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Stock-Based Compensation (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 09, 2020 | May 01, 2018 | May 05, 2016 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2016
Stock-Based Compensation Plans |  |  |  |  |  |
Number of awards previously granted under prior plans remains outstanding |  |  |  | 0 |  |
Stock-based compensation expense |  |  |  | $ 703 | $ 1,205 |
Restricted stock awards |  |  |  |  |  |
Stock-Based Compensation Plans |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  | 15 |
Restricted stock units |  |  |  |  |  |
Stock-Based Compensation Plans |  |  |  |  |  |
Stock-based compensation expense |  |  |  | $ 703 | 893 |
Common stock awards |  |  |  |  |  |
Stock-Based Compensation Plans |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  | $ 297 |
The 2016 Plan |  |  |  |  |  |
Stock-Based Compensation Plans |  |  |  |  |  |
Number of shares authorized |  | 1,050,000 |  |  |  | 1,000,000
Percentage of stock dividend approved by the board |  | 5.00% |  |  |  |
Restated 2016 Plan |  |  |  |  |  |
Stock-Based Compensation Plans |  |  |  |  |  |
Number of shares authorized | 2,050,000 |  |  |  |  |
Number of additional shares authorized | 1,000,000 |  |  |  |  |
Shares available for future issuance |  |  |  | 1,376,299 |  |
Option expiration term |  |  | 10 years |  |  |

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