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Stockholders' Equity and Warrant Liabilities - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 4 Months Ended | 5 Months Ended | 6 Months Ended | 11 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 01, 2022 | Jul. 12, 2022 | May 01, 2022 | Jun. 11, 2021 | Dec. 07, 2020 | Dec. 04, 2020 | Jun. 16, 2020 | Jan. 08, 2020 | Nov. 22, 2019 | Oct. 31, 2019 | Oct. 04, 2019 | May 03, 2017 | Jul. 31, 2022 | Oct. 31, 2020 | Oct. 31, 2022 | Jan. 31, 2021 | Jan. 31, 2020 | Oct. 31, 2022 | Oct. 31, 2020 | Apr. 30, 2021 | Apr. 30, 2022 | Oct. 31, 2022 | Oct. 31, 2021 | Oct. 31, 2020 | Oct. 31, 2019 | Jun. 10, 2021 | Apr. 08, 2021 | Apr. 07, 2021 | May 11, 2020 | May 10, 2020 | May 08, 2020
Stockholders' Equity Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of incremental common stock shares approved |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 162,500,000 |  |  |  | 112,500,000
Common Stock Shares Authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000,000 |  |  | 500,000,000 |  |  |  | 500,000,000 | 500,000,000 |  |  |  | 500,000,000.0 | 337,500,000 | 337,500,000 | 225,000,000.0 |
Sale of stock, price per share |  |  |  |  |  | $ 7.95 |  | $ 2.29 |  |  |  |  |  | $ 2.00 |  |  | $ 1.59 |  | $ 2.00 |  |  |  |  | $ 2.00 |  |  |  |  |  |  |
Stock issued during period shares new issues |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrants or rights purchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,396,320 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrants or rights exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected volatility |  |  |  |  | 117.02% |  |  | 103.70% |  |  |  |  |  |  |  |  | 104.90% |  |  |  |  |  |  | 114.15% |  |  |  |  |  |  |
Risk-free interest rate |  |  |  |  | 0.70% |  |  | 1.81% |  |  |  |  |  |  |  |  | 1.45% |  |  |  |  |  |  | 0.64% |  |  |  |  |  |  |
Class of warrants or rights charge |  |  |  |  |  |  |  | $ 23.7 |  |  |  |  |  |  |  | $ 16.0 | $ 10.5 |  |  |  |  |  |  | $ 0.2 |  |  |  |  |  |  |
Reclassification of estimated fair value of warrant liability to additional paid in capital |  |  |  |  | $ 21.2 |  |  |  |  |  |  |  |  |  |  |  | $ 26.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 405,562,988 |  |  | 405,562,988 |  |  |  | 405,562,988 | 366,618,693 |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period shares new issues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,396,904 | 69,074,573 | 86,307,932 |  |  |  |  |  |  |
Common Stock | Series C Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period shares new issues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,026 | 0 |  |  |  |  |  |  |
Net proceeds from common stock and warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.3 |  |  |  |  |  |  |  |
Second Funding Warrants | Warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of warrants vesting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Orion Energy Partners Investment Agent, LLC Credit Facility | Exercise Price 0.242 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants or rights |  |  |  |  | $ 0.242 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrants or rights purchase |  |  |  |  | 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrants or rights issued value |  |  |  |  | $ 0.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Orion Credit Agreement | Initial Funding Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrants or rights issued |  |  |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants or rights |  |  |  |  |  |  |  |  |  | $ 0.310 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.310 |  |  |  |  |  |
Orion Credit Agreement | Second Funding Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrants or rights issued |  |  |  |  |  |  |  |  | 14,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Orion Credit Agreement | Second Funding Warrants | Exercise Price 0.242 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrants or rights issued |  |  |  |  |  |  |  |  | 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants or rights |  |  |  |  |  |  |  |  | $ 0.242 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Orion Credit Agreement | Second Funding Warrants | Exercise Price 0.620 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrants or rights issued |  |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants or rights |  |  |  |  |  |  |  |  | $ 0.620 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2022 Open Market Sale Agreement | Jefferies LLC, B. Riley Securities, Inc., Barclays Capital Inc., BMO Capital Markets Corp., BofA Securities, Inc., Canacord Genuity LLC, Citigroup Global Markets Inc., J.P. Morgan Securities LLC and Loop Capital Markets LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of sales commission |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2022 Open Market Sale Agreement | Jefferies LLC, B. Riley Securities, Inc., Barclays Capital Inc., BMO Capital Markets Corp., BofA Securities, Inc., Canacord Genuity LLC, Citigroup Global Markets Inc., J.P. Morgan Securities LLC and Loop Capital Markets LLC | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period shares new issues | 10,700,000 |  |  |  |  |  |  |  |  |  |  |  | 18,500,000 |  |  |  |  | 18,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock | $ 39.2 |  |  |  |  |  |  |  |  |  |  |  | $ 67.2 |  |  |  |  | $ 67.2 |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of common stock | 38.4 |  |  |  |  |  |  |  |  |  |  |  | 65.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of commissions | $ 0.8 |  |  |  |  |  |  |  |  |  |  |  | $ 1.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average sale price per share |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.63 |  |  |  |  | $ 3.63 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares remaining under the plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 76,500,000 |  |  | 76,500,000 |  |  |  | 76,500,000 |  |  |  |  |  |  |  |  |
2022 Open Market Sale Agreement | Maximum | Jefferies LLC, B. Riley Securities, Inc., Barclays Capital Inc., BMO Capital Markets Corp., BofA Securities, Inc., Canacord Genuity LLC, Citigroup Global Markets Inc., J.P. Morgan Securities LLC and Loop Capital Markets LLC | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period shares new issues |  | 95,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Open Market Sale Agreement | Jefferies LLC and Barclays Capital Inc. | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period shares new issues |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 64,000,000.0 | 19,900,000 |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 498.1 | $ 120.8 |  |  |  |  |  |  |  |  |
Net proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 488.1 | 2.4 |  |  |  |  |  |  |  |  |
Payments of commissions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10.0 | $ 118.3 |  |  |  |  |  |  |  |  |
Aggregate offering price |  |  |  | $ 500.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of sales commission |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average sale price per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.79 | $ 6.07 |  |  |  |  |  |  |  |  |
2020 Open Market Sale Agreement | Jefferies LLC | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period shares new issues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28,300,000 | 0 |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 70.1 |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 72.3 |  |  |  |  |  |  |  |  |  |  |  |
Payments of commissions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.2 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of sales commission |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average sale price per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.55 |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares reserved for issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
2020 Open Market Sale Agreement | Maximum | Jefferies LLC | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate offering price |  |  |  |  |  |  | $ 75.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 At Market Issuance Sales Agreement | B Riley FBR, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of sales commission |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares reserved for issuance |  |  |  |  |  |  |  |  |  |  | 27,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve for issuance of common stock upon exercise of warrants shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000.0 |  |  |  |  |  |
2019 At Market Issuance Sales Agreement | B Riley FBR, Inc. | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period shares new issues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,900,000 |  |  |  |  |  |  |
Net proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.6 |  |  |  |  |  |  |
Payments of commissions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.1 |  |  |  |  |  |  |
Average sale price per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.46 |  |  |  |  |  |  |
Net proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.5 |  |  |  |  |  |  |
2019 At Market Issuance Sales Agreement | Maximum | B Riley FBR, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period shares new issues |  |  |  |  |  |  |  |  |  |  | 38,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares reserved for issuance |  |  |  |  |  |  |  |  |  | 7,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,900,000 |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  |  |  |  |  | 18,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,000,000.0 |  |  |  |  |  |
Underwriting Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued to underwriters |  |  |  |  |  | 19,822,219 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction |  |  |  |  |  | 14,696,320 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, price per share |  |  |  |  |  | $ 6.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period shares new issues |  |  |  |  |  | 25,000,000 |  |  |  |  |  |  |  | 50,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriting discounts and commissions |  |  |  |  |  | $ 0.2275 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of common stock |  |  |  |  |  | $ 162.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of common stock |  |  |  |  |  | $ 156.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance Initial Public Offering |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 105.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of public offering. |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 98.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriting Agreement | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option to purchase additional common stock shares |  |  |  |  |  | 5,177,781 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriting Public offering | Series C Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrants or rights issued |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right term |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued, price per share |  |  |  |  |  |  |  |  |  |  |  | $ 19.20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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