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Capital Stock - Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2017 | Dec. 31, 2018 | Dec. 31, 2017
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 |
Series X Convertible Preferred Stock |  |  |
Sale of stock |  |  |
Issuance of stock, net (in shares) |  |  | 5,003
Preferred stock conversion price per share |  | $ 4.03 |
Fair value of common stock amount exceeded purchase price of convertible preferred stock | $ 5.6 |  |
Series Y Preferred Stock |  |  |
Sale of stock |  |  |
Issuance of stock, net (in shares) |  | 1,252.772 |
Preferred stock conversion price per share |  | $ 13.00 |

X
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X
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