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Commitments and Contingencies - Settlement Agreement (Details) |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 20, 2021 USD ($) item | Apr. 30, 2022 USD ($) item | Apr. 30, 2022 KRW (₩) item | Dec. 23, 2021 USD ($) | Oct. 31, 2021 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |  |
Amount of contractual Obligation |  | $ 2,400,000 |  |  | $ 2,200,000
POSCO Energy Settlement Agreement |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Contingent liability | $ 1,800,000 |  |  |  |
Period within which an application should be filed | 5 days |  |  |  |
Warrant period against module defect from the date of shipment. | 18 months |  |  |  |
Warrant period against module defect from the date of installation | 12 months |  |  |  |
Period for reimbursement due to shortfall or defect | 7 years |  |  |  |
Percentage of maximum annual reimbursement obligation | 7.50% |  |  |  |
Number of firm, non-cancelable orders | item | 12 |  |  |  |
Number of weeks within which the orders to be placed | item | 2 |  |  |  |
Price per module of the orders to be placed | $ 3,000,000.0 |  |  |  |
Number of modules delivered | item | 6 |  |  |  |
Period of right of first refusal on operation and maintenance services | 24 months |  |  |  |
Number of balance of plant units | item |  | 8 | 8 |  |
Purchase price per unit of balance of plant units |  | $ 2,116,500 | ₩ 2,550,000,000 |  |
Amount of contractual Obligation |  | 24,000,000 |  | $ 24,000,000.0 |
Amount of contractual obligation to be paid on fiscal year |  |  |  | 19,000,000.0 |
Payments for contractual obligation |  | $ 19,000,000 |  |  |
POSCO Energy Settlement Agreement | Settlement agreement orders on or before June 30, 2022 |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Number of additional firm, non-cancelable orders to be placed | item | 8 |  |  |  |
Amount of contractual obligation to be paid in next six months |  |  |  | $ 5,000,000.0 |
POSCO Energy Settlement Agreement | Settlement agreement orders on or before December 31, 2022 |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Number of additional firm, non-cancelable orders to be placed | item | 14 |  |  |  |
Price per module of the orders to be placed | $ 3,000,000.0 |  |  |  |

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