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Quarterly Financial Data - Schedule of Quarterly Financial Information (Parenthetical) (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 25, 2018 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Recovery from a settlement with a vendor |  | $ 4,419 |  |  |  |  |  |  |  |  |  |
Gross profit (loss) |  | 12,411 | $ (9,742) | $ 3,073 | $ 10,093 | $ (10,204) | $ (7,285) | $ 11,340 | $ 11,615 | $ 15,835 | $ 5,466 | $ (49,306)
Net income (loss) |  | (13,045) | (26,084) | (27,506) | (5,591) | 914 | (17,112) | (7,033) | (5,986) | (72,226) | (29,217) | 112,168
Loss on extinguishment of debt |  |  | (5,951) |  |  |  |  |  |  | (5,951) |  | (8,703)
Interest expense, net | $ (900) | (11,056) | (11,009) | (11,693) | (9,306) | (9,326) | (9,291) | (9,292) | (9,358) | (43,064) | (37,267) | (30,945)
Severance benefits and accelerated stock-based compensation |  | (5,300) |  |  |  |  |  |  |  |  |  |
Provision (benefit) for income taxes |  | (764) | 2,426 | (4,324) | 922 | 30,018 | 6,698 | 2,761 | $ 1,282 | $ 1,740 | $ (40,759) | $ (41,956)
Income From Discontinued Operations Net of Taxes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  | 1,076 |  |  |  |  |  |
Turnaround Expense [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross profit (loss) |  | (116) | (7,939) | (1,412) | (302) | (102) | (1,098) | (120) |  |  |  |
Net income (loss) |  | $ (116) | $ (7,939) | $ (1,412) | $ (302) | $ (102) | $ (1,098) | (120) |  |  |  |
Recovery of Precious Metals [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Recovery of precious metals |  |  |  |  |  |  |  | $ 2,905 |  |  |  |

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