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Share-based compensation (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Jun. 11, 2020 | Jun. 07, 2018 | Sep. 17, 2014
Share-based compensation |  |  |  |  |  |  |
Common stock reserved for issuance |  | 4,350,191 |  |  |  |  |
Stock option vesting period |  | 1 year |  | 1 year |  |  |
Share-based compensation arrangement by share based payment award percentage of fair market person holding more then 10% voting stock |  | 110.00% |  |  |  |  |
Intrinsic value of options outstanding |  | $ 26.9 |  | $ 20.6 |  |  |
Intrinsic value of options unvested |  | 0.8 |  | $ 1.1 |  |  |
Intrinsic value of options exercised |  | $ 2.3 | $ 2.1 |  |  |  |
Stock Option Plan |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Stock option vesting period |  | 2 years |  |  |  |  |
Stock option vesting, percentage |  | 50.00% |  | 50.00% |  |  |
Option to purchase granted |  | 575,098 |  | 381,181 |  |  |
Options vested |  | 337,727 |  | 40,588 |  |  |
Minimum | Stock Option Plan |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Contractual term |  | 3 years |  |  |  |  |
Maximum | Stock Option Plan |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Contractual term |  | 10 years |  |  |  |  |
2014 Stock Incentive Plan |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Common stock reserved for issuance |  |  |  |  |  |  | 3,000,000
2018 Stock Incentive Plan |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Common stock reserved for issuance |  |  |  |  |  | 4,000,000 |
2020 Stock Incentive Plan |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Common stock reserved for issuance |  |  |  |  | 3,000,000 |  |
Stock Option Plan |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Options granted |  | 592,798 |  | 381,181 |  |  |
Share-based awards at the granted |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Options granted |  | 592,798 | 379,070 |  |  |  |
Stock Appreciation Rights (SARs) |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Stock option vesting period | 9 months |  |  |  |  |  |
Option to purchase granted | 17,700 |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Share based compensation expense |  | $ 2.1 | $ 0.8 |  |  |  |

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