Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details)

v3.6.0.2
Summary of Significant Accounting Policies (Details)
 1 Months Ended 12 Months Ended
May 18, 2016
shares
Dec. 31, 2015
USD ($)
shares
Jan. 09, 2015
shares
Dec. 31, 2014
shares
Nov. 04, 2014
shares
Dec. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
customer
shares
Dec. 31, 2014
USD ($)
shares
Nov. 03, 2014
shares
Restricted cash             $ 32,000      
Property and equipment, gross   $ 26,051,000       $ 26,051,000 9,030,000 $ 26,051,000    
Accumulated depreciation   (24,803,000)       (24,803,000) (8,320,000) (24,803,000)    
Property and equipment, net   1,248,000       1,248,000 $ 710,000 1,248,000    
Investments, at fair value   439,560,000       439,560,000   439,560,000    
AFS Fair Value Option   438,900,000       438,900,000   438,900,000    
Share price target duration for AFS securities             12 months      
AFS impairment charge             $ 0 0 $ 0  
Goodwill impairment             0      
Impairment of long-lived assets             0 0 $ 16,800,000  
Deferred revenue   $ 2,443,000       2,443,000 $ 2,596,000 $ 2,443,000    
Shares issued during period | shares         85,761,332     85,761,332    
Basic WASO | shares             152,103,000 102,504,000 88,143,000  
Potentially dilutive shares | shares             749,000 494,000 630,000  
Diluted WASO | shares             152,852,000 102,998,000 88,773,000  
Antidilutive shares excluded | shares   3,000   17,000     17,000      
Series C                    
Shares issued during period | shares 78,250,042   17,277,224              
Accounting Standards Update 2016-09                    
Excess Tax Benefit from Share-based Compensation, Operating Activities             $ 0 $ 1,200,000 $ 0  
Accounting Standards Update 2016-09 | Retained earnings (accumulated) deficit                    
Cumulative Effect of New Accounting Principle in Period of Adoption   $ 0       0   0    
Minimum                    
Useful life             3 years      
Maximum                    
Useful life             5 years 6 months      
Support equipment                    
Property and equipment, gross   21,769,000       21,769,000 $ 5,177,000 21,769,000    
Property estimated useful life             5 years      
Computer equipment                    
Property and equipment, gross   2,257,000       2,257,000 $ 2,040,000 2,257,000    
Property estimated useful life             3 years      
Furniture & fixtures                    
Property and equipment, gross   2,025,000       2,025,000 $ 1,813,000 2,025,000    
Property estimated useful life             5 years      
Skyhook                    
Goodwill impairment           20,700,000   $ 20,669,000 $ 18,434,000  
Skyhook | Revenue | Customer concentration                    
Number of major customers | customer               1    
Skyhook | Significant customer                    
Deferred revenue   $ 35,500,000       35,500,000   $ 35,500,000    
Skyhook | Significant customer | Revenue | Customer concentration                    
Customer concentration (as a percent)   85.00%             83.00%  
Awards                    
Number of awards outstanding (in shares) | shares                   0
Time Warner Cable                    
Investments, at fair value   $ 438,912,000       $ 438,912,000   $ 438,912,000