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Supplemental disclosure of cash flow information (Tables) | 12 Months Ended
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Dec. 31, 2018
Cash Flow Statement [Abstract] |
Non-cash financing and investing activities |
Non-cash financing and investing activities: | 2018 |  |  | 2017 |
Compensatory shares | $ | 693 |  |  | $ | 1,003 |
Constrained earn-out receivable on sale of assets | 2,000 |  |  | — |

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- Definition Cash Flow Statement [Abstract] + References No definition available. + Details
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- Definition Disclosure Of Cash Flow Statement, Investing And Financing Activities, Explanatory [Table Text Block] + References No definition available. + Details
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