Stock option plans - Restricted stock units (Details) - Restricted stock units	12 Months Ended
Dec. 31, 2021 USD ($) $ / shares shares
Unrecognized compensation cost related to RSU \| $	$ 1,644,247
Recognition period for unrecognized compensation cost	1 year 10 months 24 days
Restricted stock units
Granted (in shares)	523,050
Vested (in shares)	(107,331)
Cancelled/Forfeited (in shares)	(16,000)
Ending balance (in shares)	399,719
Weighted average grant date fair value
Granted, Weighted average grant date fair value \| $ / shares	$ 5.91
Vested, Weighted average grant date fair value \| $ / shares	5.94
Cancelled/Forfeited, Weighted average grant date fair value \| $ / shares	6.00
Ending balance, Weighted average grant date fair value \| $ / shares	$ 5.91
Executive officers and Certain other employees
Restricted stock units
Granted (in shares)	500,000
Cancelled/Forfeited (in shares)	(16,000)
Non employee directors
Restricted stock units
Granted (in shares)	23,050
Vesting On 6 Month, 12 Month and 18 Month Anniversaries Of Grant Date \| Executive officers and Certain other employees
Restricted stock units
Granted (in shares)	322,000
Vesting On 6 Month Anniversary Of Grant Date
Restricted stock units
Vesting period	6 months
Vesting On 12 Month Anniversary Of Grant Date
Restricted stock units
Vesting period	12 months
Vesting On 18 Month Anniversary Of Grant Date
Restricted stock units
Vesting period	18 months
Vesting On One Year, Two Year and Three Year Anniversaries Of Grant Date \| Executive officers and Certain other employees
Restricted stock units
Granted (in shares)	162,000
Vesting On One Year Anniversary Of Grant Date
Restricted stock units
Vesting period	1 year
Vesting On Two Year Anniversary Of Grant Date
Restricted stock units
Vesting period	2 years
Vesting On Three Year Anniversary Of Grant Date
Restricted stock units
Vesting period	3 years

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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