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Fair Value of Financial Instruments - Schedule of Fair Value of Company's Financial Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Assets |  |  |  |
Marketable securities | $ 83,769 | $ 73,784 | [1] |
Level 1 | Recurring |  |  |  |
Assets |  |  |  |
Money market fund (cash equivalent) | 124,509 | 26,472 |  |
Money market fund (long-term restricted cash) | 199 | 199 |  | $ 199
Total assets measured at fair value | 124,708 | 26,671 |  | $ 199
Level 2 | Recurring |  |  |  |
Assets |  |  |  |
Marketable securities |  | 73,784 |  |
Total assets measured at fair value | 83,769 | 73,784 |  |
Level 2 | Recurring | Commercial Paper |  |  |  |
Assets |  |  |  |
Marketable securities | 50,904 | 43,969 | [1] |
Level 2 | Recurring | Corporate Debt |  |  |  |
Assets |  |  |  |
Marketable securities | 14,797 | 17,072 | [1] |
Level 2 | Recurring | U.S. Government Agency |  |  |  |
Assets |  |  |  |
Marketable securities | 15,061 | 5,053 | [1] |
Level 2 | Recurring | Asset-Backed Securities |  |  |  |
Assets |  |  |  |
Marketable securities | $ 3,007 | $ 7,690 | [1] |
[1] | These items have been reclassified to conform to current period presentation.

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