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Stock-based Compensation - Performance-based stock options (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Share-based compensation |  |  |
Stock-based compensation expense | $ 1,788 | $ 1,728 |
Stock Options |  |  |
Share-based compensation |  |  |
Unrecognized compensation expense related to stock options (in dollars) | $ 4,000 |  |
Stock Options Vesting Based On Performance |  |  |
Share-based compensation |  |  |
Number of options outstanding, non-vested options | 0 |  | 41,250
Grant date fair value |  |  | $ 200
Stock-based compensation expense |  |  | $ 200
Unrecognized compensation expense related to stock options (in dollars) | $ 0 |  |

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