v3.20.4

Stock incentive plans - Plans (Details) - shares | 12 Months Ended | 60 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
2011 Plan |  |
Stock incentive plans |  |
Common stock shares reserved for issuance | 13,739,820 |
2001 Plan |  |
Stock incentive plans |  |
Number of options outstanding | 0 |
Number of awards made | 0 |
Stock options |  |
Stock incentive plans |  |
Number of options outstanding | 109,000 | 235,000
Number of awards made | 0 | 0
Stock options | 2011 Plan |  |
Stock incentive plans |  |
Number of options outstanding | 109,000 | 228,000
Stock options | 2001 Plan |  |
Stock incentive plans |  |
Number of options outstanding |  | 7,000
RSUs |  |
Stock incentive plans |  |
RSUs outstanding | 951,000 |

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