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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2017
Feb. 28, 2015
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Financial assets fair value     $ 41,677   $ 41,677   $ 63,364
Expected life     3 years 9 months 18 days 3 years 8 months 12 days 3 years 10 months 25 days 4 years 2 months 12 days  
Volatility     35.00% 34.00% 35.00% 35.00%  
Warrants issued by Rhapsody | Related Party Debt Obligation              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Increase in expected term         3 years 3 months    
Total expected term for warrant         8 years 3 months    
Warrants issued by Rhapsody | Related Party Debt Obligation | Rhapsody America LLC              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Financial assets fair value $ 500 $ 1,200          
Expected life 5 years 5 years          
Volatility 55.00% 55.00%          
Warrants Issued To Purchase Napster | Related Party Debt Obligation              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Increase in expected term         1 year    
Total expected term for warrant         6 years