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Marketable Securities Marketable Securities Table (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities, Current | $ 39,788 | $ 39,302 | $ 34,271
Certificates of Deposit [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities, Current | $ 39,788 | $ 39,302 |

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