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FAIR VALUE MEASUREMENTS | 6 Months Ended
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Jun. 30, 2023
Fair Value Disclosures [Abstract] |
FAIR VALUE MEASUREMENTS | 2. FAIR VALUE MEASUREMENTS Cash Equivalents and Marketable Securities Cash equivalents, restricted cash and marketable securities by security type at June 30, 2023 were as follows:
|  |  |  |  | Gross |  |  | Gross |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
(In thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Included in cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 34,417 |  |  | $ | — |  |  | $ | — |  |  | $ | 34,417 |
|  | $ | 34,417 |  |  | $ | — |  |  | $ | — |  |  | $ | 34,417 |
Restricted cash: |  |  |  |  |  |  |  |  |  |  |  |
Money market fund |  | $ | 263 |  |  | $ | — |  |  | $ | — |  |  | $ | 263 |
Certificate of deposit |  |  | 272 |  |  |  | — |  |  |  | — |  |  |  | 272 |
|  | $ | 535 |  |  | $ | — |  |  | $ | — |  |  | $ | 535 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
Government-sponsored enterprise securities (due in less than one year) |  | $ | 78,280 |  |  | $ | 20 |  |  | $ | (224 | ) |  | $ | 78,076 |
Government-sponsored enterprise securities (due in one to two years) |  |  | 18,680 |  |  |  | — |  |  |  | (141 | ) |  |  | 18,539 |
Commercial paper (due in less than one year) |  |  | 202,540 |  |  |  | 7 |  |  |  | (365 | ) |  |  | 202,182 |
Corporate notes (due in less than one year) |  |  | 34,354 |  |  |  | 1 |  |  |  | (138 | ) |  |  | 34,217 |
Corporate notes (due in one to two years) |  |  | 9,854 |  |  |  | — |  |  |  | (112 | ) |  |  | 9,742 |
|  | $ | 343,708 |  |  | $ | 28 |  |  | $ | (980 | ) |  | $ | 342,756 |
Cash equivalents, restricted cash and marketable securities by security type at December 31, 2022 were as follows:
|  |  |  |  | Gross |  |  | Gross |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
(In thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Included in cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 39,771 |  |  | $ | — |  |  | $ | — |  |  | $ | 39,771 |
|  | $ | 39,771 |  |  | $ | — |  |  | $ | — |  |  | $ | 39,771 |
Restricted cash: |  |  |  |  |  |  |  |  |  |  |  |
Money market fund |  | $ | 93 |  |  | $ | — |  |  | $ | — |  |  | $ | 93 |
Certificate of deposit |  |  | 271 |  |  |  | — |  |  |  | — |  |  |  | 271 |
|  | $ | 364 |  |  | $ | — |  |  | $ | — |  |  | $ | 364 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities (due in less than one year) |  | $ | 12,983 |  |  | $ | — |  |  | $ | (62 | ) |  | $ | 12,921 |
Municipal securities (due in less than one year) |  |  | 3,000 |  |  |  | — |  |  |  | (24 | ) |  |  | 2,976 |
Government-sponsored enterprise securities (due in less than one year) |  |  | 9,860 |  |  |  | — |  |  |  | (14 | ) |  |  | 9,846 |
Commercial paper (due in less than one year) |  |  | 64,285 |  |  |  | 6 |  |  |  | (92 | ) |  |  | 64,199 |
Corporate notes (due in less than one year) |  |  | 26,014 |  |  |  | — |  |  |  | (55 | ) |  |  | 25,959 |
|  | $ | 116,142 |  |  | $ | 6 |  |  | $ | (247 | ) |  | $ | 115,901 |
Cash equivalents and marketable securities with unrealized losses that have been in a continuous unrealized loss position for less than 12 months and 12 months or longer at June 30, 2023 and December 31, 2022 were as follows:
|  | Less Than 12 Months |  |  | 12 Months or Longer |  |  | Total |
|  |  |  |  | Gross |  |  |  |  |  | Gross |  |  |  |  |  | Gross |
|  | Estimated |  |  | Unrealized |  |  | Estimated |  |  | Unrealized |  |  | Estimated |  |  | Unrealized |
(In thousands) |  | Fair Value |  |  | Losses |  |  | Fair Value |  |  | Losses |  |  | Fair Value |  |  | Losses |
As of June 30, 2023: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government-sponsored enterprise securities (due in less than one year) |  | $ | 58,651 |  |  | $ | (224 | ) |  | $ | — |  |  | $ | — |  |  | $ | 58,651 |  |  | $ | (224 | )
Government-sponsored enterprise securities (due in one to two years) |  |  | 18,538 |  |  |  | (141 | ) |  |  | — |  |  |  | — |  |  |  | 18,538 |  |  |  | (141 | )
Commercial paper (due in less than one year) |  |  | 169,851 |  |  |  | (365 | ) |  |  | — |  |  |  | — |  |  |  | 169,851 |  |  |  | (365 | )
Corporate notes (due in less than one year) |  |  | 29,211 |  |  |  | (138 | ) |  |  | — |  |  |  | — |  |  |  | 29,211 |  |  |  | (138 | )
Corporate notes (due in one to two years) |  |  | 8,746 |  |  |  | (112 | ) |  |  | — |  |  |  | — |  |  |  | 8,746 |  |  |  | (112 | )
|  | $ | 284,997 |  |  | $ | (980 | ) |  | $ | — |  |  | $ | — |  |  | $ | 284,997 |  |  | $ | (980 | )
As of December 31, 2022: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities (due in less than one year) |  | $ | 11,424 |  |  | $ | (57 | ) |  | $ | 1,497 |  |  | $ | (5 | ) |  | $ | 12,921 |  |  | $ | (62 | )
Municipal securities (due in less than a year) |  |  | — |  |  |  | — |  |  |  | 2,976 |  |  |  | (24 | ) |  |  | 2,976 |  |  |  | (24 | )
Government-sponsored enterprise securities (due in less than one year) |  |  | 9,845 |  |  |  | (14 | ) |  |  | — |  |  |  | — |  |  |  | 9,845 |  |  |  | (14 | )
Commercial paper (due in less than one year) |  |  | 52,454 |  |  |  | (92 | ) |  |  | — |  |  |  | — |  |  |  | 52,454 |  |  |  | (92 | )
Corporate notes (due in less than one year) |  |  | 1,998 |  |  |  | (2 | ) |  |  | 23,962 |  |  |  | (53 | ) |  |  | 25,960 |  |  |  | (55 | )
|  | $ | 75,721 |  |  | $ | (165 | ) |  | $ | 28,435 |  |  | $ | (82 | ) |  | $ | 104,156 |  |  | $ | (247 | )
The gross unrealized losses related to U.S. Treasury securities, municipal securities, government-sponsored enterprise securities, commercial paper and corporate notes as of June 30, 2023 and December 31, 2022 were due to changes in interest rates and not credit risk. If an available-for-sale security’s fair value is less than its amortized cost basis, we evaluate whether the decline is the result of a credit loss, in which case an impairment is recorded through an allowance for credit losses. We have not recorded any allowances for credit losses on our available-for-sale securities for the three and six months ended June 30, 2023 and 2022 as we have not identified any unrealized losses for these securities attributable to credit factors. Our exposure to unrealized losses may increase in the future due to the economic pressures or uncertainties associated with macroeconomic or other global economic conditions, including those resulting from inflation, rising interest rates, prospects of a recession, bank failures and other disruptions to financial systems, civil or political unrest, military conflicts, pandemics or other health crises. Fair Value on a Recurring Basis We categorize financial instruments recorded at fair value on our condensed consolidated balance sheets based upon the level of judgment associated with inputs used to measure their fair value. The categories are as follows:
| Level 1 | — | Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date. An active market for an asset or liability is a market in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis.
| Level 2 | — | Inputs (other than quoted market prices included in Level 1) are either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument’s anticipated life.
| Level 3 | — | Inputs reflect management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration is given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model.
A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Money market funds are categorized as Level 1 within the fair value hierarchy as their fair values are based on quoted prices available in active markets. U.S. Treasury securities, municipal securities, government-sponsored enterprise securities, commercial paper, and corporate notes are categorized as Level 2 within the fair value hierarchy as their fair values are estimated by using pricing models, quoted prices of securities with similar characteristics or discounted cash flows. The following table presents information about our financial instruments that are measured at fair value on a recurring basis as of June 30, 2023 and December 31, 2022 and indicates the fair value category assigned.
|  | Fair Value Measurements at Reporting Date Using |
|  | Quoted Prices in |  |  |  |  |  | Significant |  |  |  |
|  | Active Markets for |  |  | Significant Other |  |  | Unobservable |  |  |  |
|  | Identical Assets |  |  | Observable Inputs |  |  | Inputs |  |  |  |
(In thousands) |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
As of June 30, 2023: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds(1)(2) |  | $ | 34,680 |  |  | $ | — |  |  | $ | — |  |  | $ | 34,680 |
Certificate of deposit(2) |  |  | 272 |  |  |  | — |  |  |  | — |  |  |  | 272 |
Government-sponsored enterprise securities(3)(4) |  |  | — |  |  |  | 96,615 |  |  |  | — |  |  |  | 96,615 |
Commercial paper(3) |  |  | — |  |  |  | 202,182 |  |  |  | — |  |  |  | 202,182 |
Corporate notes(3)(4) |  |  | — |  |  |  | 43,959 |  |  |  | — |  |  |  | 43,959 |
Total |  | $ | 34,952 |  |  | $ | 342,756 |  |  | $ | — |  |  | $ | 377,708 |
As of December 31, 2022: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds(1)(2) |  | $ | 39,864 |  |  | $ | — |  |  | $ | — |  |  | $ | 39,864 |
Certificate of deposit(2) |  |  | 271 |  |  |  | — |  |  |  | — |  |  |  | 271 |
U.S. Treasury securities(3) |  |  | — |  |  |  | 12,921 |  |  |  | — |  |  |  | 12,921 |
Municipal securities(3) |  |  | — |  |  |  | 2,976 |  |  |  | — |  |  |  | 2,976 |
Government-sponsored enterprise securities(2) |  |  | — |  |  |  | 9,846 |  |  |  | — |  |  |  | 9,846 |
Commercial paper(3) |  |  | — |  |  |  | 64,199 |  |  |  | — |  |  |  | 64,199 |
Corporate notes(3) |  |  | — |  |  |  | 25,959 |  |  |  | — |  |  |  | 25,959 |
Total |  | $ | 40,135 |  |  | $ | 115,901 |  |  | $ | — |  |  | $ | 156,036 |
(1) Included in cash and cash equivalents on our condensed consolidated balance sheets. (2) Included in restricted cash on our condensed consolidated balance sheets. (3) Included in current portion of marketable securities on our condensed consolidated balance sheets. (4) Included in noncurrent portion of marketable securities on our condensed consolidated balance sheets.

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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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