Amount of assets held-for-sale that are not part of a disposal group.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount, after accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset.

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Property and Equipment - Narratives (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 200	$ 500	$ 800	$ 2,300
Property, Plant and Equipment
Assets held for sale	545		545			$ 0
Property and equipment, net	$ 7,769		$ 7,769			$ 9,087
Adjustment
Property, Plant and Equipment
Assets held for sale					$ 500
Property and equipment, net					$ (500)