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)

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Basis of Presentation and Summary of Significant Accounting Policies - Fair Value Measurements, Recurring and Nonrecurring (Details) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Amortization of intangible assets $ 7,486,000 $ 6,005,000 $ 14,889,000 $ 11,988,000  
Earn-out liability 6,565,000   6,565,000   $ 9,652,000
Total financial liabilities 13,849,000   13,849,000   33,728,000
2015 Business Combinations          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Earn-out liability 6,600,000   6,600,000   9,700,000
Public SPAC Warrants          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Public SPAC warrants 7,284,000   7,284,000   24,076,000
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   0
Total financial liabilities $ 7,284,000   $ 7,284,000   $ 24,076,000
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   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 $ 7,284,000   $ 7,284,000   $ 24,076,000
Significant other observable inputs (Level 2)          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Earn-out liability 0   0   0
Total financial liabilities 0   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   0
Significant other unobservable inputs (Level 3)          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Earn-out liability 6,565,000   6,565,000   9,652,000
Total financial liabilities 6,565,000   6,565,000   9,652,000
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   $ 0
Cost of sales | Content          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Amortization of intangible assets $ 0   $ 0 $ 100,000