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Capital Stock - Series X Convertible Preferred Stock (Details) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2022 | Dec. 31, 2021
Sale of stock |  |  |  |
Preferred stock, shares authorized (in shares) |  |  | 1,000,000 | 1,000,000
Series X And Series Y Convertible Preferred Stock |  |  |  |
Sale of stock |  |  |  |
Number of shares issued for each share of convertible preferred stock that is converted | 1,000 | 1,000 |  |
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
Preferred stock conversion price per share |  | $ 4.03 |  |
Series Y Convertible Preferred Stock |  |  |  |
Sale of stock |  |  |  |
Shares issued (in shares) | 1,252.772 |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  | 0
Preferred stock conversion price per share | $ 13.00 |  |  |

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