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Fair Value Measurements | 12 Months Ended
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Dec. 31, 2023
Fair Value Disclosures [Abstract] |
Fair Value Measurements | 3. Fair Value Measurements The carrying amounts of cash and cash equivalents, accounts receivable, accounts payable and accrued expenses approximate fair value as of December 31, 2023 and 2022 because of the relatively short duration of these instruments. Marketable securities consist of time deposits, corporate debt securities, U.S. treasury securities, and commercial paper not otherwise classified as cash equivalents. All marketable securities are considered to be available-for-sale and are recorded at their estimated fair values. Unrealized gains and losses for available-for-sale securities are recorded in accumulated other comprehensive loss. The Company evaluated its financial assets and liabilities subject to fair value measurements on a recurring basis to determine the appropriate level in which to classify them for each reporting period. The following tables summarize the Company’s financial assets measured at fair value as of December 31, 2023 and 2022:
| Amortized cost or carrying value |  | Unrealized gains |  | Unrealized losses |  | Fair value measurements on a recurring basis December 31, 2023
Level 1 |  | Level 2 |  | Level 3 |  | Total
| (In thousands)
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market account | $ | 120,724 |  |  | $ | — |  |  | $ | — |  |  | $ | 120,724 |  |  | $ | — |  |  | $ | — |  |  | $ | 120,724 |
Total included in cash and cash equivalents | 120,724 |  |  | — |  |  | — |  |  | 120,724 |  |  | — |  |  | — |  |  | 120,724 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits | 20,000 |  |  | — |  |  | — |  |  | 20,000 |  |  | — |  |  | — |  |  | 20,000 |
Commercial paper | 1,422 |  |  | 66 |  |  | — |  |  | 1,488 |  |  | — |  |  | — |  |  | 1,488 |
Total marketable securities | 21,422 |  |  | 66 |  |  | — |  |  | 21,488 |  |  | — |  |  | — |  |  | 21,488 |
Total financial assets | $ | 142,146 |  |  | $ | 66 |  |  | $ | — |  |  | $ | 142,212 |  |  | $ | — |  |  | $ | — |  |  | $ | 142,212 |
| Amortized cost or carrying value |  | Unrealized gains |  | Unrealized losses |  | Fair value measurements on a recurring basis December 31, 2022
Level 1 |  | Level 2 |  | Level 3 |  | Total
| (In thousands)
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market account | $ | 36,728 |  |  | $ | — |  |  | $ | — |  |  | $ | 36,728 |  |  | $ | — |  |  | $ | — |  |  | $ | 36,728 |
Commercial paper | 28,254 |  |  | — |  |  | — |  |  | 28,254 |  |  | — |  |  | — |  |  | 28,254 |
Total included in cash and cash equivalents | 64,982 |  |  | — |  |  | — |  |  | 64,982 |  |  | — |  |  | — |  |  | 64,982 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits | 6,645 |  |  | — |  |  | (15) |  |  | 6,630 |  |  | — |  |  | — |  |  | 6,630 |
U.S. treasury securities | 14,718 |  |  | 74 |  |  | — |  |  | 14,792 |  |  | — |  |  | — |  |  | 14,792 |
Corporate debt securities | 23,412 |  |  | — |  |  | (97) |  |  | — |  |  | 23,315 |  |  | — |  |  | 23,315 |
Commercial paper | 26,142 |  |  | 352 |  |  | — |  |  | 26,494 |  |  | — |  |  | — |  |  | 26,494 |
Total marketable securities | 70,917 |  |  | 426 |  |  | (112) |  |  | 47,916 |  |  | 23,315 |  |  | — |  |  | 71,231 |
Total financial assets | $ | 135,899 |  |  | $ | 426 |  |  | $ | (112) |  |  | $ | 112,898 |  |  | $ | 23,315 |  |  | $ | — |  |  | $ | 136,213 |
The Company classifies its marketable securities as current assets as they are available for current operating needs. The following table summarizes the contractual maturities of marketable securities as of December 31, 2023:
| Amortized cost |  | Aggregate fair value
| (In thousands)
Financial assets: |  |  |
Less than one year | $ | 21,422 |  |  | $ | 21,488 |
Total | $ | 21,422 |  |  | $ | 21,488 |
As of December 31, 2023, the marketable securities were in an unrealized gain position. The Company has determined that (i) it does not have the intent to sell any of these investments and (ii) it is not more likely than not that it will be required to sell any of these investments before recovery of the entire amortized cost basis. As of December 31, 2023, the Company anticipates that it will recover the entire amortized cost basis of its marketable securities before maturity. During the years ended December 31, 2023 and 2022, there were $91.8 million and $74.3 million, respectively, in maturities of marketable securities. There were no maturities in marketable securities during the year ended December 31, 2021. Proceeds from sales of marketable securities were $38.3 million and $34.4 million for the years ended December 31, 2023 and 2022, respectively. There were no sales in marketable securities during the year ended December 31, 2021. Interest earned on marketable securities was $2.0 million and $1.2 million for the years ended December 31, 2023 and 2022, respectively. There was no interest earned on marketable securities during the year ended December 31, 2021. The interest is recorded in other income (expense), net, on the accompanying consolidated statements of operations. As of December 31, 2023 and 2022, the accrued interest receivable, net of allowance for credit losses, was $0.3 million. Accrued interest receivable is recorded in prepaid expenses and other current assets on the accompanying consolidated balance sheets. As of December 31, 2023, the fair value of the 2026 Convertible Notes and 2028 Convertible Notes, as further described in Note 8, “Debt,” to these consolidated financial statements, was approximately $145.5 million and $157.6 million, respectively. As of December 31, 2022, the fair value of the 2026 Convertible Notes and the 2028 Convertible Notes was approximately $180.9 million and $156.5 million, respectively. The fair value was determined based on the closing price for the Convertible Notes on the last trading day of the reporting period and is considered as Level 2 in the fair value hierarchy. As of the years ended December 31, 2023 and 2022, the fair value of the Pension Plan’s assets, as further described in Note 13, “Employee Benefit Plans,” to these consolidated financial statements, was approximately $3.6 million and $3.2 million, respectively. The fair value was determined by an independent actuary and is considered as Level 2 in the fair value hierarchy. The Company monitors the availability of observable market data to assess the appropriate classification of financial instruments within the fair value hierarchy. Changes in economic conditions or model-based valuation techniques may require the transfer of financial instruments from one fair value level to another. In such instances, the transfer is reported at the beginning of the reporting period. There were no transfers between Levels 1, 2 or 3 during the years ended December 31, 2023 and 2022. The money market account is included in cash and cash equivalents in the consolidated balance sheets as of December 31, 2023 and 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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