Tax Equity Financings and Investment Tax Credit Sale (Details)										1 Months Ended		3 Months Ended		12 Months Ended
	Oct. 31, 2023 USD ($)	Dec. 16, 2022 USD ($) MW	Dec. 15, 2022 MW	Oct. 04, 2022 MW	Jul. 07, 2022 USD ($)	May 15, 2022 USD ($)	Dec. 13, 2021 USD ($)	Oct. 18, 2021	Aug. 04, 2021 USD ($)	Nov. 30, 2021 USD ($) MW	Aug. 31, 2021 USD ($) MW	Oct. 31, 2023 USD ($) Plant MW	Apr. 30, 2022 USD ($)	Oct. 31, 2023 USD ($) Plant MW	Oct. 31, 2022 USD ($)	Oct. 31, 2021 USD ($)	Jan. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Tax Equity Financing
Net (loss) income attributable to noncontrolling interest														$ (488,000)	$ (4,510,000)	$ 30,000
Accrued performance obligation	$ 3,958,000											$ 3,958,000		3,958,000
Groton Project [Member]
Tax Equity Financing
Capacity of plant | MW		6.0	7.4
Payment of amendment fee		$ 1,200,000
Net (loss) income attributable to noncontrolling interest														$ (2,500,000)	0
Percentage of cash and tax allocations to be received														95.00%
East West Bank Partnership Flip Transaction
Tax Equity Financing
Capacity of plant | MW											7.4
Tax equity financing commitment					$ 12,000,000.0						$ 15,000,000
Tax equity financing, Aggregate fee					500,000
Tax equity financing, Withdrawal right, Percent of return of investment								101.00%
Initial draw									$ 3,000,000.0
Closing costs									800,000
Remaining amount of draw									$ 12,000,000
Fee for extension of commercial operation deadline						$ 400,000
Net (loss) income attributable to noncontrolling interest																$ (30,000)
Percentage reflecting conditional withdrawal for loss attributable to non controlling interest																1.00%
East West Bank Partnership Flip Transaction | Groton Project [Member]
Tax Equity Financing
Tax equity financing, Aggregate fee		$ 500,000
REI Partnership Flip Transaction
Tax Equity Financing
Capacity of plant | MW										7.4
Tax equity financing commitment										$ 12,400,000			$ 11,900,000
Amount of Refund													$ 500,000
Amount of distribution															$ 300,000
Percentage of annual interest rate															2.73%
Initial draw							$ 3,200,000
Closing costs							$ 400,000
Remaining amount of draw																	$ 9,200,000	$ 9,200,000
Legal and advisory fees															$ 400,000
Net (loss) income attributable to noncontrolling interest														$ 2,000,000.0	$ (4,500,000)
Percentage of cash and tax allocations to be received										95.00%
Percentage of amount payable										10.30%
Tax equity financing transactions with Franklin Park
Tax Equity Financing
Number of Fuel Cell Power Plants, Tax Equity Financing Transaction | Plant												2		2
Tax equity financing commitment	30,200,000											$ 30,200,000		$ 30,200,000
Tax equity financing transaction, commitment amount received	9,100,000													9,100,000
Closing costs												1,800,000		1,800,000
Tax equity financing transactions with Franklin Park | Derby Project
Tax Equity Financing
Estimated additional fees														500,000
Additional funding														20,600,000
Remaining amount of draw	20,600,000											$ 20,600,000		$ 20,600,000
Percentage of cash and tax allocations to be received														95.00%
Tax equity financing transactions with Franklin Park | Derby Project 14.0 Mega Watt
Tax Equity Financing
Capacity of plant | MW												14.0		14.0
Tax equity financing transactions with Franklin Park | Derby Project 2.8 Mega Watt
Tax Equity Financing
Capacity of plant | MW												2.8		2.8
Toyota Investment Tax Credit Sale | REI
Tax Equity Financing
Project's qualified ITCs	8,400,000
Purchase amount of ITCs	7,100,000
Eligible capital expenditure ITC rate per $1 purchased ITCs	0.85
Transaction costs	400,000
Accrued performance obligation	$ 6,300,000											$ 6,300,000		$ 6,300,000
First Anniversary of Project Achieving Commercial Operations [Member] | East West Bank Partnership Flip Transaction
Tax Equity Financing
Tax equity financing commitment, Contributions					4,000,000
Second Anniversary of Project Achieving Commercial Operations [Member] | East West Bank Partnership Flip Transaction
Tax Equity Financing
Tax equity financing commitment, Contributions					4,000,000
Third Anniversary of Project Achieving Commercial Operations [Member] | East West Bank Partnership Flip Transaction
Tax Equity Financing
Tax equity financing commitment, Contributions					$ 4,000,000
Maximum | East West Bank Partnership Flip Transaction | Groton Project [Member]
Tax Equity Financing
Capacity of plant | MW				7.4