Fair Value Measurements and Financial Instruments - Summary of Fair Value Hierarchy (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Assets:
Available for sale debt securities	$ 13,200	$ 58,200
Equity securities	110,529	186,960
Available for sale debt securities	271,900	693,500
Liabilities:
Cytokinetics Funding Commitments	27,200	12,080
Available for sale debt securities
Assets:
Available for sale debt securities	13,200	58,200
Available for sale debt securities	271,900	693,500
Liabilities:
Cytokinetics Funding Commitments	0	0
Fair Value, Recurring
Assets:
Total current assets	164,283	626,517
Equity securities	110,529	186,960
Cytokinetics R&D Funding Derivative	9,000	12,000
Total non-current assets	396,752	897,783
Liabilities:
Employee EPAs	(467,143)	0
Total non-current liabilities	(494,343)	(12,080)
Fair Value, Recurring \| Royalty Investments
Assets:
Royalty at fair value	5,323	5,323
Fair Value, Recurring \| Cytokinetics Funding Commitment
Liabilities:
Cytokinetics Funding Commitments	(27,200)	(12,080)
Fair Value, Recurring \| Available for sale debt securities
Assets:
Available for sale debt securities	13,200	58,200
Available for sale debt securities	271,900	693,500
Fair Value, Recurring \| Money market funds
Assets:
Money market funds	151,083	568,317
Fair Value, Recurring \| Level 1
Assets:
Total current assets	151,083	568,317
Equity securities	108,288	184,719
Cytokinetics R&D Funding Derivative	0	0
Total non-current assets	108,288	184,719
Liabilities:
Employee EPAs	0	0
Total non-current liabilities	0	0
Fair Value, Recurring \| Level 1 \| Royalty Investments
Assets:
Royalty at fair value	0	0
Fair Value, Recurring \| Level 1 \| Cytokinetics Funding Commitment
Liabilities:
Cytokinetics Funding Commitments	0	0
Fair Value, Recurring \| Level 1 \| Available for sale debt securities
Assets:
Available for sale debt securities	0	0
Available for sale debt securities	0	0
Fair Value, Recurring \| Level 1 \| Money market funds
Assets:
Money market funds	151,083	568,317
Fair Value, Recurring \| Level 2
Assets:
Total current assets	0	0
Equity securities	0	0
Cytokinetics R&D Funding Derivative	0	0
Total non-current assets	0	0
Liabilities:
Employee EPAs	0	0
Total non-current liabilities	0	0
Fair Value, Recurring \| Level 2 \| Royalty Investments
Assets:
Royalty at fair value	0	0
Fair Value, Recurring \| Level 2 \| Cytokinetics Funding Commitment
Liabilities:
Cytokinetics Funding Commitments	0	0
Fair Value, Recurring \| Level 2 \| Available for sale debt securities
Assets:
Available for sale debt securities	0	0
Available for sale debt securities	0	0
Fair Value, Recurring \| Level 2 \| Money market funds
Assets:
Money market funds	0	0
Fair Value, Recurring \| Level 3
Assets:
Total current assets	13,200	58,200
Equity securities	2,241	2,241
Cytokinetics R&D Funding Derivative	9,000	12,000
Total non-current assets	288,464	713,064
Liabilities:
Employee EPAs	(467,143)	0
Total non-current liabilities	(494,343)	(12,080)
Fair Value, Recurring \| Level 3 \| Royalty Investments
Assets:
Royalty at fair value	5,323	5,323
Fair Value, Recurring \| Level 3 \| Cytokinetics Funding Commitment
Liabilities:
Cytokinetics Funding Commitments	(27,200)	(12,080)
Fair Value, Recurring \| Level 3 \| Available for sale debt securities
Assets:
Available for sale debt securities	13,200	58,200
Available for sale debt securities	271,900	693,500
Fair Value, Recurring \| Level 3 \| Money market funds
Assets:
Money market funds	$ 0	$ 0

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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