Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Contingencies (Details)

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Commitments and Contingencies - Contingencies (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended
Mar. 31, 2017
Aug. 31, 2016
Aug. 31, 2014
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2016
Loss Contingencies [Line Items]            
Provision for legal settlements       $ 516 $ 475  
Settled litigation | UMG Recordings            
Loss Contingencies [Line Items]            
Paid to American in settlement of lawsuit $ 5,000 $ 18,000        
Stock issued for legal settlements   1,800,000        
Pending Litigation | SwiftAir, LLC            
Loss Contingencies [Line Items]            
Damages sought     9      
Common Stock | UMG Recordings            
Loss Contingencies [Line Items]            
Stock issued during period, litigation (in shares)   1,800,000        
Price Per Share Scenario One | Common Stock | UMG Recordings            
Loss Contingencies [Line Items]            
Stock issued during period, litigation (in shares) 500,000 500,000.0        
Share Price (in usd per share) $ 10.00 $ 10     $ 10.00 $ 10
Price Per Share Scenario Two | Common Stock | UMG Recordings            
Loss Contingencies [Line Items]            
Stock issued during period, litigation (in shares) 400,000 400,000.0        
Share Price (in usd per share) $ 12.00 $ 12     $ 12.00 $ 12.00