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Investments - Schedule of Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-sale securities: |  |
Short-term investments, Amortized Cost | $ 341,502 | $ 315,767
Gross Unrealized Gains | 229 | 1,461
Gross Unrealized Losses less than one year | (364) | (78)
Gross Unrealized Losses greater than one year | (804) | (1,759)
Short-term investments, Estimated Fair Value | 340,967 | 316,022
Long-term investments, Amortized Cost | 86,661 | 38,698
Total long-term investments | 86,402 | 39,887
Long-term investments, Estimated Fair Value | 86,257 | 38,067
Amortized Cost | 428,308 | 356,285
Estimated Fair Value | 427,369 | 355,909
Short-term investments |  |
Available-for-sale securities: |  |
Gross Unrealized Gains | 229 | 1,461
Gross Unrealized Losses less than one year | (121) | (51)
Gross Unrealized Losses greater than one year | (643) | (1,155)
Long-term investments |  |
Available-for-sale securities: |  |
Gross Unrealized Losses less than one year | (243) | (27)
Gross Unrealized Losses greater than one year | (161) | (604)
Total long-term investments | 86,402 | 39,887
Amortized Cost | 86,806 | 40,518
Certificates of deposit |  |
Available-for-sale securities: |  |
Amortized Cost | 145 | 1,820
Estimated Fair Value | 145 | 1,820
Corporate debt securities |  |
Available-for-sale securities: |  |
Short-term investments, Amortized Cost | 126,865 | 112,055
Short-term investments, Estimated Fair Value | 126,642 | 112,207
Long-term investments, Amortized Cost | 43,853 | 19,306
Long-term investments, Estimated Fair Value | 43,655 | 19,017
Corporate debt securities | Short-term investments |  |
Available-for-sale securities: |  |
Gross Unrealized Gains | 132 | 703
Gross Unrealized Losses less than one year | (52) | (15)
Gross Unrealized Losses greater than one year | (303) | (536)
Corporate debt securities | Long-term investments |  |
Available-for-sale securities: |  |
Gross Unrealized Losses less than one year | (136) |
Gross Unrealized Losses greater than one year | (62) | (289)
U.S. government and agency debt securities |  |
Available-for-sale securities: |  |
Short-term investments, Amortized Cost | 214,637 | 199,708
Short-term investments, Estimated Fair Value | 214,325 | 199,819
Long-term investments, Amortized Cost | 42,808 | 19,392
Long-term investments, Estimated Fair Value | 42,602 | 19,050
U.S. government and agency debt securities | Short-term investments |  |
Available-for-sale securities: |  |
Gross Unrealized Gains | 97 | 758
Gross Unrealized Losses less than one year | (69) | (36)
Gross Unrealized Losses greater than one year | (340) | (611)
U.S. government and agency debt securities | Long-term investments |  |
Available-for-sale securities: |  |
Gross Unrealized Losses less than one year | (107) | (27)
Gross Unrealized Losses greater than one year | $ (99) | (315)
Non-U.S. government debt securities |  |
Available-for-sale securities: |  |
Short-term investments, Amortized Cost |  | 4,004
Short-term investments, Estimated Fair Value |  | 3,996
Non-U.S. government debt securities | Short-term investments |  |
Available-for-sale securities: |  |
Gross Unrealized Losses greater than one year |  | $ (8)

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