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Share based compensation options contractual term.

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The highest quantity of shares an employee can purchase under the plan per period.

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Shareholders' equity - Additional Information (Details) - USD ($)						1 Months Ended		3 Months Ended		6 Months Ended				9 Months Ended		12 Months Ended
	Mar. 18, 2024	Mar. 01, 2023	Feb. 25, 2022	Mar. 01, 2021	Mar. 24, 2020	May 31, 2023	Jun. 30, 2019	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense								$ 2,586,000	$ 2,875,000		$ 5,147,000		$ 5,937,000	$ 7,642,000	$ 8,782,000	$ 9,824,000	$ 11,593,000
Shares granted																1,044,920
Forfeiture rate utilized for estimating forfeitures of options and restricted share units granted																11.40%	8.20%
Share options contractual term																10 years
Aggregate intrinsic value of options exercised										$ 0		$ 0				$ 0	$ 0
Share options exercised																0	59,800
Cash received from share options exercised									$ 387,000				$ 492,000		$ 498,000	$ 0	$ 498,000
Unrecognized pre-tax share based compensation expense related to unvested share option awards										$ 9,100,000						$ 9,100,000
Unrecognized share-based compensation expense, weighted-average period of recognition																2 years 7 months 6 days
Perforamance awards issued										1,263,210		556,340				1,263,210	556,340
Common stock dividends paid																$ 0
Ordinary shares, authorized								500,000,000	500,000,000	500,000,000	500,000,000	500,000,000	500,000,000	500,000,000	500,000,000	500,000,000	500,000,000
Employee Share Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense																$ 600,000		$ 900,000
Number of outstanding shares added annually							275,000
Percentage of outstanding shares							1.00%
Total number of shares available under ESPP																1,334,427
Number of original shares available under ESPP							550,000
Number of additional shares available under ESPP	275,000	273,133	267,352	260,345	256,730
Percentage of purchase price shares on first trading day of each offering period or on the purchase date							85.00%									85.00%
Shares issued under the ESPP										341,107	279,403	113,218	88,290
RSAs and RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized share-based compensation expense, weighted-average period of recognition																2 years 3 months 18 days
Shares to pay employees' portion of minimum payroll withholding taxes																12,735	50,775
Unrecognized pre-tax compensation expense related to unvested restricted share awards and restricted shares units										$ 4,700,000						$ 4,700,000
Performance shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance options issued						60,000
Perforamance awards issued						135,000
Performance shares \| Tranche One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized pre-tax compensation expense related to unvested restricted share awards and restricted shares units												$ 400,000					$ 400,000
Perforamance awards issued												62,500					62,500
Performance shares \| Tranche Two
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares granted																	62,500
Unrecognized pre-tax compensation expense related to unvested restricted share awards and restricted shares units										$ 500,000						$ 500,000
Shares vesting, percentage						50.00%
2019 Share Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized	1,320,000	1,320,000								1,320,000		1,320,000				1,320,000	1,320,000
Percentage of outstanding shares							5.00%
2019 Share Incentive Plan \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of outstanding shares added annually							1,320,000
2019 Share Incentive Plan \| RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares granted																1,044,920	225,338