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Discontinued Operations - Non-cash Items and Purchases of Property, Plant and Equipment 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
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |
Depreciation and amortization |  | $ 17,516 | $ 24,896 | $ 33,112
Impairment of goodwill | $ 178 | 9,635 | 87,862 | 0
Stock-based compensation expense |  | 18,366 | 18,950 | 36,296
Cash flows from investing activities |  |  |  |
Purchases of property, plant and equipment |  | (7,527) | (37,883) | (41,587)
Discontinued Operations, Disposed of by Means Other than Sale, Abandonment | MBP Titan |  |  |  |
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |
Depreciation and amortization |  | 2,474 | 3,647 | 3,493
Impairment of goodwill |  | 9,635 | 0 | 0
Impairment of other noncurrent assets |  | 12,406 | 0 | 0
Stock-based compensation expense |  | (34) | 1,345 | 1,870
Cash flows from investing activities |  |  |  |
Purchases of property, plant and equipment |  | $ (88) | $ (2,114) | $ (3,558)

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