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Debt and Financing Obligation - Additional Information (Details) |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2019 USD ($) | Jan. 09, 2019 USD ($) | Dec. 31, 2018 | Dec. 21, 2018 USD ($) Project MW | Dec. 13, 2018 USD ($) MW | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 28, 2018 USD ($) | Jan. 31, 2019 USD ($) Position Employee | Nov. 30, 2015 USD ($) Position | Jan. 31, 2019 USD ($) | Jan. 31, 2018 USD ($) | Oct. 31, 2017 | Oct. 31, 2016 USD ($) | Apr. 01, 2020 USD ($) | Apr. 01, 2019 | Oct. 31, 2018 USD ($) | Oct. 01, 2018 USD ($) | Nov. 30, 2016 USD ($) | Apr. 30, 2016 USD ($) | Mar. 05, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  |  | $ 17,250,000 | $ 0 |  |  |  |  |  |  |  |  |
Lease payment term | 36 months |  |  |  |  |  |  |  | 36 months |  | 36 months |  |  |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Optional project financing term |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Connecticut Green Bank Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,900,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00%
Long-term Line of Credit | $ 6,052,000 |  |  |  |  |  |  |  | $ 6,052,000 |  | $ 6,052,000 |  |  |  |  |  | $ 6,052,000 |  |  |  |
PNC Energy Capital, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit | 45,700,000 |  |  |  |  |  |  |  | 45,700,000 |  | $ 45,700,000 |  |  |  |  |  | 46,100,000 |  |  |  |
Term of loan |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
State of Connecticut [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | 10,000,000 |  |  |  |  |  |  |  | $ 10,000,000 | $ 10,000,000 | $ 10,000,000 |  |  |  |  |  | 10,000,000 |  |  |  |
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 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] | Employment Obligation [Member] | Second Amendment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of 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 |  |  |  |  |  |  |  | $ 2,000,000 |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |
State of Connecticut [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of loan forgiveness | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hercules Capital, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 25,000,000 |  |  |  |  |  |  |  | 25,000,000 |  | 25,000,000 |  |  |  |  |  |  |  |  | $ 25,000,000 |
Long-term Line of Credit | $ 25,488,000 |  |  |  |  |  |  | $ 11,900,000 | $ 25,488,000 |  | $ 25,488,000 |  |  |  |  |  | 25,343,000 |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000,000 |  |  |  |  |  |  |
Term of loan |  |  |  |  |  |  |  |  |  |  | 30 months |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range |  |  | 10.90% |  |  | 10.65% | 10.40% | 10.15% |  |  | 9.90% |  |  |  |  |  |  |  |  |  |
Other Deductions and Charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 | $ 1,700,000 |  |  |
Loan Advance |  |  |  |  |  |  |  | $ 13,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan Maturity Date |  |  |  |  |  |  |  |  |  |  | Apr. 01, 2020 |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  |  |  |  |  |  | 4.50% |  |  |  |  |  |  |  |  |  |
Hercules Capital, Inc. [Member] | Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, amendment description |  |  |  |  |  |  |  |  |  |  | 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 Energy Finance, LLC (“FuelCell Finance”) or any project subsidiary thereof. The Company may continue to collateralize and finance its project subsidiaries through other lenders and partners. As of January 31, 2019, the Hercules Agreement, as amended, included a minimum cash covenant requiring the Company to maintain an unrestricted cash balance in accounts subject to an account control agreement in favor of Hercules of at least the greater of (a) 75% of the outstanding loan balance plus (b) the amount of accounts payable (as defined under GAAP) not paid within 90 days of the invoice date. (See Note 17, “Subsequent Events” for a discussion of a further amendment to the Hercules Agreement and the minimum cash covenant.) The Hercules Agreement, as amended, contains customary representations and warranties, affirmative and negative covenants, and events of default that entitle Hercules to cause the indebtedness under the agreement to become immediately due and payable. |  |  |  |  |  |  |  |  |  |
Cash covenant minimum required percentage of unrestricted cash balance on outstanding loan balance and accounts payable | 75.00% |  |  |  |  |  |  |  | 75.00% |  | 75.00% |  |  |  |  |  |  |  |  |  |
Hercules Capital, Inc. [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Deductions and Charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 900,000 |  |  |  |  |  |
Cash covenant minimum required percentage of unrestricted cash balance on outstanding loan balance and accounts payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |
Hercules Capital, Inc. [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |
Hercules Capital, Inc. [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range |  |  |  |  |  |  |  |  |  |  |  |  | 9.75% |  |  |  |  |  |  |  |
Webster Bank Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |
Notes Payable to Bank, Current | $ 1,000,000 |  |  |  |  |  |  |  | $ 1,000,000 |  | $ 1,000,000 |  |  |  |  |  | $ 1,100,000 |  | $ 2,300,000 |  |
NRG Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 40,000,000 |  |  |  |  |  |  |  | 40,000,000 |  | 40,000,000 |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit | 5,750,000 |  |  |  | $ 0 |  |  |  | 5,750,000 |  | $ 5,750,000 |  |  |  |  |  |  |  |  |  |
NRG Energy [Member] | Tulare BioMAT [Member] | California [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of Plant | MW |  |  |  |  | 2.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NRG Energy [Member] | Central CA Fuel Cell 2, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan Advance |  |  |  |  | $ 5,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NRG Energy [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range |  |  |  |  |  |  |  |  |  |  | 8.50% |  |  |  |  |  |  |  |  |  |
NRG Energy [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |
Generate Lending Construction Loan Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit | 10,000,000 |  |  |  |  |  |  |  | 10,000,000 |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |
Generate Lending Construction Loan Agreement [Member] | FuelCell Energy Finance II, LLC [Member] | Generate Lending, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan Advance |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  | 9.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of construction budget |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unlevered internal rate of return percentage to lender |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Availability period for working capital loans |  |  |  | 36 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity ownership |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price adjustment |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Draw down fee percentage |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposition fee percentage of total sale price |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generate Lending Construction Loan Agreement [Member] | FuelCell Energy Finance II, LLC [Member] | Generate Lending, LLC [Member] | PSEG Long Island [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of Plant | MW |  |  |  | 39.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of projects expected to be completed | Project |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generate Lending Construction Loan Agreement [Member] | FuelCell Energy Finance II, LLC [Member] | Generate Lending, LLC [Member] | DEEP RFP [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of Plant | MW |  |  |  | 22.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of projects expected to be completed | Project |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generate Lending Construction Loan Agreement [Member] | California [Member] | FuelCell Energy Finance II, LLC [Member] | Generate Lending, LLC [Member] | Bolthouse Farms [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of Plant | MW |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generate Lending Construction Loan Agreement [Member] | Maximum [Member] | FuelCell Energy Finance II, LLC [Member] | Generate Lending, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generate Lending Construction Loan Agreement [Member] | Minimum [Member] | FuelCell Energy Finance II, LLC [Member] | Generate Lending, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unlevered internal rate of return percentage to lender |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
After-tax yield percentage |  |  |  | 12.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate working capital loan amount minimum limit |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate working capital loan amount maximum limit |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposition fee percentage |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tranche Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate working capital loan amount minimum limit |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate working capital loan amount maximum limit |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposition fee percentage |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enhanced Capital 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 |  | $ 1,500,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
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