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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities:    
Net loss $ (42,421) $ (25,986)
Adjustments to reconcile net loss to net cash used in operating activities:    
Loss on sale/disposal of fixed asset 28  
Depreciation and amortization 6,972 9,686
Loss on goodwill and intangible assets impairment 29,337 75
Provision for bad debts 88 123
Net impairment loss on marketable securities 39 154
Inventory provision 316 320
Share-based compensation expense 3,657 2,486
Non-cash income tax expense (benefit) 97 (401)
Changes in assets and liabilities:    
Accounts receivable (11,271) 21,925
Inventories 2,398 (7,371)
Prepaid expenses and other assets (2,250) 3,010
Accounts payable (10,869) (20,965)
Accrued expenses, income taxes, and other 425 (575)
Net cash used in operating activities (23,454) (17,519)
Cash flows from investing activities:    
Purchases of property and equipment (3,588) (3,835)
Purchases of intangible assets   (100)
Purchases of marketable securities (17,530) (10,959)
Marketable securities maturities/sales 12,059 47,674
Net cash provided by (used in) investing activities (9,059) 32,780
Cash flows from financing activities:    
Principal payments under capital lease obligations (46) (55)
Proceeds from stock option exercises and ESPP net of taxes paid on vested restricted stock units 734 (622)
Net cash provided by (used in) financing activities 688 (677)
Effect of exchange rates on cash and cash equivalents (47) 54
Net increase (decrease) in cash and cash equivalents (31,872) 14,638
Cash and cash equivalents, beginning of period 47,069 17,375
Cash and cash equivalents, end of period 15,197 32,013
Cash paid during the year for:    
Interest 1 3
Income taxes 39 152
Supplemental disclosures of non-cash financing activities:    
Marketable equity securities received in settlement of note receivable   $ 384