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Fair Value Measurements and Financial Instruments - Summary of Fair Value Hierarchy (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Assets:
Available for sale debt securities	$ 21,900	$ 18,800
Equity securities	173,270	171,312
Available for sale debt securities	406,800	419,000
Fair Value, Recurring
Assets:
Total current assets	343,003	402,368
Equity securities	173,270	171,312
Total non-current assets	580,070	590,312
Liabilities:
Total non-current liabilities	(11,000)	(9,100)
Fair Value, Recurring | Cytokinetics Funding Commitment
Liabilities:
Cytokinetics Funding Commitments	(11,000)	(9,100)
Fair Value, Recurring | Available for sale debt securities
Assets:
Available for sale debt securities	21,900	18,800
Available for sale debt securities	406,800	419,000
Fair Value, Recurring | Money market funds
Assets:
Money market funds	321,103	383,568
Fair Value, Recurring | Level 1
Assets:
Total current assets	321,103	383,568
Equity securities	173,270	171,312
Total non-current assets	173,270	171,312
Liabilities:
Total non-current liabilities	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	321,103	383,568
Fair Value, Recurring | Level 2
Assets:
Total current assets	0	0
Equity securities	0	0
Total non-current assets	0	0
Liabilities:
Total non-current liabilities	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	21,900	18,800
Equity securities	0	0
Total non-current assets	406,800	419,000
Liabilities:
Total non-current liabilities	(11,000)	(9,100)
Fair Value, Recurring | Level 3 | Cytokinetics Funding Commitment
Liabilities:
Cytokinetics Funding Commitments	(11,000)	(9,100)
Fair Value, Recurring | Level 3 | Available for sale debt securities
Assets:
Available for sale debt securities	21,900	18,800
Available for sale debt securities	406,800	419,000
Fair Value, Recurring | Level 3 | Money market funds
Assets:
Money market funds	$ 0	$ 0

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