Summary of Significant Accounting Policies - Additional Information (Detail)		3 Months Ended			12 Months Ended
	Mar. 14, 2019	Dec. 31, 2019 USD ($) Entity	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2019 USD ($) Entity $ / shares	Dec. 31, 2018 USD ($) $ / shares	Jan. 01, 2019 USD ($)	Sep. 30, 2017
Significant Accounting Policies [Line Items]
Number of consolidated joint ventures | Entity		14			14
Accumulated deficit		$ (429,117,000)	$ (312,796,000)		$ (429,117,000)	$ (312,796,000)
Net loss					(111,513,000)	(100,521,000)
Stock split, conversion ratio	0.10
Reverse stock split	1-for-10 reverse stock split
Earnings in foreign subsidiaries		0			0
Allowance for doubtful accounts		$ 14,300,000	20,100,000		$ 14,300,000	20,100,000
Debt instrument, interest rate, stated percentage		5.75%			5.75%
Derivative instruments, fair value		$ 0	0		$ 0	0
Impairment of equity method investment					26,613,000	2,500,000
Impairment of long-lived assets					0	0
Impairment of goodwill		0	$ 0	$ 37,800,000	0	37,812,000
Impairment of intangible assets, indefinite-lived					65,587,000	136,417,000
Advertising expenses					13,700,000	$ 25,700,000
Operating lease liabilities		8,833,000			8,833,000
Right-of-use-asset		6,254,000			$ 6,254,000
Earnings (loss) per share, Basic | $ / shares					$ (10.56)	$ (14.93)
Earnings (loss) per share, Diluted | $ / shares					$ (10.56)	(14.93)
Previously Reported
Significant Accounting Policies [Line Items]
Earnings (loss) per share, Basic | $ / shares						(15.73)
Earnings (loss) per share, Diluted | $ / shares						$ (15.73)
ASU 2016-02
Significant Accounting Policies [Line Items]
Operating lease liabilities							$ 10,400,000
Operating lease liabilities, current							1,700,000
Operating lease liabilities, noncurrent							8,700,000
Right-of-use-asset							$ 8,000,000
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
Convertible Notes
Significant Accounting Policies [Line Items]
Debt instrument, interest rate, stated percentage		1.50%			1.50%			1.50%
Sales Revenue, Services, Net | Customer One | Customer Concentration Risk
Significant Accounting Policies [Line Items]
Concentration risk, percentage					12.00%	16.00%
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					16.00%	12.00%
Subsidiaries | Non U.S
Significant Accounting Policies [Line Items]
Cash including restricted cash		$ 19,000,000			$ 19,000,000
Percentage of cash including restricted cash held in foreign subsidiaries		27.00%			27.00%
Earnings in foreign subsidiaries		$ 0			$ 0
Novel Corona Virus Adverse Impact
Significant Accounting Policies [Line Items]
Accumulated deficit		$ (429,100,000)			(429,100,000)
Net loss					$ (101,900,000)	$ (89,700,000)