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Contingencies (Details)
Mar. 18, 2019
claim
patent
Feb. 21, 2019
patent
Jul. 02, 2018
claim
patent
entity
Advanced Micro Devices, Inc. Shareholder Derivative Litigation      
Loss Contingencies [Line Items]      
Number of putative class action complaints filed | claim 2    
MediaTek Litigation      
Loss Contingencies [Line Items]      
Number of putative class action complaints filed | claim 4    
Patents allegedly infringed, number 1 6  
Quarterhill Inc. Litigation      
Loss Contingencies [Line Items]      
Number of putative class action complaints filed | claim     3
Number of entities filing complaints | entity     3
Quarterhill Inc. Litigation, Aquila Innovations Inc.      
Loss Contingencies [Line Items]      
Patents allegedly infringed, number     2
Quarterhill Inc. Litigation, Collabo Innovations, Inc.      
Loss Contingencies [Line Items]      
Patents allegedly infringed, number     1
Quarterhill Inc. Litigation, Polaris Innovations Ltd.      
Loss Contingencies [Line Items]      
Patents allegedly infringed, number     2