Annual report pursuant to Section 13 and 15(d)

Common Stock, Stock-Based Awards and Warrants - Narrative (Details)

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Common Stock, Stock-Based Awards and Warrants - Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Jul. 27, 2017
Jul. 27, 2016
Mar. 31, 2017
Oct. 31, 2016
Aug. 31, 2016
Dec. 31, 2013
Jun. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 18, 2018
Dec. 21, 2017
Sep. 30, 2017
Mar. 31, 2016
Class of Stock [Line Items]                            
Warrant to purchase convertible preferred stock (in shares)                   3,957,280        
Common stock, par value (in dollars per share)               $ 0.0001 $ 0.0001          
Number of shares authorized for repurchase                           $ 50,000,000
Repurchase and retirement of common stock (in shares)             600,000 0 600,000          
Repurchase of common stock                 $ 5,200,000          
Repurchase and retirement of common stock             $ 5,200,000              
Remaining shares amount authorized repurchase amount               $ 44,800,000            
Unrecognized employee related stock-based compensation expnese               $ 29,600,000            
Unrecognized employee related stock-based compensation expense, period for recognition (in years)               2 years 9 months 7 days            
2017 Equity Incentive Plan                            
Class of Stock [Line Items]                            
Number of grants available (in shares)                       6,500,000    
2013 Equity Incentive Plan                            
Class of Stock [Line Items]                            
Number of grants available (in shares)                 11,000,000          
Stock Options | 2013 Equity Incentive Plan                            
Class of Stock [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value               $ 0 $ 0 $ 2,500,000        
Remaining stock-based awards available (in shares)                       2,097,846    
Stock Options | 2013 Equity Incentive Plan | First Anniversary                            
Class of Stock [Line Items]                            
Percent of stock options vesting on the anniversary of commencement (as a percent)           25.00%                
Stock Options | 2013 Equity Incentive Plan | After First Anniversary                            
Class of Stock [Line Items]                            
Percent of stock options vesting on the anniversary of commencement (as a percent)           2.083%                
Vesting period               4 years            
Restricted stock units                            
Class of Stock [Line Items]                            
Non-options granted (in shares)               3,911,000            
Percent of stock options vesting on the anniversary of commencement (as a percent)               25.00%            
Stock option term (in years)               4 years            
Granted (in dollars per share)               $ 2.67            
Nonvested shares outstanding               4,591,000 1,638,000          
Restricted stock units | Board of Directors                            
Class of Stock [Line Items]                            
Non-options granted (in shares)               268,000 38,000          
Vesting period               13 months 13 months          
Restricted stock units | Employees Excluding Board Of Directors                            
Class of Stock [Line Items]                            
Non-options granted (in shares)               3,643,000 1,580,000          
Stock option term (in years)                 4 years          
PSUs                            
Class of Stock [Line Items]                            
Non-options granted (in shares)               526,100.000 235,188          
Performance Period (in years)       3 years                    
Granted (in dollars per share)               $ 2.81 $ 9.93          
Risk-free interest rate (as a percent)               1.89% 1.02%          
Nonvested shares outstanding               683,320.00 235,188.000 0        
Common Stock                            
Class of Stock [Line Items]                            
Shares issued in period (in shares)                   1,337,760        
Common Stock                            
Class of Stock [Line Items]                            
Issuance of common stock for Emerging Markets Communication Acquisition (in shares)                 5,467,000          
Repurchase and retirement of common stock (in shares)                 614,000          
Common Stock | UMG Recordings                            
Class of Stock [Line Items]                            
Shares issued in period (in shares)         1,800,000                  
Common Stock | UMG Recordings | Price Per Share Scenario One                            
Class of Stock [Line Items]                            
Shares issued in period (in shares)     500,000   500,000.0                  
Share Price (in usd per share)     $ 10.00   $ 10     $ 10         $ 10.00  
Common Stock | UMG Recordings | Price Per Share Scenario Two                            
Class of Stock [Line Items]                            
Shares issued in period (in shares)     400,000   400,000.0                  
Share Price (in usd per share)     $ 12.00   $ 12     $ 12         $ 12.00  
Emerging Markets Communications LLC                            
Class of Stock [Line Items]                            
Business combination, additional consideration payable, percent payable at fixed rate   50.00%                        
Business combination, additional consideration payable, portion payable at fixed rate, price per share   $ 8.40                        
Business combination, additional consideration payable, percent payable at variable rate   50.00%                        
Business combination, additional consideration payable, portion at variable rate, measurement period prior to anniversary date   2 days                        
Deferred compensation to be paid   $ 25,000,000                        
Emerging Markets Communications LLC | President | 2016 Inducement And Retention Stock Plan For EMC Employees | Share-based Compensation Award, Tranche Two                            
Class of Stock [Line Items]                            
Vesting period   2 years                        
Emerging Markets Communications LLC | EMC Employees | 2016 Inducement And Retention Stock Plan For EMC Employees | Share-based Compensation Award, Tranche Two                            
Class of Stock [Line Items]                            
Vesting period   3 years                        
Emerging Markets Communications LLC | Stock Options | President | 2016 Inducement And Retention Stock Plan For EMC Employees                            
Class of Stock [Line Items]                            
Options granted (in shares)   450,000                        
Emerging Markets Communications LLC | Stock Options | EMC Employees | 2016 Inducement And Retention Stock Plan For EMC Employees                            
Class of Stock [Line Items]                            
Options granted (in shares)   72,600                        
Emerging Markets Communications LLC | Restricted stock units | President | 2016 Inducement And Retention Stock Plan For EMC Employees                            
Class of Stock [Line Items]                            
Non-options granted (in shares)   275,000                        
Emerging Markets Communications LLC | Restricted stock units | EMC Employees | 2016 Inducement And Retention Stock Plan For EMC Employees                            
Class of Stock [Line Items]                            
Non-options granted (in shares)   73,750                        
Emerging Markets Communications LLC | Restricted Stock | President | 2016 Inducement And Retention Stock Plan For EMC Employees                            
Class of Stock [Line Items]                            
Non-options granted (in shares)   175,000                        
Emerging Markets Communications LLC | Common Stock                            
Class of Stock [Line Items]                            
Issuance of common stock for Emerging Markets Communication Acquisition (in shares) 5,000,000 5,500,000                        
Row 44, Inc.                            
Class of Stock [Line Items]                            
Common shares issued in exchange for warrants (in shares)                   257,058        
Warrant to purchase convertible preferred stock (in shares)                   93,161        
Subsequent Event | 2013 Equity Incentive Plan                            
Class of Stock [Line Items]                            
Vested and expected to vest (in shares)                     7,070,298      
Minimum | Stock Options | 2013 Equity Incentive Plan                            
Class of Stock [Line Items]                            
Stock option term (in years)               5 years            
Minimum | Stock Options | Board of Directors | 2013 Equity Incentive Plan                            
Class of Stock [Line Items]                            
Stock option term (in years)               5 years            
Maximum | Stock Options | 2013 Equity Incentive Plan                            
Class of Stock [Line Items]                            
Stock option term (in years)               7 years            
Maximum | Stock Options | Board of Directors | 2013 Equity Incentive Plan                            
Class of Stock [Line Items]                            
Stock option term (in years)               7 years