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Investments - Schedule of Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Available-for-sale securities: |  |
Short-term investments, Amortized Cost | $ 165,826 | $ 320,583
Short-term investments, Gross Unrealized Gains | 1 | 16
Short-term investments, Gross Unrealized Losses, Less than One Year | (198) | (718)
Short-term investments, Gross Unrealized Losses, Greater than One Year | (2,375) | (3,889)
Short-term investments, Estimated Fair Value | 163,254 | 315,992
Long-term investments, Amortized Cost | 79,044 | 134,548
Long-term investments, Gross Unrealized Losses, Less than One Year | (992) | (2,467)
Long-term investments, Gross Unrealized Losses, Greater than One Year | (1,745) | (2,291)
Long-term investments, Estimated Fair Value | 76,307 | 129,790
Held-to-maturity securities: |  |
Estimated Fair Value | 1,820 |
Long-term Investments |  |
Amortized Cost | 80,864 | 136,368
Gross Unrealized Losses, Less than One Year | (992) | (2,467)
Gross Unrealized Losses, Greater than One Year | (1,745) | (2,291)
Total long-term investments | 78,127 | 131,610
Total investments |  |
Amortized Cost | 246,690 | 456,951
Gross Unrealized Gains | 1 | 16
Gross Unrealized Losses, Less than One Year | (1,190) | (3,185)
Gross Unrealized Losses, Greater than One Year | (4,120) | (6,180)
Estimated Fair Value | 241,381 | 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 | 77,279 | 141,418
Short-term investments, Gross Unrealized Losses, Less than One Year | (82) | (424)
Short-term investments, Gross Unrealized Losses, Greater than One Year | (1,106) | (2,054)
Short-term investments, Estimated Fair Value | 76,091 | 138,940
Long-term investments, Amortized Cost | 38,825 | 68,229
Long-term investments, Gross Unrealized Losses, Less than One Year | (529) | (1,550)
Long-term investments, Gross Unrealized Losses, Greater than One Year | (765) | (676)
Long-term investments, Estimated Fair Value | 37,531 | 66,003
U.S. government and agency debt securities |  |
Available-for-sale securities: |  |
Short-term investments, Amortized Cost | 73,188 | 143,710
Short-term investments, Gross Unrealized Gains | 1 | 16
Short-term investments, Gross Unrealized Losses, Less than One Year | (116) | (266)
Short-term investments, Gross Unrealized Losses, Greater than One Year | (991) | (1,289)
Short-term investments, Estimated Fair Value | 72,082 | 142,171
Long-term investments, Amortized Cost | 40,219 | 62,220
Long-term investments, Gross Unrealized Losses, Less than One Year | (463) | (917)
Long-term investments, Gross Unrealized Losses, Greater than One Year | (980) | (1,424)
Long-term investments, Estimated Fair Value | 38,776 | 59,879
Non-U.S. government debt securities |  |
Available-for-sale securities: |  |
Short-term investments, Amortized Cost | 15,359 | 35,455
Short-term investments, Gross Unrealized Losses, Less than One Year |  | (28)
Short-term investments, Gross Unrealized Losses, Greater than One Year | (278) | (546)
Short-term investments, Estimated Fair Value | $ 15,081 | 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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