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)

v3.5.0.2
Basis of Presentation and Summary of Significant Accounting Policies - Fair Value Measurements, Recurring and Nonrecurring (Details) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Earn-out liability $ 4,162 $ 9,652
Contingently issuable shares 6,276  
Total financial liabilities $ 16,673 33,728
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) 900,000  
2015 Business Combinations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Earn-out liability $ 4,200 9,700
Public SPAC Warrants    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Public SPAC warrants 6,235 24,076
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  
Total financial liabilities $ 6,235 $ 24,076
Quotes prices in active markets (Level 1) | Public warrants    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Number of warrants (in shares) 6,173,228 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 $ 6,235 $ 24,076
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  
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 0
Significant other unobservable inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Earn-out liability 4,162 9,652
Contingently issuable shares 6,276  
Total financial liabilities 10,438 9,652
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 $ 0 $ 0