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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Cash flows from operating activities:    
Net loss $ (13,685) $ (11,779)
Adjustments to reconcile net loss to net cash used in operating activities:    
Share-based compensation 1,013 858
Loss (gain) from change in fair value of embedded derivatives 42 (84)
Depreciation 2,057 1,151
Interest expense on preferred stock and debt obligations 1,470 430
Unrealized foreign exchange losses (gains) 340 (845)
Other non-cash transactions, net 127 203
(Increase) decrease in operating assets:    
Accounts receivable (2,575) 16,493
Inventories (8,462) 5,478
Project assets 0 (8,939)
Other assets 1,261 120
(Decrease) increase in operating liabilities:    
Accounts payable (5,060) (1,141)
Accrued liabilities (2,150) 9,972
Deferred revenue 775 (3,321)
Net cash used in (provided by) operating activities (24,847) 8,596
Cash flows from investing activities:    
Capital expenditures (6,377) (1,314)
Project asset expenditures (3,053) (2,044)
Cash Acquired from Acquisition 633 0
Net cash used in investing activities (8,797) (3,358)
Cash flows from financing activities:    
Repayment of debt (5,071) (8,916)
Proceeds from debt 17,891 20,102
Payment of deferred finance costs (119) 0
Payment of preferred dividends and return of capital (1,033) (1,033)
Cash received for common stock issued for stock plans 49 0
Proceeds from sale of common stock, warrants adn pre-funded warrants, net 4,977 13,306
Net cash provided by financing activities 16,694 23,459
Effects on cash from changes in foreign currency rates (70) (218)
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect (17,020) 28,479
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents-beginning of period 118,316 85,740
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents-end of period 101,296 114,219
Supplemental cash flow disclosures:    
Cash interest paid 756 359
Noncash financing and investing activity:    
Common stock issued for Employee Stock Purchase Plan in settlement of prior year accrued employee contributions 50 105
noncash acquisition project assets 2,386 0
Accrued purchase of fixed assets 1,101 0
Noncash or Part Noncash Acquisition, Debt Assumed 2,289 0
Accrued purchase of project assets 741 0
Accrued grant awards 0 1,099
Accrued Sale of Common Stock $ 159 $ 475