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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Cash flows from operating activities:    
Net loss $ (14,377) $ (31,015)
Adjustments to reconcile net loss to net cash used in operating activities:    
Share-based compensation 843 1,608
Loss from equity investment 512 55
Accretion of redeemable preferred stock of subsidiary 0 525
Depreciation 2,853 3,185
Amortization of bond premium and interest expense on Series 1 Preferred 1,065 42
Other non-cash transactions (4) 227
Decrease (increase) in operating assets:    
Accounts receivable 4,926 (2,048)
Inventories (12,585) (2,795)
Other assets 1,066 (5,260)
Increase (decrease) in operating liabilities:    
Accounts payable (1,547) 1,197
Accrued liabilities (2,671) 10,268
Deferred revenue (10,172) 5,177
Net cash used in operating activities (30,091) (18,834)
Cash flows from investing activities:    
Capital expenditures (1,681) (700)
Treasury notes matured 12,000 49,000
Treasury notes purchased 0 (33,019)
Net cash provided by investing activities 10,319 15,281
Cash flows from financing activities:    
Repayment of debt (107) (65)
Proceeds from debt 0 3,000
Payment of preferred dividends and return of capital (5,275) (4,406)
Proceeds from sale of common stock, net of registration fees 34,003 21,533
Net cash provided by financing activities 28,621 20,062
Effects on cash from changes in foreign currency rates (2) 4
Net increase in cash and cash equivalents 8,847 16,513
Cash and cash equivalents-beginning of period 51,415 20,467
Cash and cash equivalents-end of period 60,262 36,980
Supplemental cash flow disclosures:    
Cash interest paid 156 66
Noncash financing and investing activity:    
Common stock issued in settlement of prior year bonus obligation 550 707
Common stock issued for Employee Stock Purchase Plan in settlement of prior year accrued employee contributions 84 58
Accrued sale of common stock, cash received in subsequent period 30,000 0
Adjustment for modification of redeemable preferred stock of subsidiary $ 0 $ 8,987