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Consolidated Statements of Changes in Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Treasury Stock [Member] | Deferred Compensation [Member] | Noncontrolling Interest In Subsidiaries [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at at Oct. 31, 2015 | $ 94,754 | $ 3 | $ 934,488 | $ (838,673) | $ (509) | $ (78) | $ 78 | $ (555)
Balance at (in shares) at Oct. 31, 2015 |  | 25,964,710 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Sale of common stock, prepaid warrants and warrants, public offering | 34,736 |  | 34,736 |  |  |  |  |
Sale of common stock, prepaid warrants and warrants, public offering, in shares |  | 1,474,000 |  |  |  |  |  |
Exercise of prepaid warrants, in shares |  | 1,100,000 |  |  |  |  |  |
Sale of common stock | 36,056 | $ 1 | 36,055 |  |  |  |  |
Sale of common stock (in shares) |  | 6,023,372 |  |  |  |  |  |
Common stock issued, non-employee compensation | 157 |  | 157 |  |  |  |  |
Common stock issued, non-employee compensation, in shares |  | 24,379 |  |  |  |  |  |
Share based compensation | 3,425 |  | 3,425 |  |  |  |  |
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans |  | 587,963 |  |  |  |  |  |
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans | (286) |  | (286) |  |  |  |  |
Noncontrolling interest in subsidiaries | (251) |  |  |  |  |  |  | (251)
Purchase of noncontrolling shares of subsidiary | (3) |  | (809) |  |  |  |  | $ 806
Preferred dividends - Series B | (3,200) |  | (3,200) |  |  |  |  |
Adjustment for deferred compensation |  |  |  |  |  |  | 101 |
Adjustment for deferred compensation |  |  |  |  |  | (101) |  |
Effect of foreign currency translation | (35) |  |  |  | (35) |  |  |
Net loss attributable to FuelCell Energy, Inc. | (50,957) |  |  | (50,957) |  |  |  |
Balance at at Oct. 31, 2016 | 114,396 | $ 4 | 1,004,566 | (889,630) | (544) | (179) | 179 |
Balance at (in shares) at Oct. 31, 2016 |  | 35,174,424 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Sale of common stock, warrants and public offering | 13,884 | $ 1 | 13,883 |  |  |  |  |
Sale of common stock, warrants and public offering, in shares |  | 12,000,000 |  |  |  |  |  |
Exercise of prepaid warrants and warrants | 12,722 | $ 1 | 12,721 |  |  |  |  |
Exercise of prepaid warrants and warrants. in shares |  | 13,660,926 |  |  |  |  |  |
Sale of common stock | 12,431 | $ 1 | 12,430 |  |  |  |  |
Sale of common stock (in shares) |  | 7,245,430 |  |  |  |  |  |
Common stock issued, non-employee compensation | 129 |  | 129 |  |  |  |  |
Common stock issued, non-employee compensation, in shares |  | 86,001 |  |  |  |  |  |
Share based compensation | 4,585 |  | 4,585 |  |  |  |  |
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans |  | 1,284,673 |  |  |  |  |  |
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans | (84) |  | (84) |  |  |  |  |
Series C convertible preferred stock conversions | 167 |  | 167 |  |  |  |  |
Series C convertible preferred stock conversions, shares |  | 108,696 |  |  |  |  |  |
Noncontrolling interest in subsidiaries | 0 |  |  |  |  |  |  |
Preferred dividends - Series B | (3,200) |  | (3,200) |  |  |  |  |
Adjustment for deferred compensation |  |  |  |  |  |  | 101 |
Adjustment for deferred compensation |  |  |  |  |  | (101) |  |
Effect of foreign currency translation | 129 |  |  |  | 129 |  |  |
Net loss attributable to FuelCell Energy, Inc. | (53,903) |  |  | (53,903) |  |  |  |
Adjustment for deferred compensation (in shares) |  | (67,334) |  |  |  |  |  |
Balance at at Oct. 31, 2017 | $ 101,256 | $ 7 | 1,045,197 | (943,533) | (415) | (280) | 280 |
Balance at (in shares) at Oct. 31, 2017 | 69,492,816 | 69,492,816 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Sale of common stock | $ 7,129 | $ 1 | 7,128 |  |  |  |  |
Sale of common stock (in shares) |  | 5,715,180 |  |  |  |  |  |
Exercise of warrants | 3,326 |  | 3,326 |  |  |  |  |
Exercise of warrants, in shares |  | 2,595,710 |  |  |  |  |  |
Common stock issued, non-employee compensation | 282 |  | 282 |  |  |  |  |
Common stock issued, non-employee compensation, in shares |  | 158,708 |  |  |  |  |  |
Share based compensation | 3,238 |  | 3,238 |  |  |  |  |
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans |  | (178,950) |  |  |  |  |  |
Taxes paid upon vesting of restricted stock awards, net of stock issued under benefit plans | (660) |  | (660) |  |  |  |  |
Series C convertible preferred stock conversions | 20,220 | $ 2 | 20,218 |  |  |  |  |
Series C convertible preferred stock conversions, shares |  | 17,956,413 |  |  |  |  |  |
Noncontrolling interest in subsidiaries | 0 |  |  |  |  |  |  |
Preferred dividends - Series B | (3,200) |  | (3,200) |  |  |  |  |
Series D Preferred stock redemption accretion | (2,075) |  | (2,075) |  |  |  |  |
Adjustment for deferred compensation |  |  |  |  |  |  | 83 |
Adjustment for deferred compensation |  |  |  |  |  | (83) |  |
Effect of foreign currency translation | 12 |  |  |  | 12 |  |  |
Net loss attributable to FuelCell Energy, Inc. | (47,334) |  |  | (47,334) |  |  |  |
Adjustment for deferred compensation (in shares) |  | (67,640) |  |  |  |  |  |
Balance at at Oct. 31, 2018 | $ 82,194 | $ 10 | $ 1,073,454 | $ (990,867) | $ (403) | $ (363) | $ 363 |
Balance at (in shares) at Oct. 31, 2018 | 95,672,237 | 95,672,237 |  |  |  |  |  |

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