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Subsequent Events - Additional Information (Details) |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |
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Sep. 04, 2019 USD ($) | Aug. 15, 2019 USD ($) | Aug. 13, 2019 USD ($) MW | Aug. 08, 2019 USD ($) $ / shares MW | Aug. 08, 2019 USD ($) $ / shares shares | Jun. 28, 2019 | May 15, 2019 USD ($) | Dec. 21, 2018 USD ($) | Jul. 31, 2019 USD ($) shares | Apr. 30, 2019 USD ($) | Jan. 31, 2019 USD ($) | Jul. 31, 2018 USD ($) shares | Apr. 30, 2018 USD ($) | Jan. 31, 2018 USD ($) | Jul. 31, 2019 USD ($) | Jul. 31, 2018 USD ($) | Aug. 12, 2019 USD ($) | Oct. 31, 2018 USD ($)
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared |  |  |  |  |  |  |  |  |  | $ 800,000 | $ 800,000 | $ 800,000 | $ 800,000 | $ 800,000 |  |  |  |
Sale of common stock, net of fees |  |  |  |  |  |  |  |  | $ 16,199,000 |  |  | $ 6,745,000 |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of common stock, net of fees (in shares) | shares |  |  |  |  |  |  |  |  | 43,997,807 |  |  | 435,329 |  |  |  |  |  |
Sale of common stock, net of fees |  |  |  |  |  |  |  |  | $ 3,000 |  |  |  |  |  |  |  |  |
Series B Cumulative Convertible Perpetual Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared |  |  |  |  |  |  | $ 0 |  | 810,000 |  |  | $ 800,000 |  |  | $ 2,410,000 | $ 2,400,000 |  |
Dividends payment date |  |  |  |  |  |  | May 15, 2019 |  |  |  |  |  |  |  |  |  |  |
Aggregate amount of dividend payment |  |  |  |  |  |  | $ 800,000 |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  | 5.00% | 5.00% |  |
Preferred stock failed to pay dividend payments multiplier percentage |  |  |  |  |  |  | 0.0625% |  |  |  |  |  |  |  |  |  |  |
Dividends payable |  |  |  |  |  |  |  |  | 810,000 |  |  |  |  |  | $ 810,000 |  |  |
Subsequent Event [Member] | Series B Cumulative Convertible Perpetual Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payment date |  | Aug. 15, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount of dividend payment |  | $ 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock failed to pay dividend payments multiplier percentage |  | 0.0625% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable |  | $ 830,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
B. Riley FBR, Inc and Oppenheimer & Co. Inc. [Member] | Subsequent Event [Member] | Sales Agreement [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of common stock, net of fees (in shares) | shares |  |  |  |  | 7,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Average sale of stock price per share | $ / shares |  |  |  | $ 0.31 | $ 0.31 |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from sale of common stock |  |  |  |  | $ 2,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Sales commissions paid to agent |  |  |  |  | 70,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds on sales agreement |  |  |  |  | $ 2,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of common stock, net of fees | $ 27,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
B. Riley FBR, Inc and Oppenheimer & Co. Inc. [Member] | Subsequent Event [Member] | Sales Agreement [Member] | Common Stock [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock to be sold during period value new issues | $ 22,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NRG Energy, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 40,000,000
NRG Energy, Inc. [Member] | Six Amendment [Member] | Central CA Fuel Cell 2, LLC [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
NRG Energy, Inc. [Member] | Six Amendment [Member] | Tulare BioMAT [Member] | California [Member] | Central CA Fuel Cell 2, LLC [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of plant | MW |  |  |  | 2.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generate Lending Construction Loan Agreement [Member] | Generate Lending, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, optional call right notice period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 days |  |  |
Line of credit facility, optional call right |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Pursuant to the terms of the Generate Agreement, Generate Lending had an optional call right which, if exercised, was required to be noticed during the ten day period beginning on June 20, 2019 and ending on (and including) June 30, 2019 (as amended or modified from time to time, the “Call Right”). If Generate Lending had exercised its Call Right during that period, all of the Working Capital Loans (as described elsewhere herein) (in an amount equal to $10,000,000), together with all accrued and unpaid interest thereon, would have been due and payable in their entirety, without penalty or premium, prior to September 30, 2019. |  |  |
Line of credit facility, optional call right beginning date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 20, 2019 |  |  |
Line of credit facility, optional call right ending date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 30, 2019 |  |  |
Line of credit facility, optional call right amount |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  | $ 10,000,000 |  |  |
Generate Lending Construction Loan Agreement [Member] | FuelCell Energy Finance II, LLC [Member] | Generate Lending, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidation damages amount |  |  |  |  |  |  |  | $ 650,000 |  |  |  |  |  |  |  |  |  |
Generate Lending Construction Loan Agreement [Member] | First Generate Amendment [Member] | FuelCell Energy Finance II, LLC [Member] | Generate Lending, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, optional call right notice period |  |  |  |  |  | 10 days |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, optional call right |  |  |  |  |  | On June 28, 2019, FCEF II, Generate Lending, and various project company guarantors entered into the First Amendment to the Generate Agreement (the “First Generate Amendment”). Under the First Generate Amendment, the Call Right was modified to give Generate Lending the right to exercise the Call Right, requiring payment of all Working Capital Loans and all accrued and unpaid interest thereon on September 30, 2019, during the ten day period beginning on August 1, 2019 and ending on (and including) August 11, 2019. Concurrently with the execution of the First Generate Amendment, the Company, FCEF II and Generate Lending entered into the First Amendment to the Right to Finance Agreement, which provided that, if Generate Lending exercised its Call Right, the Right to Finance Agreement (as amended) would terminate. |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, optional call right beginning date |  |  |  |  |  | Aug. 01, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, optional call right ending date |  |  |  |  |  | Aug. 11, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Generate Lending Construction Loan Agreement [Member] | Second Generate Amendment [Member] | Subsequent Event [Member] | FuelCell Energy Finance II, LLC [Member] | Generate Lending, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Power and generate period of working capital loans |  |  | 3 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generate Lending Construction Loan Agreement [Member] | Second Generate Amendment [Member] | Brookhaven, New York [Member] | Subsequent Event [Member] | FuelCell Energy Finance II, LLC [Member] | Generate Lending, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of plant | MW |  |  | 7.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fifth Third Bank Construction Loan Agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 23,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,000,000 |

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