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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Cash flows from operating activities:    
Net loss $ (17,548) $ (4,183)
Adjustments to reconcile net loss to net cash used in operating activities:    
Share-based compensation 982 617
Loss from change in fair value of embedded derivatives 22 55
Depreciation 2,199 2,128
Non-cash interest expense on preferred stock and debt obligations 1,574 1,491
Unrealized foreign exchange (gains) losses (12) 534
Deferred income taxes 0 (3,035)
Other non-cash transactions, net 187 0
Decrease (increase) in operating assets:    
Accounts receivable 1,329 26,280
Unbilled receivables (7,828) 344
Inventories (1,227) 14,784
Other assets 139 (1,108)
Increase (decrease) in operating liabilities:    
Accounts payable (152) (2,898)
Accrued liabilities 2,532 3,074
Deferred revenue 5,845 1,914
Net cash (used in) provided by operating activities (11,958) 39,997
Cash flows from investing activities:    
Capital expenditures (1,591) (2,816)
Project asset expenditures (12,633) (4,577)
Net cash used in investing activities (14,224) (7,393)
Cash flows from financing activities:    
Repayment of debt (1,610) (6,253)
Proceeds from debt 17,250 0
Payment of deferred financing costs (485) 0
Payment of preferred dividends and return of capital (1,036) (1,048)
Common stock issued for stock plans and related expenses 31 0
Proceeds from sale of common stock and warrant exercises, net 0 2,647
Net cash provided by (used in) financing activities 14,150 (4,654)
Effects on cash from changes in foreign currency rates 7 33
Net (decrease) increase in cash, cash equivalents and restricted cash (12,025) 27,983
Cash, cash equivalents and restricted cash-beginning of period 80,239 87,448
Cash, cash equivalents and restricted cash-end of period 68,214 115,431
Supplemental cash flow disclosures:    
Cash interest paid 827 651
Noncash financing and investing activity:    
Accrued purchase of fixed assets, cash paid in subsequent period 107 1,231
Accrued purchase of project assets, cash paid in subsequent period 2,050 1,750
Series C Preferred Stock [Member]    
Noncash financing and investing activity:    
Series C preferred share conversions 1,974 7,569
Series D Preferred Stock [Member]    
Noncash financing and investing activity:    
Series C preferred share conversions $ 4,334 $ 0