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Discontinued Operations - Non-cash Items and Purchases of Property, Plant and Equipment for MBP Titan (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | $ 10,442 | $ 13,701
Impairment of goodwill | 0 | 9,635
Impairment of other noncurrent assets | 543 | 13,326
(Gain) loss on disposals of assets, net | 89 | 1,606
Stock-based compensation expense | 11,462 | 13,869
Cash flows from investing activities |  |
Purchases of property, plant and equipment | (4,474) | (6,058)
Proceeds from sale of assets | 2,537 | 1,831
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 | 0 | 2,337
Impairment of goodwill | 0 | 9,635
Impairment of other noncurrent assets | 0 | 12,406
(Gain) loss on disposals of assets, net | (464) | 13
Stock-based compensation expense | 0 | (34)
Gain on lease termination | (4,602) | 0
Cash flows from investing activities |  |
Purchases of property, plant and equipment | 0 | (88)
Proceeds from sale of assets | $ 1,083 | $ 0

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