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Common Shares - Option Amendment (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Jul. 31, 2018 item | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Common shares |  |  |  |
Stock-based compensation expense |  |  | $ 982 | $ 874
Stock Option Agreement 2013 Amendment |  |  |  |
Common shares |  |  |  |
Number of executives and directors | item |  | 7 |  |
Stock-based compensation expense |  |  | $ 0 |
Cash buyouts of unexercised stock options | $ 61 |  |  |

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- Definition The number of executives and directors affected by the option amendment. + References No definition available. + Details
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