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Equity incentive plans - SARs Activity (Details) - Stock Appreciation Rights - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Outstanding |  |
Outstanding, beginning balance (in shares) | 95,475 |
Granted (in shares) | 17,755 |
Exercised (in shares) | (458) |
Canceled (in shares) | (6,617) |
Outstanding, ending balance (in shares) | 106,155 | 95,475
Weighted Average Exercise Price |  |
Outstanding, beginning balance (in USD per share) | $ 5.64 |
Granted (in USD per share) | 22.56 |
Exercised (in USD per share) | 3.12 |
Canceled (in USD per share) | 6.04 |
Outstanding, ending balance (in USD per share) | $ 8.45 | $ 5.64
Outstanding, Weighted Average Remaining Contractual Term (in years) | 8 years 3 months | 9 years
Outstanding, Aggregate Intrinsic Value | $ 1,267 | $ 586
Vested and Expected to Vest, Awards Outstanding (in shares) | 106,155 |
Vested and Expected to Vest, Weighted Average Exercise Price (in USD per shares) | $ 8.45 |
Vested and Expected to Vest, Weighted Average Remaining Contractual Term (in years) | 8 years 3 months |
Vested and Expected to Vest, Aggregate Intrinsic Value | $ 1,267 |
Exercisable, Awards Outstanding (in shares) | 48,560 |
Exercisable, Weighted Average Exercise Price (in USD per share) | $ 5.34 |
Exercisable, Weighted Average Remaining Contractual Term (in years) | 7 years 10 months 24 days |
Exercisable, Aggregate Intrinsic Value | $ 690 |

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