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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Nov. 30, 2012
Nov. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (9,118) $ (7,831)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 2,097 1,964
Stock-based compensation expense 336 651
Bad debt expense 686  
Provisions for inventory write-downs 712 994
Equity in losses from unconsolidated entities, net 75 1,526
Income recognized on patents assignment (13) (13)
Changes in operating assets and liabilities:    
Accounts receivable, net 262 178
Inventories 957 (2,352)
Prepaid expenses and other 101 (164)
Accounts payable 147 980
Accrued expenses and other current liabilities 508 611
Net cash used in operating activities (3,250) (3,456)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment, including interest capitalized (1,669) (5,808)
Purchase of investments (2,873)  
Payments for development of intangible assets (119) (103)
Proceeds from sale of short-term investments 488  
Proceeds from return of investment in unconsolidated entity 250  
Other investing activities, net (1) (2)
Net cash used in investing activities (3,924) (5,913)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from exercise of stock options 1 26
Payments on line of credit (1,623)  
Payments of long-term debt (244) (234)
Net cash used in financing activities (1,866) (208)
Effect of exchange rate changes on cash and cash equivalents 1,132 (88)
NET DECREASE IN CASH AND CASH EQUIVALENTS (7,908) (9,665)
CASH AND CASH EQUIVALENTS-Beginning of period 47,228 83,619
CASH AND CASH EQUIVALENTS-End of period 39,320 73,954
NONCASH INVESTING AND FINANCING ACTIVITIES:    
Accrual related to property, plant and equipment $ 1,776 $ 765