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Commitments and contingencies - Narrative (Details) - USD ($) $ in Thousands |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 23, 2021 | Dec. 22, 2020 | Aug. 23, 2019 | Feb. 09, 2016 | Jul. 03, 2021 | Jun. 27, 2020 | Jul. 03, 2021 | Jun. 27, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stop loss insurance, threshold per member per year |  |  |  |  |  |  | $ 200 |  |  |  |
Bio Ventus LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Refund of excess payments to third party customers |  |  |  |  |  |  |  |  | $ 1,519 | $ 7,458 |
Stop loss insurance, threshold per member per year |  |  |  |  |  |  |  |  | 150 |  |
Other Current Liabilities [Member] | Bio Ventus LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss contingency accrual product liability net |  |  |  |  |  |  |  |  | 2,790 | 6,801 |
USAO And OIG [Member] | Bio Ventus LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss contingency accrual |  |  |  |  |  |  |  |  | 1,200 | 3,600 |
Loss contingency accruals payments made during the year |  |  |  |  |  |  |  |  |  | 2,400 |
USAO And OIG [Member] | Subsequent Event [Member] | Bio Ventus LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss contingency accruals payments made during the year | $ 1,200 |  |  |  |  |  |  |  |  |  |
Bioness, Inc |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value |  |  |  |  |  |  | $ 1,200 |  |  |  |
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 |  |  |  |  | 7 years 3 months |  | 7 years 3 months |  |  |  |
Three Injection OA Product |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Supply commitment, term |  |  |  | 10 years |  |  |  |  |  |  |
Supply commitment, renewal term |  |  |  | 5 years |  |  |  |  |  |  |
Three Injection OA Product | Bio Ventus LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Supply commitment, term |  |  |  | 10 years |  |  |  |  |  |  |
Supply commitment, renewal term |  |  |  | 5 years |  |  |  |  |  |  |
Collaborative agreement, term |  | 8 years |  |  |  |  |  |  |  |  |
Harbor |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Collaborative agreement, royalty percentage |  |  | 3.00% |  |  |  |  |  |  |  |
Collaborative agreement, term |  | 8 years |  |  |  |  |  |  |  |  |
Harbor | Bio Ventus LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Collaborative agreement, royalty percentage |  |  | 3.00% |  |  |  |  |  |  |  |
Milestone payment payable |  |  |  |  |  |  |  |  |  | 6,000 |
Supplier of Single Injection OA Product |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Royalty expense |  |  |  |  | $ 3,548 | $ 1,767 | $ 5,925 | $ 3,969 |  |  |
Supplier of Single Injection OA Product | Bio Ventus LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Royalty expense |  |  |  |  |  |  |  |  | 10,021 | $ 7,622 | $ 3,082
Damages from Product Defects |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated probable loss related to product recall |  |  |  |  | 2,055 |  | 2,055 |  |  |  |
Recorded reserves for product recall |  |  |  |  | $ 434 |  | $ 434 |  | 1,684 |  |
Damages from Product Defects | Bio Ventus LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated probable loss related to product recall |  |  |  |  |  |  |  |  | $ 1,684 |  |

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