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Summary of significant accounting policies - Accounting for Share-based Compensation (Details)	12 Months Ended
	Dec. 31, 2023 plan shares	Sep. 28, 2023 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock based employee compensation plans | plan	2
Contractual life of awards	7 years
2023 Equity Inducement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares) | shares	5,000,000	5,000,000

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Represents the number of stock-based compensation plans the company maintains.

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