Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Fair Value Measurements, Recurring and Nonrecurring (Details) (Details)

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Basis of Presentation and Summary of Significant Accounting Policies - Fair Value Measurements, Recurring and Nonrecurring (Details) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended
Mar. 31, 2017
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Earn-out liability   $ 114 $ 114  
Contingently issuable shares   1,755 1,448  
Phantom stock options   1,240    
Total financial liabilities   3,109 1,582  
Public SPAC Warrants        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Public SPAC warrants     20  
Quotes prices in active markets (Level 1)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Earn-out liability   0 0  
Contingently issuable shares   0 0  
Phantom stock options   0    
Total financial liabilities   0 $ 0  
Quotes prices in active markets (Level 1) | Global Eagle Warrants | Public SPAC Warrants        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Number of warrants (in shares)     6,173,228  
Quotes prices in active markets (Level 1) | Public SPAC Warrants        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Public SPAC warrants     $ 0  
Significant other observable inputs (Level 2)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Earn-out liability   0 0  
Contingently issuable shares   0 0  
Phantom stock options   0    
Total financial liabilities   0 0  
Significant other observable inputs (Level 2) | Public SPAC Warrants        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Public SPAC warrants     0  
Significant other unobservable inputs (Level 3)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Earn-out liability   114 114  
Contingently issuable shares   1,755 1,448  
Phantom stock options   1,240    
Total financial liabilities   $ 3,109 1,582  
Significant other unobservable inputs (Level 3) | Public SPAC Warrants        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Public SPAC warrants     $ 20  
Price Per Share Scenario One | Common Stock | UMG Recordings        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Stock issued during period, litigation (in shares) 500,000      
Share price of common stock (in usd per share)       $ 10.00
Price Per Share Scenario Two | Common Stock | UMG Recordings        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Stock issued during period, litigation (in shares) 400,000      
Share price of common stock (in usd per share)       $ 12.00