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Investments (Tables) | 6 Months Ended
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Jun. 30, 2021
Investments Debt And Equity Securities [Abstract] |
Schedule of Investments | Investments consisted of the following (in thousands):
|  |  |  |  |  | Gross Unrealized |  |  |  |  |  |  |  |  |
|  |  |  |  |  |  |  |  |  | Losses |  |  |  |  |  |  |  |  |
|  | Amortized |  |  |  |  |  |  | Less than |  |  | Greater than |  |  | Allowance for |  |  | Estimated |
June 30, 2021 |  | Cost |  |  | Gains |  |  | One Year |  |  | One Year |  |  | Credit Losses |  |  | Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | 136,404 |  |  | $ | 570 |  |  | $ | (16 | ) |  | $ | — |  |  | $ | — |  |  | $ | 136,958 |
International government agency debt securities |  |  | 72,982 |  |  |  | 190 |  |  |  | (5 | ) |  |  | — |  |  |  | — |  |  |  | 73,167 |
U.S. government and agency debt securities |  |  | 67,868 |  |  |  | 139 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 68,007 |
|  |  | 277,254 |  |  |  | 899 |  |  |  | (21 | ) |  |  | — |  |  |  | — |  |  |  | 278,132 |
Held-to-maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed term deposit account |  |  | 1,667 |  |  |  | 205 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,872 |
Total short-term investments |  |  | 278,921 |  |  |  | 1,104 |  |  |  | (21 | ) |  |  | — |  |  |  | — |  |  |  | 280,004 |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  |  | 52,638 |  |  |  | — |  |  |  | (46 | ) |  |  | — |  |  |  | — |  |  |  | 52,592 |
International government agency debt securities |  |  | 30,877 |  |  |  | — |  |  |  | (46 | ) |  |  | — |  |  |  | — |  |  |  | 30,831 |
U.S. government and agency debt securities |  |  | 45,831 |  |  |  | — |  |  |  | (42 | ) |  |  | — |  |  |  | — |  |  |  | 45,789 |
|  |  | 129,346 |  |  |  | — |  |  |  | (134 | ) |  |  | — |  |  |  | — |  |  |  | 129,212 |
Held-to-maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | 1,820 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,820 |
Total long-term investments |  |  | 131,166 |  |  |  | — |  |  |  | (134 | ) |  |  | — |  |  |  | — |  |  |  | 131,032 |
Total investments |  | $ | 410,087 |  |  | $ | 1,104 |  |  | $ | (155 | ) |  | $ | — |  |  | $ | — |  |  | $ | 411,036 |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | 176,937 |  |  | $ | 1,105 |  |  | $ | (7 | ) |  | $ | — |  |  | $ | (977 | ) |  | $ | 177,058 |
U.S. government and agency debt securities |  |  | 103,011 |  |  |  | 336 |  |  |  | (2 | ) |  |  | — |  |  |  | — |  |  |  | 103,345 |
International government agency debt securities |  |  | 79,346 |  |  |  | 469 |  |  |  | (6 | ) |  |  | — |  |  |  | — |  |  |  | 79,809 |
|  |  | 359,294 |  |  |  | 1,910 |  |  |  | (15 | ) |  |  | — |  |  |  | (977 | ) |  |  | 360,212 |
Held-to-maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed term deposit account |  |  | 1,667 |  |  |  | 187 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,854 |
Total short-term investments |  |  | 360,961 |  |  |  | 2,097 |  |  |  | (15 | ) |  |  | — |  |  |  | (977 | ) |  |  | 362,066 |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  |  | 7,908 |  |  |  | — |  |  |  | (10 | ) |  |  | — |  |  |  | — |  |  |  | 7,898 |
International government agency debt securities |  |  | 15,077 |  |  |  | — |  |  |  | (15 | ) |  |  | — |  |  |  | — |  |  |  | 15,062 |
|  |  | 22,985 |  |  |  | — |  |  |  | (25 | ) |  |  | — |  |  |  | — |  |  |  | 22,960 |
Held-to-maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | 1,820 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,820 |
Total long-term investments |  |  | 24,805 |  |  |  | — |  |  |  | (25 | ) |  |  | — |  |  |  | — |  |  |  | 24,780 |
Total investments |  | $ | 385,766 |  |  | $ | 2,097 |  |  | $ | (40 | ) |  | $ | — |  |  | $ | (977 | ) |  | $ | 386,846 |
Schedule of Proceeds from Sales and Maturities of Marketable Securities Plus Resulting Realized Gains and Losses | The proceeds from sales and maturities of marketable securities, which were identified using the specific identification method and were primarily reinvested, were as follows:
|  | Six Months Ended June 30, |
(In thousands) |  | 2021 |  |  | 2020 |
Proceeds from the sales and maturities of marketable securities |  | $ | 175,499 |  |  | $ | 147,859 |
Realized gains |  | $ | — |  |  | $ | 51 |
Realized losses |  | $ | 977 |  |  | $ | — |
Schedule of Contractual Maturities of Available-for-Sale and Held-to-Maturity Securities | The Company’s available-for-sale and held-to-maturity securities at June 30, 2021 had contractual maturities in the following periods:
|  | Available-for-sale |  |  | Held-to-maturity |
|  | Amortized |  |  | Estimated |  |  | Amortized |  |  | Estimated |
(In thousands) |  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
Within 1 year |  | $ | 194,815 |  |  | $ | 195,149 |  |  | $ | 3,487 |  |  | $ | 3,692 |
After 1 year through 5 years |  |  | 211,785 |  |  |  | 212,195 |  |  |  | — |  |  |  | — |
Total |  | $ | 406,600 |  |  | $ | 407,344 |  |  | $ | 3,487 |  |  | $ | 3,692 |

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