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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
May 31, 2012
May 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (25,247) $ (2,471)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 6,320 4,759
Stock-based compensation expense 2,114 1,388
Bad debt expense   50
Gain on disposal of property, plant and equipment (125)  
Provisions for inventory write-downs 2,333 1,519
Equity in losses from unconsolidated entities, net 4,875 2,002
Income recognized on patents assignment (38) (4)
Changes in operating assets and liabilities:    
Accounts receivable, net 215 617
Inventories (1,434) (7,091)
Prepaid expenses and other (66) (601)
Accounts payable 692 (510)
Accrued expenses and other current liabilities (176) 317
Net cash used in operating activities (10,537) (25)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment, including interest capitalized (10,351) (16,490)
Sale of property, plant and equipment 171  
Purchase of investments   (993)
Payments for development of intangible assets (259) (171)
Proceeds from patents assignment, net   540
Other investing activities, net 17 (98)
Net cash used in investing activities (10,422) (17,212)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock, net of issuance costs   92,702
Proceeds from exercise of stock options 68 62
Proceeds from line of credit 1,594 3,304
Payments on line of credit (900) (1,425)
Proceeds from long-term debt   2,896
Payments of long-term debt (710) (642)
Net cash provided by financing activities 52 96,897
Effect of exchange rate changes on cash and cash equivalents 233 1,212
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (20,674) 80,872
CASH AND CASH EQUIVALENTS-Beginning of period 83,619 13,520
CASH AND CASH EQUIVALENTS-End of period 62,945 94,392
NONCASH INVESTING AND FINANCING ACTIVITIES:    
Accrual related to property, plant and equipment $ 2,124 $ 560