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 6 Months Ended 12 Months Ended
Mar. 31, 2017
Aug. 31, 2016
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Earn-out liability         $ 114 $ 114
Contingently issuable shares         1,559 1,448
Total financial liabilities         1,673 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
Total financial liabilities         0 $ 0
Quotes prices in active markets (Level 1) | 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) | 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
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         1,559 1,448
Total financial liabilities         $ 1,673 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
Common Stock | UMG Recordings            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Stock issued during period, litigation (in shares)   1,800,000        
Price Per Share Scenario One | Common Stock | UMG Recordings - share price threshold            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Stock issued during period, litigation (in shares)     500,000 500,000.0    
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) 500,000 500,000.0        
Share price of common stock (in usd per share)   $ 10 $ 10.00 $ 10    
Price Per Share Scenario Two | Common Stock | UMG Recordings - share price threshold            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Stock issued during period, litigation (in shares)     400,000 400,000.0    
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) 400,000 400,000.0        
Share price of common stock (in usd per share)   $ 12 $ 12.00 $ 12.00