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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount, before tax, of realized and unrealized gain (loss) from foreign currency transaction.

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Risks and uncertainties (Details) $ in Thousands	12 Months Ended
Risks and uncertainties (Details) $ in Thousands	Dec. 31, 2023 USD ($) customer	Dec. 31, 2022 USD ($) customer	Dec. 31, 2021 USD ($)
Concentration Risk [Line Items]
Cash balances	$ 257,227	$ 256,729
Net loss on foreign currency transactions	$ (2,300)	$ (1,500)	$ (700)
Billed receivables \| Customer Concentration Risk
Concentration Risk [Line Items]
Number of major customers \| customer	1	2
Unbilled receivables \| Customer Concentration Risk
Concentration Risk [Line Items]
Number of major customers \| customer	2	2
Sales \| Customer Concentration Risk \| Customer One
Concentration Risk [Line Items]
Concentration risk, percentage	14.40%	12.60%	11.60%
Sales \| Customer Concentration Risk \| Customer Two
Concentration Risk [Line Items]
Concentration risk, percentage		10.60%	11.00%
Ukraine
Concentration Risk [Line Items]
Cash balances	$ 4,300	$ 600
Non-US
Concentration Risk [Line Items]
Cash balances	$ 21,200	$ 16,800