Summary of business and significant accounting policies (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2022	Nov. 24, 2020	Apr. 12, 2017
Property, Plant and Equipment [Line Items]
Allowance for Doubtful Other Receivables, Current	$ 500	$ 500	$ 400
Contract with Customer, Liability	59,100	59,100	60,400
Deferred Revenue, Revenue Recognized		57,200	43,100
Advertising Expense		44,100	40,800	$ 35,800
Accumulated deficit	(249,296)	$ (249,296)	(196,113)		$ 47,100
Product Warranty Liability [Line Items]
Warranty Period		12 months
Gain (Loss) on Extinguishment of Debt	3,100	$ 3,092	0	0
Gain (Loss) on Extinguishment of Debt	$ 3,100	$ 3,092	$ 0	$ 0
Convertible Senior Notes due 2022 [Member]
Property, Plant and Equipment [Line Items]
Interest rate							3.50%
Debt Instrument							$ 175,000
Convertible Senior Notes due 2025 [Member]
Property, Plant and Equipment [Line Items]
Interest rate						1.25%
Debt Instrument						$ 143,800
Europe [Member]
Product Warranty Liability [Line Items]
Warranty Period		24 months