Commitments and Contingencies - Commitments (Details)										1 Months Ended						3 Months Ended		9 Months Ended
	Jan. 01, 2025 $ / shares	Oct. 25, 2023 ft²	Jan. 25, 2022 USD ($)	Jan. 25, 2022 EUR (€)	Dec. 22, 2021 USD ($) Item	Dec. 22, 2021 EUR (€) Item	Oct. 07, 2021 USD ($)	Oct. 07, 2021 EUR (€)	Apr. 06, 2021 USD ($) ft²	Nov. 30, 2022 USD ($) Item	Nov. 30, 2022 EUR (€) Item	Oct. 31, 2022 USD ($) Item	Oct. 31, 2022 EUR (€) Item	May 31, 2022 USD ($) Item	May 31, 2022 EUR (€) Item	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Dec. 08, 2023	Oct. 24, 2023	Jan. 26, 2022
Commitments and Contingencies
Lease term																				2 years
Base rent			$ 4,200	€ 4,000
Total deposit paid			9,500	9,000
Cash paid for operating lease liabilities recognized under operating cash flows																		$ 210,000	$ 337,000
Addition to right-of-use assets obtained from new and modified operating liabilities																		341,000	219,000
General and administrative expense
Commitments and Contingencies
Lease costs																$ 170,000	$ 296,000	$ 433,000	$ 648,000
If contracts are terminated within 12 months
Commitments and Contingencies
Base rent			$ 4,000	€ 3,817
Office space sub lease
Commitments and Contingencies
Area (in square feet) | ft²									10,526
Extension period									3 years
Lease term									3 years
Monthly base rent for first twelve months									$ 42,000
Monthly base rent for subsequent twelve months									43,000
Monthly base rent for final 12 months									$ 45,000
Leased vehicle
Commitments and Contingencies
Lease term										48 months	48 months	48 months	48 months
Number of vehicles on lease | Item										2	2	3	3
Total monthly lease payment, payable in advance										$ 1,500	€ 1,459	$ 2,200	€ 2,094
Suite 600
Commitments and Contingencies
Revised rental rate per rentable square foot | $ / shares	$ 24
Percentage of rental rate subject to annual escalations thereafter	3.00%
Office lease agreement | Leased office premises
Commitments and Contingencies
Extension period																						20 months
Base rent							$ 10,500	€ 10,000
Total deposit paid							$ 21,000	€ 20,000
Office lease agreement | Suite 400
Commitments and Contingencies
Area (in square feet) | ft²		5,735
Office lease agreement | Suite 400 | Minimum
Commitments and Contingencies
Area (in square feet) | ft²		10,526
Extension period		1 year																			1 year
Office lease agreement | Suite 400 | Maximum
Commitments and Contingencies
Area (in square feet) | ft²		10,998
Extension period		5 years																			3 years
Office lease agreement | Suite 600
Commitments and Contingencies
Area (in square feet) | ft²		5,263
Option to extend the lease		true
Arval Service Lease Italia Spa agreement | Leased vehicle
Commitments and Contingencies
Lease term					48 months	48 months
Total deposit paid					$ 20,000	€ 19,000
Number of vehicles on lease | Item					2	2
Total monthly lease payment, payable in advance					$ 2,100	€ 2,000
Vehicle lease agreement | Leased vehicle
Commitments and Contingencies
Lease term														48 months	48 months
Total deposit paid														$ 22,000	€ 21,000
Number of vehicles on lease | Item														1	1
Total monthly lease payment, payable in advance														$ 880	€ 833