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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Cash flows from operating activities          
Net loss $ (6,172) $ (11,614) $ (14,912) $ (11,424)  
Adjustments to reconcile net loss to net cash flows (used in) provided by operating activities:          
Net proceeds from Shoals transaction     2,655    
Depreciation and amortization     8,341 7,021  
Recognition of deferred income from state and local incentives     (1,665) (1,664)  
Gain on sale of facility (573)   (573)    
Deferred income taxes     (4,840) (7,489)  
Stock-based compensation recognized     2,511 566  
Other non-cash items, net     313 610  
Changes in operating assets and liabilities, net of acquisitions:          
Accounts receivable     (31,305) 6,699  
Inventories     (14,465) 27,074  
Inventory on lease     (32,228)    
Other assets     406 1,795  
Accounts and contractual payables     18,159 (2,424)  
Accrued payroll and employee benefits     (449) (955)  
Income taxes receivable/payable     814 12,566  
Accrued warranty     1,464 (444)  
Other liabilities     (604) (727)  
Accrued pension costs and accrued postretirement benefits     (1,003) (288)  
Net cash flows (used in) provided by operating activities     (67,381) 30,916  
Cash flows from investing activities          
Purchase of restricted certificates of deposit     (4,952) (6,106)  
Maturity of restricted certificates of deposit     5,220 2,636  
Purchase of securities held to maturity     (101,356) (63,895)  
Proceeds from maturity of securities     117,442 13,000  
Cost of railcars available for lease     (5,119)    
Purchase of property, plant and equipment     (1,107) (613)  
Proceeds from sale of property, plant and equipment and railcars available for lease     2,458 119  
State and local incentives received       1,410 $ 1,410
Net cash flows provided by (used in) investing activities     12,586 (53,449)  
Cash flows from financing activities          
Employee stock settlement     (117) (19)  
Cash dividends paid to stockholders       (3,351)  
Net cash flows used in financing activities     (117) (3,370)  
Net decrease in cash and cash equivalents     (54,912) (25,903)  
Cash, cash equivalents and restricted cash equivalents at beginning of period     87,788 96,110 96,110
Cash, cash equivalents and restricted cash equivalents at end of period $ 32,876 $ 70,207 32,876 70,207 $ 87,788
Supplemental cash flow information          
Interest paid     51 55  
Income tax refunds received     552 11,929  
Income taxes paid     $ 5 $ 100