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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net loss $ (22,107) $ (74,354)
Adjustments to reconcile net loss to net cash used in operating activities:    
Loss on sale/disposal of fixed asset 18 90
Depreciation and amortization 6,774 9,747
Impairment of goodwill and purchased intangible assets 0 49,821
Provision for bad debts 1,005 39
Net impairment loss on marketable securities 0 39
Inventory provision 3,069 1,663
Share-based compensation expense 2,848 5,409
Non-cash income tax expense 266 194
Changes in assets and liabilities:    
Accounts receivable (5,895) (3,460)
Inventories 8,922 4,089
Prepaid expenses and other assets (2,169) (1,238)
Accounts payable 2,832 (15,108)
Accrued expenses, income taxes, and other 255 233
Net cash used in operating activities (4,182) (22,836)
Cash flows from investing activities:    
Purchases of property and equipment (5,048) (4,021)
Purchases of marketable securities (22,238) (31,871)
Marketable securities maturities / sales 31,731 27,506
Net cash provided by (used in) investing activities 4,445 (8,386)
Cash flows from financing activities:    
Proceeds from the issuance of short-term debt 13,400 5,000
Principal repayments of short-term debt (10,969) (5,000)
Principal payments under capital lease obligations 0 (46)
Proceeds from stock option exercises and ESPP net of taxes paid on vested restricted stock units (515) 583
Net cash provided by financing activities 1,916 537
Effect of exchange rates on cash and cash equivalents (85) (43)
Net increase (decrease) in cash and cash equivalents 2,094 (30,728)
Cash and cash equivalents, beginning of period 16,044 47,069
Cash and cash equivalents, end of period 18,138 16,341
Cash paid during the year for:    
Interest 31 1
Income taxes 59 100
Supplemental disclosures of non-cash investing activities:    
Building rent incentives to fund leasehold improvements $ 359 $ 0