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Disposals - Operating Results of the Disposal Group (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Asset impairments | $ 0 | $ (140,461) | $ (113,007)
Tripwire | Discontinued Operations, Held-for-sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Revenues | 12,067 | 106,840 | 110,524
Cost of sales | (3,256) | (24,321) | (22,857)
Gross profit | 8,811 | 82,519 | 87,667
Selling, general and administrative expenses | (8,185) | (48,308) | (42,741)
Research and development expenses | (5,528) | (34,433) | (34,276)
Amortization of intangible assets | (638) | (7,716) | (35,354)
Asset impairments | 0 | (131,178) | 0
Loss before taxes | $ (5,540) | $ (139,116) | (24,704)
Grass Valley |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Asset impairments |  |  | (113,000)
Grass Valley | Discontinued Operations, Held-for-sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Revenues |  |  | 109,195
Cost of sales |  |  | (70,199)
Gross profit |  |  | 38,996
Selling, general and administrative expenses |  |  | (39,947)
Research and development expenses |  |  | (15,083)
Asset impairments |  |  | (113,007)
Interest expense, net |  |  | (432)
Non-operating pension cost |  |  | (169)
Loss before taxes |  |  | $ (129,642)

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