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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Apr. 02, 2011
CASH FLOWS FROM OPERATING ACTIVITIES    
Net loss $ (15,820) $ (10,674)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 4,299 4,764
Stock based compensation 1,775 3,490
Amortization of premium on marketable securities 166 0
Marketable securities recovery and accretion (1,306) (75)
Gain on disposal of equipment (22) (16)
Changes in operating assets and liabilities:    
Accounts receivable 761 9,092
Inventories 1,378 (2,305)
Prepaid expenses and other assets (1,500) (1,852)
Accounts payable 244 (4,807)
Accrued liabilities and other liabilities (950) 316
Net cash used in operating activities (10,975) (2,067)
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchases of plant and equipment (1,410) (816)
Proceeds from sale of equipment 22 0
Purchases of marketable securities (19,989) 0
Proceeds from sale of marketable securities 23,217 100
Net cash provided (used in) investing activities 1,840 (716)
CASH FLOWS FROM FINANCING ACTIVITIES    
Issuance of common stock 1,286 245
Net cash provided by financing activities 1,286 245
Net decrease in cash and cash equivalents (7,849) (2,538)
Cash and cash equivalents at beginning of period 32,695 97,129
Cash and cash equivalents at end of period $ 24,846 $ 94,591