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Consolidated Statements of Changes in Equity - USD ($) $ in Thousands | Total | Series D Preferred Stock [Member] | Series C Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Additional Paid-in Capital [Member] Series D Preferred Stock [Member] | Additional Paid-in Capital [Member] Series C Preferred Stock [Member] | Accumulated Deficit [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Treasury Stock [Member] | Deferred Compensation [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at at Oct. 31, 2017 | $ 101,256 |  |  | $ 1 | $ 1,045,203 |  |  | $ (943,533) | $ (415) | $ (280) | $ 280
Balance at (in shares) at Oct. 31, 2017 |  |  |  | 5,791,068 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Exercise of warrants | 2,647 |  |  |  | 2,647 |  |  |  |  |  |
Exercise of warrants, (in shares) |  |  |  | 172,200 |  |  |  |  |  |  |
Share based compensation | 617 |  |  |  | 617 |  |  |  |  |  |
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans | (75) |  |  |  | (75) |  |  |  |  |  |
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans, (in shares) |  |  |  | (8,912) |  |  |  |  |  |  |
Series C convertible preferred stock conversions | 7,569 |  |  |  | 7,569 |  |  |  |  |  |
Series C convertible preferred stock conversions, (in shares) |  |  |  | 512,487 |  |  |  |  |  |  |
Preferred stock dividends | (800) |  |  |  | (800) |  |  |  |  |  |
Effect of foreign currency translation | 33 |  |  |  |  |  |  |  | 33 |  |
Net loss attributable to FuelCell Energy, Inc. | (4,183) |  |  |  |  |  |  | (4,183) |  |  |
Balance at at Jan. 31, 2018 | 107,064 |  |  | $ 1 | 1,055,161 |  |  | (947,716) | (382) | (280) | 280
Balance at (in shares) at Jan. 31, 2018 |  |  |  | 6,466,843 |  |  |  |  |  |  |
Balance at at Oct. 31, 2017 | 101,256 |  |  | $ 1 | 1,045,203 |  |  | (943,533) | (415) | (280) | 280
Balance at (in shares) at Oct. 31, 2017 |  |  |  | 5,791,068 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Series C convertible preferred stock conversions, (in shares) |  |  | 3,914,218 |  |  |  |  |  |  |  |
Effect of foreign currency translation | (41) |  |  |  |  |  |  |  |  |  |
Net loss attributable to FuelCell Energy, Inc. | (33,238) |  |  |  |  |  |  |  |  |  |
Balance at at Jul. 31, 2018 | 95,508 |  |  | $ 1 | 1,072,734 |  |  | (976,771) | (456) | (447) | 447
Balance at (in shares) at Jul. 31, 2018 |  |  |  | 7,690,014 |  |  |  |  |  |  |
Balance at at Jan. 31, 2018 | 107,064 |  |  | $ 1 | 1,055,161 |  |  | (947,716) | (382) | (280) | 280
Balance at (in shares) at Jan. 31, 2018 |  |  |  | 6,466,843 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Exercise of warrants | 621 |  |  |  | 621 |  |  |  |  |  |
Exercise of warrants, (in shares) |  |  |  | 44,109 |  |  |  |  |  |  |
Common stock issued, non-employee compensation | 282 |  |  |  | 282 |  |  |  |  |  |
Common stock issued, non-employee compensation, (in shares) |  |  |  | 10,066 |  |  |  |  |  |  |
Share based compensation | 761 |  |  |  | 761 |  |  |  |  |  |
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans | (546) |  |  |  | (546) |  |  |  |  |  |
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans, (in shares) |  |  |  | (1,282) |  |  |  |  |  |  |
Series C convertible preferred stock conversions | 8,029 |  |  |  | 8,029 |  |  |  |  |  |
Series C convertible preferred stock conversions, (in shares) |  |  |  | 559,844 |  |  |  |  |  |  |
Preferred stock dividends | (800) |  |  |  | (800) |  |  |  |  |  |
Effect of foreign currency translation | 54 |  |  |  |  |  |  |  | 54 |  |
Adjustment for deferred compensation |  |  |  |  |  |  |  |  |  |  | 167
Adjustment for deferred compensation, (in shares) |  |  |  | (4,683) |  |  |  |  |  |  |
Adjustment for deferred compensation |  |  |  |  |  |  |  |  |  | (167) |
Net loss attributable to FuelCell Energy, Inc. | (13,174) |  |  |  |  |  |  | (13,174) |  |  |
Balance at at Apr. 30, 2018 | 102,291 |  |  | $ 1 | 1,063,508 |  |  | (960,890) | (328) | (447) | 447
Balance at (in shares) at Apr. 30, 2018 |  |  |  | 7,074,897 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Sale of common stock, net of fees | 6,745 |  |  |  | 6,745 |  |  |  |  |  |
Sale of common stock, net of fees (in shares) |  |  |  | 435,329 |  |  |  |  |  |  |
Share based compensation | 931 |  |  |  | 931 |  |  |  |  |  |
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans | (35) |  |  |  | (35) |  |  |  |  |  |
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans, (in shares) |  |  |  | 1,403 |  |  |  |  |  |  |
Series C convertible preferred stock conversions | 2,385 |  |  |  | 2,385 |  |  |  |  |  |
Series C convertible preferred stock conversions, (in shares) |  |  |  | 181,191 |  |  |  |  |  |  |
Preferred stock dividends | (800) |  |  |  | (800) |  |  |  |  |  |
Effect of foreign currency translation | (128) |  |  |  |  |  |  |  | (128) |  |
Net loss attributable to FuelCell Energy, Inc. | (15,881) |  |  |  |  |  |  | (15,881) |  |  |
Balance at at Jul. 31, 2018 | 95,508 |  |  | $ 1 | 1,072,734 |  |  | (976,771) | (456) | (447) | 447
Balance at (in shares) at Jul. 31, 2018 |  |  |  | 7,690,014 |  |  |  |  |  |  |
Balance at at Oct. 31, 2018 | $ 82,194 |  |  | $ 1 | 1,073,463 |  |  | (990,867) | (403) | (363) | 363
Balance at (in shares) at Oct. 31, 2018 | 7,972,686 |  |  | 7,972,686 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Share based compensation | $ 987 |  |  |  | 987 |  |  |  |  |  |
Fee adjustment for common stock issuance | 90 |  |  |  | 90 |  |  |  |  |  |
Common stock issued under benefit plans, net of taxes paid upon vesting of restricted stock awards | 27 |  |  |  | 27 |  |  |  |  |  |
Common stock issued under benefit plans, net of taxes paid upon vesting of restricted stock awards, (in shares) |  |  |  | 1,946 |  |  |  |  |  |  |
Series C convertible preferred stock conversions | 1,974 |  |  |  | 1,974 |  |  |  |  |  |
Series C convertible preferred stock conversions, (in shares) |  |  |  | 127,829 |  |  |  |  |  |  |
Series C convertible preferred stock adjustment for beneficial conversion feature | 6,586 |  |  |  | 6,586 |  |  |  |  |  |
Series C convertible stock redemption value adjustments | (8,550) |  |  |  | (8,550) |  |  |  |  |  |
Series D convertible preferred stock conversions | 4,334 |  |  |  | 4,334 |  |  |  |  |  |
Series D convertible preferred stock conversions, (in shares) |  |  |  | 932,144 |  |  |  |  |  |  |
Convertible preferred stock redemption accretion |  | $ (3,793) |  |  |  | $ (3,793) |  |  |  |  |
Preferred stock dividends | (800) |  |  |  | (800) |  |  |  |  |  |
Impact of the adoption of Topic 606 | (6,654) |  |  |  |  |  |  | (6,654) |  |  |
Effect of foreign currency translation | 7 |  |  |  |  |  |  |  | 7 |  |
Net loss attributable to FuelCell Energy, Inc. | (17,548) |  |  |  |  |  |  | (17,548) |  |  |
Balance at at Jan. 31, 2019 | 58,854 |  |  | $ 1 | 1,074,318 |  |  | (1,015,069) | (396) | (363) | 363
Balance at (in shares) at Jan. 31, 2019 |  |  |  | 9,034,605 |  |  |  |  |  |  |
Balance at at Oct. 31, 2018 | $ 82,194 |  |  | $ 1 | 1,073,463 |  |  | (990,867) | (403) | (363) | 363
Balance at (in shares) at Oct. 31, 2018 | 7,972,686 |  |  | 7,972,686 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Effect of foreign currency translation | $ (28) |  |  |  |  |  |  |  |  |  |
Net loss attributable to FuelCell Energy, Inc. | (42,389) |  |  |  |  |  |  |  |  |  |
Balance at at Jul. 31, 2019 | $ 84,883 |  |  | $ 12 | 1,125,212 |  |  | (1,039,910) | (431) | (466) | 466
Balance at (in shares) at Jul. 31, 2019 | 118,387,637 |  |  | 118,387,637 |  |  |  |  |  |  |
Balance at at Jan. 31, 2019 | $ 58,854 |  |  | $ 1 | 1,074,318 |  |  | (1,015,069) | (396) | (363) | 363
Balance at (in shares) at Jan. 31, 2019 |  |  |  | 9,034,605 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Common stock issued, non-employee compensation | 102 |  |  |  | 102 |  |  |  |  |  |
Common stock issued, non-employee compensation, (in shares) |  |  |  | 29,454 |  |  |  |  |  |  |
Share based compensation | 955 |  |  |  | 955 |  |  |  |  |  |
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans | (219) |  |  |  | (219) |  |  |  |  |  |
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans, (in shares) |  |  |  | 52,784 |  |  |  |  |  |  |
Series A warrant exchange, (in shares) |  |  |  | 500,000 |  |  |  |  |  |  |
Series C convertible preferred stock conversions | 10,355 |  |  |  | 10,355 |  |  |  |  |  |
Series C convertible preferred stock conversions, (in shares) |  |  |  | 2,127,528 |  |  |  |  |  |  |
Series D convertible preferred stock conversions | 6,305 |  |  |  | 6,305 |  |  |  |  |  |
Series D convertible preferred stock conversions, (in shares) |  |  |  | 1,994,413 |  |  |  |  |  |  |
Convertible preferred stock redemption accretion |  |  | $ (6,047) |  |  |  | $ (6,047) |  |  |  |
Preferred stock dividends | (800) |  |  |  | (800) |  |  |  |  |  |
Effect of foreign currency translation | (140) |  |  |  |  |  |  |  | (140) |  |
Adjustment for deferred compensation |  |  |  |  |  |  |  |  |  |  | 103
Adjustment for deferred compensation, (in shares) |  |  |  | (29,454) |  |  |  |  |  |  |
Adjustment for deferred compensation |  |  |  |  |  |  |  |  |  | (103) |
Net loss attributable to FuelCell Energy, Inc. | (19,530) |  |  |  |  |  |  | (19,530) |  |  |
Balance at at Apr. 30, 2019 | 49,835 |  |  | $ 1 | 1,084,969 |  |  | (1,034,599) | (536) | (466) | 466
Balance at (in shares) at Apr. 30, 2019 |  |  |  | 13,709,330 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Sale of common stock, net of fees | 16,199 |  |  | $ 3 | 16,196 |  |  |  |  |  |
Sale of common stock, net of fees (in shares) |  |  |  | 43,997,807 |  |  |  |  |  |  |
Share based compensation | 383 |  |  |  | 383 |  |  |  |  |  |
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans | (9) |  |  |  | (9) |  |  |  |  |  |
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans, (in shares) |  |  |  | 437 |  |  |  |  |  |  |
Series C convertible preferred stock conversions | 3,162 |  |  | $ 2 | 3,160 |  |  |  |  |  |
Series C convertible preferred stock conversions, (in shares) |  |  | 1,658,861 | 1,658,861 |  |  |  |  |  |  |
Series D convertible preferred stock conversions | 20,519 |  |  | $ 6 | 20,513 |  |  |  |  |  |
Series D convertible preferred stock conversions, (in shares) |  |  |  | 59,021,202 |  |  |  |  |  |  |
Effect of foreign currency translation | 105 |  |  |  |  |  |  |  | 105 |  |
Net loss attributable to FuelCell Energy, Inc. | (5,311) |  |  |  |  |  |  | (5,311) |  |  |
Balance at at Jul. 31, 2019 | $ 84,883 |  |  | $ 12 | $ 1,125,212 |  |  | $ (1,039,910) | $ (431) | $ (466) | $ 466
Balance at (in shares) at Jul. 31, 2019 | 118,387,637 |  |  | 118,387,637 |  |  |  |  |  |  |

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