Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Contingencies (Details)

v3.10.0.1
Commitments and Contingencies - Contingencies (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2017
Aug. 31, 2016
Aug. 31, 2014
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2016
Loss Contingencies [Line Items]                
Provision for legal settlements       $ (141) $ 0 $ 375 $ 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     $ 10.00   $ 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     $ 12.00   $ 12.00 $ 12.00