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Discontinued Operations - Carrying Value of Major Classes of Assets and Liabilities for MBP Titan (Details) - Discontinued Operations, Disposed of by Means Other than Sale, Abandonment - MBP Titan - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Property, plant and equipment, net | $ 0 | $ 586
Right-of-use assets | 0 | 9,131
Other assets | 0 | 136
Total assets held for sale or abandonment | 0 | 9,853
Liabilities |  |
Lease liabilities, current | 0 | 1,890
Other current liabilities | 0 | 619
Lease liabilities, net of current portion | 0 | 11,538
Total liabilities held for sale or abandonment | $ 0 | $ 14,047

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