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Debt and Financing Obligation - Additional Information (Details) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
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Sep. 30, 2019 USD ($) | Jul. 25, 2019 USD ($) | Jul. 19, 2019 MW | Jun. 26, 2019 USD ($) | Jun. 11, 2019 USD ($) | Jun. 03, 2019 | May 09, 2019 USD ($) | Apr. 01, 2019 USD ($) | Mar. 29, 2019 USD ($) | Feb. 28, 2019 USD ($) MW | Jan. 09, 2019 USD ($) | Dec. 21, 2018 USD ($) MW | Dec. 13, 2018 USD ($) MW | Jun. 13, 2018 | Apr. 30, 2019 USD ($) | Jan. 31, 2019 USD ($) Employee Position | Nov. 30, 2015 USD ($) Position | Jul. 31, 2019 USD ($) | Jul. 31, 2019 USD ($) | Apr. 01, 2020 USD ($) | Oct. 31, 2018 USD ($) | Oct. 01, 2018 USD ($) | Apr. 30, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,800,000 | $ 1,800,000 |  |  |  |
Interest rate, basis points |  |  |  |  |  |  | 275.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amendment period description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | “Amendment Period” is defined as the period from and after July 24, 2019 through the earlier of (i) September 30, 2019 and (ii) the occurrence of any event of default under the Tenth Hercules Amendment; provided, however, that in the event that the outstanding balance of the secured obligations (including accrued interest, fees, costs, and charges) has been paid down to an amount that is less than or equal to $5.0 million on or before September 30, 2019, the Amendment Period shall be extended automatically through the earlier of (i) October 22, 2019 and (ii) the occurrence of any event of default under the Tenth Hercules Amendment. |  |  |  |
EMRE [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
License agreement payment |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
B. Riley FBR, Inc and Oppenheimer & Co. Inc. [Member] | At Market Issuance Sales Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage on net proceeds after deducting commission and offering related expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of secured obligations for automatic extension of amendment period | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Connecticut Green Bank Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,900,000 | $ 5,900,000 |  |  |  |
Subordinated Credit Agreement [Member] | Bridgeport Fuel Cell, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,900,000 | $ 5,900,000 |  |  |  |
Proceeds from long-term lines of credit |  |  |  |  |  |  | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, Interest rate |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, covenant terms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | On May 9, 2019, in connection with the closing of the purchase of BFC, BFC entered into a subordinated credit agreement with the Connecticut Green Bank whereby Connecticut Green Bank provided financing in the amount of $6.0 million (the “Subordinated Credit Agreement”). As security for the Subordinated Credit Agreement, Connecticut Green Bank received a perfected lien, subordinated and second in priority to the liens securing the $25.0 million loaned under the BFC Credit Agreement (as defined below), in all of the same collateral securing the BFC Credit Agreement. The interest rate under the Subordinated Credit Agreement is 8% per annum. Principal and interest are due monthly in amounts sufficient to fully amortize the loan over an 84 month period ending in May 2026. The Subordinated Credit Agreement contains customary representations, warranties and covenants. The balance under the Subordinated Credit Agreement as of July 31, 2019 was $5.9 million. |  |  |  |
Subordinated Credit Agreement [Member] | Bridgeport Fuel Cell, LLC [Member] | Senior Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liens securing senior term loan amount |  |  |  |  |  |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  | May 09, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | The interest rate under the BFC Credit Agreement fluctuates monthly at the 30-day LIBOR rate plus 275 basis points |  |  |  |  |
Debt instrument, interest rate basis term |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net interest rate |  |  |  |  |  |  | 5.09% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement [Member] | Interest Rate Swap [Member] | Level Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mark-to-market adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000 | $ 400,000 |  |  |  |
Credit Agreement [Member] | Bridgeport Fuel Cell, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, covenant terms |  |  |  |  |  |  | The BFC Credit Agreement also requires BFC to maintain a debt service reserve at each of Liberty Bank and Fifth Third of $1.25 million, which debt service reserves were funded on May 10, 2019, to be held in deposit accounts at each respective bank, with funds to be disbursed with the consent of or at the request of the required lenders in their sole discretion. Each of Liberty Bank and Fifth Third also has an operation and module replacement reserve (“O&M Reserve”) of $250.0 thousand, both of which were funded at closing, to be held in deposit accounts at each respective bank, and thereafter BFC is required to deposit $100.0 thousand per month into each O&M Reserve for the first five years of the BFC Credit Agreement, with such funds to be released at the sole discretion of Liberty Bank and Fifth Third, as applicable. BFC is also required to maintain excess cash flow reserve accounts at each of Liberty Bank and Fifth Third and to deposit 50% of the excess cash flows from the Bridgeport Fuel Cell Project into these accounts. Excess cash flow consists of cash generated by BFC from the Bridgeport Fuel Cell Project after payment of all expenses (including after payment of service fees to the Company), debt service to Liberty Bank and Fifth Third, the funding of all required reserves, and payments to Connecticut Green Bank for the subordinated facility. BFC is also required to maintain a debt service coverage ratio of not less than 1.20, measured annually based on fiscal quarters beginning with the quarter ended July 31, 2020. The BFC Credit Agreement contains other representations, warranties and covenants and includes a material adverse effect clause related to the operations, business, properties, liabilities or prospects of Bridgeport Fuel Cell, LLC. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal and interest frequency of periodic payment |  |  |  |  |  |  | monthly |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans amortization period |  |  |  |  |  |  | 84 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement [Member] | Bridgeport Fuel Cell, LLC [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt service coverage ratio |  |  |  |  |  |  | 120.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement [Member] | Bridgeport Fuel Cell, LLC [Member] | Fifth Third Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from long-term lines of credit |  |  |  |  |  |  | $ 12,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt service reserves required to be maintained and held in deposit accounts |  |  |  |  |  |  | 1,250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operation and module replacement reserves required to be maintained and held in deposit accounts |  |  |  |  |  |  | 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operation and module replacement reserve to be deposited per month |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of excess cash flows to be maintained in accounts |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement [Member] | Bridgeport Fuel Cell, LLC [Member] | Liberty Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from long-term lines of credit |  |  |  |  |  |  | $ 12,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt service reserves required to be maintained and held in deposit accounts |  |  |  |  |  |  | 1,250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operation and module replacement reserves required to be maintained and held in deposit accounts |  |  |  |  |  |  | 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operation and module replacement reserve to be deposited per month |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of excess cash flows to be maintained in accounts |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PNC Energy Capital, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,200,000 | $ 45,200,000 |  | $ 46,100,000 |  |
Term of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |
State of Connecticut [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 | 10,000,000 | $ 10,000,000 |  | 10,000,000 |  |
Debt Instrument term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |
Debt instrument, payment terms, period principal payments are deferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |
Debt instrument, date of first required payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 01, 2019 |  |  |  |  |  |
Loan forgiveness terms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | if the Company created 165 full-time positions and retained 538 full-time positions for two consecutive years (the “Employment Obligation”) as measured on October 28, 2017 (the “Target Date”). The Assistance Agreement was subsequently amended in April 2017 to extend the Target Date by two years to October 28, 2019 |  |  |  |
State of Connecticut [Member] | Employment Obligation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of full time positions required to be created | Position |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 165 |  |  |  |  |  |
Number of full time positions required to be retained | Position |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 538 |  |  |  |  |  |
State of Connecticut [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of loan forgiveness |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
State of Connecticut [Member] | Second Amendment [Member] | Employment Obligation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of minimum full time positions required to be maintained | Employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 538 |  |  |  |  |  |  |
Number of consecutive months maintain the full time positions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24 months |  |  |  |  |  |  |
Additional number of full time positions required to be create | Position |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 91 |  |  |  |  |  |  |
Additional credits to be earned |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |
Principal payable number of employee under employee obligation target |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,587.36 |  |  |  |  |  |  |
Hercules Capital, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000
Long-term Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,426,000 | $ 7,426,000 |  | $ 25,343,000 |  |
Debt instrument, Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.65% | 10.65% |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 22, 2019 |  |  |  |
Interest rate, basis points |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.50% |  |  |  |
Term of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 months |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.90% |  |  |  |
Other Deductions and Charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,700,000 |
Principal payments expected amortizing per month |  |  |  |  |  |  |  | $ 1,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of loan |  | $ 4,000,000 |  |  | $ 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional default interest rate per annum |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued and unpaid default rate interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 | $ 100,000 |  |  |  |
Hercules Capital, Inc. [Member] | Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, amendment description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | The Hercules Agreement contains certain representations and warranties, affirmative and negative covenants, and events of default, including the occurrence of a circumstance that would reasonably be expected to have a material adverse effect, that entitle Hercules to cause the indebtedness under the agreement to become immediately due and payable. The occurrence of an event of default under the Hercules Agreement also constitutes or may result in an event of default under, and causes or may cause the acceleration of, a number of material financial obligations of the Company, including the loan from the State of Connecticut, the loan from Connecticut Green Bank, and the project finance facilities with Generate Lending, PNC and Fifth Third. The occurrence of an event of default under the Hercules Agreement also constitutes a triggering event under the Series D Certificate of Designations. As collateral for obligations under the Hercules Agreement, the Company granted Hercules a security interest in FuelCell Energy, Inc.’s existing and thereafter-acquired assets except for intellectual property and certain other excluded assets. The collateral does not include assets held by FuelCell Finance or any project subsidiary thereof. The Company may continue to collateralize and finance its project subsidiaries through other lenders and partners. |  |  |  |
Hercules Capital, Inc. [Member] | EMRE [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of loan |  |  |  | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hercules Capital, Inc. [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Deductions and Charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 900,000 |  |  |
Hercules Capital, Inc. [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 21, 2019 |  |  |  |
NRG Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,750,000 | $ 5,750,000 |  |  |  |
Non-refundable fee paid |  |  |  |  |  |  |  |  | $ 750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity period description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | The Maturity date of each note payable to NRG is now the date that is the earliest of (a) September 30, 2019, (b) the commercial operation date or substantial completion date, as applicable, with respect to the fuel cell project owned by the co-borrower under such note, and (c) the repayment in full or the closing of a refinancing of the Company’s indebtedness with Hercules. NRG may also accelerate the maturity dates if it determines, in its sole discretion, that the deems that the Company is not making sufficient progress towards the completion of the construction of the 2.8 MW Tulare BioMAT projet in California. |  |  |  |
NRG Energy [Member] | Central CA Fuel Cell 2, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan advance |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,800,000 |  |  |  |  |  |  |  |  |  |
NRG Energy [Member] | Tulare BioMAT [Member] | California [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of plant | MW |  |  | 2.8 |  |  |  |  |  |  |  |  |  | 2.8 |  |  |  |  |  |  |  |  |  |
Generate Lending Construction Loan Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 | $ 10,000,000 |  |  |  |
Generate Lending Construction Loan Agreement [Member] | Generate Lending, LLC [Member] | FuelCell Energy Finance II, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis points |  |  |  |  |  |  |  |  |  |  |  | 9.50% |  |  |  |  |  |  |  |  |  |  |
Loan advance |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |
Percentage of construction budget |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Unlevered internal rate of return percentage to lender |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |
Availability period for working capital loans |  |  |  |  |  |  |  |  |  |  |  | 36 months |  |  |  |  |  |  |  |  |  |  |
Generate Lending Construction Loan Agreement [Member] | Generate Lending, LLC [Member] | California [Member] | FuelCell Energy Finance II, LLC [Member] | Bolthouse Farms [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of plant | MW |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |
Generate Lending Construction Loan Agreement [Member] | Generate Lending, LLC [Member] | Maximum [Member] | FuelCell Energy Finance II, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |
Enhanced Capital Term Loan and Security Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  | $ 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 | $ 1,500,000 |  |  |  |
Interest rate, basis points |  |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity period description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | The loan maturity date is three years from the date of the Enhanced Capital Loan Agreement upon which the outstanding principal and accrued interest will be payable. |  |  |  |
Debt instrument, maturity period |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
New Construction Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  | $ 23,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  | Oct. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Loan advance |  |  |  |  |  |  |  |  |  | $ 9,700,000 |  |  |  |  | $ 1,400,000 |  |  |  |  |  |  |  |
Total outstanding balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,100,000 | $ 11,100,000 |  |  |  |
New Construction Loan Facility [Member] | one-month LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis points |  |  |  |  |  |  |  |  |  | 2.25% |  |  |  |  |  |  |  |  |  |  |  |  |
New Construction Loan Facility [Member] | Groton CT [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of plant | MW |  |  |  |  |  |  |  |  |  | 7.4 |  |  |  |  |  |  |  |  |  |  |  |  |

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