2,171,480
Investment 407,985 302,939
Total assets at fair value 4,655,292 2,924,396
Liabilities:    
Liability instruments measured at fair value 0 9,981
Total liabilities at fair value 0 9,981
Earn-Out Shares    
Liabilities:    
Liabilities at fair value   10,000
Investment in Arbutus common shares    
Assets:    
Investment 174,800 135,600
Common Shares | Investment in Datavant Class A units    
Assets:    
Investment 233,171 167,361
Common Shares | Investment in Arbutus common shares    
Assets:    
Investment 174,814 135,578
Corporate bonds    
Assets:    
Debt securities, available-for-sale 748,422 0
U.S. Treasury securities    
Assets:    
Debt securities, available-for-sale 2,124,179 0
Money market funds    
Assets:    
Money market funds 1,374,706 2,621,457
Level 1    
Assets:    
Total assets at fair value 1,549,520 2,757,035
Liabilities:    
Liability instruments measured at fair value 0 0
Total liabilities at fair value 0 0
Level 1 | Common Shares | Investment in Datavant Class A units    
Assets:    
Investment 0 0
Level 1 | Common Shares | Investment in Arbutus common shares    
Assets:    
Investment 174,814 135,578
Level 1 | Corporate bonds    
Assets:    
Debt securities, available-for-sale 0 0
Level 1 | U.S. Treasury securities    
Assets:    
Debt securities, available-for-sale 0 0
Level 1 | Money market funds    
Assets:    
Money market funds 1,374,706 2,621,457
Level 2    
Assets:    
Total assets at fair value 2,872,601 0
Liabilities:    
Liability instruments measured at fair value 0 0
Total liabilities at fair value 0 0
Level 2 | Common Shares | Investment in Datavant Class A units    
Assets:    
Investment 0 0
Level 2 | Common Shares | Investment in Arbutus common shares    
Assets:    
Investment 0 0
Level 2 | Corporate bonds    
Assets:    
Debt securities, available-for-sale 748,422 0
Level 2 | U.S. Treasury securities    
Assets:    
Debt securities, available-for-sale 2,124,179 0
Level 2 | Money market funds    
Assets:    
Money market funds 0 0
Level 3    
Assets:    
Total assets at fair value 233,171 167,361
Liabilities:    
Liability instruments measured at fair value 0 9,981
Total liabilities at fair value 0 $ 9,981
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Liability Instruments Measured at Fair Value
Level 3 | Earn-Out Shares    
Liabilities:    
Liabilities at fair value   $ 10,000
Level 3 | Common Shares | Investment in Datavant Class A units    
Assets:    
Investment 233,171 167,361
Level 3 | Common Shares | Investment in Arbutus common shares    
Assets:    
Investment 0 0
Level 3 | Corporate bonds    
Assets:    
Debt securities, available-for-sale 0 0
Level 3 | U.S. Treasury securities    
Assets:    
Debt securities, available-for-sale 0 0
Level 3 | Money market funds    
Assets:    
Money market funds $ 0 $ 0