Commitments and contingencies - Narrative (Details) - USD ($) $ in Thousands					1 Months Ended	3 Months Ended		7 Months Ended
	Nov. 10, 2021	Dec. 22, 2020	Aug. 23, 2019	Feb. 09, 2016	Feb. 28, 2021	Apr. 02, 2022	Apr. 03, 2021	Apr. 02, 2022	Aug. 19, 2021
Loss Contingencies [Line Items]
Stop loss insurance, threshold per member per year						$ 200
HA Product
Loss Contingencies [Line Items]
Collaborative arrangement, upfront payments	$ 853
Collaborative arrangement, amount payable upon transfer of customer data	853
Collaborative arrangement, amount payable upon obtaining product certification	$ 1,707
Collaborative arrangement, royalty percentage, threshold one	5.00%
Collaborative arrangement, sales threshold for royalties	$ 569
Collaborative arrangement, royalty percentage, threshold two	2.50%
Bioness, Inc
Loss Contingencies [Line Items]
Loss contingency, damages sought, percentage of demanded amount to be paid									50.00%
Loss contingency, damages sought, percentage under dispute									50.00%
Litigation settlement, amount awarded to other party								$ 1,000
Minimum
Loss Contingencies [Line Items]
Lessee, operating lease, remaining lease term						1 month		1 month
Maximum
Loss Contingencies [Line Items]
Lessee, operating lease, remaining lease term						6 years 6 months		6 years 6 months
Three Injection OA Product
Loss Contingencies [Line Items]
Supply commitment, term				10 years
Supply commitment, renewal term				5 years
Bioness, Inc
Loss Contingencies [Line Items]
Loss contingency, damages sought, value					$ 2,000
Harbor
Loss Contingencies [Line Items]
Collaborative agreement, royalty percentage			3.00%
Supply commitment, term		8 years
Supplier of Single Injection OA Product
Loss Contingencies [Line Items]
Royalty expense						$ 3,332	$ 2,377