Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details)

v3.8.0.1
Summary of Significant Accounting Policies (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
shares
May 18, 2016
shares
Dec. 31, 2015
USD ($)
shares
Jan. 09, 2015
shares
Nov. 04, 2014
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
customer
shares
Nov. 03, 2014
shares
Goodwill impairment | $             $ 0 $ 0 $ 20,700,000  
Shares issued during period           85,761,332        
Basic WASO             181,772,000 152,103,000 102,504,000  
Potentially dilutive shares             1,374,000 749,000 494,000  
Diluted WASO             183,146,000 152,852,000 102,998,000  
Antidilutive shares excluded 0 17,000   3,000            
Series C common stock                    
Shares issued during period     78,250,042   17,277,224          
Accounting Standards Update 2016-09                    
Cumulative Effect of New Accounting Principle in Period of Adoption | $ $ 17,361,000           $ 17,361,000      
Excess Tax Benefit from Share-based Compensation, Operating Activities | $               $ 0 $ 1,200,000  
Accounting Standards Update 2016-09 | Retained earnings                    
Cumulative Effect of New Accounting Principle in Period of Adoption | $ $ 17,361,000     $ 0     $ 17,361,000   $ 0  
Minimum                    
Property estimated useful life             3 years      
Maximum                    
Property estimated useful life             5 years 6 months      
Skyhook | Revenue | Customer concentration                    
Number of major customers | customer                 1  
Skyhook | Significant customer                    
Deferred revenue | $       $ 35,500,000         $ 35,500,000  
Skyhook | Significant customer | Revenue | Customer concentration                    
Customer concentration (as a percent)             57.00% 57.00% 85.00%  
Awards                    
Number of awards outstanding (in shares)                   0