Fair value of financial assets and liabilities	3 Months Ended
Mar. 31, 2024
Fair value of financial assets and liabilities
Fair value of financial assets and liabilities	3. Fair value of financial assets and liabilities Financial assets and liabilities carried at fair value are to be classified and disclosed in one of the following three levels of the fair value hierarchy, of which the first two are considered observable and the last is considered unobservable: Level 1, Quoted prices in active markets for identical assets or liabilities; Level 2, Observable inputs (other than Level 1 quoted prices), such as quoted prices in active markets for similar assets or liabilities, quoted prices in markets that are not active for identical or similar assets or liabilities, or other inputs that are observable or can be corroborated by observable market data; Level 3, unobservable inputs that are supported by little or no market activity that are significant to determining the fair value of the assets or liabilities, including pricing models, discounted cash flow methodologies and similar techniques. The carrying values of cash, cash equivalents and restricted cash, accounts receivable, research and development incentives receivable, prepaid expenses and other current assets, accounts payable and accrued expenses and other current liabilities approximate their fair values due to the short-term nature of these assets and liabilities. As of March 31, 2024, and December 31, 2023, the carrying value of the long-term debt approximates its fair value, which was determined using unobservable Level 3 inputs, including quoted interest rates from a lender for borrowings with similar terms. Cash, cash equivalents and restricted cash The Company considers all highly liquid investments that are readily convertible to known amounts of cash with original maturities of three months or less at the date of purchase to be cash equivalents. As of March 31, 2024, the Company had cash equivalents of $22.4 million, consisting of interest-bearing money market funds which are considered Level 1 assets. As of December 31, 2023, the Company had cash equivalents of $72.3 million, consisting of $22.1 million of interest-bearing money market funds and $50.2 million of 30-day term deposits which are considered Level 1 assets. As of March 31, 2024, and December 31, 2023, there were no other assets or liabilities measured at fair value on a recurring basis. As of March 31, 2024, the Company had $0.5 million of restricted cash related to a collateralized letter of credit in connection with the Company’s lease for office and laboratory space in Cambridge, Massachusetts, which is included within other assets in the Company’s condensed consolidated balance sheet.

Fair value of financial assets and liabilities

3 Months Ended

Mar. 31, 2024

Fair value of financial assets and liabilities

Fair value of financial assets and liabilities

3. Fair value of financial assets and liabilities

Financial assets and liabilities carried at fair value are to be classified and disclosed in one of the following three levels of the fair value hierarchy, of which the first two are considered observable and the last is considered unobservable: Level 1, Quoted prices in active markets for identical assets or liabilities; Level 2, Observable inputs (other than Level 1 quoted prices), such as quoted prices in active markets for similar assets or liabilities, quoted prices in markets that are not active for identical or similar assets or liabilities, or other inputs that are observable or can be corroborated by observable market data; Level 3, unobservable inputs that are supported by little or no market activity that are significant to determining the fair value of the assets or liabilities, including pricing models, discounted cash flow methodologies and similar techniques.

The carrying values of cash, cash equivalents and restricted cash, accounts receivable, research and development incentives receivable, prepaid expenses and other current assets, accounts payable and accrued expenses and other current liabilities approximate their fair values due to the short-term nature of these assets and liabilities. As of March 31, 2024, and December 31, 2023, the carrying value of the long-term debt approximates its fair value, which was determined using unobservable Level 3 inputs, including quoted interest rates from a lender for borrowings with similar terms.

Cash, cash equivalents and restricted cash

The Company considers all highly liquid investments that are readily convertible to known amounts of cash with original maturities of three months or less at the date of purchase to be cash equivalents. As of March 31, 2024, the Company had cash equivalents of $22.4 million, consisting of interest-bearing money market funds which are considered Level 1 assets. As of December 31, 2023, the Company had cash equivalents of $72.3 million, consisting of $22.1 million of interest-bearing money market funds and $50.2 million of 30-day term deposits which are considered Level 1 assets. As of March 31, 2024, and December 31, 2023, there were no other assets or liabilities measured at fair value on a recurring basis.

As of March 31, 2024, the Company had $0.5 million of restricted cash related to a collateralized letter of credit in connection with the Company’s lease for office and laboratory space in Cambridge, Massachusetts, which is included within other assets in the Company’s condensed consolidated balance sheet.

- 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.

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