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Fair Value Measurement | 12 Months Ended
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Dec. 31, 2022
Fair Value Disclosures [Abstract] |
Fair Value Measurement | Fair Value Measurement Available-for-sale marketable securities consisted of the following (in thousands):
|  | December 31, 2022
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Asset-backed securities |  | $ | 1,146 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,146 |
Corporate debt securities |  | 7,139 |  |  | — |  |  | (9) |  |  | 7,130 |
U.S. Treasury securities |  | 111,469 |  |  | — |  |  | (934) |  |  | 110,535 |
Agency bonds |  | 2,783 |  |  | 2 |  |  | (1) |  |  | 2,784 |
Commercial paper |  | 7,004 |  |  | — |  |  | — |  |  | 7,004 |
|  | $ | 129,541 |  |  | $ | 2 |  |  | $ | (944) |  |  | $ | 128,599 |
|  | December 31, 2021
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Asset-backed securities |  | $ | 32,745 |  |  | $ | — |  |  | $ | (53) |  |  | $ | 32,692 |
Corporate debt securities |  | 58,885 |  |  | — |  |  | (86) |  |  | 58,799 |
U.S. Treasury securities |  | 231,230 |  |  | — |  |  | (469) |  |  | 230,761 |
Non-U.S. Government Securities |  | 17,232 |  |  | — |  |  | (12) |  |  | 17,220 |
Commercial paper |  | 282,731 |  |  | — |  |  | — |  |  | 282,731 |
|  | $ | 622,823 |  |  | $ | — |  |  | $ | (620) |  |  | $ | 622,203 |
As of December 31, 2022, 20 available-for-sale marketable securities with a fair market value of $117.2 million were in a gross unrealized loss position of $0.9 million. Based on our review of these marketable securities, we believe none of the unrealized loss is as a result of a credit loss as of December 31, 2022, because we do not intend to sell these securities and it is not more-likely-than-not that we will be required to sell these securities before the recovery of their amortized cost basis. The estimated fair value of our contractual maturities of available-for-sale debt securities are as follows (in thousands):
|  | December 31, 2022 |  | December 31, 2021
Due within one year |  | $ | 114,353 |  |  | $ | 500,965 |
After one but within five years |  | 14,246 |  |  | 121,238 |
|  | $ | 128,599 |  |  | $ | 622,203 |
The following table summarizes, by major security type, our cash equivalents and available-for-sale marketable securities that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy (in thousands):
|  | December 31, 2022 |  | December 31, 2021
|  | Level 1 |  | Level 2 |  | Total estimated fair value |  | Level 1 |  | Level 2 |  | Total estimated fair value
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 191,704 |  |  | $ | — |  |  | $ | 191,704 |  |  | $ | 118,707 |  |  | $ | — |  |  | $ | 118,707 |
Available-for-sale marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
Asset-backed securities |  | — |  |  | 1,146 |  |  | 1,146 |  |  | — |  |  | 32,692 |  |  | 32,692 |
Corporate debt securities |  | — |  |  | 7,130 |  |  | 7,130 |  |  | — |  |  | 58,799 |  |  | 58,799 |
U.S. Treasury securities |  | 110,535 |  |  | — |  |  | 110,535 |  |  | 230,761 |  |  | — |  |  | 230,761 |
Non-US Government securities |  | — |  |  | — |  |  | — |  |  | — |  |  | 17,220 |  |  | 17,220 |
Agency bonds |  | 2,784 |  |  | — |  |  | 2,784 |  |  |  |  |  |  |
Commercial paper |  | — |  |  | 7,004 |  |  | 7,004 |  |  | — |  |  | 282,731 |  |  | 282,731 |
|  | $ | 305,023 |  |  | $ | 15,280 |  |  | $ | 320,303 |  |  | $ | 349,468 |  |  | $ | 391,442 |  |  | $ | 740,910 |
We had no available for sale securities that were classified within Level 3 as of December 31, 2022 and 2021.

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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=123874694&loc=d3e19207-110258 + Details
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