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Fair Value Measurements (Details) - Recurring - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Marketable securities - available for sale | $ 70,323 | $ 18,061
Assets, fair value | 70,323 | 18,061
Level 1 |  |
Assets: |  |
Marketable securities - available for sale | 0 | 0
Assets, fair value | 0 | 0
Level 2 |  |
Assets: |  |
Marketable securities - available for sale | 70,323 | 18,061
Assets, fair value | 70,323 | 18,061
Level 3 |  |
Assets: |  |
Marketable securities - available for sale | 0 | 0
Assets, fair value | $ 0 | $ 0

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