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Fair Value Measurements (Fair Value, Assets Measured on Recurring Basis and Non-Recurring Basis) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 7,662 $ 7,993
Restricted certificates of deposit 182 182
Warrant liability 34,858 12,730
Fair Value, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets held for sale   10,383
Right of use asset   28,960
Property, plant and equipment, net   11,515
Railcars available for lease, net   13,175
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 7,662 7,993
Restricted certificates of deposit 182 182
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warrant liability $ 34,858 12,730
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets held for sale   10,383
Right of use asset   28,960
Property, plant and equipment, net   11,515
Railcars available for lease, net   $ 13,175