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 9 Months Ended
Oct. 04, 2018
Mar. 31, 2017
Aug. 31, 2016
Aug. 31, 2014
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Loss Contingencies [Line Items]                
Provision for legal settlements         $ (509) $ 310 $ (134) $ 785
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        
Price Per Share Scenario One | Common Stock | UMG Recordings                
Loss Contingencies [Line Items]                
Stock issued during period, litigation (in shares)   500,000            
Share Price (in usd per share)           $ 10.00   $ 10.00
Price Per Share Scenario Two | Common Stock | UMG Recordings                
Loss Contingencies [Line Items]                
Stock issued during period, litigation (in shares)   400,000            
Share Price (in usd per share)           $ 12.00   $ 12.00
Subsequent Event | Settled litigation | Securities Class Action Lawsuit                
Loss Contingencies [Line Items]                
Settlement to be paid $ 1,100