Related Party Transactions - Additional Information (Details)									9 Months Ended	12 Months Ended
	Dec. 13, 2021 USD ($) shares	Nov. 25, 2021 USD ($)	Dec. 13, 2020 USD ($) shares	Nov. 25, 2020 USD ($)	Aug. 11, 2020 USD ($)	Apr. 22, 2020 USD ($)	Nov. 25, 2019 USD ($)	Jun. 28, 2019 USD ($) vote	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($)	Jun. 01, 2021 USD ($)	May 19, 2021 USD ($)	Sep. 30, 2020 USD ($)	Aug. 28, 2020 USD ($)	Mar. 27, 2020 USD ($)	Feb. 28, 2020 USD ($)	Jan. 31, 2020 USD ($)	Dec. 13, 2019 shares
Related Party Transaction [Line Items]
Transaction agreement date								Jun. 28, 2019
Principal amount outstanding										$ 102,071,000
Senior credit facility amount										0
Interest expense recognized										11,100,000	$ 9,493,000
Dividends paid in kind	$ 2,700,000		$ 2,100,000
Additional shares issued due to increase in accrued value of preferred stock | shares	0		0
Preferred Stock
Related Party Transaction [Line Items]
Unpaid cumulative dividends										200,000	100,000
Employee Leasing Agreement
Related Party Transaction [Line Items]
Unpaid expense										0
Employee Leasing Agreement | Operating Expenses Excluding Depreciation And Amortization
Related Party Transaction [Line Items]
Operating expenses											9,600,000
Second Amended Promissory Note
Related Party Transaction [Line Items]
Additional interest payments									$ 25,000
Emmis
Related Party Transaction [Line Items]
Principal amount outstanding										6,154,000
Emmis | Convertible Promissory Notes
Related Party Transaction [Line Items]
Face amount of debt							$ 5,000,000.0
SG Broadcasting | Series A Convertible Preferred Stock
Related Party Transaction [Line Items]
Preferred stock issued | shares																			220,000
Preferred stock issued										2,800,000	2,100,000
SG Broadcasting | Convertible Promissory Notes
Related Party Transaction [Line Items]
Face amount of debt							$ 6,300,000
Emmis Operating Company | Management Agreement
Related Party Transaction [Line Items]
Initial term							2 years
Initial term cancellable period							18 months
Annual fee							$ 1,300,000
Emmis Operating Company | Management Agreement | Corporate Expenses
Related Party Transaction [Line Items]
Recorded fee expense										$ 1,100,000	1,300,000
Emmis Operating Company | Employee Leasing Agreement
Related Party Transaction [Line Items]
Employee lease agreement, terms										The initial term of the Employee Leasing Agreement lasted through December 31, 2020. Effective January 1, 2021, the Employee Leasing Agreement was terminated, and the Company hired all of the leased employees and assumed the employment and collective bargaining agreements related to leased employees.
SG Broadcasting
Related Party Transaction [Line Items]
Principal amount outstanding										$ 27,574,000
SG Broadcasting | Series A Convertible Preferred Stock
Related Party Transaction [Line Items]
Preferred stock issued | shares										220,000
Preferred stock issued										$ 22,000,000.0
SG Broadcasting | Emmis
Related Party Transaction [Line Items]
Business acquisition, date of acquisition							Nov. 25, 2019
Business acquisition, retained net working capital							$ 5,000,000.0
Business acquisition net working capital																		$ 5,000,000.0
SG Broadcasting | Promissory Note
Related Party Transaction [Line Items]
Additional loan for working capital														$ 300,000	$ 8,700,000	$ 3,000,000.0	$ 2,000,000.0
Principal amount outstanding										27,600,000					$ 20,000,000.0
SG Broadcasting | Promissory Note | Maximum
Related Party Transaction [Line Items]
Face amount of debt																$ 20,000,000.0	$ 10,300,000
SG Broadcasting | May 2021 SG Broadcasting Promissory Note
Related Party Transaction [Line Items]
Face amount of debt												$ 1,000,000.0	$ 3,000,000.0
Senior credit facility amount													$ 7,000,000.0
SG Broadcasting | Emmis | Convertible Promissory Note
Related Party Transaction [Line Items]
Principal amount outstanding										6,200,000
Senior credit facility amount										0
Emmis | Convertible Promissory Notes
Related Party Transaction [Line Items]
Principal amount outstanding										6,200,000	5,500,000
Additional interest payments		$ 600,000		$ 500,000
Interest expense recognized										600,000
SG Broadcasting | Convertible Promissory Notes
Related Party Transaction [Line Items]
Principal amount outstanding										27,600,000	$ 21,200,000
Additional interest payments		$ 2,200,000		$ 1,100,000
Interest expense recognized										$ 2,500,000
Transaction Agreement
Related Party Transaction [Line Items]
Agreement termination date										Nov. 30, 2021
Transaction Agreement | Emmis
Related Party Transaction [Line Items]
Purchase price for the assets of radio stations								$ 91,500,000
Number of vote per share | vote								1
Transaction Agreement | Emmis | Convertible Promissory Note
Related Party Transaction [Line Items]
Notes payable								$ 5,000,000.0
Transaction Agreement | SG Broadcasting
Related Party Transaction [Line Items]
Number of vote per share | vote								10
Employee Leasing Agreement
Related Party Transaction [Line Items]
Agreed percentage to promptly pay amount equal to PPP loan						31.56%
Employee Leasing Agreement | Maximum
Related Party Transaction [Line Items]
Agreed amount to waive reimburse obligations						$ 1,500,000
Billboard Agreement | Fairway
Related Party Transaction [Line Items]
Payments to acquire businesses					$ 25,000
Provisions on limitation of liability and indemnification outstanding										$ 100,000
Fairway incurred of out-of-pocket expenses										200,000
Reimbursement for out-of-pocket expenses										$ 100,000
MediaCo | Transaction Agreement | Emmis
Related Party Transaction [Line Items]
Equity ownership interest								23.72%
MediaCo | Transaction Agreement | SG Broadcasting
Related Party Transaction [Line Items]
Equity ownership interest								76.28%