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Capital Stock - Series X Convertible Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Mar. 31, 2022 | Dec. 31, 2021
Sale of stock |  |  |
Preferred stock, shares authorized (in shares) |  | 1,000,000 | 1,000,000
Series X Convertible Preferred Stock |  |  |
Sale of stock |  |  |
Shares issued (in shares) | 5,003 |  |
Preferred stock, shares authorized (in shares) |  | 5,003 | 5,003
Preferred stock, shares issued (in shares) |  | 5,003 | 5,003
Number of shares issued for each share of convertible preferred stock that is converted | 1,000 |  |
Preferred stock conversion price per share | $ 4.03 |  |
Fair value of common stock amount exceeded purchase price of convertible preferred stock | $ 5.6 |  |

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