Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Legal Matters (Details)

v3.8.0.1
Commitments and Contingencies - Legal Matters (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2017
Aug. 31, 2016
Apr. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Loss Contingencies [Line Items]              
Provision for legal settlements       $ 310 $ 1,545 $ 785 $ 41,688
STM Sellers              
Loss Contingencies [Line Items]              
Loss contingency, damages sought by STM Sellers     $ 20,000        
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          
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   $ 10.00  
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