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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income (loss) $ (49,949) $ (16,138) $ 10,828
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Depreciation and amortization 8,677 6,663 4,695
Impairment of long-lived assets 7,507    
Stock-based compensation expense 2,616 1,785 247
Bad debt expense 1,405 1,196 100
Provisions for inventory write-downs 3,148 5,793 40
Gain on disposal of property, plant and equipment (125)   (15)
Equity in losses from unconsolidated entities, net 13,619 3,126 313
Bargain purchase gain on acquisition     (349)
Income recognized on patents assignment (51) (17)  
Changes in operating assets and liabilities:      
Accounts receivable, net (773) 1,992 (4,872)
Inventories (445) (8,132) (3,463)
Prepaid expenses and other 369 (854) (1,810)
Accounts payable 421 (595) 1,501
Accrued expenses and other current liabilities (2,190) 3,131 1,307
Net cash provided by (used in) operating activities (15,771) (2,050) 8,522
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of property, plant and equipment, including interest capitalized (11,569) (21,462) (9,807)
Sale of property, plant and equipment 218   54
Purchase of investments   (993) (15,530)
Purchase of short-term investments (8,831)    
Payments for development of intangible assets (368) (270) (235)
Acquisition, net of cash acquired   (1,330) (922)
Proceeds from patents assignment, net   540  
Other investing activities, net 17 (125) 50
Net cash used in investing activities (20,533) (23,640) (26,390)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds from issuance of common stock, net of issuance costs   92,702  
Proceeds from issuance of Series E convertible preferred stock     15,043
Proceeds from exercise of stock options 73 82 250
Proceeds from line of credit 1,594 3,752 2,186
Payments on line of credit (900) (3,928) (1,144)
Proceeds from long-term debt   2,896 1,481
Payments of long-term debt (948) (883) (485)
Net cash provided by (used in) financing activities (181) 94,621 17,331
Effect of exchange rate changes on cash and cash equivalents 94 1,168 342
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (36,391) 70,099 (195)
CASH AND CASH EQUIVALENTS-Beginning of year 83,619 13,520 13,715
CASH AND CASH EQUIVALENTS-End of year 47,228 83,619 13,520
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:      
Cash paid for interest, net of amounts capitalized 129 124 65
Cash paid for income taxes 51 617 4
NONCASH INVESTING AND FINANCING ACTIVITIES:      
Accrual related to property, plant and equipment $ 3,142 $ 2,168 $ 916