Notes Payable - Secured SPA Notes Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Aug. 02, 2024	Mar. 31, 2025	Mar. 31, 2024	Jun. 30, 2024	Jan. 28, 2025	Dec. 31, 2024	Dec. 21, 2024	Sep. 05, 2024
Debt Instrument [Line Items]
Payments of notes payable issuance costs		$ 99	$ 25
Notes Payable
Debt Instrument [Line Items]
Gain (loss) on fair value adjustment of debts		$ 21,780	27,721
Secured SPA Notes | Notes Payable
Debt Instrument [Line Items]
Debt instrument, fixed conversion price percentage		90.00%
Conversion price (in dollars per share)		$ 1.16		$ 29.33
Debt instrument, term (in years)		6 years
Notes payable		$ 2,400				$ 5,500
Proceeds from debt, net of issuance costs			$ 1,500
Aggregate principal amount		$ 600
Shares issued from conversion (in shares)		602,902	2,937,946
Gain (loss) on fair value adjustment of debts		$ 2,479	$ 25,118
Payments of notes payable issuance costs			0
Debt conversion, converted amount			18,300
Secured SPA Notes | Notes Payable | Class A Common Stock
Debt Instrument [Line Items]
Redemption price, percentage				105.00%
Gain (loss) extinguishments of debt		$ (300)	(11,400)
Secured SPA Notes | Notes Payable | Metaverse Horizon Limited and V W Investment Holding Limited
Debt Instrument [Line Items]
Percent of purchaser's conversion shares		33.00%
SPA Notes | Notes Payable
Debt Instrument [Line Items]
Conversion price (in dollars per share)	$ 29.33
SPA Notes | Notes Payable | Class A Common Stock
Debt Instrument [Line Items]
Redemption price, percentage	90.00%
Junior Secured SPA Notes | Notes Payable
Debt Instrument [Line Items]
Notes payable bearing interest rate								10.00%
Conversion price (in dollars per share)					$ 5.24		$ 1.16	$ 5.24
Debt instrument, term (in years)		1 year
Proceeds from debt, net of issuance costs		$ 7,600
Gain (loss) on fair value adjustment of debts		10,435
Payments of notes payable issuance costs		$ 0
Junior Secured SPA Notes | Notes Payable | Class A Common Stock
Debt Instrument [Line Items]
Shares issued from conversion (in shares)		113,958,070
Gain (loss) extinguishments of debt		$ (12,800)
Debt conversion, converted amount		$ 15,400
2024 Unsecured SPA Notes | Notes Payable
Debt Instrument [Line Items]
Notes payable bearing interest rate		10.00%				10.00%
Conversion price (in dollars per share)		$ 1.16			$ 1.16		$ 1.16
Debt instrument, term (in years)		1 year
Notes payable		$ 11,300				$ 7,000
Proceeds from debt, net of issuance costs		20,000
Gain (loss) on fair value adjustment of debts		6,798
Payments of notes payable issuance costs		$ 0
Unsecured Convertible Note | Notes Payable
Debt Instrument [Line Items]
Conversion price (in dollars per share)		$ 1.16
Debt instrument, term (in years)		6 years
Notes payable						$ 6,700
Proceeds from debt, net of issuance costs		$ 0
Shares issued from conversion (in shares)		4,167,764
Gain (loss) on fair value adjustment of debts		$ 2,024	$ 2,888
Debt conversion, converted amount		$ 4,400
Unsecured Convertible Note | Notes Payable | Class A Common Stock
Debt Instrument [Line Items]
Debt instrument, fixed conversion price percentage		90.00%
Gain (loss) extinguishments of debt		$ (2,800)
Minimum | Secured SPA Notes | Notes Payable
Debt Instrument [Line Items]
Notes payable bearing interest rate		10.00%				10.00%
Minimum | Unsecured Convertible Note | Notes Payable
Debt Instrument [Line Items]
Notes payable bearing interest rate		10.00%				10.00%
Maximum | Secured SPA Notes | Notes Payable
Debt Instrument [Line Items]
Notes payable bearing interest rate		15.00%				15.00%
Maximum | Unsecured Convertible Note | Notes Payable
Debt Instrument [Line Items]
Notes payable bearing interest rate		15.00%				15.00%