Notes Payable (Details) $ / shares in Units, € in Thousands						1 Months Ended			11 Months Ended	12 Months Ended
	Dec. 06, 2023	Sep. 06, 2023	Aug. 23, 2023	May 04, 2023 shares	Dec. 08, 2022 USD ($) TradingDay $ / shares shares	Oct. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Apr. 30, 2018 USD ($)	Dec. 08, 2022 USD ($) $ / shares shares	Dec. 31, 2023 USD ($)	Dec. 31, 2023 EUR (€)	Dec. 31, 2022 USD ($) shares	Dec. 31, 2022 EUR (€) shares	Dec. 31, 2020 USD ($)	Dec. 31, 2023 EUR (€)	Dec. 31, 2021 USD ($)	Jul. 31, 2019 USD ($)	Jun. 01, 2019 USD ($)	Apr. 01, 2018 USD ($)
Debt Instrument [Line Items]
Prepaid Expense										$ 261,000		$ 116,000
Long-Term Debt										22,026,000
Cash and cash equivalents										15,624,000		64,294,000
Amortization of debt issuance costs												4,609,000
Company's equity interests										3,119,000		69,500,000
Gain on debt extinguishment										285,000
Number of private placement warrants agreed to purchase | shares				7,000,000
iHeart Media Note Payable [Member]
Debt Instrument [Line Items]
Interest rate per month																			1.50%
Maximum increase in interest rate of the event								8.00%
Debt Instrument, Term								5 years
Proceeds from Convertible Debt								$ 50,000,000
Interest expense										6,000		5,000
Debt instrument face value					$ 400,000				$ 400,000
Debt Instrument, Increase, Accrued Interest					$ 12,000
Exchanged shares of common stock | shares					32,329				32,329
iHeart Media Note Payable [Member] | Series D Preferred Stock [Member]
Debt Instrument [Line Items]
Debt instrument face value							$ 1,100,000
Debt Instrument, Increase, Accrued Interest							$ 16,000
Debt Conversion, Converted Instrument, Shares Issued | shares							36,098
iHeart Media Note Payable [Member] | Series E Preferred Stock [Member]
Debt Instrument [Line Items]
Debt instrument face value						$ 2,000,000
Debt Instrument, Increase, Accrued Interest						$ 54,000
Debt Conversion, Converted Instrument, Shares Issued | shares						169,156
iHeart Media Note Payable [Member] | Legacy Series E Preferred Stock [Member]
Debt Instrument [Line Items]
Debt Conversion, Converted Instrument, Shares Issued | shares					32,329
Prêt Garanti par l'État Loan [member]
Debt Instrument [Line Items]
Interest expense										55,000	€ 50	127,000	€ 120
Current portion of long term debt										1,300,000					€ 1,200
Non current portion of long term debt										3,500,000					€ 3,100
Mudrick Convertible Notes [Member]
Debt Instrument [Line Items]
Proceeds from Convertible Debt												$ 169,800,000
Debt instrument face value					$ 175,000,000				$ 175,000,000	$ 1,000
Debt Instrument, Maturity Date					Dec. 08, 2027
Debt instrument, Interest rate terms										(a) one quarter of one percent (0.25%) of the principal amount for the first ninety (90) days during which the event of default continues, and, thereafter, (b) one half of one percent (0.50%) of the principal amount for the ninety first (91st) through the one hundred and eightieth (180th) day during which the event of default continues, provided, however, that in no event will any such special interest accrue on any day at a combined rate per annum that exceeds one half of one percent (0.50%)	(a) one quarter of one percent (0.25%) of the principal amount for the first ninety (90) days during which the event of default continues, and, thereafter, (b) one half of one percent (0.50%) of the principal amount for the ninety first (91st) through the one hundred and eightieth (180th) day during which the event of default continues, provided, however, that in no event will any such special interest accrue on any day at a combined rate per annum that exceeds one half of one percent (0.50%)
Common stock trading days | TradingDay					90
Conversion price average daily volume-weighted average trading price					115.00%				115.00%
Issuance of common stock (in Shares) | shares												266,156	266,156
Interest percentage	0.50%	0.50%	0.50%
Class of warrants or rights warrants issued during the period units | shares				7,000,000
Interest percentage discription										one half of one percent (0.50%).	one half of one percent (0.50%).
Debt Conversion, Converted Instrument, Shares Issued | shares					86.96
Debt instrument additional effective rate of interest					2.00%				2.00%
Debt instrument conversion price | $ / shares					$ 11.5				$ 11.5
Debt instrument frequency of periodic payment												semi-annually	semi-annually
Debt Instrument, Date of First Required Payment									Jun. 15, 2023
Debt instrument payment terms												The Convertible Notes accrue interest payable semi-annually in arrears on December 15 and June 15 of each year, beginning on June 15, 2023, at a rate of 8.00% per annum (if paid in cash) or 9.50% per annum (if paid in-kind)	The Convertible Notes accrue interest payable semi-annually in arrears on December 15 and June 15 of each year, beginning on June 15, 2023, at a rate of 8.00% per annum (if paid in cash) or 9.50% per annum (if paid in-kind)
Maturity date												December 8, 2027, unless earlier converted, redeemed or repurchased.	December 8, 2027, unless earlier converted, redeemed or repurchased.
Number of trading days following the closing of the private placement warrants agreed to issue to the subscriber									100 days
Number of private placement warrants agreed to purchase | shares					2,800,000				2,800,000
Private placement warrant price (in Dollars per share) | $ / shares					$ 11.5				$ 11.5
Aggregate value of warrants will be exercisable for shares of common stock					$ 3,500,000				$ 3,500,000
Value Of Warrant Per Share | $ / shares					$ 1.25				$ 1.25
Number of trading days following the closing of private placement to reflect the adjusted upward or downward of weighted average price for value of warrants									90 days
Maximum upward or downward adjustment per warrant | $ / shares					$ 0.75				$ 0.75
Minimum number of warrants obligated to issue as a result of adjustment to warrants\ | shares					1,750,000				1,750,000
Maximum number of warrants obligated to issue as a result of adjustment to warrants | shares					7,000,000				7,000,000
Value of warrants for issuing has right to pay in cash					$ 3,500,000				$ 3,500,000
Backstop fee												$ 5,200,000
Mudrick Convertible Notes [Member] | First Ninety Days [Member]
Debt Instrument [Line Items]
Interest percentage	0.25%	0.25%	0.25%
Interest percentage discription										one quarter of one percent (0.25%)	one quarter of one percent (0.25%)
Mudrick Convertible Notes [Member] | First Ninty First Day Through One Hundred And Eightieth Day [Member]
Debt Instrument [Line Items]
Interest percentage	0.50%	0.50%	0.50%
Interest percentage discription										one half of one percent (0.50%)	one half of one percent (0.50%)
Mudrick Convertible Notes [Member] | Common Stock [Member]
Debt Instrument [Line Items]
Debt instrument face value					$ 1,000				$ 1,000
Mudrick Convertible Notes Paid in Cash [Member]
Debt Instrument [Line Items]
Interest rate per month					8.00%				8.00%
Mudrick Convertible Notes Paid in Kind [Member]
Debt Instrument [Line Items]
Interest rate per month					9.50%				9.50%
Maximum Additional Promotion Commitment [Member] | Within 18 Months From The Effective Date [Member] | iHeart Media Note Payable [Member]
Debt Instrument [Line Items]
Debt instrument face value																			$ 11,500,000
Percentage of commitment value in cash																			22.50%
Minimum Commitment Tranche [Member] | iHeart Media Note Payable [Member]
Debt Instrument [Line Items]
Debt instrument face value																	$ 400,000	$ 1,500,000
Prepaid Expense																		$ 500,000
Long-Term Debt												$ 100,000				$ 100,000
Minimum Commitment Tranche [Member] | Advertising [Member] | iHeart Media Note Payable [Member]
Debt Instrument [Line Items]
Debt instrument, amount utilized										$ 3,300,000
Initial Promotion Commitment Tranche [Member] | iHeart Media Note Payable [Member]
Debt Instrument [Line Items]
Proceeds from Convertible Debt								1,500,000
Minimum commitment tranche																			$ 3,500,000
Prepaid Expense																			600,000
Debt discount																			49,000
Amortization of Debt Discount (Premium)														$ 33,000
Additional Promotion Commitment Tranche [Member] | Within 18 Months From The Effective Date [Member] | iHeart Media Note Payable [Member]
Debt Instrument [Line Items]
Proceeds from Convertible Debt								$ 2,000,000
Minimum commitment tranche																			3,500,000
Prepaid Expense																			$ 500,000
Minimum [Member] | Mudrick Convertible Notes [Member]
Debt Instrument [Line Items]
Debt instrument conversion price | $ / shares					$ 9.21				$ 9.21
Maximum [Member]
Debt Instrument [Line Items]
Cash and cash equivalents										$ 10,000,000