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Restricted Cash (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Cash and Cash Equivalents [Abstract] |  |
Schedule of Cash and Cash Equivalents and Restricted Cash | The following table reconciles cash and cash equivalents and restricted cash per the balance sheets to the statements of cash flows (in thousands):
|  | March 31, 2022 |  |  | March 31, 2021 |
Cash and cash equivalents |  | $ | 127,160 |  |  | $ | 117,651 |
Restricted cash |  |  | 199 |  |  |  | 199 |
Total |  | $ | 127,359 |  |  | $ | 117,850 |
| The following table reconciles cash and cash equivalents and restricted cash per the balance sheets to the statements of cash flows (in thousands):
|  | December 31, |
|  | 2021 |  |  | 2020 |
Cash and cash equivalents |  | $ | 30,833 |  |  | $ | 46,596 |
Restricted cash |  |  | 199 |  |  |  | 199 |
Total |  | $ | 31,032 |  |  | $ | 46,795 |

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