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Capital Stock - Rights Offering 2018 (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 19, 2018
Sale of stock |  |  |  |
Stock issuance costs |  | $ 317 |  |
Preferred stock, stated value (in dollars per share) | $ 0.05 | $ 0.05 | $ 0.05 |
Series Y Convertible Preferred Stock |  |  |  |
Sale of stock |  |  |  |
Preferred stock conversion price per share | $ 13.00 |  | $ 13.00 |
Common Stock |  |  |  |
Sale of stock |  |  |  |
Total number of shares issued |  | 1,000,000 | 354,000 |
2018 Rights Offering |  |  |  |
Sale of stock |  |  |  |
Rights offering amount |  |  |  | $ 20,000
Aggregate gross proceeds from issuance of common stock and preferred stock | $ 20,000 |  |  |
Stock issuance costs | 300 |  |  |
Net proceeds from issuance of stock | $ 19,700 |  |  |
Notice term of conversion blocker |  |  | 61 days |
2018 Rights Offering | Series Y Convertible Preferred Stock |  |  |  |
Sale of stock |  |  |  |
Total number of shares issued | 1,252.772 |  |  |
Preferred stock, stated value (in dollars per share) | $ 13,000 |  | $ 13,000 |
Number of shares issued for each share of convertible preferred stock that is converted | 1,000 |  | 1,000 |
Total number of shares of common stock issuable upon conversion | 1,252,772 |  | 1,252,772 |
Percentage of convertible preferred stock conversion blocker provision | 19.99% |  | 19.99% |
2018 Rights Offering | Common Stock |  |  |  |
Sale of stock |  |  |  |
Total number of shares issued | 285,689 |  |  |

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