Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) - Skyhook
 1 Months Ended 9 Months Ended 12 Months Ended
Mar. 27, 2015
USD ($)
Oct. 31, 2015
USD ($)
Oct. 15, 2015
USD ($)
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Sep. 10, 2010
item
Patent infringement lawsuit            
General Litigation            
Number of claims | item           8
Litigation settlement amount $ 90,000,000          
Legal Fees         $ 29,500,000  
Polaris patent infringement lawsuit            
General Litigation            
Loss Contingency, Damages Sought, Value     $ 3,000,000      
Indemnification claim            
General Litigation            
Number of claims | item       4    
Loss Contingency Accrual       $ 0 $ 0  
T-Mobile | Indemnification claim            
General Litigation            
Number of claims | item       2    
AT&T | Indemnification claim            
General Litigation            
Loss Contingency, Damages Sought, Value       $ 132,000    
Number of claims | item       4    
Maximum estimated allocation       $ 132,000    
Payments for Legal Settlements   $ 55,000