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Fair Value Measurements | 12 Months Ended
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Dec. 31, 2023
Fair Value Disclosures [Abstract] |
Fair Value Measurements | 4. Fair Value Measurements The Company measures the fair value of money market funds based on quoted prices in active markets for identical securities. Investments also include commercial paper and government securities that are valued either based on recent trades of securities in inactive markets or based on quoted market prices of similar instruments and other significant inputs derived from or corroborated by observable market data. The carrying amounts reflected in the consolidated balance sheets for cash, prepaid expenses and other current assets, accounts payable and accrued expenses approximate their fair values, due to their short-term nature. Assets measured at fair value on a recurring basis as of December 31, 2023 were as follows (in thousands):
|  | Total |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Money market funds, included in cash and cash equivalents |  | $ | 158,706 |  |  | $ | 158,706 |  |  | $ | — |  |  | $ | — |
MS APA asset |  | $ | 1,448 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,448 |
Total |  | $ | 160,154 |  |  | $ | 158,706 |  |  | $ | — |  |  | $ | 1,448 |
Assets measured at fair value on a recurring basis as of December 31, 2022 were as follows (in thousands):
|  | Total |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Money market funds, included in cash and cash equivalents |  | $ | 14,904 |  |  | $ | 14,904 |  |  | $ | — |  |  | $ | — |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | $ | 14,935 |  |  |  | — |  |  |  | 14,935 |  |  |  | — |
Government securities |  | $ | 3,980 |  |  |  | — |  |  |  | 3,980 |  |  |  | — |
Total |  | $ | 33,819 |  |  | $ | 14,904 |  |  | $ | 18,915 |  |  | $ | — |
As noted previously in Note 1, at the effective time of the Transaction, the Company entered into the CVR Agreement providing for the payment of certain contingent cash payments equal to the net amount of proceeds actually received by the Company or its subsidiaries after the end of each fiscal quarter following the first anniversary of the closing of the Transaction related to the disposition of assets related to the Company’s former multiple sclerosis programs, with the time periods and subject to deductions as provided therein. The Company concluded that the CVR is a derivative liability and is accounted for at fair value, which was $1.4 million as of December 31, 2023 of which $0.4 million is included in accrued expenses and other current liabilities and the remaining $1.0 million in other non-current liabilities in the consolidated balance sheet. Concurrently, the Company entered into the MS APA with Progentos, whereby Progentos acquired the rights, title and interest in certain assets related to the Company’s MS program. The MS APA included initial consideration of $0.5 million in proceeds that were settled through net cash at the merger closing and will be entitled to future milestone payments of up to $17.5 million as well as a $0.7 million payment in the event of Progentos closing of an equity financing at or above a specified amount. The Company concluded that the MS APA is a derivative asset and is accounted for at fair value, which was $1.4 million as of December 31, 2023 of which $0.4 million is included in prepaid and other current assets and the remaining $1.0 million in other long-term assets in the consolidated balance sheet. The fair value of the CVR liability and the MS APA are based on significant unobservable inputs, which represent Level 3 measurements within the fair value hierarchy. In determining the fair value of the CVR liability and the MS APA asset, the Company used the income approach, primarily discounted cash flow models. The discounted cash flow models require the use of significant judgment, estimates and assumptions, including the probability of technical and regulatory success, and discount rates. For the year ended December 31, 2023, the aggregate change in fair value of the CVR liability and MS APA asset was $0.08 million. There were no liabilities measured at fair value on a recurring basis as of December 31, 2022. There were no changes in valuation techniques, no r were there any transfers among the fair value hierarchy levels during the years ended December 31, 2023 or 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 -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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