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Subsequent Events - Additional Information (Details) |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |
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Jun. 26, 2019 USD ($) | Jun. 17, 2019 USD ($) shares | Jun. 11, 2019 USD ($) | Jun. 10, 2019 $ / shares shares | May 15, 2019 USD ($) | May 09, 2019 USD ($) MW | May 08, 2019 USD ($) | Apr. 30, 2019 USD ($) shares | Jan. 31, 2019 USD ($) | Apr. 30, 2018 USD ($) | Jan. 31, 2018 USD ($) | Apr. 30, 2019 USD ($) TradingDay shares | Apr. 30, 2018 USD ($) | Jun. 13, 2019 USD ($) shares | May 01, 2019 | Apr. 01, 2019 | Mar. 29, 2019 | Feb. 28, 2019 | Oct. 31, 2018 USD ($) shares | Aug. 29, 2018 shares
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divend declared |  |  |  |  |  |  |  | $ 800,000 | $ 800,000 | $ 800,000 | $ 800,000 |  |  |  |  |  |  |  |  |
Convertible preferred stock, reduction in carrying amount |  |  |  |  |  |  |  | 10,400,000 |  |  |  | $ 12,300,000 |  |  |  |  |  |  |  |
Series B Cumulative Convertible Perpetual Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divend declared |  |  |  |  |  |  |  | 800,000 |  | $ 800,000 |  | $ 1,600,000 | $ 1,600,000 |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  |  |  |  |  |  |  |  | 5.00% | 5.00% |  |  |  |  |  |  |
Temporary equity, carrying amount, attributable to parent |  |  |  |  |  |  |  | $ 59,857,000 |  |  |  | $ 59,857,000 |  |  |  |  |  |  | $ 59,857,000 |
Preferred stock sale of shares | shares |  |  |  |  |  |  |  | 64,020 |  |  |  | 64,020 |  |  |  |  |  |  | 64,020 |
Preferred stock shares outstanding | shares |  |  |  |  |  |  |  | 64,020 |  |  |  | 64,020 |  |  |  |  |  |  | 64,020 |
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |
Convertible preferred stock, converted into common stock | shares |  |  |  |  |  |  |  | 5,852 |  |  |  | 7,374 |  |  |  |  |  |  |  |
Temporary equity, carrying amount, attributable to parent |  |  |  |  |  |  |  | $ 3,162,000 |  |  |  | $ 3,162,000 |  |  |  |  |  |  | $ 7,480,000 |
Redemption pice percentage |  |  |  |  |  |  |  |  |  |  |  | 125.00% |  |  |  |  |  |  |  |
Series D Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |
Convertible preferred stock, converted into common stock | shares |  |  |  |  |  |  |  | 6,964 |  |  |  | 12,218 |  |  |  |  |  |  |  |
Temporary equity, carrying amount, attributable to parent |  |  |  |  |  |  |  | $ 20,546,000 |  |  |  | $ 20,546,000 |  |  |  |  |  |  | $ 27,392,000 |
Reduced conversion price | $ / shares |  |  |  | $ 0.4619 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of lowest volume weighted average price of common stock considered as conversion price |  |  |  |  |  |  |  |  |  |  |  | 85.00% |  |  |  |  |  |  |  |
Number of consecutive trading days | TradingDay |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |
Preferred stock sale of shares | shares |  |  |  |  |  |  |  | 18,462 |  |  |  | 18,462 |  | 8,396 |  |  |  |  | 30,680 | 30,680
Preferred stock shares outstanding | shares |  |  |  |  |  |  |  | 18,462 |  |  |  | 18,462 |  | 8,396 |  |  |  |  | 30,680 |
Preferred stock liquidation value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,400,000 |  |  |  |  |  |
Redemption pice percentage |  |  |  |  |  |  |  |  |  |  |  | 125.00% |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued due to conversion of series D preferred shares | shares |  |  |  | 12,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hercules Capital, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement, maturity date |  |  |  |  |  |  |  |  |  |  |  | Apr. 01, 2020 |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  | 4.50% |  |  |  |  |  |  |  |
Cash covenant minimum required percentage of unrestricted cash balance on outstanding loan balance and accounts payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.00% | 75.00% | 50.00% | 50.00% |  |
Hercules Capital, Inc. [Member] | Scenario Forecast [Member] | EMRE [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of loan | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Default interest rate per annum |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment charge payment waive percentage on outstanding loan |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible preferred stock, converted into number of common stock shares | shares |  | 1,658,861 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Series B Cumulative Convertible Perpetual Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divend declared |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payment date |  |  |  |  | May 15, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount of dividend payment |  |  |  |  | $ 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible preferred stock, converted into common stock | shares |  | 1,618 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible preferred stock, reduction in carrying amount |  | $ 3,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity, carrying amount, attributable to parent |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | EMRE [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
License agreement payment | $ 4,000,000 |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Hercules Capital, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-refundable fee paid |  |  |  |  |  |  | $ 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of loan |  |  | 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal balance |  |  | $ 20,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Hercules Capital, Inc. [Member] | Commencing on May 1, 2019 through 2:00 pm Eastern Time on June 7, 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash covenant minimum required percentage of unrestricted cash balance on outstanding loan balance and accounts payable |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Hercules Capital, Inc. [Member] | After 2:00 pm Eastern Time on June 7, 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash covenant minimum required percentage of unrestricted cash balance on outstanding loan balance and accounts payable |  |  |  |  |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Bridgeport Fuel Cell, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, purchase price |  |  |  |  |  | $ 35,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Working capital post-closing adjustment for purchase price |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash on hand |  |  |  |  |  | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Bridgeport Fuel Cell, LLC [Member] | Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement, maturity date |  |  |  |  |  | May 09, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate description |  |  |  |  |  | The interest rate under the Credit Agreement fluctuates monthly at the 30-day LIBOR rate plus 275 basis points |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate basis term |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 2.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, total notional value |  |  |  |  |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, covenant terms |  |  |  |  |  | The 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 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 (as described below). BFC is also required to maintain a debt service coverage ratio of not less than 1.20, measured annually. The Credit Agreement contains customary representations, warranties and covenants. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Bridgeport Fuel Cell, LLC [Member] | Credit Agreement [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt service coverage ratio |  |  |  |  |  | 120.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Bridgeport Fuel Cell, LLC [Member] | Credit Agreement [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, fixed rate of interest |  |  |  |  |  | 2.34% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, floating index rate |  |  |  |  |  | 2.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net interest rate |  |  |  |  |  | 5.09% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Bridgeport Fuel Cell, LLC [Member] | Credit Agreement [Member] | Fifth Third Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [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% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Bridgeport Fuel Cell, LLC [Member] | Credit Agreement [Member] | Liberty Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [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% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Bridgeport Fuel Cell, LLC [Member] | Subordinated Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from long-term lines of credit |  |  |  |  |  | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, covenant terms |  |  |  |  |  | In addition, 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”), $1.8 million of which was used to collateralize a letter of credit issued by Liberty Bank to satisfy a performance assurance requirement in the Energy Purchase Agreement with Connecticut Light and Power Company and the balance of which was applied toward outstanding principal on the Company’s existing indebtedness to Connecticut Green Bank. 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 (senior term loan amount) loaned under the Credit Agreement, in all of the same collateral securing the Credit Agreement. The interest rate under the Subordinated Credit Agreement is 8% per annum. A commitment fee of $60.0 thousand was earned by Connecticut Green Bank in connection with the closing. The debt service coverage ratio required to be maintained under the Subordinated Credit Agreement may not be less than 1.10 as of the end of each fiscal quarter. The term of the Subordinated Credit Agreement expires 7 years from the date of the advance of the loan. Principal and interest are due monthly in amounts sufficient to fully amortize the loan over an 84 month period. However, monthly debt service payments can accumulate in arrearages in the event that BFC does not have sufficient cash to make any monthly debt service payment. BFC has the right to make additional principal payments or pay the balance in full at any time without additional fees or penalties. The Subordinated Credit Agreement also contains customary representations, warranties and covenants. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, commitment fee |  |  |  |  |  | $ 60,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
DebtInstrument term |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Bridgeport Fuel Cell, LLC [Member] | Subordinated Credit Agreement [Member] | Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit collateral |  |  |  |  |  | $1.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Bridgeport Fuel Cell, LLC [Member] | Subordinated Credit Agreement [Member] | Senior Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liens securing senior term loan amount |  |  |  |  |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Bridgeport Fuel Cell, LLC [Member] | Subordinated Credit Agreement [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt service coverage ratio |  |  |  |  |  | 110.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Bridgeport Fuel Cell, LLC [Member] | Bridgeport, Connecticut [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of Plant | MW |  |  |  |  |  | 14.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plant operation period |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Capacity of plant. + References No definition available. + Details
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Namespace Prefix: | fcel_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cash covenant minimum required percentage of unrestricted cash balance on outstanding loan balance and accounts payable. + References No definition available. + Details
Name: | fcel_CashCovenantMinimumRequiredPercentageOfUnrestrictedCashBalanceOnOutstandingLoanBalanceAndAccountsPayable
Namespace Prefix: | fcel_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt instrument, interest rate basis term. + References No definition available. + Details
Name: | fcel_DebtInstrumentInterestRateBasisTerm
Namespace Prefix: | fcel_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt instrument non-refundable fee paid. + References No definition available. + Details
Name: | fcel_DebtInstrumentNonRefundableFeePaid
Namespace Prefix: | fcel_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Debt service coverage ratio. + References No definition available. + Details
Name: | fcel_DebtServiceCoverageRatio
Namespace Prefix: | fcel_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Debt service reserves required to be maintained and held in deposit accounts. + References No definition available. + Details
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