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Related Party Transactions (Details) - USD ($)	1 Months Ended		3 Months Ended		9 Months Ended		10 Months Ended	12 Months Ended
Related Party Transactions (Details) - USD ($)	Jul. 31, 2018	Mar. 31, 2017	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 29, 2019	Aug. 31, 2019	Jul. 26, 2018	Aug. 31, 2017	Jul. 31, 2013
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Proceeds from Issuance of Long-term Debt					0	27,356,000
Paid-in-Kind Interest					3,370,000	624,000
4.25% Convertible Senior Notes (due 2018) [Member]
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Debt Instrument, Interest Rate, Stated Percentage																4.25%	4.25%
Debt Conversion, Converted Instrument, Amount	$ 8,000,000.0
Debt Instrument, Interest Rate, Stated Percentage, Paid In Cash															3.25%
Debt Instrument, Interest Rate, Stated Percentage, Paid In Stock															5.00%
Debt Instrument, Interest Rate, Stated Percentage, Paid In Kind															2.75%
Secured Debt [Member] \| New Term Loan Agreement [Member]
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Debt Instrument, Interest Rate, Stated Percentage, Paid In Cash														8.00%
Debt Instrument, Interest Rate, Stated Percentage, Paid In Kind														2.50%
Paid-in-Kind Interest					4,000,000.0
Owner Of Nant Works [Member] \| JAKKS Pacific [Member]
Related Party Transactions (Details) [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners													5.00%
Former Director [Member]
Related Party Transactions (Details) [Line Items]
Legal Fees				700,000		1,300,000
Accrued Professional Fees								$ 100,000
Nant Works [Member]
Related Party Transactions (Details) [Line Items]
Accounts Payable, Related Parties
Accounts Receivable, Related Parties
Operating Lease, Expense
Nant Works [Member] \| Renewal Fee [Member]
Related Party Transactions (Details) [Line Items]
Related Party Transaction, Amounts of Transaction										$ 200,000	$ 200,000	$ 1,200,000
Payment to Related Parties												$ 800,000
Joint Venture With Meisheng Cultural & Creative Corp. [Member]
Related Party Transactions (Details) [Line Items]
Equity Method Investment, Ownership Percentage			51.00%		51.00%
Income (Loss) from Equity Method Investments			$ 49,000	(31,000)	$ 97,000	57,000
Joint Venture With Hong Kong Meisheng Cultural Company Limited [Member]
Related Party Transactions (Details) [Line Items]
Equity Method Investment, Ownership Percentage			50.00%		50.00%
Income (Loss) from Equity Method Investments
Joint Venture With Hong Kong Meisheng Cultural Company Limited [Member] \| JAKKS Pacific [Member]
Related Party Transactions (Details) [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners			10.00%		10.00%
Hong Kong Affiliate [Member]
Related Party Transactions (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)		366,089
Share-Based Compensation Arrangement By Share-Based Payment Award, Value Of Shares Authorized		$ 19,300,000
Hong Kong Meisheng Cultural Company Limited [Member] \| Inventory Related Payments [Member]
Related Party Transactions (Details) [Line Items]
Related Party Transaction, Amounts of Transaction			$ 31,400,000	$ 49,600,000	$ 54,400,000	$ 74,800,000
Due to Related Parties			$ 22,100,000		22,100,000			$ 18,100,000
Benefit Street Partners [Member] \| Secured Debt [Member] \| New Term Loan Agreement [Member]
Related Party Transactions (Details) [Line Items]
Proceeds from Issuance of Long-term Debt					68,000,000.0
Paid-in-Kind Interest					1,900,000
Axar Capital Management [Member] \| Secured Debt [Member] \| New Term Loan Agreement [Member]
Related Party Transactions (Details) [Line Items]
Proceeds from Issuance of Long-term Debt					27,100,000
Paid-in-Kind Interest					$ 800,000
Share-based Payment Arrangement, Nonemployee [Member] \| Restricted Stock [Member]
Related Party Transactions (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted (in Shares)							1,332	5,471	4,158
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture							$ 100,000	$ 100,000	$ 100,000