Notes Payable - Additional Information (Details)									1 Months Ended							3 Months Ended				9 Months Ended				11 Months Ended	12 Months Ended
	Sep. 08, 2023 USD ($)	Sep. 06, 2023	Aug. 23, 2023	Aug. 07, 2023 USD ($)	May 04, 2023 shares	Dec. 08, 2022 USD ($) TradingDay $ / shares shares	Aug. 03, 2021 EUR (€)	Jul. 13, 2021 EUR (€)	Dec. 31, 2022 EUR (€)	Oct. 31, 2021 EUR (€)	Jan. 31, 2021 EUR (€)	Nov. 30, 2020 EUR (€)	Oct. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Apr. 30, 2018 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 EUR (€)	Sep. 30, 2022 USD ($)	Sep. 30, 2022 EUR (€)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 EUR (€)	Sep. 30, 2022 USD ($)	Sep. 30, 2022 EUR (€)	Dec. 08, 2022 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2020 USD ($)	Sep. 30, 2023 EUR (€)	Dec. 31, 2022 EUR (€)	Oct. 01, 2021 EUR (€)	Jul. 31, 2019 USD ($)	Jun. 01, 2019 USD ($)	Apr. 01, 2018 USD ($)
Debt Instrument [Line Items]
Prepaid Expense																$ 383,000				$ 383,000					$ 116,000
Long-Term Debt																		$ 18,174,000				$ 18,174,000
Cash and cash equivalents																22,164,000		27,216,000		22,164,000		27,216,000			64,294,000
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																1,000		1,000		4,000		4,000
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													$ 2,000,000	$ 1,100,000
Debt Instrument, Increase, Accrued Interest													$ 54,000	$ 16,000
Debt Conversion, Converted Instrument, Shares Issued | shares													528,195	112,718
iHeart Media Note Payable [Member] | Legacy Series E Preferred Stock [Member]
Debt Instrument [Line Items]
Debt Conversion, Converted Instrument, Shares Issued | shares						100,951
Prêt Garanti par l'État Loan [member]
Debt Instrument [Line Items]
Interest expense																11,000	€ 10,400	$ 14,000	€ 13,400	42,200	€ 39,900	$ 28,500	€ 27,300
Current portion of long term debt																1,200,000				1,200,000							€ 1,100,000
Non current portion of long term debt																3,500,000				3,500,000							€ 3,300,000
Prêt Garanti par l'État Loan [member] | Covid Nineteen [Member]
Debt Instrument [Line Items]
Debt instrument face value | €												€ 4,500,000
Prêt Garanti par l'État Loan [member] | Covid Nineteen [Member] | Tranche One [Member]
Debt Instrument [Line Items]
Debt instrument face value | €												3,000,000
Prêt Garanti par l'État Loan [member] | Covid Nineteen [Member] | Tranche Two [Member]
Debt Instrument [Line Items]
Debt instrument face value | €												1,500,000
Debt Instrument, Annual Principal Payment | €												€ 300,000
Long term debt month of maturity commencement												2021-09
Long term debt month of maturity end												2025-09
Long term debt bearing fixed interest rate												2.25%
Prêt Garanti par l'État Loan [member] | Covid Nineteen [Member] | Amendement One To The Loan Agreement [Member]
Debt Instrument [Line Items]
Additional guarantee commission loan expense to french government | €									€ 51,000
Prêt Garanti par l'État Loan [member] | Covid Nineteen [Member] | Amendement One To The Loan Agreement [Member] | Tranche One [Member]
Debt Instrument [Line Items]
Debt instrument face value | €								€ 3,000,000				€ 3,000,000																€ 3,000,000
Long term debt month of maturity commencement								2021-11
Long term debt month of maturity end								2022-11
Prêt Garanti par l'État Loan [member] | Covid Nineteen [Member] | Amendement One To The Loan Agreement [Member] | Tranche One [Member] | SubTranche One [Member]
Debt Instrument [Line Items]
Debt instrument face value | €							€ 600,000
Long term debt month of maturity commencement							2022-12
Long term debt month of maturity end							2026-11
Long Term Debt Additional Fixed Interest Rate							0.70%
Debt instrument monthly payment of principal | €							€ 12,000
Prêt Garanti par l'État Loan [member] | Covid Nineteen [Member] | Amendement One To The Loan Agreement [Member] | Tranche One [Member] | Sub Tranche Two [Member]
Debt Instrument [Line Items]
Debt instrument face value | €																													€ 2,400,000
Long term debt month of maturity commencement										2022-11
Long term debt month of maturity end										2026-11
Debt instrument additional effective rate of interest										1.44%
Debt instrument monthly payment of principal | €										€ 49,000
Prêt Garanti par l'État Loan [member] | Covid Nineteen [Member] | Amendement One To The Loan Agreement [Member] | Tranche Two [Member]
Debt Instrument [Line Items]
Debt instrument face value | €											€ 1,500,000																	€ 75,000
Long term debt month of maturity commencement											2021-09
Long term debt month of maturity end											2026-06
Mudrick Convertible Notes [Member]
Debt Instrument [Line Items]
Proceeds from Convertible Debt																									$ 169,800,000
Debt instrument face value						$ 175,000,000										1,000				$ 1,000				$ 175,000,000
Debt Instrument, Maturity Date						Dec. 08, 2027
Class of warrants or rights warrants issued during the period units | shares					7,000,000
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
Conversion price average daily volume-weighted average trading price						115.00%																		115.00%
Common stock trading days | TradingDay						90
Debt instrument frequency of periodic payment																									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).
Maturity date																									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
Backstop fee																									$ 5,200,000
Issuance of common stock (in Shares) | shares																									266,156
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%).
Interest percentage discription																				one half of one percent (0.50%)	one half of one percent (0.50%)
Interest percentage		0.50%	0.50%
Mudrick Convertible Notes [Member] | First Ninety (90) Days [Member]
Debt Instrument [Line Items]
Interest percentage discription																				one quarter of one percent (0.25%)	one quarter of one percent (0.25%)
Interest percentage		0.25%	0.25%
Mudrick Convertible Notes [Member] | First (91st) Through One Hundred and Eightieth (180th) Day [Member]
Debt Instrument [Line Items]
Interest percentage discription																				one half of one percent (0.50%)	one half of one percent (0.50%)
Interest percentage		0.50%	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%
Mudrick Bridge Note [Member]
Debt Instrument [Line Items]
Interest rate per month				15.00%
Debt instrument face value	$ 15,040,685			$ 3,000,000
Principal repayment premium percentage				100.00%
Debt Instrument, Maturity Date				Sep. 07, 2023
Mudrick Super Priority Note [Member]
Debt Instrument [Line Items]
Interest rate per month	15.00%
Debt instrument additional interest rate to be paid in case of default	2.00%
Debt instrument face value	$ 15,040,685
Debt Instrument, Maturity Date	Aug. 07, 2024
Percentage of net proceeds to be used to repay notes before January 31,2024	50.00%
Percentage of net proceeds to be used to repay notes after January 31,2024	100.00%
Percentage of net proceeds from sales or disposition to be used to repay notes	100.00%
Mandatory prepayment exempted first net proceeds of company	$ 10,000,000
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																99,000				$ 99,000					$ 99,000
Minimum Commitment Tranche [Member] | Advertising [Member] | iHeart Media Note Payable [Member]
Debt Instrument [Line Items]
Debt instrument, amount utilized																3,300,000				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				$ 10,000,000
Maximum [Member] | Prêt Garanti par l'État Loan [member] | Covid Nineteen [Member]
Debt Instrument [Line Items]
Long term debt period of maturity																									6 years			6 years