Joint Ventures - Additional Information (Detail) shares in Millions	1 Months Ended	3 Months Ended			6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2012 USD ($) shares	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) project	Sep. 30, 2018 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2018 USD ($)	Oct. 31, 2016
Schedule of Equity Method Investments [Line Items]
Net income (loss) attributable to non-controlling interests		$ (31,000)	$ 17,000			$ 57,000	$ 39,000
Pacific Animation Partners Joint Venture
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		50.00%				50.00%
Number of episodes for which production completed | project						65
Equity in net income/(loss) of joint venture		$ 0	0			$ 0
Equity method investments		0				0			$ 0
DreamPlay Toys
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%
Cash paid to Nant Works for joint venture	$ 8,000,000
DreamPlay Toys | Technology Rights
Schedule of Equity Method Investments [Line Items]
Impairment charge				$ 2,900,000
DreamPlay, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage								5.00%
Cash paid to Nant Works for joint venture								$ 7,000,000
Impairment charge				$ 7,000,000				$ 7,000,000
Joint Venture With Meisheng Culture & Creative Corp.
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage									51.00%
Net income (loss) attributable to non-controlling interests		(31,000)	39,000			57,000	17,000
Hong Kong Meisheng Cultural Co
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage										50.00%
Net income (loss) attributable to non-controlling interests		$ 0	0		$ 0	$ 0	0
Hong Kong Meisheng Cultural Co | Minimum
Schedule of Equity Method Investments [Line Items]
Ownership percentage		10.00%				10.00%
NantWorks | DreamPlay Toys
Schedule of Equity Method Investments [Line Items]
Issue of warrants (in shares) | shares	1.5
Investment in DreamPlay LLC	$ 7,000,000
Affiliated Entity | Hong Kong Meisheng Cultural Co
Schedule of Equity Method Investments [Line Items]
Purchases from related party		$ 49,600,000	19,800,000			$ 74,800,000	33,900,000
Due to related parties		$ 40,900,000	18,200,000			$ 40,900,000	18,200,000
Video Games
Schedule of Equity Method Investments [Line Items]
Equity in net income/(loss) of joint venture			$ 0				$ 200,000