Summary of Significant Accounting Policies - Additional Information (Detail)		3 Months Ended	12 Months Ended
	Mar. 14, 2019	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) Entity	Dec. 31, 2019 USD ($)
Significant Accounting Policies [Line Items]
Number of consolidated joint ventures | Entity			12
Accumulated deficit		$ (427,126,000)	$ (435,562,000)	$ (427,126,000)
Net loss			(7,336,000)	(109,522,000)
Stock split, conversion ratio	0.10
Reverse stock split	1-for-10 reverse stock split
Earnings in foreign subsidiaries			0
Allowance for doubtful accounts		14,300,000	6,500,000	14,300,000
Derivative instruments, fair value		0	0	0
Impairment of equity method investment			19,607,000	26,613,000
Impairment of goodwill			0	0
Impairment of intangible assets, indefinite-lived			35,053,000	65,587,000
Advertising expenses			$ 5,500,000	13,700,000
Marcy Media Holdings, LLC
Significant Accounting Policies [Line Items]
Impairment of equity method investment				17,000,000
Marcy Media Holdings, LLC | Carter Parties Settlement
Significant Accounting Policies [Line Items]
Impairment of equity method investment				17,000,000
MG Icon
Significant Accounting Policies [Line Items]
Impairment of equity method investment		$ 9,600,000		9,600,000
Write off of advances made to the entity				$ 2,600,000
Minimum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life			3 years
Finite-lived intangible assets, useful life			1 year
Maximum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life			7 years
Finite-lived intangible assets, useful life			15 years
Sales Revenue, Services, Net | Customer One | Customer Concentration Risk
Significant Accounting Policies [Line Items]
Concentration risk, percentage			10.00%	12.00%
Sales Revenue, Services, Net | Customer Two | Customer Concentration Risk
Significant Accounting Policies [Line Items]
Concentration risk, percentage				11.00%
Accounts Receivable | Customer One | Customer Concentration Risk
Significant Accounting Policies [Line Items]
Concentration risk, percentage			10.00%	16.00%
China | Ecko Mark/Ecko and Candies Joint Venture
Significant Accounting Policies [Line Items]
Impairment of equity method investment			$ 19,600,000
Subsidiaries | Non U.S
Significant Accounting Policies [Line Items]
Cash including restricted cash			$ 15,000,000
Percentage of cash including restricted cash held in foreign subsidiaries			25.00%
Earnings in foreign subsidiaries			$ 0
Novel Corona Virus Adverse Impact
Significant Accounting Policies [Line Items]
Accumulated deficit			(435,600,000)
Net loss			$ (3,000,000)	$ (99,900,000)