Fair Value Measurements and Financial Instruments - Summary of Fair Value Hierarchy (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Assets:
Available for sale debt securities	$ 25,000	$ 18,800
Equity securities	241,918	171,312
Available for sale debt securities	372,100	419,000
Fair Value, Recurring
Assets:
Total current assets	376,107	402,368
Equity securities	241,918	171,312
Total non-current assets	614,018	590,312
Liabilities:
Total non-current liabilities	(18,600)	(9,100)
Fair Value, Recurring \| Cytokinetics Funding Commitment
Liabilities:
Cytokinetics Funding Commitments	(18,600)	(9,100)
Fair Value, Recurring \| Available for sale debt securities
Assets:
Available for sale debt securities	25,000	18,800
Available for sale debt securities	372,100	419,000
Fair Value, Recurring \| Money market funds
Assets:
Money market funds	351,107	383,568
Fair Value, Recurring \| Level 1
Assets:
Total current assets	351,107	383,568
Equity securities	241,918	171,312
Total non-current assets	241,918	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	351,107	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	25,000	18,800
Equity securities	0	0
Total non-current assets	372,100	419,000
Liabilities:
Total non-current liabilities	(18,600)	(9,100)
Fair Value, Recurring \| Level 3 \| Cytokinetics Funding Commitment
Liabilities:
Cytokinetics Funding Commitments	(18,600)	(9,100)
Fair Value, Recurring \| Level 3 \| Available for sale debt securities
Assets:
Available for sale debt securities	25,000	18,800
Available for sale debt securities	372,100	419,000
Fair Value, Recurring \| Level 3 \| Money market funds
Assets:
Money market funds	$ 0	$ 0

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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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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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as noncurrent.

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