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Intangible Assets and Goodwill (Details 2) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2023
Components of intangible assets |  |  |  |
Intangible assets, gross | $ 331,908 | $ 349,421 |  |
Accumulated amortization | (303,139) | (298,541) |  |
Finite-lived intangible assets | 21,369 |  |  |
In-process research and development | 7,400 |  |  |
Intangible assets, net | 28,769 | 50,880 |  |
Acquisition of intangible assets | $ 0 | 3,000 | $ 0 |
Divestiture, not discontinued operations | PHY IP Group |  |  |  |
Components of intangible assets |  |  |  |
Disposal of intangible assets, noncurrent |  |  |  | $ 7,400
Minimum |  |  |  |
Components of intangible assets |  |  |  |
Useful life (in years) | 6 months |  |  |
Maximum |  |  |  |
Components of intangible assets |  |  |  |
Useful life (in years) | 10 years |  |  |
In-process research and development |  |  |  |
Components of intangible assets |  |  |  |
In-process research and development | $ 7,400 | 11,200 |  |
In-process research and development | Divestiture, not discontinued operations | PHY IP Group |  |  |  |
Components of intangible assets |  |  |  |
Disposal of intangible assets, noncurrent |  |  |  | $ 3,800
Existing technology |  |  |  |
Components of intangible assets |  |  |  |
Gross carrying amount | 286,712 | 299,925 |  |
Accumulated amortization | (265,756) | (261,708) |  |
Finite-lived intangible assets | $ 20,956 | 38,217 |  |
Acquisition of intangible assets |  | $ 3,000 |  |
Identified intangible assets assumed, useful life (in years) |  | 5 years |  |
Existing technology | Minimum |  |  |  |
Components of intangible assets |  |  |  |
Useful life (in years) | 3 years | 3 years |  |
Existing technology | Maximum |  |  |  |
Components of intangible assets |  |  |  |
Useful life (in years) | 10 years | 10 years |  |
Customer contracts and contractual relationships |  |  |  |
Components of intangible assets |  |  |  |
Gross carrying amount | $ 37,496 | $ 37,996 |  |
Accumulated amortization | (37,083) | (36,533) |  |
Finite-lived intangible assets | $ 413 | $ 1,463 |  |
Customer contracts and contractual relationships | Minimum |  |  |  |
Components of intangible assets |  |  |  |
Useful life (in years) | 6 months | 6 months |  |
Customer contracts and contractual relationships | Maximum |  |  |  |
Components of intangible assets |  |  |  |
Useful life (in years) | 10 years | 10 years |  |
Non-compete agreements and trademarks |  |  |  |
Components of intangible assets |  |  |  |
Gross carrying amount | $ 300 | $ 300 |  |
Accumulated amortization | (300) | (300) |  |
Finite-lived intangible assets | $ 0 | $ 0 |  |
Useful life (in years) | 3 years | 3 years |  |

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