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Fair Value Measurements (Narrative) (Details) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) | Sep. 30, 2015 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Purchase price in escrow |  | $ 980 | $ 980 | $ 1,960
Non-cash impairment charges | $ 8,978 |  |  |
Impairment and loss on right of use asset | $ 17,540 | 17,540 |  |
Fair Value, Nonrecurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Property, plant and equipment, net |  | $ 11,515 | $ 309 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Measurement Input, Exercise Price [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Warrants and Rights Outstanding, Measurement Input | $ / shares |  | 0.01 |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Property, plant and equipment, net |  | $ 11,515 |  |

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