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Basis of Presentation, Use of Accounting Estimates and Significant Accounting Policies - Prior Period Reclassifications on the Condensed Consolidated Statements of Income (Loss) (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 63 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 02, 2020 | Nov. 30, 2019 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  | $ 270,064 | $ 253,215 | $ 264,483 | $ 247,603 | $ 269,555 | $ 240,083 | $ 182,206 | $ 242,397 | $ 1,035,365 | $ 934,241 | [1] | $ 1,084,170 | [1] |
Cost of sales - exclusive of amortization |  |  |  |  |  |  |  |  |  |  | 329,371 | 339,478 | [1] | 360,365 | [1] |
Product remediation |  |  |  |  |  |  |  |  |  |  | 800 | 0 |  | 0 |  |
Gross Profit |  |  | 201,643 | 168,664 | 172,279 | 163,408 | 166,895 | 147,591 | 114,970 | 165,307 | 705,994 | 594,763 | [1] | 723,805 | [1] |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selling, general & administrative |  |  |  |  |  |  |  |  |  |  | 471,904 | 446,561 | [1] | 528,466 | [1] |
Research & development |  |  |  |  |  |  |  |  |  |  | 183,414 | 152,902 | [1] | 146,849 | [1] |
Merger and integration expenses |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |
Restructuring expenses |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |
Impairment of disposal group and loss on sale |  |  |  |  |  |  |  |  |  |  | 0 | 180,160 | [1] | 0 | [1] |
Impairment of goodwill | $ 21,300 | $ 42,400 |  |  |  |  |  |  |  |  | 0 | 21,269 | [1],[2] | 42,417 | [1],[2] | $ 63,700
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  | 0 | 6,762 | [1] | 142,517 | [1] |
Amortization of intangibles |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |
Decommissioning provision |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |
Litigation provision, net |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |
Other operating expenses |  |  |  |  |  |  |  |  |  |  | 51,460 | 61,008 | [1] | 35,110 | [1] |
Operating loss from continuing operations |  |  | $ 24,754 | $ 16,422 | $ (36,262) | $ (5,698) | $ (249,023) | $ (7,552) | $ (16,743) | $ (581) | (784) | (273,899) | [1] | (171,554) | [1] |
Interest income |  |  |  |  |  |  |  |  |  |  | 435 | 131 | [1] | 803 | [1] |
Interest expense |  |  |  |  |  |  |  |  |  |  | (50,151) | (40,837) | [1] | (15,091) | [1] |
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  |  | (60,238) | (1,407) | [1],[2] | 0 | [1],[2] |
Foreign exchange and other gains/(losses) |  |  |  |  |  |  |  |  |  |  | (13,734) | (32,010) | [1] | (2,536) | [1] |
Loss from continuing operations before tax |  |  |  |  |  |  |  |  |  |  | $ (124,472) | (348,022) | [1] | (188,378) | [1] |
As Revised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 934,241 |  | 1,084,170 |  |
Cost of sales - exclusive of amortization |  |  |  |  |  |  |  |  |  |  |  | 312,097 |  | 326,201 |  |
Product remediation |  |  |  |  |  |  |  |  |  |  |  | 7,860 |  | 15,777 |  |
Gross Profit |  |  |  |  |  |  |  |  |  |  |  | 614,284 |  | 742,192 |  |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selling, general & administrative |  |  |  |  |  |  |  |  |  |  |  | 427,770 |  | 506,478 |  |
Research & development |  |  |  |  |  |  |  |  |  |  |  | 152,902 |  | 146,849 |  |
Merger and integration expenses |  |  |  |  |  |  |  |  |  |  |  | 7,333 |  | 23,457 |  |
Restructuring expenses |  |  |  |  |  |  |  |  |  |  |  | 7,571 |  | 12,254 |  |
Impairment of disposal group and loss on sale |  |  |  |  |  |  |  |  |  |  |  | 180,160 |  | 0 |  |
Impairment of goodwill |  |  |  |  |  |  |  |  |  |  |  | 21,269 |  | 42,417 |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  | 6,762 |  | 142,517 |  |
Amortization of intangibles |  |  |  |  |  |  |  |  |  |  |  | 38,312 |  | 40,375 |  |
Decommissioning provision |  |  |  |  |  |  |  |  |  |  |  | 42,198 |  | 0 |  |
Litigation provision, net |  |  |  |  |  |  |  |  |  |  |  | 3,906 |  | (601) |  |
Other operating expenses |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |
Operating loss from continuing operations |  |  |  |  |  |  |  |  |  |  |  | (273,899) |  | (171,554) |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  | 131 |  | 803 |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  | (40,837) |  | (15,091) |  |
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |
Foreign exchange and other gains/(losses) |  |  |  |  |  |  |  |  |  |  |  | (33,417) |  | (2,536) |  |
Loss from continuing operations before tax |  |  |  |  |  |  |  |  |  |  |  | (348,022) |  | (188,378) |  |
Reclassifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |
Cost of sales - exclusive of amortization |  |  |  |  |  |  |  |  |  |  |  | 27,381 |  | 34,164 |  |
Product remediation |  |  |  |  |  |  |  |  |  |  |  | (7,860) |  | (15,777) |  |
Gross Profit |  |  |  |  |  |  |  |  |  |  |  | (19,521) |  | (18,387) |  |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selling, general & administrative |  |  |  |  |  |  |  |  |  |  |  | 18,791 |  | 21,988 |  |
Research & development |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |
Merger and integration expenses |  |  |  |  |  |  |  |  |  |  |  | (7,333) |  | (23,457) |  |
Restructuring expenses |  |  |  |  |  |  |  |  |  |  |  | (7,571) |  | (12,254) |  |
Impairment of disposal group and loss on sale |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |
Impairment of goodwill |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |
Amortization of intangibles |  |  |  |  |  |  |  |  |  |  |  | (38,312) |  | (40,375) |  |
Decommissioning provision |  |  |  |  |  |  |  |  |  |  |  | (42,198) |  | 0 |  |
Litigation provision, net |  |  |  |  |  |  |  |  |  |  |  | (3,906) |  | 601 |  |
Other operating expenses |  |  |  |  |  |  |  |  |  |  |  | 61,008 |  | 35,110 |  |
Operating loss from continuing operations |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  |  |  | (1,407) |  | 0 |  |
Foreign exchange and other gains/(losses) |  |  |  |  |  |  |  |  |  |  |  | 1,407 |  | 0 |  |
Loss from continuing operations before tax |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  |
[1] | The consolidated statements of income (loss) for the years ended December 31, 2020 and 2019 have been revised. For further details refer to “Note 1. Nature of Operations.”
[2] | The consolidated statements of cash flows for the years ended December 31, 2020 and 2019 have been revised. For further details refer to “Note 1. Nature of Operations.”

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