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Joint Ventures - Additional Information (Detail)
shares in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
USD ($)
shares
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Project
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Apr. 27, 2017
Oct. 31, 2016
Dec. 31, 2012
USD ($)
Schedule of Equity Method Investments [Line Items]                  
Equity in net income/(loss) of joint venture       $ 0 $ 700,000 $ 100,000      
Impairment charge       7,000,000          
Investment in DreamPlay LLC         7,000,000        
Net income (loss) attributable to non-controlling interests       $ 57,000 6,000 $ (84,000)      
Pacific Animation Partners Joint Venture                  
Schedule of Equity Method Investments [Line Items]                  
Percentage of ownership interest in joint venture       50.00%          
Number of episodes for which production completed | Project       65          
Episode show airing beginning date       2012-02          
DreamPlay Toys                  
Schedule of Equity Method Investments [Line Items]                  
Percentage of ownership interest in joint venture 50.00%                
Cash paid to Nant Works for joint venture $ 8,000,000                
Impairment charge     $ 7,000,000            
Issue of warrants (in shares) | shares 1.5                
Issue of warrants $ 7,000,000                
Investment in DreamPlay LLC                 $ 7,000,000
Percentage of ownership interest in joint venture                 5.00%
DreamPlay Toys | Technology Rights                  
Schedule of Equity Method Investments [Line Items]                  
Impairment charge   $ 2,900,000              
China Joint Venture                  
Schedule of Equity Method Investments [Line Items]                  
Percentage of ownership interest in joint venture       51.00%          
Net income (loss) attributable to non-controlling interests       $ 57,000 $ 6,000        
Hong Kong Meisheng Cultural Co                  
Schedule of Equity Method Investments [Line Items]                  
Percentage of ownership interest in joint venture               50.00%  
Net income (loss) attributable to non-controlling interests       $ 0          
Hong Kong Meisheng Cultural Co | Minimum                  
Schedule of Equity Method Investments [Line Items]                  
Ownership percentage             10.00%