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Other Liabilities, Long-term - Narrative (Detail) - USD ($) $ in Millions | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2021 | Dec. 31, 2020 | Nov. 30, 2016
Other Liabilities [Line Items] |  |  |  |
Other long-term debt |  |  |  | $ 5.0
Prepayment agreement |  |  |  |
Other Liabilities [Line Items] |  |  |  |
Other long-term debt | $ 5.0 | $ 2.5 | $ 2.5 |
Percentage of prepayment applied against future purchases | 100.00% |  |  |
Period of customer capacity reservation | 10 years |  |  |
Prepayment agreement | Installment 1 |  |  |  |
Other Liabilities [Line Items] |  |  |  |
Debt instrument, periodic payment | $ 2.5 |  |  |
Prepayment agreement | Installment 2 |  |  |  |
Other Liabilities [Line Items] |  |  |  |
Debt instrument, periodic payment | $ 2.5 |  |  |
Period of payment of prepayment agreement | 30 days |  |  |

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