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Contingencies - Litigation (Details)
Sep. 14, 2018
number_patents
Petition
Feb. 28, 2018
number_patents
Sep. 15, 2017
number_patents
Mar. 28, 2016
number_patents
Sep. 30, 2019
USD ($)
Loss Contingencies [Line Items]          
Loss contingencies, patents allegedly infringed, number of inter partes review requested | Petition 2        
Loss contingency accrual | $         $ 0
AgaMatrix          
Loss Contingencies [Line Items]          
Loss contingency, patents allegedly infringed, number       3  
Loss contingencies, patents allegedly infringed, number of inter partes review requested 2        
WaveForm Technologies, Inc.          
Loss Contingencies [Line Items]          
Loss contingency, patents allegedly infringed, number transferred to new plaintiff       3  
Loss contingencies, patents allegedly infringed, number of inter partes review requested   2      
AgaMatrix          
Loss Contingencies [Line Items]          
Gain contingency, patents allegedly infringed upon, number     2