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Quarterly Financial Data - Schedule of Quarterly Financial Information (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit (loss) | $ 78,464 | $ 17,447 | $ 35,008 | $ 8,060 | $ (3,465) | $ (1,059) | $ 19,021 | $ 2,551 | $ 138,979 | $ 17,048 | $ 4,985
Gain (loss) on natural gas forward contracts |  |  |  | 2,706 | (1,443) | 513 | 31 | (714) | 2,706 | (1,613) |
Recovery from a settlement with a vendor |  |  |  |  |  |  | 5,664 |  |  |  |
Legal fees associated with Leidos matter | (296) | (271) | (441) | (886) | (572) | (901) | (955) | (3,287) |  |  |
Gain (loss) on extinguishment of debt | (20,259) |  | 10,000 |  |  |  |  |  | (10,259) |  |
Interest expense associated with Global judgment | (80) | (80) | (79) | (78) | (80) | (80) | (79) | (1,327) | (49,378) | (51,115) | (46,389)
Unrealized gain (loss) on fair value of embedded derivative |  | (1,106) | (716) | (436) | (561) | (141) | 120 | 637 |  |  |
Benefit (provision) for income taxes | 4,369 | (19) | 248 | (42) | 1,741 | 1,370 | 1,299 | $ 339 | $ 4,556 | $ 4,749 | $ 20,924
Cost of Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Compensation expense due to CoC event |  | (1,221) |  |  |  |  |  |  |  |  |
SG&A [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Compensation expense due to CoC event |  | (3,786) |  |  |  |  |  |  |  |  |
Turnaround Expense |  |  |  |  |  |  |  |  |  |  |
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit (loss) | $ (1,130) | $ (7,976) | $ (707) | $ (140) | $ (31) | $ (34) | $ (11) |  |  |  |

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