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INVESTMENTS IN DEBT SECURITIES (Tables) | 3 Months Ended
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Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract] |
Short-term and Long-term Investments | The Company's short-term and long-term investments as of March 31, 2024 were as follows (in thousands):
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Short-term debt securities: |  |  |  |  |  |  |
U.S. agency securities | $ | 58,399 |  |  | $ | — |  |  | $ | (676) |  |  | $ | 57,723 |
Corporate bonds | 135,097 |  |  | 60 |  |  | (626) |  |  | 134,531 |
Commercial paper | 724 |  |  | — |  |  | — |  |  | 724 |
Municipal securities | 9,391 |  |  | — |  |  | (138) |  |  | 9,253 |
Certificates of deposit | 500 |  |  | — |  |  | — |  |  | 500 |
U.S. government securities | 372,337 |  |  | 43 |  |  | (2,317) |  |  | 370,063 |
Foreign government securities | 600 |  |  | — |  |  | (4) |  |  | 596 |
Total | $ | 577,048 |  |  | $ | 103 |  |  | $ | (3,761) |  |  | $ | 573,390 |
Long-term debt securities: |  |  |  |  |  |  |
Corporate bonds | $ | 96,206 |  |  | $ | 273 |  |  | $ | (95) |  |  | $ | 96,384 |
Municipal securities | 2,481 |  |  | 30 |  |  | (119) |  |  | 2,392 |
U.S. government securities | 89,073 |  |  | 151 |  |  | (78) |  |  | 89,146 |
Total | $ | 187,760 |  |  | $ | 454 |  |  | $ | (292) |  |  | $ | 187,922 |
The Company's short-term and long-term investments as of December 31, 2023 were as follows (in thousands):
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Short-term debt securities: |  |  |  |  |  |  |
U.S. agency securities | $ | 68,778 |  |  | $ | — |  |  | $ | (1,263) |  |  | $ | 67,515 |
Corporate bonds | 216,864 |  |  | 96 |  |  | (1,733) |  |  | 215,227 |
Commercial paper | 15,159 |  |  | — |  |  | — |  |  | 15,159 |
Municipal securities | 9,396 |  |  | — |  |  | (231) |  |  | 9,165 |
Certificates of deposit | 3,856 |  |  | — |  |  | — |  |  | 3,856 |
U.S. government securities | 544,145 |  |  | 210 |  |  | (4,357) |  |  | 539,998 |
Foreign government securities | 1,000 |  |  | — |  |  | (19) |  |  | 981 |
Total | $ | 859,198 |  |  | $ | 306 |  |  | $ | (7,603) |  |  | $ | 851,901 |
Long-term debt securities: |  |  |  |  |  |  |
Corporate bonds | $ | 94,564 |  |  | $ | 809 |  |  | $ | (45) |  |  | $ | 95,328 |
Municipal securities | 2,495 |  |  | 55 |  |  | (138) |  |  | 2,412 |
U.S. government securities | 152,549 |  |  | 875 |  |  | (37) |  |  | 153,387 |
Total | $ | 249,608 |  |  | $ | 1,739 |  |  | $ | (220) |  |  | $ | 251,127 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value | The Company's gross unrealized losses and fair values for those investments that were in an unrealized loss position as of March 31, 2024 and December 31, 2023, aggregated by investment category and the length of time that individual securities have been in a continuous loss position were as follows (in thousands):
| March 31, 2024
| Less than 12 Months |  | Greater than 12 Months |  | Total
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
Short-term debt securities: |  |  |  |  |  |  |  |  |  |  |
U.S. agency securities | $ | 400 |  |  | $ | — |  |  | $ | 57,322 |  |  | $ | (676) |  |  | $ | 57,722 |  |  | $ | (676) |
Corporate bonds | 44,988 |  |  | (48) |  |  | 52,483 |  |  | (578) |  |  | 97,471 |  |  | (626) |
Municipal securities | — |  |  | — |  |  | 9,253 |  |  | (138) |  |  | 9,253 |  |  | (138) |
U.S. government securities | 92,760 |  |  | (78) |  |  | 162,389 |  |  | (2,239) |  |  | 255,149 |  |  | (2,317) |
Foreign government securities | — |  |  | — |  |  | 596 |  |  | (4) |  |  | 596 |  |  | (4) |
Total | $ | 138,148 |  |  | $ | (126) |  |  | $ | 282,043 |  |  | $ | (3,635) |  |  | $ | 420,191 |  |  | $ | (3,761) |
Long-term debt securities: |  |  |  |  |  |  |  |  |  |  |
Corporate bonds | $ | 45,907 |  |  | $ | (87) |  |  | $ | 980 |  |  | $ | (8) |  |  | $ | 46,887 |  |  | $ | (95) |
Municipal securities | 977 |  |  | (13) |  |  | 385 |  |  | (106) |  |  | 1,362 |  |  | (119) |
U.S. government securities | 25,758 |  |  | (78) |  |  | — |  |  | — |  |  | 25,758 |  |  | (78) |
Total | $ | 72,642 |  |  | $ | (178) |  |  | $ | 1,365 |  |  | $ | (114) |  |  | $ | 74,007 |  |  | $ | (292) |
| December 31, 2023
| Less than 12 Months |  | Greater than 12 Months |  | Total
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
Short-term debt securities: |  |  |  |  |  |  |  |  |  |  |
U.S. agency securities | $ | 9,770 |  |  | $ | (10) |  |  | $ | 57,745 |  |  | $ | (1,253) |  |  | $ | 67,515 |  |  | $ | (1,263) |
Corporate bonds | 61,054 |  |  | (60) |  |  | 110,706 |  |  | (1,673) |  |  | 171,760 |  |  | (1,733) |
Municipal securities | — |  |  | — |  |  | 9,165 |  |  | (231) |  |  | 9,165 |  |  | (231) |
U.S. government securities | 80,724 |  |  | (113) |  |  | 207,183 |  |  | (4,243) |  |  | 287,907 |  |  | (4,356) |
Foreign government securities | — |  |  | — |  |  | 981 |  |  | (19) |  |  | 981 |  |  | (19) |
Total | $ | 151,548 |  |  | $ | (183) |  |  | $ | 385,780 |  |  | $ | (7,419) |  |  | $ | 537,328 |  |  | $ | (7,602) |
Long-term debt securities: |  |  |  |  |  |  |  |  |  |  |
Corporate bonds | $ | 11,819 |  |  | $ | (31) |  |  | $ | 2,274 |  |  | $ | (14) |  |  | $ | 14,093 |  |  | $ | (45) |
Municipal securities | 976 |  |  | (24) |  |  | 383 |  |  | (112) |  |  | 1,359 |  |  | (136) |
U.S. government securities | 28,474 |  |  | (37) |  |  | — |  |  | — |  |  | 28,474 |  |  | (37) |
Total | $ | 41,269 |  |  | $ | (92) |  |  | $ | 2,657 |  |  | $ | (126) |  |  | $ | 43,926 |  |  | $ | (218) |
Contractual Maturities of Short-Term and Long-Term Investments | The contractual maturities of the Company's short-term and long-term investments as of March 31, 2024 were as follows (in thousands):
| Amortized Cost |  | Fair Value
Due in one year or less | $ | 577,048 |  |  | $ | 573,390 |
Due in one to five years | 187,760 |  |  | 187,922 |
Total | $ | 764,808 |  |  | $ | 761,312 |

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