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Pay vs Performance Disclosure - USD ($) | 12 Months Ended
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Oct. 31, 2023 | Oct. 31, 2022 | Oct. 31, 2021
Pay vs Performance Disclosure |  |  |
Pay vs Performance Disclosure, Table | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Value of Initial Fixed $100 | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Investment Based On: | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Summary | ​ | Average | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Summary | ​ | ​ | ​ | Compensation | ​ | Compensation | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fiscal | ​ | Compensation | ​ | Compensation | ​ | Table Total for | ​ | Actually Paid to | ​ | ​ | ​ | Peer | ​ | ​ | ​ | ​ | ​
Year | ​ | Table Total for | ​ | Actually Paid to | ​ | Non-PEO NEOs | ​ | Non-PEO NEOs | ​ | Company | ​ | Group TSR | ​ | Net Loss ($in | ​ | Revenue ($) | ​
(a) |  | PEO ($) (b) |  | PEO ($) (b)(c) |  | ($) (d) |  | ($) (d)(e) |  | TSR ($) (f) |  | ($) (g) |  | millions) (h) |  | (i) |
2023 | ​ | 4,811,321 | ​ | 1,442,474 | ​ | 1,421,886 | ​ | 660,598 | ​ | 55 | ​ | 71 | ​ | (108,056) | ​ | 123,394 | ​
2022 |  | 2,458,801 | ​ | (3,687,206) | ​ | 1,393,423 | ​ | 581,404 | ​ | 156 | ​ | 120 | ​ | (147,232) | ​ | 130,484 | ​
2021 |  | 3,585,248 | ​ | 11,728,338 | ​ | 1,235,462 | ​ | 2,386,582 | ​ | 400 | ​ | 164 | ​ | (101,025) | ​ | 69,585 | ​
(a) | This statement includes three fiscal years (2021, 2022, and 2023) rather than five because this is a transition year for the new regulation.
(b) | The principal executive officer (“PEO”) is Jason Few for all years shown.
(c) | Compensation actually paid (“CAP”) to our PEO reflects the respective amounts set forth in column (b) of the table above, adjusted as set forth in the table below. The assumptions used to calculate the fair values did not differ materially from the assumptions used to calculate the fair values as of the grant dates.
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fiscal Year |  | 2021 |  | 2022 |  | 2023 |
Summary Compensation Table (“SCT”) Total Compensation ($) |  | 3,585,248 | ​ | 2,458,801 | ​ | 4,811,321 | ​
Less: Stock and Option Award Values Reported in SCT for the Covered Year ($) |  | (2,641,264) | ​ | (1,306,250) | ​ | (3,732,622) | ​
Plus: Fair Value for Stock and Option Awards Granted in the Covered Year that are Outstanding and Unvested at End of Year ($) |  | 4,073,169 |  | 434,375 | ​ | 900,689 | ​
Change in Fair Value of Outstanding Unvested Stock and Option Awards from Prior Years ($) |  | 6,657,887 | ​ | (1,833,203) | ​ | (142,382) | ​
Fair Value as of Vesting Date for Awards Granted that Vested in Same Year ($) |  | — | ​ | — | ​ | — | ​
Change in Fair Value of Stock and Option Awards from Prior Years that Vested in the Covered Year ($) |  | 53,298 | ​ | (3,440,929) | ​ | (394,532) | ​
Less: Fair Value of Stock and Option Awards Forfeited during the Covered Year ($) |  | — | ​ | — | ​ | — | ​
Compensation Actually Paid ($) |  | 11,728,338 | ​ | (3,687,206) | ​ | 1,442,474 | ​
​
(d) | The following Non-PEO NEOs are included in the average figures shown: 2023: Mr. Bishop, Mr. Dolger, Mr. Lisowski and Mr. Feasel, 2022: Mr. Bishop, Mr. Dolger, Mr. Lisowski and Mr. Feasel, and 2021: Mr. Bishop, Mr. Dolger, Mr. Lisowski, Mr. Leo and Ms. Arasimowicz.
(e) | CAP to our non-PEO NEOs reflects the respective amounts set forth in column (d) of the table above, adjusted as set forth in the table below. The assumptions used to calculate the fair values did not differ materially from the assumptions used to calculate the fair values as of the grant dates.
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fiscal Year |  | 2021 |  | 2022 |  | 2023 |
Non-PEO NEOs |  | See column (d) note above |  | See column (d) note above |  | See column (d) note above | ​
Average SCT Total Compensation ($) |  | 1,235,462 |  | 1,393,423 | ​ | 1,421,886 | ​
Less: Average Stock and Option Award Values Reported in SCT for the Covered Year ($) |  | (654,102) | ​ | (697,361) | ​ | (799,382) | ​
Plus: Average Fair Value for Stock and Option Awards Granted in the Covered Year ($) |  | 939,440 | ​ | 256,623 | ​ | 187,271 | ​
Average Change in Fair Value of Outstanding Unvested Stock and Option Awards from Prior Years ($) |  | 777,820 | ​ | (336,736) | ​ | (87,520) | ​
Average Fair Value as of Vesting Date for Awards Granted that Vested in Same Year ($) |  | — | ​ | — | ​ | — | ​
Average Change in Fair Value of Stock and Option Awards from Prior Years that Vested in the Covered Year ($) |  | 87,963 | ​ | (34,544) | ​ | (61,657) | ​
Less: Average Fair Value of Stock and Option Awards Forfeited during the Covered Year ($) |  | — | ​ | — | ​ | — | ​
Average Compensation Actually Paid ($) |  | 2,386,582 | ​ | 581,404 | ​ | 660,598 | ​
​ (f) Represents our TSR calculated from October 31, 2020 for the measurement periods ending October 31 of each of 2021, 2022 and 2023, respectively. (g) Represents the peer group TSR calculated from October 31, 2020 for the measurement periods ending on October 31 of each of 2021, 2022 and 2023, respectively. The peer group used for this purpose is the following published industry index: NASDAQ Clean Edge Green Energy Total Return Index. (h) Reflects “Net Loss” in the Company’s audited financial statements included in the Company’s Annual Reports on Form 10-K for each of the years ended October 31, 2021, 2022 and 2023. (i) The Company-selected measure is “Revenue” in the Company’s audited financial statements included in the Company’s Annual Reports on Form 10-K for each of the years ended October 31, 2021, 2022 and 2023. |  |
Company Selected Measure Name | Revenue |  |
Named Executive Officers, Footnote | ​
(b) | The principal executive officer (“PEO”) is Jason Few for all years shown.
Peer Group Issuers, Footnote | (g) Represents the peer group TSR calculated from October 31, 2020 for the measurement periods ending on October 31 of each of 2021, 2022 and 2023, respectively. The peer group used for this purpose is the following published industry index: NASDAQ Clean Edge Green Energy Total Return Index. |  |
PEO Total Compensation Amount | $ 4,811,321 | $ 2,458,801 | $ 3,585,248
PEO Actually Paid Compensation Amount | $ 1,442,474 | (3,687,206) | 11,728,338
Adjustment To PEO Compensation, Footnote |
(c) | Compensation actually paid (“CAP”) to our PEO reflects the respective amounts set forth in column (b) of the table above, adjusted as set forth in the table below. The assumptions used to calculate the fair values did not differ materially from the assumptions used to calculate the fair values as of the grant dates.
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fiscal Year |  | 2021 |  | 2022 |  | 2023 |
Summary Compensation Table (“SCT”) Total Compensation ($) |  | 3,585,248 | ​ | 2,458,801 | ​ | 4,811,321 | ​
Less: Stock and Option Award Values Reported in SCT for the Covered Year ($) |  | (2,641,264) | ​ | (1,306,250) | ​ | (3,732,622) | ​
Plus: Fair Value for Stock and Option Awards Granted in the Covered Year that are Outstanding and Unvested at End of Year ($) |  | 4,073,169 |  | 434,375 | ​ | 900,689 | ​
Change in Fair Value of Outstanding Unvested Stock and Option Awards from Prior Years ($) |  | 6,657,887 | ​ | (1,833,203) | ​ | (142,382) | ​
Fair Value as of Vesting Date for Awards Granted that Vested in Same Year ($) |  | — | ​ | — | ​ | — | ​
Change in Fair Value of Stock and Option Awards from Prior Years that Vested in the Covered Year ($) |  | 53,298 | ​ | (3,440,929) | ​ | (394,532) | ​
Less: Fair Value of Stock and Option Awards Forfeited during the Covered Year ($) |  | — | ​ | — | ​ | — | ​
Compensation Actually Paid ($) |  | 11,728,338 | ​ | (3,687,206) | ​ | 1,442,474 | ​
Non-PEO NEO Average Total Compensation Amount | $ 1,421,886 | 1,393,423 | 1,235,462
Non-PEO NEO Average Compensation Actually Paid Amount | $ 660,598 | 581,404 | 2,386,582
Adjustment to Non-PEO NEO Compensation Footnote |
(d) | The following Non-PEO NEOs are included in the average figures shown: 2023: Mr. Bishop, Mr. Dolger, Mr. Lisowski and Mr. Feasel, 2022: Mr. Bishop, Mr. Dolger, Mr. Lisowski and Mr. Feasel, and 2021: Mr. Bishop, Mr. Dolger, Mr. Lisowski, Mr. Leo and Ms. Arasimowicz.
(e) | CAP to our non-PEO NEOs reflects the respective amounts set forth in column (d) of the table above, adjusted as set forth in the table below. The assumptions used to calculate the fair values did not differ materially from the assumptions used to calculate the fair values as of the grant dates.
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fiscal Year |  | 2021 |  | 2022 |  | 2023 |
Non-PEO NEOs |  | See column (d) note above |  | See column (d) note above |  | See column (d) note above | ​
Average SCT Total Compensation ($) |  | 1,235,462 |  | 1,393,423 | ​ | 1,421,886 | ​
Less: Average Stock and Option Award Values Reported in SCT for the Covered Year ($) |  | (654,102) | ​ | (697,361) | ​ | (799,382) | ​
Plus: Average Fair Value for Stock and Option Awards Granted in the Covered Year ($) |  | 939,440 | ​ | 256,623 | ​ | 187,271 | ​
Average Change in Fair Value of Outstanding Unvested Stock and Option Awards from Prior Years ($) |  | 777,820 | ​ | (336,736) | ​ | (87,520) | ​
Average Fair Value as of Vesting Date for Awards Granted that Vested in Same Year ($) |  | — | ​ | — | ​ | — | ​
Average Change in Fair Value of Stock and Option Awards from Prior Years that Vested in the Covered Year ($) |  | 87,963 | ​ | (34,544) | ​ | (61,657) | ​
Less: Average Fair Value of Stock and Option Awards Forfeited during the Covered Year ($) |  | — | ​ | — | ​ | — | ​
Average Compensation Actually Paid ($) |  | 2,386,582 | ​ | 581,404 | ​ | 660,598 | ​
Tabular List, Table | ​ As described in greater detail in the section above entitled “Compensation Discussion and Analysis,” the Company’s executive compensation program reflects a variable pay-for-performance philosophy. The metrics that the Company uses for both our long-term and short-term incentive awards are selected to incentivize our NEOs. The five operating performance measures listed below represent the most important metrics we used to link CAP to financial performance for fiscal year 2023, as further described in the section above entitled “Compensation Discussion and Analysis.” ​ ​ Most Important Performance Measures 1. Total Revenue 2. Order Bookings 3. Total Unrestricted Cash 4. Adjusted EBITDA 5. Total Reportable Injury Rate |  |
Total Shareholder Return Amount | $ 55 | 156 | 400
Peer Group Total Shareholder Return Amount | 71 | 120 | 164
Net Income (Loss) | $ (108,056,000) | $ (147,232,000) | $ (101,025,000)
Company Selected Measure Amount | 123,394,000 | 130,484,000 | 69,585,000
PEO Name | Jason Few |  |
Measure:: 1 |  |  |
Pay vs Performance Disclosure |  |  |
Name | Total Revenue |  |
Non-GAAP Measure Description | (i) The Company-selected measure is “Revenue” in the Company’s audited financial statements included in the Company’s Annual Reports on Form 10-K for each of the years ended October 31, 2021, 2022 and 2023. |  |
Measure:: 2 |  |  |
Pay vs Performance Disclosure |  |  |
Name | Order Bookings |  |
Measure:: 3 |  |  |
Pay vs Performance Disclosure |  |  |
Name | Total Unrestricted Cash |  |
Measure:: 4 |  |  |
Pay vs Performance Disclosure |  |  |
Name | Adjusted EBITDA |  |
Measure:: 5 |  |  |
Pay vs Performance Disclosure |  |  |
Name | Total Reportable Injury Rate |  |
PEO | Less: Stock and Option Award Values Reported in SCT for the Covered Year ($) |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation, Amount | $ (3,732,622) | $ (1,306,250) | $ (2,641,264)
PEO | Plus: Fair Value for Stock and Option Awards Granted in the Covered Year that are Outstanding and Unvested at End of Year ($) |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation, Amount | 900,689 | 434,375 | 4,073,169
PEO | Change in Fair Value of Outstanding Unvested Stock and Option Awards from Prior Years ($) |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation, Amount | (142,382) | (1,833,203) | 6,657,887
PEO | Change in Fair Value of Stock and Option Awards from Prior years that Vested in the Covered Year ($) |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation, Amount | (394,532) | (3,440,929) | 53,298
Non-PEO NEO | Less: Stock and Option Award Values Reported in SCT for the Covered Year ($) |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation, Amount | (799,382) | (697,361) | (654,102)
Non-PEO NEO | Plus: Fair Value for Stock and Option Awards Granted in the Covered Year that are Outstanding and Unvested at End of Year ($) |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation, Amount | 187,271 | 256,623 | 939,440
Non-PEO NEO | Change in Fair Value of Outstanding Unvested Stock and Option Awards from Prior Years ($) |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation, Amount | (87,520) | (336,736) | 777,820
Non-PEO NEO | Change in Fair Value of Stock and Option Awards from Prior years that Vested in the Covered Year ($) |  |  |
Pay vs Performance Disclosure |  |  |
Adjustment to Compensation, Amount | $ (61,657) | $ (34,544) | $ 87,963

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