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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2023
Fair Value Disclosures [Abstract] |
Schedule of cash equivalents, restricted cash and marketable securities by security type | Cash equivalents, restricted cash and marketable securities by security type at December 31, 2023 were as follows:
|  |  |  |  | Gross |  |  | Gross |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
(In thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Included in cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 16,815 |  |  | $ | — |  |  | $ | — |  |  | $ | 16,815 |
|  | $ | 16,815 |  |  | $ | — |  |  | $ | — |  |  | $ | 16,815 |
Restricted cash: |  |  |  |  |  |  |  |  |  |  |  |
Money market fund |  | $ | 843 |  |  | $ | — |  |  | $ | — |  |  | $ | 843 |
Certificate of deposit |  |  | 272 |  |  |  | — |  |  |  | — |  |  |  | 272 |
|  | $ | 1,115 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,115 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities (due in less than one year) |  | $ | 26,752 |  |  | $ | 95 |  |  | $ | — |  |  | $ | 26,847 |
U.S. Treasury securities (due in one to two years) |  |  | 2,877 |  |  |  | 17 |  |  | $ | — |  |  |  | 2,894 |
Government-sponsored enterprise securities (due in less than one year) |  |  | 86,250 |  |  |  | 43 |  |  |  | (92 | ) |  |  | 86,201 |
Government-sponsored enterprise securities (due in one to two years) |  |  | 13,598 |  |  |  | 72 |  |  |  | — |  |  |  | 13,670 |
Commercial paper (due in less than one year) |  |  | 102,270 |  |  |  | 31 |  |  |  | (33 | ) |  |  | 102,268 |
Corporate notes (due in less than one year) |  |  | 48,409 |  |  |  | 14 |  |  |  | (63 | ) |  |  | 48,360 |
Corporate notes (due in one to two years) |  |  | 26,628 |  |  |  | 130 |  |  |  | (24 | ) |  |  | 26,734 |
|  | $ | 306,784 |  |  | $ | 402 |  |  | $ | (212 | ) |  | $ | 306,974 |
Cash equivalents, restricted cash and marketable securities by security type at December 31, 2022 were as follows:
|  |  |  |  | Gross |  |  | Gross |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
(In thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Included in cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 39,771 |  |  | $ | — |  |  | $ | — |  |  | $ | 39,771 |
|  | $ | 39,771 |  |  | $ | — |  |  | $ | — |  |  | $ | 39,771 |
Restricted cash: |  |  |  |  |  |  |  |  |  |  |  |
Money market fund |  | $ | 93 |  |  | $ | — |  |  | $ | — |  |  | $ | 93 |
Certificate of deposit |  |  | 271 |  |  |  | — |  |  |  | — |  |  |  | 271 |
|  | $ | 364 |  |  | $ | — |  |  | $ | — |  |  | $ | 364 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities (due in less than one year) |  | $ | 12,983 |  |  | $ | — |  |  | $ | (62 | ) |  | $ | 12,921 |
Municipal securities (due in one to two years) |  |  | 3,000 |  |  |  | — |  |  |  | (24 | ) |  |  | 2,976 |
Government-sponsored enterprise securities (due in less than one year) |  |  | 9,860 |  |  |  | — |  |  |  | (14 | ) |  |  | 9,846 |
Commercial paper (due in less than one year) |  |  | 64,285 |  |  |  | 6 |  |  |  | (92 | ) |  |  | 64,199 |
Corporate notes (due in less than one year) |  |  | 26,014 |  |  |  | — |  |  |  | (55 | ) |  |  | 25,959 |
|  | $ | 116,142 |  |  | $ | 6 |  |  | $ | (247 | ) |  | $ | 115,901 |
Schedule of cash equivalents and marketable securities with unrealized losses | Cash equivalents and marketable securities with unrealized losses that have been in a continuous unrealized loss position for less than 12 months and 12 months or longer at December 31, 2023 and 2022 were as follows:
|  | Less Than 12 Months |  |  | 12 Months or Greater |  |  | Total |
|  |  |  |  | Gross |  |  |  |  |  | Gross |  |  |  |  |  | Gross |
|  | Estimated |  |  | Unrealized |  |  | Estimated |  |  | Unrealized |  |  | Estimated |  |  | Unrealized |
(In thousands) |  | Fair Value |  |  | Losses |  |  | Fair Value |  |  | Losses |  |  | Fair Value |  |  | Losses |
As of December 31, 2023: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government-sponsored enterprise securities (due in less than one year) |  | $ | 69,377 |  |  | $ | (92 | ) |  | $ | — |  |  | $ | — |  |  | $ | 69,377 |  |  | $ | (92 | )
Commercial paper (due in less than one year) |  |  | 58,622 |  |  |  | (33 | ) |  |  | — |  |  |  | — |  |  |  | 58,622 |  |  |  | (33 | )
Corporate notes (due in less than one year) |  |  | 34,567 |  |  |  | (63 | ) |  |  | — |  |  |  | — |  |  |  | 34,567 |  |  |  | (63 | )
Corporate notes (due in one to two years) |  |  | 3,952 |  |  |  | (23 | ) |  |  | — |  |  |  | — |  |  |  | 3,952 |  |  |  | (23 | )
|  | $ | 166,518 |  |  | $ | (211 | ) |  | $ | — |  |  | $ | — |  |  | $ | 166,518 |  |  | $ | (211 | )
As of December 31, 2022: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities (due in less than one year) |  | $ | 11,424 |  |  | $ | (57 | ) |  | $ | 1,497 |  |  | $ | (5 | ) |  | $ | 12,921 |  |  | $ | (62 | )
Municipal securities (due in less than a year) |  |  | — |  |  |  | — |  |  |  | 2,976 |  |  |  | (24 | ) |  |  | 2,976 |  |  |  | (24 | )
Government-sponsored enterprise securities (due in less than one year) |  |  | 9,845 |  |  |  | (14 | ) |  |  | — |  |  |  | — |  |  |  | 9,845 |  |  |  | (14 | )
Commercial paper (due in less than one year) |  |  | 52,454 |  |  |  | (92 | ) |  |  | — |  |  |  | — |  |  |  | 52,454 |  |  |  | (92 | )
Corporate notes (due in less than one year) |  |  | 1,998 |  |  |  | (2 | ) |  |  | 23,962 |  |  |  | (53 | ) |  |  | 25,960 |  |  |  | (55 | )
|  | $ | 75,721 |  |  | $ | (165 | ) |  | $ | 28,435 |  |  | $ | (82 | ) |  | $ | 104,156 |  |  | $ | (247 | )
Schedule of financial instruments measured at fair value on recurring basis | The following table presents information about our financial instruments that are measured at fair value on a recurring basis as of December 31, 2023 and 2022 and indicates the fair value category assigned.
|  | Fair Value Measurements at Reporting Date Using |
|  | Quoted Prices in |  |  |  |  |  | Significant |  |  |  |
|  | Active Markets for |  |  | Significant Other |  |  | Unobservable |  |  |  |
|  | Identical Assets |  |  | Observable Inputs |  |  | Inputs |  |  |  |
(In thousands) |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
As of December 31, 2023: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds(1)(2) |  | $ | 17,658 |  |  | $ | — |  |  | $ | — |  |  | $ | 17,658 |
Certificate of deposit(2) |  |  | 272 |  |  |  | — |  |  |  | — |  |  |  | 272 |
U.S. Treasury securities(3)(4) |  |  | — |  |  |  | 29,742 |  |  |  | — |  |  |  | 29,742 |
Government-sponsored enterprise securities(3)(4) |  |  | — |  |  |  | 99,872 |  |  |  | — |  |  |  | 99,872 |
Commercial paper(3) |  |  | — |  |  |  | 102,268 |  |  |  | — |  |  |  | 102,268 |
Corporate notes(3)(4) |  |  | — |  |  |  | 75,092 |  |  |  | — |  |  |  | 75,092 |
Total |  | $ | 17,930 |  |  | $ | 306,974 |  |  | $ | — |  |  | $ | 324,904 |
As of December 31, 2022: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds(1)(2) |  | $ | 39,864 |  |  | $ | — |  |  | $ | — |  |  | $ | 39,864 |
Certificate of deposit(2) |  |  | 271 |  |  |  | — |  |  |  | — |  |  |  | 271 |
U.S. Treasury securities(3) |  |  | — |  |  |  | 12,921 |  |  |  | — |  |  |  | 12,921 |
Municipal securities(3) |  |  | — |  |  |  | 2,976 |  |  |  | — |  |  |  | 2,976 |
Government-sponsored enterprise securities(3) |  |  | — |  |  |  | 9,846 |  |  |  | — |  |  |  | 9,846 |
Commercial paper(3) |  |  | — |  |  |  | 64,199 |  |  |  | — |  |  |  | 64,199 |
Corporate notes(3) |  |  | — |  |  |  | 25,959 |  |  |  | — |  |  |  | 25,959 |
Total |  | $ | 40,135 |  |  | $ | 115,901 |  |  | $ | — |  |  | $ | 156,036 |
(1) Included in cash and cash equivalents on our consolidated balance sheets. (2) Included in restricted cash on our consolidated balance sheets. (3) Included in current portion of marketable securities on our consolidated balance sheets. (4) Included in noncurrent portion of marketable securities on our consolidated balance sheets.

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