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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2018
Apr. 30, 2017
Oct. 31, 2017
Cash flows from operating activities:          
Net loss $ (13,174) $ (13,238) $ (17,357) $ (26,923)  
Adjustments to reconcile net loss to net cash used in operating activities:          
Share-based compensation     1,378 2,226  
Loss from change in fair value of embedded derivatives     45 25  
Depreciation     4,302 4,296  
Non-cash interest expense on preferred stock and debt obligations     2,845 2,958  
Unrealized foreign exchange gains     (367) (259)  
Deferred income taxes     (3,035) 0  
Project asset impairment     485 0  
Other non-cash transactions, net     203 241  
Decrease (increase) in operating assets:          
Accounts receivable     24,379 (9,020)  
Inventories     30,981 (1,779)  
Other assets     (1,382) (366)  
Increase (decrease) in operating liabilities:          
Accounts payable     3,290 (4,837)  
Accrued liabilities     (4,238) (5,684)  
Deferred revenue     386 547  
Net cash provided by (used in) operating activities     41,915 (38,575)  
Cash flows from investing activities:          
Capital expenditures     (5,506) (8,290)  
Project asset expenditures     (21,749) (10,154)  
Cash acquired from asset acquisition     0 633  
Net cash used in investing activities     (27,255) (17,811)  
Cash flows from financing activities:          
Repayment of debt     (10,919) (6,299)  
Proceeds from debt     13,091 17,891  
Payment of deferred financing costs     (352) (119)  
Payment of preferred dividends and return of capital     (2,096) (2,067)  
Cash received for common stock issued for stock plans     0 50  
Proceeds from sale of common stock and warrant exercises, net     3,268 12,785  
Net cash provided by financing activities     2,992 22,241  
Effects on cash from changes in foreign currency rates     87 (38)  
Net increase (decrease) in cash, cash equivalents and restricted cash     17,739 (34,183)  
Cash, cash equivalents and restricted cash-beginning of period     87,448 118,316 $ 118,316
Cash, cash equivalents and restricted cash-end of period $ 105,187 $ 84,133 105,187 84,133 $ 87,448
Supplemental cash flow disclosures:          
Cash interest paid     1,144 2,821  
Noncash financing and investing activity:          
Common stock issued for Employee Stock Purchase Plan in settlement of prior year accrued employee contributions     0 50  
Net noncash reclass of project assets to inventory     11,740 0  
Assumption of debt in conjunction with asset acquisition     0 2,289  
Acquisition of project assets     0 2,386  
Series C preferred share conversions     15,598 0  
Accrued purchase of fixed assets, cash paid in subsequent period     273 1,816  
Accrued purchase of project assets, cash paid in subsequent period     $ 1,504 $ 115