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Fair Value of Financial Instruments | 6 Months Ended
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Jun. 30, 2024
Fair Value Disclosures [Abstract] |
Fair Value of Financial Instruments | 4. Fair Value of Financial Instruments The following tables summarize the Company’s financial assets and liabilities that are measured at fair value on a recurring basis (in thousands):
|  | June 30, 2024 |
|  | Level 1 |  |  | Level 2 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 273,038 |  |  | $ | - |  |  | $ | 273,038 |
Commercial paper |  |  | - |  |  |  | 8,439 |  |  |  | 8,439 |
U.S. treasury securities |  |  | - |  |  |  | 1,994 |  |  |  | 1,994 |
Marketable securities: |  |  |  |  |  |  |  |  |
U.S. treasury securities |  |  | - |  |  |  | 741,607 |  |  |  | 741,607 |
Corporate notes and bonds |  |  | - |  |  |  | 450,961 |  |  |  | 450,961 |
U.S. agency obligations |  |  | - |  |  |  | 345,315 |  |  |  | 345,315 |
Commercial paper |  |  | - |  |  |  | 81,970 |  |  |  | 81,970 |
Derivative instruments: |  |  |  |  |  |  |  |  |
Foreign currency forward contracts |  |  | - |  |  |  | 1,659 |  |  |  | 1,659 |
Total assets |  | $ | 273,038 |  |  | $ | 1,631,945 |  |  | $ | 1,904,983 |
Liabilities: |  |  |  |  |  |  |  |  |
Derivative instruments: |  |  |  |  |  |  |  |  |
Foreign currency forward contracts |  | $ | - |  |  | $ | 842 |  |  | $ | 842 |
Total liabilities |  | $ | - |  |  | $ | 842 |  |  | $ | 842 |
|  | December 31, 2023 |
|  | Level 1 |  |  | Level 2 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 264,923 |  |  | $ | - |  |  | $ | 264,923 |
U.S. treasury securities |  |  | - |  |  |  | 52,130 |  |  |  | 52,130 |
Marketable securities: |  |  |  |  |  |  |  |  |
U.S. treasury securities |  |  | - |  |  |  | 833,137 |  |  |  | 833,137 |
U.S. agency obligations |  |  | - |  |  |  | 402,759 |  |  |  | 402,759 |
Corporate notes and bonds |  |  | - |  |  |  | 279,709 |  |  |  | 279,709 |
Commercial paper |  |  | - |  |  |  | 35,404 |  |  |  | 35,404 |
Derivative instruments: |  |  |  |  |  |  |  |  |
Foreign currency forward contracts |  |  | - |  |  |  | 3,219 |  |  |  | 3,219 |
Total assets |  | $ | 264,923 |  |  | $ | 1,606,358 |  |  | $ | 1,871,281 |
Liabilities: |  |  |  |  |  |  |  |  |
Derivative instruments: |  |  |  |  |  |  |  |  |
Foreign currency forward contracts |  | $ | - |  |  | $ | 1,272 |  |  | $ | 1,272 |
Total liabilities |  | $ | - |  |  | $ | 1,272 |  |  | $ | 1,272 |
The Company classifies its highly liquid money market funds within Level 1 of the fair value hierarchy because they are valued based on quoted market prices in active markets. The Company classifies its U.S. treasury securities, corporate notes and bonds, U.S. agency obligations, commercial paper, and foreign currency forward contracts within Level 2 of the fair value hierarchy because they are valued using inputs other than quoted prices that are directly or indirectly observable in the market, including readily available pricing sources for the identical underlying security that may not be actively traded. There were no transfers of financial instruments between valuation levels during the three and six months ended June 30, 2024 and 2023. As of June 30, 2024 and December 31, 2023, the total estimated fair value of the Company’s 0% convertible senior notes due 2027 was $949.7 million and $917.9 million, respectively. The fair value was determined based on the quoted price of the convertible senior notes in an inactive market on the last trading day of the reporting period and is classified within Level 2 of the fair value hierarchy. See Note 8 for further information on the Company’s convertible senior notes.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 940 -SubTopic 820 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478119/940-820-50-1 + Details
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