v3.21.1

Stock incentive plans - Plans (Details) - shares | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
2001 Plan |  |
Stock incentive plans |  |
Number of options outstanding | 0 |
Number of awards made | 0 |
Stock options |  |
Stock incentive plans |  |
Number of options outstanding | 96,000 | 109,000
Stock options | 2011 Plan |  |
Stock incentive plans |  |
Number of options outstanding | 96,000 |
RSUs | 2011 Plan |  |
Stock incentive plans |  |
RSUs outstanding | 1,673,000 |

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