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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities    
Net loss $ (17,163) $ (14,032)
Adjustments to reconcile net loss to net cash flows used in operating activities:    
Non-cash restructuring and impairment charges 312  
Depreciation and amortization 3,013 3,206
Amortization expense - right-of-use leased assets 990 3,202
Recognition of deferred income from state and local incentives (555) (554)
Stock-based compensation recognized 227 689
Other non-cash items, net 1,868 (736)
Changes in operating assets and liabilities, net of acquisitions:    
Accounts receivable 1,273 8,928
Inventories (17,809) 12,591
Other assets (1,273) (2,355)
Accounts and contractual payables 7,521 (4,516)
Accrued payroll and employee benefits (654) 359
Income taxes receivable/payable (8) (200)
Accrued warranty (312) 1,736
Lease liability (1,686) (5,037)
Customer deposits 17,392 (1,719)
Other liabilities 1,051 259
Accrued pension costs and accrued postretirement benefits (214) (114)
Net cash flows (used in) provided by operating activities (6,027) 1,707
Cash flows from investing activities    
Purchase of restricted certificates of deposit   (1,117)
Maturity of restricted certificates of deposit 3,769 4,400
Purchase of securities held to maturity   (1,986)
Proceeds from maturity of securities   18,025
Purchase of property, plant and equipment (3,670) (760)
Proceeds from sale of property, plant and equipment and railcars available for lease 164  
Net cash flows provided by investing activities 263 18,562
Cash flows from financing activities    
Employee stock settlement (9) (59)
Deferred financing costs   (280)
Net cash flows used in financing activities (9) (339)
Net increase (decrease) in cash and cash equivalents (5,773) 19,930
Cash, cash equivalents and restricted cash equivalents at beginning of period 66,257 45,070
Cash, cash equivalents and restricted cash equivalents at end of period 60,484 65,000
Supplemental cash flow information    
Interest paid 143 15
Income tax refunds received
Income tax paid