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CASH EQUIVALENTS AND MARKETABLE SECURITIES | 12 Months Ended
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Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |
CASH EQUIVALENTS AND MARKETABLE SECURITIES | CASH EQUIVALENTS AND MARKETABLE SECURITIES The table below summarizes the Company’s cash equivalents and marketable securities (in thousands):
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
December 31, 2023 |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 2,508 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,508 |
Total | 2,508 |  |  | — |  |  | — |  |  | 2,508 |
Marketable securities: |  |  |  |  |  |  |
U.S. government-sponsored entity debt securities | 22,347 |  |  | 219 |  |  | — |  |  | 22,566 |
Commercial paper securities | 2,825 |  |  | 2 |  |  | (1) |  |  | 2,826 |
Corporate debt securities | 1,399 |  |  | 6 |  |  | — |  |  | 1,405 |
Asset-backed securities | 2,368 |  |  | 9 |  |  | — |  |  | 2,377 |
U.S. treasury bills | 5,599 |  |  | — |  |  | (6) |  |  | 5,593 |
Certificates of deposit | 1,026 |  |  | 5 |  |  | — |  |  | 1,031 |
Total | 35,564 |  |  | 241 |  |  | (7) |  |  | 35,798 |
Total cash equivalents and marketable securities | $ | 38,072 |  |  | $ | 241 |  |  | $ | (7) |  |  | $ | 38,306 |
December 31, 2022 |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 50,820 |  |  | $ | — |  |  | $ | — |  |  | $ | 50,820 |
Total | 50,820 |  |  | — |  |  | — |  |  | 50,820 |
Marketable securities: |  |  |  |  |  |  |
U.S. government-sponsored entity debt securities | 18,710 |  |  | — |  |  | (293) |  |  | 18,417 |
Commercial paper securities | 101,336 |  |  | 22 |  |  | (193) |  |  | 101,165 |
Corporate debt securities | 11,760 |  |  | — |  |  | (90) |  |  | 11,670 |
Asset-backed securities | 24,970 |  |  | 2 |  |  | (180) |  |  | 24,792 |
U.S. treasury bills | 7,950 |  |  | — |  |  | (12) |  |  | 7,938 |
Certificates of deposit | 37,599 |  |  | 4 |  |  | (142) |  |  | 37,461 |
Agency bonds | 5,598 |  |  | — |  |  | (8) |  |  | 5,590 |
Total | 207,923 |  |  | 28 |  |  | (918) |  |  | 207,033 |
Total cash equivalents and marketable securities | $ | 258,743 |  |  | $ | 28 |  |  | $ | (918) |  |  | $ | 257,853 |
The fair value of marketable securities by contractual maturity were as follows (in thousands):
| December 31,
| 2023 |  | 2022
Maturing in one year or less | $ | 10,855 |  |  | $ | 177,188 |
Maturing after one year through five years | 24,943 |  |  | 29,845 |
Total | $ | 35,798 |  |  | $ | 207,033 |
Realized gains and losses on the sales of investments were not material during the years ended December 31, 2023, 2022 and 2021. Total unrealized gains for securities with net gains in AOCI were not material for the year ended December 31, 2023. The Company manages credit risk associated with its investment portfolio through its investment policy, which limits purchases to high-quality issuers and also limits the amount of its portfolio that can be invested in a single issuer. The Company did not record an allowance for credit losses related to its marketable securities for the years ended December 31, 2023, 2022, or 2021. The Company had unrealized losses related to its marketable securities for the years ended December 31, 2023, 2022 and 2021. The Company had no material unrealized losses, individually and in the aggregate, for marketable securities that are in a continuous unrealized loss position for greater than 12 months as of December 31, 2023, 2022 and 2021. These unrealized losses were not attributed to credit risk and were associated with changes in market conditions. The Company periodically reviews its marketable securities for indications of credit losses. The Company considers factors such as the duration, the magnitude and the reason for the decline in value, the potential recovery period, creditworthiness of the issuers of the securities and its intent to sell. No significant facts or circumstances have arisen to indicate that there has been any significant deterioration in the creditworthiness of the issuers of the securities held by the Company. Based on the Company’s review of these securities, the Company determined that no allowance for credit losses related to its marketable securities was required at either December 31, 2023 or 2022. The Company also considers whether it is more likely than not that the Company will be required to sell the debt securities before recovery of their amortized cost basis. Based on the scheduled maturities of its investments and projection of its cash flows in accordance with the current operating plan, the Company determined that it was more likely than not that it will be required to sell various securities before recovery of their amortized cost basis during the year ended December 31, 2023. As a result, the Company had reclassified certain non-current marketable securities investments of $34.4 million as current during the year ended December 31, 2023 and recorded an impairment charge of $0.4 million related to those securities. Realized gains and losses on the subsequent sale of these securities during the year ended December 31, 2023 were not material. No impairment charges were recorded during the year ended December 31, 2022, as the Company concluded at that time it had the ability and intent to hold the long-term investments until maturity.

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