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Fair value measurements (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 03, 2021 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Schedule of Liabilities Measured At Fair Value on Recurring Basis | The following table provides information for liabilities measured at fair value on a recurring basis using Level 2 and Level 3 inputs:
|  | July 3, 2021 |  |  | December 31, 2020 |
|  | Total |  |  | Level 2 |  |  | Level 3 |  |  | Total |  |  | Level 2 |  |  | Level 3 |
Interest rate swap |  | $ | 292 |  |  | $ | 292 |  |  | $ | — |  |  | $ | 1,602 |  |  | $ | 1,602 |  |  | $ | — |
Current portion of contingent consideration |  |  | 13,220 |  |  |  | — |  |  |  | 13,220 |  |  |  | — |  |  |  | — |  |  |  | — |
Long-term contingent consideration, less current portion |  |  | 30,421 |  |  |  | — |  |  |  | 30,421 |  |  |  | — |  |  |  | — |  |  |  | — |
Management incentive plan and liability-classified awards |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 40,303 |  |  |  | — |  |  |  | 40,303 |
Equity Participation Right |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 6,101 |  |  |  | — |  |  |  | 6,101 |
Total liabilities |  | $ | 43,933 |  |  | $ | 292 |  |  | $ | 43,641 |  |  | $ | 48,006 |  |  | $ | 1,602 |  |  | $ | 46,404 |
Schedule of Fair Value Measurement Inputs and Valuation Techniques | After the initial valuation, the Company will use its best estimate to measure contingent consideration related to the Bioness Acquisition at each subsequent reporting period using the following unobservable Level 3 inputs:
|  | Valuation Technique |  | Unobservable inputs |  | Range
Bioness contingent consideration |  | Discounted cash flow |  | Payment discount rate |  | 5.0% - 6.8%
|  |  |  | Payment period |  | 2021 - 2025
Schedule of Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation | The following table provides a reconciliation of the beginning and ending balances for the MIP and liability-classified awards at fair value using significant unobservable inputs or Level 3:
Balance at December 31, 2020 |  | $ | 40,303 |
Change in fair value |  |  | (25,185 | )
Initial estimate (vesting) |  |  | 829 |
Payments |  |  | (11,281 | )
Phantom plan conversion to Class A common stock |  |  | (4,666 | )
Balance at July 3, 2021 |  | $ | — |
The following table provides a reconciliation of the beginning and ending balances for the EPR Unit at fair value using significant unobservable inputs Level 3:
Balance at December 31, 2020 |  | $ | 6,101 |
Change in fair value |  |  | (2,774 | )
Payment |  |  | (3,327 | )
Balance at July 3, 2021 |  | $ | — |
Summary of range of key assumptions used within the valuation of the awards | The following table provides a reconciliation of the beginning and ending balances for the MIP and liability-classified awards at fair value using significant unobservable inputs or Level 3:
Balance at December 31, 2020 |  | $ | 40,303 |
Change in fair value |  |  | (25,185 | )
Initial estimate (vesting) |  |  | 829 |
Payments |  |  | (11,281 | )
Phantom plan conversion to Class A common stock |  |  | (4,666 | )
Balance at July 3, 2021 |  | $ | — |
The following table provides a reconciliation of the beginning and ending balances for the EPR Unit at fair value using significant unobservable inputs Level 3:
Balance at December 31, 2020 |  | $ | 6,101 |
Change in fair value |  |  | (2,774 | )
Payment |  |  | (3,327 | )
Balance at July 3, 2021 |  | $ | — |
Bio Ventus LLC [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Schedule of Liabilities Measured At Fair Value on Recurring Basis |  | The following table provides information for liabilities measured at fair value on a recurring basis using Level 2 and Level 3 inputs.
|  | December 31, 2020 |  |  | December 31, 2019 |
|  | Total |  |  | Level 2 |  |  | Level 3 |  |  | Level 3 |
Interest rate swap |  | $ | 1,602 |  |  | $ | 1,602 |  |  | $ | — |  |  | $ | — |
Management incentive plan and liability-classified awards |  |  | 40,303 |  |  |  | — |  |  |  | 40,303 |  |  |  | 40,802 |
Equity Participation Rights |  |  | 6,101 |  |  |  | — |  |  |  | 6,101 |  |  |  | 5,457 |
Total liabilities |  | $ | 48,006 |  |  | $ | 1,602 |  |  | $ | 46,404 |  |  | $ | 46,259 |
Schedule of Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation |  | The following table provides a reconciliation of the beginning and ending balances for the MIP and liability-classified awards at fair value using significant unobservable inputs or Level 3:
Balance at December 31, 2018 |  | $ | 33,063 |
Initial estimate (vesting) |  |  | 5,464 |
Forfeitures |  |  | (1,013 | )
Change in fair value |  |  | 6,290 |
Payment |  |  | (3,002 | )
Balance at December 31, 2019 |  |  | 40,802 |
Initial estimate (vesting) |  |  | 4,734 |
Forfeitures |  |  | (1,298 | )
Change in fair value |  |  | 6,641 |
Payment |  |  | (10,576 | )
Balance at December 31, 2020 |  | $ | 40,303 |
The following table provides a reconciliation of the beginning and ending balances for the EPR Unit at fair value using significant unobservable inputs Level 3:
Balance at December 31, 2018 |  | $ | 4,892 |
Change in fair value |  |  | 565 |
Balance at December 31, 2019 |  |  | 5,457 |
Change in fair value |  |  | 644 |
Balance at December 31, 2020 |  | $ | 6,101 |
Summary of range of key assumptions used within the valuation of the awards |  | The following table provides a reconciliation of the beginning and ending balances for the MIP and liability-classified awards at fair value using significant unobservable inputs or Level 3:
Balance at December 31, 2018 |  | $ | 33,063 |
Initial estimate (vesting) |  |  | 5,464 |
Forfeitures |  |  | (1,013 | )
Change in fair value |  |  | 6,290 |
Payment |  |  | (3,002 | )
Balance at December 31, 2019 |  |  | 40,802 |
Initial estimate (vesting) |  |  | 4,734 |
Forfeitures |  |  | (1,298 | )
Change in fair value |  |  | 6,641 |
Payment |  |  | (10,576 | )
Balance at December 31, 2020 |  | $ | 40,303 |
The following table provides a reconciliation of the beginning and ending balances for the EPR Unit at fair value using significant unobservable inputs Level 3:
Balance at December 31, 2018 |  | $ | 4,892 |
Change in fair value |  |  | 565 |
Balance at December 31, 2019 |  |  | 5,457 |
Change in fair value |  |  | 644 |
Balance at December 31, 2020 |  | $ | 6,101 |
Equity Participation Right Unit [Member] | Bio Ventus LLC [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Schedule of Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation |  | The following table provides a range of key assumptions used within the valuation of the awards as of December 31, 2020:
Valuation technique |  | Unobservable inputs |  | Range |  | Weighted Average
Option pricing approach |  | Time to liquidity event |  | 0.4 |  | 0.4
|  | Risk free rate |  | 0.10% |  | 0.10%
|  | Equality volatility |  | 35.13% - 101.25% |  | 50.0%
|  | Equity value |  | $1,065,000 - $1,240,000 |  | $1,145,000
|  | Lack of marketability discount |  | 7.0% |  | 7.0%
Summary of range of key assumptions used within the valuation of the awards |  | The following table provides a range of key assumptions used within the valuation of the awards as of December 31, 2020:
Valuation technique |  | Unobservable inputs |  | Range |  | Weighted Average
Option pricing approach |  | Time to liquidity event |  | 0.4 |  | 0.4
|  | Risk free rate |  | 0.10% |  | 0.10%
|  | Equality volatility |  | 35.13% - 101.25% |  | 50.0%
|  | Equity value |  | $1,065,000 - $1,240,000 |  | $1,145,000
|  | Lack of marketability discount |  | 7.0% |  | 7.0%

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19279-110258 + Details
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