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Fair Value Measurements | 9 Months Ended
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Sep. 30, 2021
Fair Value Measurements |
Fair Value Measurements | 4. Fair Value Measurements The Company's financial assets and liabilities carried at fair value are comprised of investment assets that include money market and investments. The fair value accounting guidance requires that assets and liabilities be carried at fair value and classified in one of the following three categories: Level I: Quoted prices in active markets for identical assets and liabilities that the Company has the ability to access. Level II: Observable market-based inputs or unobservable inputs that are corroborated by market data, such as quoted prices, interest rates, and yield curves. Level III: Inputs that are unobservable data points that are not corroborated by market data. This hierarchy requires the Company to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value. Assets and Liabilities That Are Measured at Fair Value on a Recurring Basis ​ The following table represents the fair value hierarchy for the Company’s financial assets and financial liabilities measured at fair value on a recurring basis: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2021 | ​ | December 31, 2020
​ |  | Level I | Level II | Level III |  | Total |  | Level I | Level II | Level III |  | Total
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | (in thousands)
Financial Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Money market deposits | ​ | $ | 55,703 | $ | — | $ | — | ​ | $ | 55,703 | ​ | $ | 28,990 | $ | — | $ | — | ​ | $ | 28,990
U.S. Treasury securities | ​ | ​ | 787,875 | ​ | — | ​ | — | ​ | ​ | 787,875 | ​ | ​ | 597,744 | ​ | — | ​ | — | ​ | ​ | 597,744
Corporate bonds and notes | ​ | ​ | — | ​ | 52,721 | ​ | — | ​ | ​ | 52,721 | ​ | ​ | — | ​ | 12,328 | ​ | — | ​ | ​ | 12,328
Municipal securities | ​ | ​ | — | ​ | 88,000 | ​ | — | ​ | ​ | 88,000 | ​ | ​ | — | ​ | 78,534 | ​ | — | ​ | ​ | 78,534
Total financial assets | ​ | $ | 843,578 | $ | 140,721 | $ | — | ​ | $ | 984,299 | ​ | $ | 626,734 | $ | 90,862 | $ | — | ​ | $ | 717,596
​ Fair Value of Long-Term Debt: As of September 30, 2021, the estimated fair value of the Convertible Notes, which are not presented at fair value on the Condensed Consolidated Balance Sheets as of September 30, 2021, was $863.3 million and was based upon observable, Level 2 inputs, including pricing information from recent trades of the Convertible Notes (see Note 10, Debt).

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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