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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, 2018 USD ($) | Dec. 31, 2018 USD ($) project | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Apr. 27, 2017 | Oct. 31, 2016 | Dec. 31, 2012 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Write-off of investment in DreamPlay, LLC |  |  |  | $ 0 | $ 7,000,000 | $ 0 |  |  |
Net income (loss) attributable to non-controlling interests |  |  |  | $ (57,000) | 57,000 | 6,000 |  |  |
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 |  |  |  |  |
Equity in net income/(loss) of joint venture |  |  |  | $ 22,000 | 16,000 | 700,000 |  |  |
Joint venture balance |  |  |  | $ 0 | 0 | 0 |  |  |
DreamPlay Toys |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Percentage of ownership interest in joint venture | 50.00% |  |  |  |  |  |  |  |
Cash paid to acquire interest in joint venture | $ 8,000,000 |  |  |  |  |  |  |  |
DreamPlay, LLC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Percentage of ownership interest in joint venture |  |  |  |  |  |  |  |  | 5.00%
Cash paid to acquire interest in joint venture | $ 7,000,000 |  |  |  |  |  |  |  |
Write-off of investment in DreamPlay, LLC |  |  | $ 7,000,000 |  |  |  |  |  |
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) | 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 | $ 0 |  |  |  |
Technology Rights | DreamPlay Toys |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Write-off of investment in DreamPlay, LLC |  | $ 2,900,000 |  |  |  |  |  |  |
Minimum | Hong Kong Meisheng Cultural Co |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  | 10.00% |  |
NantWorks | DreamPlay Toys |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Issue of warrants (in shares) | shares | 1.5 |  |  |  |  |  |  |  |
Value of warrants issued |  |  |  |  |  |  |  |  | $ 7,000,000

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