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Rhapsody Joint Venture (Additional Information) (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2010
Sep. 30, 2018
Sep. 30, 2017
Nov. 30, 2017
Dec. 01, 2016
Schedule of Equity Method Investments [Line Items]                  
Losses recorded in the operations of Rhapsody     $ 737,000 $ 0   $ 737,000 $ 1,097,000    
Advance to Rhapsody           $ 0 1,500,000    
Rhapsody America LLC                  
Schedule of Equity Method Investments [Line Items]                  
Percentage of ownership interest in Rhapsody     42.00%     42.00%      
Payments for restructuring         $ 18,000,000        
Liquidation preference amount     $ 10,000,000.0     $ 10,000,000.0      
Losses recorded in the operations of Rhapsody     700,000 $ 0     $ (1,100,000)    
Carrying value     0     0      
Loan principal to related party                 $ 5,000,000.0
Advance to Rhapsody $ 1,500,000 $ 3,500,000              
Related party loan rate   10.00%              
Line of Credit [Member]                  
Schedule of Equity Method Investments [Line Items]                  
Guarantor Obligations, Maximum Exposure, Undiscounted     $ 2,750,000     $ 2,750,000   $ 2,750,000