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Investments - Schedule of Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Available-for-sale securities: |  |
Short-term investments, Amortized Cost | $ 243,623 | $ 320,583
Short-term investments, Gross Unrealized Gains | 19 | 16
Short-term investments, Gross Unrealized Losses, Less than One Year | (51) | (718)
Short-term investments, Gross Unrealized Losses, Greater than One Year | (2,152) | (3,889)
Short-term investments, Estimated Fair Value | 241,439 | 315,992
Long-term investments, Amortized Cost | 106,158 | 134,548
Long-term investments, Gross Unrealized Losses, Less than One Year | (203) | (2,467)
Long-term investments, Gross Unrealized Losses, Greater than One Year | (1,344) | (2,291)
Long-term investments, Estimated Fair Value | 104,611 | 129,790
Held-to-maturity securities: |  |
Long Term Investment Securities Continuous Unrealized Loss Position More Than12 Months Aggregate Losses | 1,344 | 2,291
Estimated Fair Value | 1,820 |
Long-term Investments |  |
Amortized Cost | 107,978 | 136,368
Gross Unrealized Losses, Less than One Year | (203) | (2,467)
Gross Unrealized Losses, Greater than One Year | (1,344) | (2,291)
Total long-term investments | 106,431 | 131,610
Total investments |  |
Amortized Cost | 351,601 | 456,951
Gross Unrealized Gains | 19 | 16
Gross Unrealized Losses, Less than One Year | (254) | (3,185)
Gross Unrealized Losses, Greater than One Year | (3,496) | (6,180)
Estimated Fair Value | 347,870 | 447,602
Certificates of deposit |  |
Held-to-maturity securities: |  |
Amortized Cost | 1,820 | 1,820
Estimated Fair Value | 1,820 | 1,820
Corporate debt securities |  |
Available-for-sale securities: |  |
Short-term investments, Amortized Cost | 94,150 | 141,418
Short-term investments, Gross Unrealized Gains | 12 |
Short-term investments, Gross Unrealized Losses, Less than One Year | (32) | (424)
Short-term investments, Gross Unrealized Losses, Greater than One Year | (1,068) | (2,054)
Short-term investments, Estimated Fair Value | 93,062 | 138,940
Long-term investments, Amortized Cost | 38,179 | 68,229
Long-term investments, Gross Unrealized Losses, Less than One Year | (44) | (1,550)
Long-term investments, Gross Unrealized Losses, Greater than One Year | (606) | (676)
Long-term investments, Estimated Fair Value | 37,529 | 66,003
U.S. government and agency debt securities |  |
Available-for-sale securities: |  |
Short-term investments, Amortized Cost | 137,689 | 143,710
Short-term investments, Gross Unrealized Gains | 7 | 16
Short-term investments, Gross Unrealized Losses, Less than One Year | (19) | (266)
Short-term investments, Gross Unrealized Losses, Greater than One Year | (985) | (1,289)
Short-term investments, Estimated Fair Value | 136,692 | 142,171
Long-term investments, Amortized Cost | 67,979 | 62,220
Long-term investments, Gross Unrealized Losses, Less than One Year | (159) | (917)
Long-term investments, Gross Unrealized Losses, Greater than One Year | (738) | (1,424)
Long-term investments, Estimated Fair Value | 67,082 | 59,879
Non-U.S. government debt securities |  |
Available-for-sale securities: |  |
Short-term investments, Amortized Cost | 11,784 | 35,455
Short-term investments, Gross Unrealized Losses, Less than One Year |  | (28)
Short-term investments, Gross Unrealized Losses, Greater than One Year | (99) | (546)
Short-term investments, Estimated Fair Value | $ 11,685 | 34,881
Long-term investments, Amortized Cost |  | 4,099
Long-term investments, Gross Unrealized Losses, Greater than One Year |  | (191)
Long-term investments, Estimated Fair Value |  | $ 3,908

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