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Nature of Business and Basis of Presentation - Additional Information (Details) - USD ($) |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 05, 2020 | Apr. 24, 2020 | Apr. 20, 2020 | Nov. 22, 2019 | Nov. 05, 2019 | Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2020 | Apr. 30, 2019 | Oct. 31, 2020 | Oct. 31, 2019 | Jun. 08, 2020
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Research and development expenses |  |  |  |  |  | $ 1,141,000 | $ 4,178,000 | $ 2,296,000 | $ 10,458,000 |  |  |
Unrestricted cash and cash equivalents |  |  |  |  |  | 29,100,000 |  | 29,100,000 |  |  | $ 9,400,000 |
Unrestricted cash and cash equivalents balance excluding amounts funded |  |  |  |  |  | 4,500,000 |  | 4,500,000 |  |  | 9,400,000 |
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from long-term lines of credit |  |  |  |  |  |  |  | $ 18,600,000 |  |  | 0 |
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Senior Secured Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  |  |  |  |  |  | 200,000,000.0 |
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Initial Funding [Member] |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Drew down to fully repay debt outstanding |  |  |  |  |  |  |  |  |  |  | 14,500,000 |
Debt instrument term |  |  |  |  |  |  |  | 7 years |  |  |  |
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Second Funding [Member] |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Drew down to fully repay debt outstanding |  |  |  | $ 65,500,000 |  |  |  |  |  |  |  |
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Remainder of Funding [Member] |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit receivable amount |  |  |  |  |  |  |  |  |  |  | $ 120,000,000.0 |
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Remainder of Funding [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit receivable amount |  |  |  |  |  | 120,000,000.0 |  | $ 120,000,000.0 |  |  |  |
Orion Energy Partners Investment Agent, LLC Credit Facility [Member] | Fifth Orion Amendment [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | $ 35,000,000
PPP Note [Member] |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from promissory note |  | $ 6,500,000 |  |  |  |  |  |  |  |  |  |
Period of utilization of amount from promissory notes |  |  | 56 days |  |  |  |  |  |  |  |  |
Percentage of payroll to be utilized from proceeds |  |  | 75.00% |  |  |  |  |  |  |  |  |
Loan forgiveness period |  |  | 56 days |  |  |  |  |  |  |  |  |
Debt instrument term |  |  | 2 years |  |  |  |  |  |  |  |  |
Promissory note balance |  |  |  |  |  | $ 6,000,000.0 |  | $ 6,000,000.0 |  |  |  |
PPP Note [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of payroll to be utilized from proceeds |  |  | 75.00% |  |  |  |  |  |  |  |  |
PPP Note [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of payroll to be utilized from proceeds | 60.00% |  |  |  |  |  |  |  |  |  |  |
Loan forgiveness period | 168 days |  |  |  |  |  |  |  |  |  |  |
Debt instrument term | 5 years |  |  |  |  |  |  |  |  |  |  |
Joint Development Agreement [Member] | Exxon Mobile Research And Engineering Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payment for exclusivity and technology access fee |  |  |  |  | $ 5,000,000.0 |  |  |  |  |  |  |
Joint Development Agreement [Member] | Maximum [Member] | Exxon Mobile Research And Engineering Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Research and development expenses |  |  |  |  | 45,000,000.0 |  |  |  |  |  |  |
Milestone-based payments |  |  |  |  | $ 10,000,000.0 |  |  |  |  |  |  |
Joint Development Agreement [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Milestone payments eligible for achievement |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |

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