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Equity-based compensation - Narrative (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Feb. 10, 2021 USD ($) Plan shares | Jun. 30, 2020 USD ($) shares | Jul. 03, 2021 USD ($) Business $ / shares shares | Apr. 03, 2021 $ / shares shares | Jun. 27, 2020 USD ($) | Jul. 03, 2021 USD ($) Business $ / shares shares | Jul. 03, 2021 USD ($) Business $ / shares shares | Jun. 27, 2020 USD ($) | Dec. 31, 2020 USD ($) Plan $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of equity-based compensation plans | 2 |  | 2 |  |  | 2 | 2 |  |  |  |
Number of awards granted (in shares) | shares | 90,000 |  |  |  |  |  |  |  |  |  |
Number of awards forfeited (in shares) | shares | 900 |  |  |  |  |  |  |  |  |  |
Equity compensation |  |  | $ 5,778 |  |  |  |  | $ 7,722 |  |  |
Income tax expense (benefit) |  |  | $ 1,714 |  | $ (110) |  | $ 1,641 | (71) |  |  |
Change in fair value |  |  |  |  |  | $ 25,185 |  |  |  |  |
Number of shares available to be awarded (in shares) | shares |  |  | 518,257 |  |  | 518,257 | 518,257 |  |  |  |
Unamortized compensation expense, RSUs |  |  | $ 9,976 |  |  | $ 9,976 | $ 9,976 |  |  |  |
Unamortized compensation expense, options |  |  | 15,797 |  |  | $ 15,797 | $ 15,797 |  |  |  |
Number of options vested (in shares) | shares |  |  |  |  |  |  | 0 |  |  |  |
Compensation expense net yet amortized, period for recognition |  |  |  |  |  | 8 months 8 days | 1 year 2 months 8 days |  |  |  |
Options outstanding, aggregate intrinsic value |  |  | 16,095 |  |  | $ 16,095 | $ 16,095 |  |  |  |
Number of shares issued (in shares) | shares |  |  |  |  |  |  | 24,063 |  |  |  |
Cash paid to settle award | $ 479 |  |  |  |  |  |  |  |  |  |
Equity compensation |  |  | 5,778 |  |  |  |  | 7,722 |  |  |
Unamortized compensation expense |  |  | $ 9,976 |  |  | 9,976 | $ 9,976 |  |  |  |
Compensation expense net yet amortized, period for recognition | shares | 90,000 |  |  |  |  |  |  |  |  |  |
Management Incentive Plan Award |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of awards granted (in shares) | shares | 0 |  |  |  |  |  |  |  |  |  |
Compensation expense net yet amortized, period for recognition | shares | 0 |  |  |  |  |  |  |  |  |  |
Phantom Share Units (PSUs) |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity compensation | $ 829 |  |  |  | 663 |  |  | 1,078 |  |  |
Decrease in fair value due to the impact of COVID-19 on the market and economy |  |  |  |  | 408 |  |  | 7,849 |  |  |
Equity compensation | $ 829 |  |  |  | $ 663 |  |  | $ 1,078 |  |  |
Phantom Share Units (PSUs) | Research and Development Expense |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity compensation |  |  |  |  |  | 1,777 |  |  |  |  |
Equity compensation |  |  |  |  |  | $ 1,777 |  |  |  |  |
RSUs |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of awards granted (in shares) | shares |  |  | 2 | 945 |  |  |  |  |  |  |
Number of awards forfeited (in shares) | shares |  |  | 4 |  |  |  |  |  |  |  |
Vested (in shares) | shares |  |  | 0 |  |  |  |  |  |  |  |
Number of Equity instruments other than options granted during period | shares |  |  | 0 |  |  |  |  |  |  |  |
Number of awards outstanding (in shares) | shares |  |  | 943 | 945 |  | 943 | 943 |  | 0 |  |
Weighted average grant-date fair value | $ / shares |  |  | $ 14.38 | $ 14.38 |  | $ 14.38 | $ 14.38 |  | $ 0 |  |
Compensation expense net yet amortized, period for recognition | shares |  |  | 2 | 945 |  |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  |  | $ 14.90 | $ 14.38 |  |  |  |  |  |  |
RSUs | Minimum |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 1 year |  |  |
RSUs | Maximum |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 4 years |  |  |
Employee Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity compensation |  |  | $ 75 |  |  |  |  |  |  |  |
Expiration period |  |  |  |  |  |  | 10 years |  |  |  |
Purchase price of common stock, percentage of fair market value |  |  |  |  |  |  | 85.00% |  |  |  |
Equity compensation |  |  | $ 75 |  |  |  |  |  |  |  |
Employee Stock | Minimum |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  | 2 years |  |  |  |  |  |  |  |
Percentage of employee compensation deducted to purchase common stock |  |  | 1.00% |  |  | 1.00% | 1.00% |  |  |  |
Employee Stock | Maximum |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |  |  |  |  |  |
Percentage of employee compensation deducted to purchase common stock |  |  | 15.00% |  |  | 15.00% | 15.00% |  |  |  |
Management Incentive Plan And Liability-Classified Awards [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 12 months |  |  |  |  |
Number of awards outstanding (in shares) | shares |  |  | 183,078 |  |  | 183,078 | 183,078 |  |  |  |
Cash paid to settle award |  |  |  |  |  | $ 10,802 |  |  |  |  |
2021 Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  | $ 0 |  |  |  | $ 0 |  |  |  |
Common Class A |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock closing price, (in dollars per share) | $ / shares |  |  | $ 16.51 |  |  | $ 16.51 | $ 16.51 |  |  |  |
Common Class A | 2021 Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized to be awarded (in shares) | shares |  |  | 7,592,476 |  |  | 7,592,476 | 7,592,476 |  |  |  |
Number of shares available to be awarded (in shares) | shares |  |  | 2,024,123 |  |  | 2,024,123 | 2,024,123 |  |  |  |
Annual percentage increase in number of shares authorized |  |  | 4.50% |  |  | 4.50% | 4.50% |  |  |  |
Bio Ventus LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of equity-based compensation plans | Plan | 2 |  |  |  |  |  |  |  | 2 |  |
Number of awards granted (in shares) | shares |  |  |  |  |  |  |  |  | 1.3 |  |
Equity compensation |  |  |  |  |  |  |  |  | $ 10,103 | $ 10,844 | $ 14,325
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 1,192 | 1,576 | 1,664
Unamortized compensation expense, RSUs |  |  |  |  |  |  |  |  | 9,741 |  |
Equity compensation |  |  |  |  |  |  |  |  | 10,103 | $ 10,844 | 14,325
Unamortized compensation expense |  |  |  |  |  |  |  |  | $ 9,741 |  |
Compensation expense net yet amortized, period for recognition | shares |  |  |  |  |  |  |  |  | 1.3 |  |
Granted (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 0 |
Defined contribution plan maximum annual contributions per employee percent |  |  |  |  |  |  |  |  | 50.00% |  |
Defined contribution plan employer matching contribution, percent of match |  |  |  |  |  |  |  |  | 6.00% |  |
Defined contribution plan employers matching contribution annual vesting percentage |  |  |  |  |  |  |  |  | 4.50% |  |
Defined Contribution Plan, Cost |  |  |  |  |  |  |  |  | $ 3,379 | $ 5,401 | $ 5,462
Bio Ventus LLC [Member] | Management Incentive Plan And Liability-Classified Awards [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vested (in shares) | shares |  |  |  |  |  |  |  |  | 0 | 0 | 0
Number of Equity instruments other than options granted during period | shares |  |  |  |  |  |  |  |  | 0 | 0 | 0
Number of awards outstanding (in shares) | shares |  | 150,252 |  |  |  |  |  |  |  |  |
Number of equity instruments other than options outstanding, including both vested and non-vested instruments | shares |  | 333,330 |  |  |  |  |  |  | 183,078 | 333,330 |
Cash paid to settle award |  | $ 6,329 |  |  |  |  |  |  |  |  |
Weighted average grant-date fair value | $ / shares |  |  |  |  |  |  |  |  | $ 4.89 |  |
Bio Ventus LLC [Member] | Other Phantom Unit [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash paid to settle award |  |  |  |  |  |  |  |  | $ 4,703 |  |
Granted (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 15.31 |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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