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Fair Value Measurements | 9 Months Ended
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Sep. 30, 2022
Fair Value Disclosures [Abstract] |
Fair Value Measurements | Fair Value Measurements The Company's financial instruments consist primarily of cash and cash equivalents, short-term investments, accounts receivable, accounts payable and accrued liabilities. The carrying value of accounts receivable, accounts payable and accrued liabilities approximate their fair value because of their short-term nature. Estimated fair value of available-for-sale securities are generally based on prices obtained from commercial pricing services. In connection with measuring the fair value of its assets and liabilities, the Company seeks to maximize the use of observable inputs (market data obtained from sources independent from the Company) and to minimize the use of unobservable inputs (the Company’s assumptions about how market participants would price assets and liabilities). As a basis for considering such assumptions, a three-tier fair value hierarchy has been established, which prioritizes the inputs used in measuring fair value as follows: •Level 1 - Observable inputs such as quoted prices (unadjusted) in active markets for identical assets or liabilities. •Level 2 - Inputs other than quoted prices that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active. •Level 3 - Unobservable inputs that reflect the reporting entity’s own assumptions. The following table summarizes the financial assets (cash, cash equivalents, restricted cash and short-term investments) measured at fair value on a recurring basis:
|  | September 30, 2022
(in thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Financial assets: |  |  |  |  |  |  |  |
Cash, cash equivalents and restricted cash |  | $ | 86,052 |  |  | $ | — |  |  | $ | — |  |  | $ | 86,052 |
U.S. agency security |  | — |  |  | 4,904 |  |  | — |  |  | 4,904 |
Corporate bond |  | — |  |  | 98,068 |  |  | — |  |  | 98,068 |
Commercial paper |  | 112,633 |  |  | — |  |  | — |  |  | 112,633 |
Treasury bill |  | — |  |  | 26,704 |  |  | — |  |  | 26,704 |
Treasury bond |  | — |  |  | 44,553 |  |  | — |  |  | 44,553 |
Yankee bond |  | — |  |  | 3,730 |  |  | — |  |  | 3,730 |
Total financial assets |  | $ | 198,685 |  |  | $ | 177,959 |  |  | $ | — |  |  | $ | 376,644 |
|  | December 31, 2021
(in thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Financial assets: |  |  |  |  |  |  |  |
Cash, cash equivalents and restricted cash |  | $ | 231,900 |  |  | $ | — |  |  | $ | — |  |  | $ | 231,900 |
Certificates of deposit |  | — |  |  | 3,140 |  |  | — |  |  | 3,140 |
Corporate bond |  | — |  |  | 21,820 |  |  | — |  |  | 21,820 |
Commercial paper |  | 206,724 |  |  | — |  |  | — |  |  | 206,724 |
Treasury bill |  | — |  |  | 2,494 |  |  | — |  |  | 2,494 |
Total financial assets |  | $ | 438,624 |  |  | $ | 27,454 |  |  | $ | — |  |  | $ | 466,078 |
The Company's Level 1 instruments include cash, cash equivalents, restricted cash and commercial paper that are valued using quoted market prices. We estimate the fair values of our investments in corporate debt securities, government and government related securities and certificates of deposits by taking into consideration valuations obtained from third-party pricing services. The fair value of our short-term investments classified within Level 2 is based upon observable inputs that may include benchmark yield curves, reported trades, issuer spreads, benchmark securities and reference data including market research publications. At September 30, 2022, and December 31, 2021, the weighted average remaining contractual maturities of our Level 1 and 2 investments were approximately for 7 months and 8 months, respectively. These investments have an overall rating of A-1, or higher, by Moody’s, Standard & Poor’s and Fitch. No credit loss allowance was recorded as of September 30, 2022, as we do not believe the unrealized loss is a result of a credit loss due to the nature of our investments. We also considered the current and expected future economic and market conditions and determined that the estimate of credit losses was not significantly impacted. Refer to Note 4, “Cash, Cash Equivalents, Restricted Cash and Short-Term Investments,” for the carrying amount and related unrealized gains (losses) by type of investment.

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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 https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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