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Investments - Schedule of Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Available-for-sale securities: |  |
Amortized Cost | $ 406,600 |
Estimated Fair Value | 407,344 |
Held-to-maturity securities: |  |
Estimated Fair Value | 3,692 |
Long-term Investments |  |
Amortized Cost | 131,166 | $ 24,805
Gross Unrealized Losses, Less than One Year | (134) | (25)
Total long-term investments | 131,032 | 24,780
Total investments |  |
Amortized Cost | 410,087 | 385,766
Gross Unrealized Gains | 1,104 | 2,097
Gross Unrealized Losses, Less than One Year | (155) | (40)
Allowance for Credit Losses |  | (977)
Estimated Fair Value | 411,036 | 386,846
Short-term Investments |  |
Amortized Cost | 278,921 | 360,961
Gross Unrealized Gains | 1,104 | 2,097
Gross Unrealized Losses, Less than One Year | (21) | (15)
Allowance for Credit Losses |  | (977)
Total short-term investments | 280,004 | 362,066
Short-term investments |  |
Available-for-sale securities: |  |
Amortized Cost | 277,254 | 359,294
Gross Unrealized Gains | 899 | 1,910
Gross Unrealized Losses, Less than One Year | (21) | (15)
Allowance for Credit Losses |  | (977)
Estimated Fair Value | 278,132 | 360,212
Short-term investments | Corporate debt securities |  |
Available-for-sale securities: |  |
Amortized Cost | 136,404 | 176,937
Gross Unrealized Gains | 570 | 1,105
Gross Unrealized Losses, Less than One Year | (16) | (7)
Allowance for Credit Losses |  | (977)
Estimated Fair Value | 136,958 | 177,058
Short-term investments | U.S. government and agency debt securities |  |
Available-for-sale securities: |  |
Amortized Cost | 67,868 | 103,011
Gross Unrealized Gains | 139 | 336
Gross Unrealized Losses, Less than One Year |  | (2)
Estimated Fair Value | 68,007 | 103,345
Short-term investments | International government agency debt securities |  |
Available-for-sale securities: |  |
Amortized Cost | 72,982 | 79,346
Gross Unrealized Gains | 190 | 469
Gross Unrealized Losses, Less than One Year | (5) | (6)
Estimated Fair Value | 73,167 | 79,809
Short-term investments | Fixed Term Deposit Account |  |
Held-to-maturity securities: |  |
Amortized Cost | 1,667 | 1,667
Gross Unrealized Gains | 205 | 187
Estimated Fair Value | 1,872 | 1,854
Long-term investments |  |
Available-for-sale securities: |  |
Amortized Cost | 129,346 | 22,985
Gross Unrealized Losses, Less than One Year | (134) | (25)
Estimated Fair Value | 129,212 | 22,960
Long-term investments | Certificates of deposit |  |
Held-to-maturity securities: |  |
Amortized Cost | 1,820 | 1,820
Estimated Fair Value | 1,820 | 1,820
Long-term investments | Corporate debt securities |  |
Available-for-sale securities: |  |
Amortized Cost | 52,638 | 7,908
Gross Unrealized Losses, Less than One Year | (46) | (10)
Estimated Fair Value | 52,592 | 7,898
Long-term investments | U.S. government and agency debt securities |  |
Available-for-sale securities: |  |
Amortized Cost | 45,831 |
Gross Unrealized Losses, Less than One Year | (42) |
Estimated Fair Value | 45,789 |
Long-term investments | International government agency debt securities |  |
Available-for-sale securities: |  |
Amortized Cost | 30,877 | 15,077
Gross Unrealized Losses, Less than One Year | (46) | (15)
Estimated Fair Value | $ 30,831 | $ 15,062

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