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
Sep. 11, 2014
Jun. 17, 2014
Mar. 31, 2017
Oct. 31, 2016
Aug. 31, 2016
Aug. 31, 2014
Dec. 31, 2013
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2016
Class of Stock [Line Items]                            
Common shares issued in exchange for warrants (in shares)     12,682,755                      
Warrant to purchase convertible preferred stock (in shares)     4,227,187                 3,957,280    
Warrant exercise price (in dollars per share)     $ 11.50                      
Number of shares received in exchange for warrants     0.3333                      
Maximum number of warrants to be exchanged (in shares)     15,000,000                      
Gain (loss) on warrant exchange                         $ 800,000  
Issuance of shares for working capital settlement               $ 300,000     $ 0 $ 0 $ 345,000  
Common stock, par value (in dollars per share)       $ 0.0001             $ 0.0001 $ 0.0001    
Number of shares authorized for repurchase                           $ 50,000,000.0
Repurchase and retirement of common stock (in shares)                   600,000 600,000      
Repurchase and retirement of common stock                   $ 5,200,000 $ 5,219,000      
Remaining shares amount authorized repurchase amount                     44,800,000      
Unrecognized employee related stock-based compensation expnese                     $ 23,100,000      
Unrecognized employee related stock-based compensation expense, period for recognition (in years)                     2 years 8 months 11 days      
Twenty Thirteen Equity Incentive Plan [Member]                            
Class of Stock [Line Items]                            
Number of grants available (in shares)                     11,000,000      
Stock Options                            
Class of Stock [Line Items]                            
Shares issued (in shares)               28,161            
Stock Options | Twenty Thirteen Equity Incentive Plan [Member]                            
Class of Stock [Line Items]                            
Remaining stock-based awards available (in shares)                     1,859,792      
Stock Options | Twenty Thirteen Equity Incentive Plan [Member] | First Anniversary                            
Class of Stock [Line Items]                            
Percent of stock options vesting on the anniversary of commencement (as a percent)                 25.00%          
Stock Options | Twenty Thirteen Equity Incentive Plan [Member] | 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]                            
Shares issued (in shares)                         77,687  
Non-options granted (in shares)                     1,618,000      
Percent of stock options vesting on the anniversary of commencement (as a percent)                     25.00%      
Stock option term (in years)                     4 years      
Employment period following grant date for Performance Units (in years)                         1 year  
Granted (in dollars per share)                     $ 7.91      
Nonvested shares outstanding                     1,638,000 408,000    
Restricted stock units | Board of Directors                            
Class of Stock [Line Items]                            
Non-options granted (in shares)                     38,000 29,000    
Vesting period                     13 months 13 months    
Restricted stock units | Employees Excluding Board Of Directors                            
Class of Stock [Line Items]                            
Non-options granted (in shares)                     1,580,000 401,000    
Stock option term (in years)                       4 years    
PSUs                            
Class of Stock [Line Items]                            
Non-options granted (in shares)                     200,000      
Performance Period (in years)           3 years                
Granted (in dollars per share)                     $ 9.93      
Risk-free interest rate (as a percent)                     1.02%      
Nonvested shares outstanding                     200,000 0    
Common Stock                            
Class of Stock [Line Items]                            
Shares issued in period (in shares)                       1,337,760    
Common Stock Non-Voting                            
Class of Stock [Line Items]                            
Shares converted (in shares)       19,118,233                    
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              
Share Price (in usd per share)             $ 10       $ 10      
Common Stock | UMG Recordings | Price Per Share Scenario Two                            
Class of Stock [Line Items]                            
Shares issued in period (in shares)             400,000              
Share Price (in usd per share)             $ 12       $ 12      
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)   5,500,000                        
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 | Common Stock | UMG Recordings | Price Per Share Scenario One                            
Class of Stock [Line Items]                            
Shares issued in period (in shares)         500,000                  
Share Price (in usd per share)         $ 10.00                  
Subsequent Event | Common Stock | UMG Recordings | Price Per Share Scenario Two                            
Class of Stock [Line Items]                            
Shares issued in period (in shares)         400,000                  
Share Price (in usd per share)         $ 12.00                  
Subsequent Event | 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                          
Minimum | Stock Options | Twenty Thirteen Equity Incentive Plan [Member]                            
Class of Stock [Line Items]                            
Stock option term (in years)                     5 years      
Minimum | Stock Options | Board of Directors | Twenty Thirteen Equity Incentive Plan [Member]                            
Class of Stock [Line Items]                            
Stock option term (in years)                     5 years      
Maximum | Stock Options | Twenty Thirteen Equity Incentive Plan [Member]                            
Class of Stock [Line Items]                            
Stock option term (in years)                     7 years      
Maximum | Stock Options | Board of Directors | Twenty Thirteen Equity Incentive Plan [Member]                            
Class of Stock [Line Items]                            
Stock option term (in years)                     7 years