Subsequent Events - Additional Information (Details) $ / shares in Units, $ in Thousands						3 Months Ended					6 Months Ended		12 Months Ended
	Aug. 08, 2025 USD ($) $ / shares shares	Aug. 05, 2025 USD ($) $ / shares shares	Jul. 15, 2025 USD ($) Digital Assets	Jul. 07, 2025 USD ($) $ / shares shares	Jul. 01, 2025 EUR (€) $ / shares shares	Jun. 30, 2025 USD ($) $ / shares shares	Mar. 31, 2025 USD ($) $ / shares shares	Nov. 30, 2024 shares	Jun. 30, 2024 shares	Mar. 31, 2024 shares	Jun. 30, 2025 USD ($) $ / shares shares	Jun. 30, 2024 USD ($) shares	Sep. 30, 2027 EUR (€)	Sep. 30, 2026 EUR (€)	Jul. 25, 2025 USD ($) shares	Jun. 26, 2025 $ / shares	Jun. 13, 2025 USD ($) $ / shares	Jun. 10, 2025 USD ($)	Jun. 02, 2025 shares	Apr. 17, 2025 shares	Jan. 28, 2025 $ / shares	Jan. 23, 2025 USD ($) $ / shares shares	Dec. 31, 2024 $ / shares shares	Sep. 30, 2024 USD ($) shares
Subsequent Event [Line Items]
Preferred stock, par value | $ / shares																							$ 0.0001
Common stock, par value | $ / shares						$ 0.0001					$ 0.0001												0.0001
Description of subject to satisfaction of applicable milestones					If the revenues of Wattbike for the period from October 1, 2025 to September 30, 2026 (“FY26”) (“FY26 Revenues”) exceed £17,500,000, the additional consideration for FY26 shall be an amount equal to 50% of the amount by which FY26 revenues exceeded £17,500,000, subject to a cap of £1,500,000. If FY26 Revenues did not exceed £17,500,000, there shall be no additional consideration paid for FY26. (ii) If the revenues of Wattbike for the period from October 1, 2026 to September 30, 2027 (“FY27”) (“FY27 Revenues”) exceed £20,000,000, the additional consideration for FY27 shall be an amount equal to 50% of the amount by which FY26 revenues exceeded £20,000,000, subject to a cap of £1,500,000. If FY27 Revenues did not exceed £20,000,000, there shall be no additional consideration paid for FY27.
Related acquisition costs						$ 100					$ 100
Proceeds from Warrant Exercises											0	$ 92
Proceeds from the June 2025 Convertible Exchangeable Notes											52,636	$ 4,756
Net Trade Value						$ 1,000					$ 1,000
June Two Thousand Twenty Five Convertible Exchangeable Notes [Member]
Subsequent Event [Line Items]
Common stock, par value | $ / shares																	$ 0.0001
Aggregate principal amount																	$ 55,600	$ 55,600
Exchange Agreement [Member]
Subsequent Event [Line Items]
Aggregate principal amount																								$ 2,000
Subsequent Event [Member] | FET Tokens [Member]
Subsequent Event [Line Items]
Number of FET purchased | Digital Assets			37,809,264
Subsequent Event [Member] | June Two Thousand Twenty Five Convertible Exchangeable Notes [Member]
Subsequent Event [Line Items]
Proceeds from the June 2025 Convertible Exchangeable Notes			$ 27,250
Subsequent Event [Member] | Exchange Agreement [Member] | Term Loan [Member]
Subsequent Event [Line Items]
Aggregate principal amount	$ 300
Series C Preferred Stock [Member]
Subsequent Event [Line Items]
Preferred stock, par value | $ / shares						$ 0.0001					$ 0.0001												$ 0.0001
Preferred stock shares issued | shares						1,210,155					1,210,155								21,584	46,727		126,515	2,861,128	2,861,128
Series C Preferred Stock [Member] | Lender Settlement Agreement [Member]
Subsequent Event [Line Items]
Preferred stock, par value | $ / shares							$ 0.0001															$ 0.0001
Preferred stock shares issued | shares							1,188,571															496,246
Net Trade Value							$ 2,400															$ 1,000
Series C Preferred Stock [Member] | Subsequent Event [Member] | Lender Settlement Agreement [Member]
Subsequent Event [Line Items]
Preferred stock, par value | $ / shares		$ 0.0001
Settlement made in cash		$ 600
Issuance of shares upon conversion | shares		195,732
Net Trade Value		$ 1,000
Series A Preferred Stock [Member]
Subsequent Event [Line Items]
Preferred stock shares issued | shares																			47,332	81,464		112,334
Series E Preferred Stock [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Preferred stock shares issued | shares					1,300,000
Common Stock [Member]
Subsequent Event [Line Items]
Common stock, par value | $ / shares						$ 0.0001					$ 0.0001					$ 0.0001					$ 0.0001		$ 0.0001
Issuance of shares upon conversion | shares						568,874	394,158		251	37		288
Issuance of Common stock upon extinguishment of debt, shares | shares								23,516
Common Stock [Member] | Subsequent Event [Member] | Exchange Agreement [Member]
Subsequent Event [Line Items]
Issuance of Common stock upon extinguishment of debt, shares | shares	60,000
Share issue price | $ / shares	$ 5.5
January 2025 Warrants [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Warrant to exercise | shares				18,450
Warrants exercise price | $ / shares				$ 5.42
Proceeds from Warrant Exercises				$ 100
Class A Incremental Warrant Exercise [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Aggregate principal amount															$ 3,000,000
Class A Incremental Warrant Exercise [Member] | Common Stock [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Aggregate shares of common stock | shares															304,428
Wattbike [Member] | Series E Preferred Stock [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Preferred stock shares issued | shares					1,300,000
Purchase Agreement [Member] | Forecast [Member]
Subsequent Event [Line Items]
Revenue earnout threshold | €													€ 20,000,000	€ 17,500,000
Percentage of revenue earnout threshold													50.00%	50.00%
Earnout cap | €													€ 1,500,000	€ 1,500,000
Purchase Agreement [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Purchase price payable closing of transaction | €					1
Preferred stock convertible conversion date					Jun. 15, 2026
Purchase Agreement [Member] | Series E Preferred Stock [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Preferred stock, par value | $ / shares					$ 0.0001
Purchase Agreement [Member] | Common Stock [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Common stock, par value | $ / shares					$ 0.0001
Purchase Agreement [Member] | Wattbike [Member] | Forecast [Member]
Subsequent Event [Line Items]
Revenue earnout threshold | €													€ 20,000,000