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Fair Value Measurements and Available for Sale Investments
 9 Months Ended
Sep. 30, 2024
Fair Value Measurements And Available For Sale Investments [Abstract]  
Fair Value Measurements and Available for Sale Investments Fair Value Measurements and Available for Sale Investments
Fair Value Measurements
The accounting guidance defines fair value, establishes a consistent framework for measuring fair value and expands disclosure for each major asset and liability category measured at fair value on either a recurring or nonrecurring basis. Fair value is defined as an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, the accounting guidance establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows:
Level 1: Observable inputs such as quoted prices in active markets;
Level 2: Inputs, other than the quoted prices in active markets, that are observable either directly or indirectly; and
Level 3: Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.
The Company classifies its cash equivalents and available-for-sale investments within Level 1 or Level 2. The fair value of the Company’s investment grade corporate debt securities and commercial paper classified as Level 2 is determined using proprietary valuation models and analytical tools, which utilize market pricing or prices for similar instruments that are both objective and publicly available, such as matrix pricing or reported trades, benchmark yields, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, and offers.
Assets and Liabilities Measured at Fair Value on a Recurring Basis
The following table presents the hierarchy for assets measured at fair value on a recurring basis as of September 30, 2024 and December 31, 2023 (in thousands):
Fair Value Measurements at End of Period Using:
Total
Fair Value		Quoted Market
Prices for
Identical Assets
(Level 1)		Significant
Other Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
As of September 30, 2024
Money market funds$25,338 $25,338 $— $— 
U.S. Treasury and agency securities71,561 71,561 — — 
Commercial paper207,182 — 207,182 — 
Corporate debt securities19,827 — 19,827 — 
As of December 31, 2023
Money market funds$25,222 $25,222 $— $— 
U.S. Treasury and agency securities92,309 92,309 — — 
Commercial paper168,534 — 168,534 — 
Corporate debt securities3,473 — 3,473 — 
The Company did not reclassify any investments between levels in the fair value hierarchy during the periods presented.
Fair Value of Other Financial Instruments
As of September 30, 2024 and December 31, 2023, the carrying amounts of the Company’s financial instruments, which include cash, prepaid and other current assets, interest receivable, accrued research and development expenses, accounts payable and accrued expenses and other current liabilities, approximate fair values because of their short-term maturities.
There was $0.1 million of interest receivable as of September 30, 2024, and there was no significant interest receivable as of December 31, 2023. Interest receivable is recorded as a component of prepaid expenses and other current assets on the condensed balance sheets.
As of September 30, 2024 and December 31, 2023, the fair value of the Company’s 2027 Notes was $106.5 million and $74.9 million, respectively. The fair value was determined on the basis of market prices observable for similar instruments and is considered Level 2 in the fair value hierarchy (see Note 5).
Available for Sale Investments
The Company invests its excess cash in U.S. Treasury and agency securities, corporate debt securities, and commercial paper, which are classified as available-for-sale investments. These investments are carried at fair value and are included in the tables below. The Company evaluates securities with unrealized losses to determine whether such losses, if any, are due to credit-related factors. Realized gains and losses are calculated using the specific identification method and recorded in other income, net in the Company's condensed consolidated statement of operations and comprehensive loss. The Company does not intend to sell the investments and it is not more likely than not that the Company will be required to sell the investments before recover of their amortized cost basis.
The aggregate market value, cost basis, and gross unrealized gains and losses of available-for-sale investments by security type, classified in marketable securities and long-term investments as of September 30, 2024 and December 31, 2023 are as follows (in thousands):
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Total
Fair Value
As of September 30, 2024
U.S. Treasury and agency securities$71,539 $22 $— $71,561 
 Corporate debt securities19,789 38 — 19,827 
     Commercial paper206,813 375 (6)207,182 
Total marketable securities$298,141 $435 $(6)$298,570 
Number of securities with unrealized losses4 
As of December 31, 2023
U.S. Treasury and agency securities$92,294 $20 $(5)$92,309 
     Corporate debt securities3,467 6 — 3,473 
     Commercial paper168,488 76 (30)168,534 
Total marketable securities$264,249 $102 $(35)$264,316 
Number of securities with unrealized losses12 
As of September 30, 2024 and December 31, 2023, the Company classified $25.3 million and $25.2 million, respectively, of assets with original maturities of 90 days or less as cash and cash equivalents.
At each reporting date, the Company performs an evaluation of impairment to determine if any unrealized losses are due to credit-related factors. The Company records an allowance for credit losses when unrealized losses are due to credit-related factors. Factors considered when evaluating available-for-sale investments for impairment include the severity of the impairment, changes in underlying credit ratings, the financial condition of the issuer, the probability that the scheduled cash payments will continue to be made and the Company’s intent and ability to hold the investment until recovery of the amortized cost basis. The Company intends and has the ability to hold its investments in unrealized loss positions until their amortized cost basis has been recovered. As of September 30, 2024 and December 31, 2023, there were no material declines in the market value of the Company’s available-for-sale investments due to credit-related factors.
Contractual maturities of available-for-sale debt securities, as of September 30, 2024, were as follows (in thousands):
Estimated
 Fair Value
Less than one year$298,570 
Greater than one year— 
Total$298,570 
The Company has the ability, if necessary, to liquidate any of its cash equivalents and marketable securities to meet its liquidity needs in the next 12 months.