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Marketable Debt and Equity Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Available-for-sale Securities |  |
Cash and cash equivalents | $ 143,480 | $ 163,544
Investments, amortized cost | 579,624 | 594,038
Investments | 578,124 | 594,123
Total amortized cost | 455,732 |
Gross unrealized gains | 1 | 94
Gross unrealized losses | (1,501) | (9)
Marketable Securities | 454,232 |
Marketable securities |  |
Schedule of Available-for-sale Securities |  |
Marketable Securities | 454,232 | 435,186
Money Market Funds |  |
Schedule of Available-for-sale Securities |  |
Cash and cash equivalents | 123,892 | 158,937
Corporate Securities |  |
Schedule of Available-for-sale Securities |  |
Total amortized cost | 144,584 | 119,782
Gross unrealized gains |  | 57
Gross unrealized losses | (166) | (6)
Marketable Securities | 144,418 | 119,833
Government Securities |  |
Schedule of Available-for-sale Securities |  |
Total amortized cost | 311,148 | 315,319
Gross unrealized gains | 1 | 37
Gross unrealized losses | (1,335) | (3)
Marketable Securities | 309,814 | 315,353
Cash and Cash Equivalents |  |
Schedule of Available-for-sale Securities |  |
Cash and cash equivalents | $ 123,892 | $ 158,937

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