Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Cash flows from operating activities:
Net loss	$ (43,924)	$ (38,260)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation	3,432	2,530
Loss (gain) from change in fair value of embedded derivatives	94	(16)
Depreciation	6,502	3,583
Interest expense on preferred stock and debt obligations	4,607	2,193
Unrealized foreign exchange losses	1,052	41
Other non-cash transactions, net	165	303
(Increase) decrease in operating assets:
Accounts receivable	(9,296)	26,590
Inventories	(5,460)	(12,450)
Project assets	0	(15,459)
Other assets	85	108
(Decrease) increase in operating liabilities:
Accounts payable	(8,147)	(196)
Accrued liabilities	(7,547)	(145)
Deferred revenue	616	(15,333)
Net cash used in operating activities	(57,821)	(46,511)
Cash flows from investing activities:
Capital expenditures	(10,469)	(3,962)
Project asset expenditures	(12,796)	(6,505)
Cash acquired from asset acquisition	633	0
Net cash used in investing activities	(22,632)	(10,467)
Cash flows from financing activities:
Repayment of debt	(7,467)	(9,549)
Proceeds from debt	17,891	44,781
Payment of deferred financing costs	(119)	(994)
Payment of preferred dividends and return of capital	(3,102)	(3,125)
Cash received for common stock issued for stock plans	86	177
Proceeds from sale of common stock, prefunded warrants and warrant exercises, net	28,455	68,785
Net cash provided by financing activities	35,744	100,075
Effects on cash from changes in foreign currency rates	161	(26)
Net (decrease) increase in cash, cash equivalents and restricted cash	(44,548)	43,071
Cash, cash equivalents and restricted cash-beginning of period	118,316	85,740
Cash, cash equivalents and restricted cash-end of period	73,768	128,811
Supplemental cash flow disclosures:
Cash interest paid	2,022	1,295
Noncash financing and investing activity:
Common stock issued for Employee Stock Purchase Plan in settlement of prior year accrued employee contributions	50	105
Noncash reclass of inventory to project assets	7,282	0
Assumption of debt in conjunction with asset acquisition	2,289	0
Acquisition of project assets	2,386	0
Accrued purchase of fixed assets, cash paid in subsequent period	1,581	453
Accrued purchase of project assets, cash paid in subsequent period	$ 2,597	$ 0