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Stock-based compensation - Shares Authorized Under Stock Option Plan (Details) | 12 Months Ended
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Dec. 31, 2023 $ / shares shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
Shares outstanding | shares | 217,250
Weighted Average Remaining Contractual Life | 2 years 21 days
Weighted Average Exercise Price (in dollars per share) | $ 2.21
$1.00 - 1.50 |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
Option, exercise price range, lower range limit | 1.00
Option, exercise price range, upper range limit | $ 1.50
Shares outstanding | shares | 2,000
Weighted Average Remaining Contractual Life | 2 years 10 months 6 days
Weighted Average Exercise Price (in dollars per share) | $ 1.49
$1.51 - 2.00 |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
Option, exercise price range, lower range limit | 1.51
Option, exercise price range, upper range limit | $ 2.00
Shares outstanding | shares | 116,500
Weighted Average Remaining Contractual Life | 2 years 3 months 25 days
Weighted Average Exercise Price (in dollars per share) | $ 1.89
$2.01 - 2.50 |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
Option, exercise price range, lower range limit | 2.01
Option, exercise price range, upper range limit | $ 2.50
Shares outstanding | shares | 84,500
Weighted Average Remaining Contractual Life | 1 year 4 months 9 days
Weighted Average Exercise Price (in dollars per share) | $ 2.07
$2.51 - 8.60 |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |
Option, exercise price range, lower range limit | 2.51
Option, exercise price range, upper range limit | $ 8.60
Shares outstanding | shares | 14,250
Weighted Average Remaining Contractual Life | 3 years 11 months 1 day
Weighted Average Exercise Price (in dollars per share) | $ 5.69

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