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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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