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Acquisitions Acquisition (Additional Information) (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 08, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Aug. 23, 2019
Business Acquisition |  |  |  |  |
Contractual obligation | [1],[2],[3] |  | $ 203,776 |  |
Northwest Logic |  |  |  |  |
Business Acquisition |  |  |  |  |
Acquisition-related costs |  |  |  | $ 700 |
Silicon IP and Business Protocols Business from Verimatrix |  |  |  |  |
Business Acquisition |  |  |  |  |
Acquisition-related costs |  |  |  | $ 3,100 |
Goodwill expected to be tax deductible |  | $ 15,000 |  |  |
Acquisition retention bonuses |  |  |  |  |
Business Acquisition |  |  |  |  |
Contractual obligation | [1],[2],[3],[4] |  | $ 6,370 |  |
Acquisition retention bonuses | Northwest Logic |  |  |  |  |
Business Acquisition |  |  |  |  |
Contractual obligation |  |  |  |  | $ 9,000
Acquisition retention bonuses | Northwest Logic | Annual payment |  |  |  |  |
Business Acquisition |  |  |  |  |
Contractual obligation |  |  |  |  | $ 3,000
Acquisition retention bonuses | Silicon IP and Business Protocols Business from Verimatrix |  |  |  |  |
Business Acquisition |  |  |  |  |
Contractual obligation |  | $ 1,000 |  |  |
Minimum |  |  |  |  |
Business Acquisition |  |  |  |  |
Useful life (in years) |  |  | 6 months |  |
Maximum |  |  |  |  |
Business Acquisition |  |  |  |  |
Useful life (in years) |  |  | 10 years |  |
Maximum | In-process research and development | Silicon IP and Business Protocols Business from Verimatrix |  |  |  |  |
Business Acquisition |  |  |  |  |
Useful life (in years) |  | 5 years |  |  |
[1] | For the Company’s lease commitments as of December 31, 2020, refer to Note 10, “Leases.”
[2] | The Company’s other contractual obligations as of December 31, 2020 were not material.
[3] | The above table does not reflect possible payments in connection with unrecognized tax benefits of approximately $25.5 million including $23.6 million recorded as a reduction of long-term deferred tax assets and $1.9 million in long-term income taxes payable, as of December 31, 2020. As noted below in Note 19, “Income Taxes,” although it is possible that some of the unrecognized tax benefits could be settled within the next 12 months, the Company cannot reasonably estimate the outcome at this time.
[4] | In connection with the acquisitions of Northwest Logic in August 2019 and the Secure Silicon IP and Protocols business in December 2019, the Company is obligated to pay retention bonuses to certain employees subject to certain eligibility and acceleration provisions including the condition of employment.

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