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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Oct. 31, 2017
Cash flows from operating activities:      
Net loss $ (4,183) $ (13,685)  
Adjustments to reconcile net loss to net cash used in operating activities:      
Share-based compensation 617 1,013  
Loss from change in fair value of embedded derivatives 55 42  
Depreciation 2,128 2,057  
Non-cash interest expense on preferred stock and debt obligations 1,491 1,470  
Unrealized foreign exchange losses 534 340  
Deferred income taxes (3,035) 0  
Other non-cash transactions, net 0 127  
Decrease (increase) in operating assets:      
Accounts receivable 26,624 (2,575)  
Inventories 14,784 (8,462)  
Other assets (1,108) 1,261  
(Decrease) increase in operating liabilities:      
Accounts payable (2,898) (5,060)  
Accrued liabilities 3,074 (2,150)  
Deferred revenue 1,914 775  
Net cash provided by (used in) operating activities 39,997 (24,847)  
Cash flows from investing activities:      
Capital expenditures (2,816) (6,377)  
Project asset expenditures (4,577) (3,053)  
Cash acquired from asset acquisition 0 633  
Net cash used in investing activities (7,393) (8,797)  
Cash flows from financing activities:      
Repayment of debt (6,253) (5,071)  
Proceeds from debt 0 17,891  
Payment of deferred financing costs 0 (119)  
Payment of preferred dividends and return of capital (1,048) (1,033)  
Cash received for common stock issued for stock plans 0 49  
Proceeds from sale of common stock, prefunded warrants and warrant exercises, net 2,647 4,977  
Net cash (used in) provided by financing activities (4,654) 16,694  
Effects on cash from changes in foreign currency rates 33 (70)  
Net increase (decrease) in cash, cash equivalents and restricted cash 27,983 (17,020)  
Cash, cash equivalents and restricted cash-beginning of period 87,448 118,316 $ 118,316
Cash, cash equivalents and restricted cash-end of period 115,431 101,296 $ 87,448
Supplemental cash flow disclosures:      
Cash interest paid 651 756  
Noncash financing and investing activity:      
Common stock issued for Employee Stock Purchase Plan in settlement of prior year accrued employee contributions 0 50  
Accrued sale of common stock, cash received in a subsequent period 0 159  
Assumption of debt in conjunction with asset acquisition 0 2,289  
Acquisition of project assets 0 2,386  
Series C preferred share conversions 7,569 0  
Accrued purchase of fixed assets, cash paid in subsequent period 1,231 1,101  
Accrued purchase of project assets, cash paid in subsequent period $ 1,750 $ 741