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Acquisitions Acquisition (Additional Information) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 08, 2019
Dec. 31, 2019
Dec. 31, 2018
Aug. 23, 2019
Business Acquisition [Line Items]        
Contractual obligation [1],[2]   $ 222,804    
Northwest Logic        
Business Acquisition [Line Items]        
Acquisition-related costs   700    
Silicon IP and Business Protocols Business from Verimatrix        
Business Acquisition [Line Items]        
Acquisition-related costs $ 3,100      
Goodwill expected to be tax deductible 15,000      
Retention bonus liability        
Business Acquisition [Line Items]        
Contractual obligation [1],[2],[3]   9,998    
Retention bonus liability | Northwest Logic        
Business Acquisition [Line Items]        
Contractual obligation   3,000   $ 9,000
Retention bonus liability | Silicon IP and Business Protocols Business from Verimatrix        
Business Acquisition [Line Items]        
Contractual obligation $ 1,000 $ 500    
Minimum        
Business Acquisition [Line Items]        
Useful life (in years)   6 months 1 year  
Minimum | In-process research and development | Silicon IP and Business Protocols Business from Verimatrix        
Business Acquisition [Line Items]        
Useful life (in years) 3 years      
Maximum        
Business Acquisition [Line Items]        
Useful life (in years)   10 years 10 years  
Maximum | In-process research and development | Silicon IP and Business Protocols Business from Verimatrix        
Business Acquisition [Line Items]        
Useful life (in years) 5 years      
[1]
For the Company’s lease commitments as of December 31, 2019, refer to Note 10, “Leases.”
[2]
The above table does not reflect possible payments in connection with unrecognized tax benefits of approximately $24.6 million including $22.8 million recorded as a reduction of long-term deferred tax assets and $1.8 million in long-term income taxes payable, as of December 31, 2019. 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.
[3]
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.