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Long-term Debt - Convertible Notes 2020 (Details) - 2020 Convertible Notes Member - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |
Gross proceeds from issuance | $ 2.0 |  |  |  |
Interest rate | 6.00% |  |  |  |
Minimum gross proceeds from sale of preferred stock required for conversion | $ 2.0 |  |  |  |
Conversion price as percentage of the price per share paid by the other investors |  |  |  |  | 80.00%
Embedded derivative fair value |  |  |  |  | $ 1.0
Initial carrying value |  |  |  |  | $ 3.0
Total interest incurred |  | $ 0.0 | $ 0.1 |  |
Series B-1 Preferred Stock |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Minimum gross proceeds from sale of preferred stock required for conversion |  |  |  | $ 10.0 |

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