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Cash, Cash Equivalents and Short-Term Investments - Company's gross unrealized losses and fair value (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Cash, Cash Equivalents and Short-Term Investments |  |  |  |
Less than 12 Months, Fair Value | $ 15,604 |  | $ 15,604 |
12 Months or more, Fair Value | 293,263 |  | 293,263 |
Total, Fair Value | 308,867 |  | 308,867 |
Less than 12 Months, Unrealized Losses | (32) |  | (32) |
12 Months or more, Unrealized Losses | (470) |  | (470) |
Total, Unrealized Losses | (502) |  | (502) |
Realized losses on available-for-sale investments | 10 | $ (30) | (60) | $ (100)
U.S. Treasury notes |  |  |  |
Cash, Cash Equivalents and Short-Term Investments |  |  |  |
Less than 12 Months, Fair Value | 1,947 |  | 1,947 |
12 Months or more, Fair Value | 127,984 |  | 127,984 |
Total, Fair Value | 129,931 |  | 129,931 |
Less than 12 Months, Unrealized Losses | (19) |  | (19) |
12 Months or more, Unrealized Losses | (59) |  | (59) |
Total, Unrealized Losses | (78) |  | (78) |
Corporate debt securities |  |  |  |
Cash, Cash Equivalents and Short-Term Investments |  |  |  |
Less than 12 Months, Fair Value | 13,657 |  | 13,657 |
12 Months or more, Fair Value | 165,279 |  | 165,279 |
Total, Fair Value | 178,936 |  | 178,936 |
Less than 12 Months, Unrealized Losses | (13) |  | (13) |
12 Months or more, Unrealized Losses | (411) |  | (411) |
Total, Unrealized Losses | $ (424) |  | $ (424) |

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- Definition It represents the amount of aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References No definition available. + Details
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