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Fair Value Measurements | 9 Months Ended
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Sep. 30, 2023
Fair Value Disclosures [Abstract] |
Fair Value Measurements | 3. Fair Value Measurements The Company uses a three-tier fair value hierarchy to classify and disclose all assets and liabilities measured at fair value on a recurring basis, as well as assets and liabilities measured at fair value on a non-recurring basis, in periods subsequent to their initial measurement. The hierarchy requires use of observable inputs when available, and to minimize the use of unobservable inputs when determining fair value. The three tiers are defined as follows: •Level 1. Observable inputs based on unadjusted quoted prices in active markets for identical assets or liabilities; •Level 2. Inputs, other than quoted prices in active markets, that are observable either directly or indirectly; and •Level 3. Unobservable inputs for which there is little or no market data, which requires the Company to develop its own assumptions. A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The carrying amounts of cash and cash equivalents, accounts receivable, accounts payable and accrued expenses approximate fair value as of September 30, 2023 and December 31, 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 September 30, 2023 and December 31, 2022:
| Amortized cost or carrying value |  | Unrealized gains |  | Unrealized losses |  | Fair value measurements on a recurring basis September 30, 2023
Level 1 |  | Level 2 |  | Level 3 |  | Total
| (In thousands)
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market account | $ | 67,168 |  |  | $ | — |  |  | $ | — |  |  | $ | 67,168 |  |  | $ | — |  |  | $ | — |  |  | $ | 67,168 |
Commercial paper | 5,470 |  |  | — |  |  | — |  |  | 5,470 |  |  | — |  |  | — |  |  | 5,470 |
Total included in cash and cash equivalents | 72,638 |  |  | — |  |  | — |  |  | 72,638 |  |  | — |  |  | — |  |  | 72,638 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits | 20,000 |  |  | — |  |  | — |  |  | 20,000 |  |  | — |  |  | — |  |  | 20,000 |
Corporate debt securities | 265 |  |  | 1 |  |  | — |  |  | — |  |  | 266 |  |  | — |  |  | 266 |
Commercial paper | 11,169 |  |  | 310 |  |  | — |  |  | 11,479 |  |  | — |  |  | — |  |  | 11,479 |
Total marketable securities | 31,434 |  |  | 311 |  |  | — |  |  | 31,479 |  |  | 266 |  |  | — |  |  | 31,745 |
Total financial assets | $ | 104,072 |  |  | $ | 311 |  |  | $ | — |  |  | $ | 104,117 |  |  | $ | 266 |  |  | $ | — |  |  | $ | 104,383 |
| 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 September 30, 2023:
| Amortized cost |  | Aggregate fair value
| (In thousands)
Financial assets: |  |  |
Less than one year | $ | 31,434 |  |  | $ | 31,745 |
Total | $ | 31,434 |  |  | $ | 31,745 |
As of September 30, 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 September 30, 2023, the Company anticipates that it will recover the entire amortized cost basis of its marketable securities before maturity. During the three and nine months ended September 30, 2023, there were $18.9 million and $61.8 million in maturities of marketable securities, respectively. There were no proceeds from sales of marketable securities for the three months ended September 30, 2023 and $38.3 million for the nine months ended September 30, 2023. There were $33.1 million in maturities from marketable securities for the three and nine months ended September 30, 2022. The Company determines realized gains and losses on sale of marketable securities using the specific identification method and records such gains and losses in other income (expense), net on the condensed consolidated statements of operations. Interest earned on marketable securities was $0.6 million and $1.4 million for the three and nine months ended September 30, 2023, respectively, and $0.4 million and $0.6 million for the three and nine months ended September 30, 2022, respectively. The interest is recorded in other income (expense), net, on the accompanying condensed consolidated statements of operations. As of September 30, 2023, the fair value of the 2026 Convertible Notes and 2028 Convertible Notes, as further described in Note 8, “Debt,” to these condensed consolidated financial statements, was approximately $137.7 million and $162.5 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.

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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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