Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) - Skyhook
$ in Millions
9 Months Ended 12 Months Ended
Mar. 27, 2015
USD ($)
Mar. 05, 2015
Oct. 15, 2015
USD ($)
Dec. 31, 2015
USD ($)
Sep. 10, 2010
item
Patent infringement lawsuit          
General Litigation          
Number of claims | item         8
Number of days before action is reopened   45 days      
Litigation settlement amount $ 90.0        
Covenant not to sue period 3 years        
Legal Fees       $ 29.5  
Polaris patent infringement lawsuit          
General Litigation          
Loss Contingency, Damages Sought, Value     $ 3.0