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Fair Value Measurements | 12 Months Ended
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Dec. 31, 2022
Fair Value Disclosures [Abstract] |
Fair Value Measurements |
5. | Fair Value Measurements
For a description of the fair value hierarchy and fair value methodology, see Note 3, Summary of Significant Accounting Policies. As of December 31, 2022 and 2021, the Company’s highly liquid money market funds included within cash equivalents and U.S. government agency securities are valued using Level 1 inputs. There were no transfers in or out of Level 1 and Level 2 during the periods presented. U.S. government agency securities are bonds issued by the U.S. government and are fully backed by the U.S. government. Given the frequency at which U.S. government agency securities trade and the accessibility of observable, quoted prices for such assets in active markets, they are recognized as Level 1 assets. The following tables present the fair value hierarchy for financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2022 and 2021 (in thousands):
|  | December 31, 2022 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds(1) |  | $ | 21,666 |  |  | $ | — |  |  | $ | — |  |  | $ | 21,666 |
Total financial assets |  | $ | 21,666 |  |  | $ | — |  |  | $ | — |  |  | $ | 21,666 |
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CVR derivative liability |  | $ | — |  |  | $ | — |  |  | $ | 5,000 |  |  | $ | 5,000 |
Total financial liabilities |  | $ | — |  |  | $ | — |  |  | $ | 5,000 |  |  | $ | 5,000 |
|  | December 31, 2021 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds(1) |  | $ | 44,347 |  |  | $ | — |  |  | $ | — |  |  | $ | 44,347 |
U.S. government agency securities(2) |  |  | 2,504 |  |  |  | — |  |  |  | — |  |  |  | 2,504 |
Total financial assets |  | $ | 46,851 |  |  | $ | — |  |  | $ | — |  |  | $ | 46,851 |
(1) | Included in cash and cash equivalents on accompanying consolidated balance sheet.
(2) | Included in short-term investments on accompanying consolidated balance sheet and are classified as available-for-sale debt securities.
The carrying amounts of accounts and other receivables, accounts payable, and accrued liabilities approximate their fair values due to the short-term maturity of these instruments. Derivative Liabilities The CVR derivative liability relates to the CVR Agreement executed in connection with the Business Combination Agreement. The fair value of this derivative liability is based on significant unobservable inputs, which represent Level 3 measurements within the fair value hierarchy. The estimated fair value of the CVR liability was determined based on the anticipated amount and timing of projected cash flows to be received from Vertex pursuant to the Vertex asset purchase agreement. As of December 31, 2022, the Company expects to receive a $5.0 million hold-back payment from Vertex in the second quarter of 2023, which will be immediately distributed to the holders of Catalyst common stock as of January 5, 2023 under the CVR Agreement. The CVR liability was initially recorded at $5.0 million at issuance on December 26, 2022 and there was no change in the estimated fair value as of December 31, 2022.

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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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