Fair Value Measurements and Financial Instruments - Summary of Fair Value Hierarchy (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2024	Dec. 31, 2023
Assets:
Available for sale debt securities	$ 29,000	$ 18,300
Equity securities	277,217	199,487
Available for sale debt securities	473,700	437,100
Liabilities:
Available for sale debt securities, liabilities noncurrent	$ 3,220	$ 900
Fair value asset liability recurring basis still held unrealized gain loss statement of income extensible list not disclosed flag	fair value	fair value
Debt Securities
Assets:
Available for sale debt securities	$ 29,000	$ 18,300
Available for sale debt securities	473,700	437,100
Liabilities:
Available for sale debt securities, liabilities noncurrent	0	0
Fair Value, Recurring
Assets:
Total current assets	610,666	175,720
Equity securities	277,217	199,487
Total non-current assets	750,917	638,365
Liabilities:
Available for sale debt securities, liabilities noncurrent	(3,220)	(900)
Fair Value, Recurring \| Royalty Investments
Assets:
Available for sale debt securities	0	1,778
Fair Value, Recurring \| Cytokinetics Funding Commitment
Liabilities:
Available for sale debt securities, liabilities current	(3,220)	(900)
Fair Value, Recurring \| Debt Securities
Assets:
Available for sale debt securities	29,000	18,300
Available for sale debt securities	473,700	437,100
Level 1 \| Fair Value, Recurring
Assets:
Total current assets	581,666	157,420
Equity securities	277,217	199,190
Total non-current assets	277,217	199,190
Liabilities:
Available for sale debt securities, liabilities noncurrent	0	0
Level 1 \| Fair Value, Recurring \| Royalty Investments
Assets:
Available for sale debt securities	0	0
Level 1 \| Fair Value, Recurring \| Cytokinetics Funding Commitment
Liabilities:
Available for sale debt securities, liabilities current	0	0
Level 1 \| Fair Value, Recurring \| Debt Securities
Assets:
Available for sale debt securities	0	0
Available for sale debt securities	0	0
Level 2 \| Fair Value, Recurring
Assets:
Total current assets	0	0
Equity securities	0	0
Total non-current assets	0	0
Liabilities:
Available for sale debt securities, liabilities noncurrent	0	0
Level 2 \| Fair Value, Recurring \| Royalty Investments
Assets:
Available for sale debt securities	0	0
Level 2 \| Fair Value, Recurring \| Cytokinetics Funding Commitment
Liabilities:
Available for sale debt securities, liabilities current	0	0
Level 2 \| Fair Value, Recurring \| Debt Securities
Assets:
Available for sale debt securities	0	0
Available for sale debt securities	0	0
Level 3 \| Fair Value, Recurring
Assets:
Total current assets	29,000	18,300
Equity securities	0	297
Total non-current assets	473,700	439,175
Liabilities:
Available for sale debt securities, liabilities noncurrent	(3,220)	(900)
Level 3 \| Fair Value, Recurring \| Royalty Investments
Assets:
Available for sale debt securities	0	1,778
Level 3 \| Fair Value, Recurring \| Cytokinetics Funding Commitment
Liabilities:
Available for sale debt securities, liabilities current	(3,220)	(900)
Level 3 \| Fair Value, Recurring \| Debt Securities
Assets:
Available for sale debt securities	29,000	18,300
Available for sale debt securities	473,700	437,100
Money market funds \| Fair Value, Recurring
Assets:
Money market funds	581,666	157,420
Money market funds \| Level 1 \| Fair Value, Recurring
Assets:
Money market funds	581,666	157,420
Money market funds \| Level 2 \| Fair Value, Recurring
Assets:
Money market funds	0	0
Money market funds \| Level 3 \| Fair Value, Recurring
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 noncurrent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481830/320-10-45-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(12))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482736/825-10-45-1A

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