Fair Value Measurements and Financial Instruments - Summary of Fair Value Hierarchy (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Assets:
Available for sale debt securities	$ 18,800	$ 58,200
Equity securities	171,312	186,960
Available for sale debt securities	419,000	693,500
Liabilities:
Cytokinetics Funding Commitments	$ (9,100)	$ (12,080)
Fair Value Asset Liability Recurring Basis Still Held Unrealized Gain Loss Statement Of Income Extensible List Not Disclosed Flag	fair value	fair value
Fair Value, Recurring
Assets:
Total current assets	$ 402,368	$ 626,517
Equity securities	171,312	186,960
Cytokinetics R&D Funding Derivative	0	12,000
Total non-current assets	590,312	897,783
Liabilities:
Total non-current liabilities	$ (9,100)	$ (12,080)
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Royalty Investments \| Fair Value, Recurring
Assets:
Royalty at fair value	$ 0	$ 5,323
Cytokinetics Funding Commitment \| Fair Value, Recurring
Liabilities:
Cytokinetics Funding Commitments	(9,100)	(12,080)
Available for sale debt securities
Assets:
Available for sale debt securities	18,800	58,200
Available for sale debt securities	419,000	693,500
Liabilities:
Cytokinetics Funding Commitments	0	0
Available for sale debt securities \| Fair Value, Recurring
Assets:
Available for sale debt securities	18,800	58,200
Available for sale debt securities	419,000	693,500
Money market funds \| Fair Value, Recurring
Assets:
Money market funds	383,568	568,317
Level 1 \| Fair Value, Recurring
Assets:
Total current assets	383,568	568,317
Equity securities	171,312	184,719
Cytokinetics R&D Funding Derivative	0	0
Total non-current assets	171,312	184,719
Liabilities:
Total non-current liabilities	0	0
Level 1 \| Royalty Investments \| Fair Value, Recurring
Assets:
Royalty at fair value	0	0
Level 1 \| Cytokinetics Funding Commitment \| Fair Value, Recurring
Liabilities:
Cytokinetics Funding Commitments	0	0
Level 1 \| Available for sale debt securities \| Fair Value, Recurring
Assets:
Available for sale debt securities	0	0
Available for sale debt securities	0	0
Level 1 \| Money market funds \| Fair Value, Recurring
Assets:
Money market funds	383,568	568,317
Level 2 \| Fair Value, Recurring
Assets:
Total current assets	0	0
Equity securities	0	0
Cytokinetics R&D Funding Derivative	0	0
Total non-current assets	0	0
Liabilities:
Total non-current liabilities	0	0
Level 2 \| Royalty Investments \| Fair Value, Recurring
Assets:
Royalty at fair value	0	0
Level 2 \| Cytokinetics Funding Commitment \| Fair Value, Recurring
Liabilities:
Cytokinetics Funding Commitments	0	0
Level 2 \| Available for sale debt securities \| Fair Value, Recurring
Assets:
Available for sale debt securities	0	0
Available for sale debt securities	0	0
Level 2 \| Money market funds \| Fair Value, Recurring
Assets:
Money market funds	0	0
Level 3 \| Fair Value, Recurring
Assets:
Total current assets	18,800	58,200
Equity securities	0	2,241
Cytokinetics R&D Funding Derivative	0	12,000
Total non-current assets	419,000	713,064
Liabilities:
Total non-current liabilities	(9,100)	(12,080)
Level 3 \| Royalty Investments \| Fair Value, Recurring
Assets:
Royalty at fair value	0	5,323
Level 3 \| Cytokinetics Funding Commitment \| Fair Value, Recurring
Liabilities:
Cytokinetics Funding Commitments	(9,100)	(12,080)
Level 3 \| Available for sale debt securities \| Fair Value, Recurring
Assets:
Available for sale debt securities	18,800	58,200
Available for sale debt securities	419,000	693,500
Level 3 \| Money market funds \| Fair Value, Recurring
Assets:
Money market funds	$ 0	$ 0

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