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Fair Value Measurements | 12 Months Ended
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Dec. 31, 2024
Fair Value Disclosures [Abstract] |
Fair Value Measurements | Fair Value Measurements Fair value is defined as the exchange price that would be received from sale of an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Assets and liabilities measured at fair value are classified into the following categories: •Level I: Observable inputs are unadjusted quoted prices in active markets for identical assets or liabilities; •Level II: Observable inputs are quoted prices for similar assets and liabilities in active markets or inputs other than quoted prices that are observable for the assets or liabilities, either directly or indirectly through market corroboration, for substantially the full term of the financial instruments; and •Level III: Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. These inputs are based on the Company’s own assumptions used to measure assets and liabilities at fair value and require significant management judgment or estimation. The Company classifies money market funds within Level I of the fair value hierarchy because they are valued based on quoted market prices in active markets. The Company classifies its investments, which are comprised of U.S. treasury securities, U.S. government agency securities, commercial paper, and corporate bonds, within Level II of the fair value hierarchy because the fair value of these securities is priced by using inputs based on non-binding market consensus prices that are primarily corroborated by observable market data or quoted market prices for similar instruments. The Company recognizes transfers between levels within the fair value hierarchy, if any, at the end of each period. There were no transfers between levels during the periods presented. The following table summarizes the Company’s cash and available-for-sale securities’ amortized cost, unrealized gains (losses), and fair value by significant investment category reported as cash and cash equivalents, restricted cash short-term, restricted cash, or available-for-sale securities as of December 31, 2024 and 2023.
(in thousands) |  |  |  |  |  |  |  |  |  | Reported as:
December 31, 2024 |  | Amortized Cost |  | Unrealized Gain |  | Unrealized (Loss) |  | Fair Value |  | Cash & Cash Equivalents |  | Available-for-sale Securities |  | Restricted Cash (Current and Non-Current)
Cash |  | $ | 51,410 |  |  | $ | — |  |  | $ | — |  |  | $ | 51,410 |  |  | $ | 44,887 |  |  | $ | — |  |  | $ | 6,523 |
Level I: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | 102,804 |  |  | — |  |  | — |  |  | 102,804 |  |  | 102,804 |  |  | — |  |  | — |
Level II: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | 466,769 |  |  | 1,125 |  |  | (316) |  |  | 467,578 |  |  | — |  |  | 467,578 |  |  | — |
U.S. treasury securities |  | 1,120,478 |  |  | 2,403 |  |  | (677) |  |  | 1,122,204 |  |  | — |  |  | 1,122,204 |  |  | — |
U.S. government agency securities |  | 69,872 |  |  | 55 |  |  | (19) |  |  | 69,908 |  |  | — |  |  | 69,908 |  |  | — |
Commercial paper |  | 48,538 |  |  | — |  |  | — |  |  | 48,538 |  |  | — |  |  | 48,538 |  |  | — |
Subtotal |  | 1,705,657 |  |  | 3,583 |  |  | (1,012) |  |  | 1,708,228 |  |  | — |  |  | 1,708,228 |  |  | — |
Total assets measured at fair value on a recurring basis |  | $ | 1,859,871 |  |  | $ | 3,583 |  |  | $ | (1,012) |  |  | $ | 1,862,442 |  |  | $ | 147,691 |  |  | $ | 1,708,228 |  |  | $ | 6,523 |
(in thousands) |  |  |  |  |  |  |  |  |  | Reported as:
December 31, 2023 |  | Amortized Cost |  | Unrealized Gain |  | Unrealized (Loss) |  | Fair Value |  | Cash & Cash Equivalents |  | Available-for-sale Securities |  | Restricted Cash (Current and Non-Current)
Cash |  | $ | 51,189 |  |  | $ | — |  |  | $ | — |  |  | $ | 51,189 |  |  | $ | 46,829 |  |  | $ | — |  |  | $ | 4,360 |
Level I: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | 40,035 |  |  | — |  |  | — |  |  | 40,035 |  |  | 40,035 |  |  | — |  |  | — |
Level II: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | 312,510 |  |  | 718 |  |  | (378) |  |  | 312,850 |  |  | — |  |  | 312,850 |  |  | — |
U.S. treasury securities |  | 1,020,167 |  |  | 2,344 |  |  | (544) |  |  | 1,021,967 |  |  | — |  |  | 1,021,967 |  |  | — |
U.S. government agency securities |  | 84,154 |  |  | 14 |  |  | (96) |  |  | 84,072 |  |  | — |  |  | 84,072 |  |  | — |
Commercial paper |  | 167,989 |  |  | 2 |  |  | — |  |  | 167,991 |  |  | — |  |  | 167,991 |  |  | — |
Subtotal |  | 1,584,820 |  |  | 3,078 |  |  | (1,018) |  |  | 1,586,880 |  |  | — |  |  | 1,586,880 |  |  | — |
Total assets measured at fair value on a recurring basis |  | $ | 1,676,044 |  |  | $ | 3,078 |  |  | $ | (1,018) |  |  | $ | 1,678,104 |  |  | $ | 86,864 |  |  | $ | 1,586,880 |  |  | $ | 4,360 |
As of December 31, 2024, the Company had $6.5 million in total restricted cash, related to indemnity holdback consideration associated with asset acquisitions and business combinations. As of December 31, 2023, the Company had $4.4 million in total restricted cash, mainly related to irrevocable standby letters of credit and bank guarantees that are required under lease agreements and indemnity holdback consideration associated with asset acquisitions. The aggregate fair value of the Company’s money market funds approximated amortized cost and, as such, there were no unrealized gains or losses on money market funds as of December 31, 2024 and 2023. Realized gains and losses, net of tax, were not material for December 31, 2024, 2023 and 2022, respectively. The amortized cost of available-for-sale investments with maturities less than one year wa s $1,139.9 million and $1,185.1 million as of December 31, 2024 and 2023, respectively. The amortized cost of available-for-sale investments with maturities greater than one year was $565.8 million and $399.7 million as of December 31, 2024 and 2023, respectively. Net unrealized gain on investments were $2.6 million and $2.0 million as of December 31, 2024 and 2023, respectively and were included in accumulated other comprehensive income on the consolidated balance sheet. The unrealized gains and losses on available-for-sale investments are related to U.S. treasury securities, U.S. government agency securities, commercial paper, and corporate bonds. The Company determined any unrealized losses to be temporary. Factors considered in determining whether a loss is temporary include the financial condition and near-term prospects of the investee, the extent of the loss related to the credit of the issuer, the expected cash flows from the security, the Company’s intent to sell the security, and whether or not the Company will be required to sell the security before the recovery of its amortized cost. As of December 31, 2024, the Company's investment portfolio consisted of investment grade securities with an average credit rating of AA. The Company carries the 2026 Notes issued in August 2021 at face value less the unamortized issuance costs on its consolidated balance sheets and presents that fair value for disclosure purposes only. As of December 31, 2024, the fair value of the 2026 Notes was $1,242.8 million. The fair value of the 2026 Notes, which are classified as Level II financial instruments, was determined based on the quoted bid prices of the 2026 Notes in an over-the-counter market on the last trading day of the reporting period. The Company classifies financial instruments in Level III of the fair value hierarchy when there is reliance on at least one significant unobservable input to the valuation model. In addition to these unobservable inputs, the valuation models for Level III financial instruments typically also rely on a number of inputs that are readily observable, either directly or indirectly. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires management to make judgments and consider factors specific to the asset or liability. There were no financial instruments classified as Level III of the fair value hierarchy as of December 31, 2024 and December 31, 2023.

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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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