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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.