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Fair Value of Financial Instruments | 6 Months Ended
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Jun. 30, 2023
Fair Value Disclosures [Abstract] |
Fair Value of Financial Instruments | Fair Value of Financial Instruments The fair values of the financial instruments we measure at fair value on a recurring basis are as follows (in thousands):
| June 30, 2023
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 799,282 |  |  | $ | — |  |  | $ | — |  |  | $ | 799,282 |
Commercial paper | — |  |  | 109,455 |  |  | — |  |  | 109,455 |
Marketable securities: |  |  |  |  |  |  |
Corporate bonds | — |  |  | 324,087 |  |  | — |  |  | 324,087 |
Commercial paper | — |  |  | 238,974 |  |  | — |  |  | 238,974 |
U.S. treasury securities | 206,302 |  |  | — |  |  | — |  |  | 206,302 |
Certificates of deposit | — |  |  | 188,305 |  |  | — |  |  | 188,305 |
U.S. agency bonds | — |  |  | 123,040 |  |  | — |  |  | 123,040 |
Non-U.S. government and supranational bonds | — |  |  | 19,210 |  |  | — |  |  | 19,210 |
Municipal securities | — |  |  | 15,638 |  |  | — |  |  | 15,638 |
Prepaid expenses and other current assets: |  |  |  |  |  |  |
Certificates of deposit | — |  |  | 2,243 |  |  | — |  |  | 2,243 |
Other assets: |  |  |  |  |  |  |
Certificates of deposit | $ | — |  |  | $ | 4,353 |  |  | $ | — |  |  | $ | 4,353 |
| December 31, 2022
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 1,017,191 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,017,191 |
Commercial paper | — |  |  | 111,975 |  |  | — |  |  | 111,975 |
Corporate bonds | — |  |  | 1,542 |  |  | — |  |  | 1,542 |
U.S. treasury securities | 5,990 |  |  | — |  |  | — |  |  | 5,990 |
Marketable securities: |  |  |  |  |  |  |
Corporate bonds | — |  |  | 363,075 |  |  | — |  |  | 363,075 |
Commercial paper | — |  |  | 241,192 |  |  | — |  |  | 241,192 |
U.S. treasury securities | 242,916 |  |  | — |  |  | — |  |  | 242,916 |
Certificates of deposit | — |  |  | 158,246 |  |  | — |  |  | 158,246 |
Municipal securities | — |  |  | 27,449 |  |  | — |  |  | 27,449 |
Non-U.S. government and supranational bonds | — |  |  | 22,599 |  |  | — |  |  | 22,599 |
U.S. agency bonds | — |  |  | 31,687 |  |  | — |  |  | 31,687 |
Prepaid expenses and other current assets: |  |  |  |  |  |  |
Certificates of deposit | — |  |  | 1,067 |  |  | — |  |  | 1,067 |
Other assets: |  |  |  |  |  |  |
Certificates of deposit | $ | — |  |  | $ | 5,530 |  |  | $ | — |  |  | $ | 5,530 |
We classify our marketable securities within Level 1 or Level 2 because we determine their fair values using quoted market prices or alternative pricing sources and models utilizing market observable inputs. Gross unrealized gains and losses on our marketable securities were immaterial in the aggregate as of June 30, 2023 and December 31, 2022. We evaluated all available evidence and did not recognize any allowance for credit losses for our marketable securities as of June 30, 2023 and December 31, 2022. The fair value of our marketable securities by contractual maturity is as follows (in thousands):
| June 30, 2023
Due in one year or less | $ | 849,183 |
Due after one to five years | 266,373 |
Total | $ | 1,115,556 |
Net realized gains and losses from sales of available-for-sale securities were not material for any period presented.

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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 -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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