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Stock incentive plans, Assumptions used in option valuation calculations (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Stock Options [Member]
Assumptions used in valuation model [Abstract]
Term of award	10 years
2014 Equity Incentive Plan [Member]
Assumptions used in valuation model [Abstract]
Expected option term	6 years 10 months 24 days	7 years
Expected volatility	50.50%	41.70%
Risk-free interest rate	1.20%	0.90%
Dividend yield	0.00%	0.00%
2014 Equity Incentive Plan [Member] | Stock Options [Member]
Assumptions used in valuation model [Abstract]
Weighted average fair value of grants (in dollars per share)	$ 5.41	$ 3.19
Term of award	10 years
2014 Equity Incentive Plan [Member] | Restricted Share Units [Member]
Assumptions used in valuation model [Abstract]
Weighted average fair value of grants (in dollars per share)	$ 10.27	$ 9.77

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- References

No definition available.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Expected term of 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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Weighted average grant-date fair value of non-vested options outstanding.

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