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Fair Value Measurements | 12 Months Ended
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Dec. 31, 2023
Fair Value Disclosures [Abstract] |
Fair Value Measurements | 4. Fair Value Measurements Cash, Cash Equivalents and Marketable Securities Held to Maturity The following table summarizes the Company's cash, cash equivalents and marketable securities held to maturity as of December 31, 2023:
|  | As of December 31, 2023 |
|  | Amortized Costs |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Cash and money market funds |  | $ | 751,323 |  |  | $ | — |  |  | $ | — |  |  | $ | 751,323 |
Total cash and cash equivalents |  | $ | 751,323 |  |  | $ | — |  |  | $ | — |  |  | $ | 751,323 |
|  | As of December 31, 2022 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Cash and money market funds |  | $ | 523,458 |  |  | $ | — |  |  | $ | — |  |  | $ | 523,458 |
Total cash and cash equivalents |  |  | 523,458 |  |  |  | — |  |  |  | — |  |  |  | 523,458 |
Marketable securities held to maturity: |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury bills - short-term |  |  | 100,299 |  |  |  | 24 |  |  |  | — |  |  |  | 100,323 |
Total cash, cash equivalents and marketable securities |  | $ | 623,757 |  |  | $ | 24 |  |  | $ | — |  |  | $ | 623,781 |
During the fourth quarter of 2022, the Company purchased $100.0 million of 6-month U.S. treasury bills with the positive intent and ability to hold them until maturity. Therefore, the Company classified this investment as held to maturity and stated it at amortized cost on the consolidated balance sheets. There is no comparable investment as of December 31, 2023. The amortized cost and fair value of the Company's held to maturity securities by contractual maturity at December 31, 2022 are summarized below. There were no comparable investments as of December 31, 2023:
|  | December 31, 2022 |  |
|  | Amortized Costs |  |  | Estimated Fair Value |  |
Maturity of one year or less |  | $ | 100,299 |  |  | $ | 100,323 |  |
Total |  | $ | 100,299 |  |  | $ | 100,323 |  |
Fair Value Measured on a Recurring Basis Financial assets and financial liabilities measured at fair value on a recurring basis consist of the following as of December 31, 2023 and 2022:
|  | As of December 31, 2023 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Money market accounts |  | $ | 658,574 |  |  | $ | — |  |  | $ | — |  |  | $ | 658,574 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Short-term contingent consideration |  | $ | — |  |  | $ | — |  |  | $ | 12,983 |  |  | $ | 12,983 |
Long-term contingent consideration |  | $ | — |  |  | $ | — |  |  | $ | 14,070 |  |  | $ | 14,070 |
|  | As of December 31, 2022 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Money market accounts |  | $ | 343,929 |  |  | $ | — |  |  | $ | — |  |  | $ | 343,929 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Short-term contingent consideration |  | $ | — |  |  | $ | — |  |  | $ | 13,950 |  |  | $ | 13,950 |
Long-term contingent consideration |  | $ | — |  |  | $ | — |  |  | $ | 51,559 |  |  | $ | 51,559 |
Contingent Consideration – Earnout As of December 31, 2023, the maximum amount of future contingent consideration (undiscounted) that the Company could be required to pay in connection with each of the completed acquisitions is; $125.0 million over a three-year earnout period for Avitide, which was acquired in September 2021 and for which the earnout periods run from January 1, 2022 through December 31, 2024; $42.0 million over a two-year earnout period for FlexBiosys, which was acquired in April 2023 and for which the earnout periods run from January 1, 2023 through December 31, 2024; and approximately $10 million over a one-year earnout period for Metenova, which was acquired in October 2023 and for which the earnout period runs from January 1, 2024 through December 31, 2024. See Note 5, “Acquisitions” to this report for more information on the contingent consideration earnouts. During 2023, expected results and change in market inputs used to calculate the discount rate, resulted in a decrease in amounts reported as of December 31, 2023. A reconciliation of the change in fair value of contingent consideration – earnout is included in the following table (amounts in thousands):
Balance at December 31, 2022 |  | $ | 65,509 |
Acquisition date fair value of contingent consideration earnouts |  |  | 6,640 |
Payment of contingent consideration earnouts |  |  | (14,527 | )
Decrease in fair value of contingent consideration earnouts |  |  | (30,569 | )
Balance at December 31, 2023 |  | $ | 27,053 |
The recurring Level 3 fair value measurement of our contingent consideration – earnout that we expect to be required to settle our 2023, 2024 and 2025 contingent consideration obligation for Avitide, FlexBiosys and Metenova include the following significant unobservable inputs (amounts in thousands, except percent data):
Contingent Consideration Earnout |  | Fair Value as of December 31, 2023 |  |  | Valuation Technique |  | Unobservable Input |  | Range |  | Weighted Average(1)
|  |  |  |  |  |  |  | Probability of |  |  |  |
|  |  |  |  |  |  |  | Success |  | 100% |  | 100%
Commercialization-based payments |  | $ |  | 20,094 |  |  | Monte Carlo Simulation |  | Earnout Discount Rate |  | 5.8%-5.9% |  | 5.9%
|  |  |  |  |  |  |  | Volatility |  | 12.5%-24.6% |  | 21.9%
Revenue and Volume- based payments |  | $ |  | 1,454 |  |  | Monte Carlo Simulation |  | Revenue & Volume Discount Rate |  | 2.5%-9.3% |  | 8.3%
|  |  |  |  |  |  |  | Earnout Discount Rate |  | 5.8%-7.2% |  | 6.1%
|  |  |  |  |  |  |  | Probability of Success |  | 100% |  | 100%
Manufacturing line expansions |  | $ |  | 5,505 |  |  | Probability-weighted present value |  | Earnout Discount Rate |  | 6.1%-6.4% |  | 6.3%
(1) Unobservable inputs were weighted by the relative fair value of the contingent consideration liability. The Company estimates the fair value of the contingent consideration earnouts using a Monte Carlo simulation. Changes in the projected performance of the acquired business could result in a higher or lower contingent consideration obligation in the future. Fair Value Measured on a Nonrecurring Basis During 2023, there were no re-measurements to fair value of financial assets and liabilities that are measured at fair value on a nonrecurring basis. Convertible Senior Notes In July 2019, the Company issued $287.5 million aggregate principal amount of the 2019 Notes. Interest is payable semi-annually in arrears on January 15 and July 15 of each year. The 2019 Notes will mature on July 15, 2024, unless earlier converted or repurchased in accordance with their terms. At December 31, 2023 and 2022, subsequent to the adoption of ASU 2020-06, the carrying value of the 2019 Notes was $69.5 million and $284.6 million, respectively, net of unamortized debt issuance costs and the fair value of the 2019 Notes was $109.8 million and $452.0 million, respectively. The fair value of the 2019 Notes is a Level 1 valuation and was determined based on the most recent trade activity of the 2019 Notes as of December 31, 2023 and 2022. The 2019 Notes are discussed in more detail in Note 15, “Convertible Senior Notes,” to these consolidated financial statements. On December 14, 2023, the Company issued $600.0 million aggregate principal amount of its 2023 Notes in a private placement pursuant to separate, privately negotiated exchange and subscription agreements (the “Exchange and Subscription Agreements”) with a limited number of holders of its outstanding 2019 Notes and certain other qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended (“Securities Act”). Pursuant to the Exchange and Subscription Agreements, the Company exchanged $217.7 million of its 2019 Notes for $309.9 million aggregate principal amount of the 2023 Notes (the “Exchange Transaction”) and issued $290.1 million aggregate principal amount of the 2023 Notes (the “Subscription Transactions”) for $290.1 million in cash. At December 31, 2023, the carrying value of the 2023 Notes was $510.1 million, net of unamortized debt issuance costs, and the fair value of the 2023 Notes was $596.0 million. The fair value of the 2023 Notes is a Level 1 valuation and was determined based on the most recent trade activity of the 2023 Notes as of December 31, 2023. The 2023 Notes are discussed in more detail in Note 15, “Convertible Senior Notes,” to these consolidated financial statements.

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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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