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Discontinued Operations - Summary of Financial Results for MBP Titan (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Income (loss) from discontinued operations |  | $ (66,748) | $ (153,582) | $ (134,219)
Impairment of goodwill | $ 178 | 9,635 | 87,862 | 0
MBP Titan | Discontinued Operations, Disposed of by Means Other than Sale, Abandonment |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Operating expenses |  | 40,692 | 37,423 | 33,830
Operating income (loss) |  | (40,692) | (37,423) | (33,830)
Income (loss) before income taxes |  | (40,692) | (37,423) | (33,830)
Income (loss) from discontinued operations |  | (40,692) | (37,423) | (33,830)
Impairment of goodwill |  | 9,635 | 0 | 0
Impairment of other noncurrent assets |  | $ 12,406 | $ 0 | $ 0

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