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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities    
Net loss $ (38,379) $ (17,163)
Adjustments to reconcile net loss to net cash flows used in operating activities:    
Restructuring and impairment charges 6,650 880
Depreciation and amortization 1,197 3,013
Non-cash lease expense on right-of-use assets 440 990
Recognition of deferred income from state and local incentives (555) (555)
Loss on change in fair market value for warrant liability 22,128  
Stock-based compensation recognized 2,662 227
Non-cash interest expense 982  
Other non-cash items, net (36) 1,868
Changes in operating assets and liabilities, net of acquisitions:    
Accounts receivable 3,204 1,265
VAT receivable (8,754) 8
Inventories 3,419 (17,809)
Other assets (5,133) (1,273)
Accounts and contractual payables 320 6,953
Accrued payroll and employee benefits (1,166) (654)
Income taxes receivable/payable (134) (8)
Accrued warranty (1,208) (312)
Lease liability (577) (1,686)
Other liabilities (7,114) 18,443
Accrued pension costs and accrued postretirement benefits (222) (214)
Net cash flows used in operating activities (22,276) (6,027)
Cash flows from investing activities    
Maturity of restricted certificates of deposit   3,769
Purchase of property, plant and equipment (542) (3,670)
Proceeds from sale of property, plant and equipment and railcars available for lease 373 164
Net cash flows (used in) provided by investing activities (169) 263
Cash flows from financing activities    
Borrowings on revolving line of credit 165  
Repayments on revolving line of credit (165)  
Employee stock settlement (7) (9)
Payment for stock appreciation rights exercised 39  
Net cash flows used in financing activities (46) (9)
Net decrease in cash and cash equivalents (22,491) (5,773)
Cash, cash equivalents and restricted cash equivalents at beginning of period 54,047 66,257
Cash, cash equivalents and restricted cash equivalents at end of period 31,556 60,484
Supplemental cash flow information    
Interest paid 1,180 143
Income tax refunds received, net of payments 5  
Non-cash transactions    
Change in unpaid construction in process 114 $ 419
Accrued PIK interest paid through issuance of PIK Note $ 256