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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net loss $ (9,122) $ (37,921)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 2,310 3,993
Impairment of goodwill and purchased intangible assets 0 29,337
Provision for bad debts 156 38
Inventory provision 65 251
Share-based compensation expense 949 1,834
Non-cash income tax expense (benefit) (120) 111
Changes in assets and liabilities:    
Accounts receivable (1,026) (12,984)
Inventories 8,761 (1,247)
Prepaid expenses and other assets 55 (1,865)
Accounts payable (644) (2,683)
Accrued expenses, income taxes, and other 499 2,913
Net cash provided by (used in) operating activities 1,883 (18,223)
Cash flows from investing activities:    
Purchases of property and equipment (2,852) (1,170)
Purchases of marketable securities (3,754) (11,145)
Marketable securities maturities / sales 3,159 5,474
Net cash used in investing activities (3,447) (6,841)
Cash flows from financing activities:    
Proceeds from the issuance of short-term debt 7,000 0
Principal repayments of short-term debt (2,178) 0
Restricted cash relating to short-term debt (661) 0
Principal payments under capital lease obligations 0 (29)
Proceeds from stock option exercises and ESPP net of taxes paid on vested restricted stock units (304) (211)
Net cash provided by (used in) financing activities 3,857 (240)
Effect of exchange rates on cash and cash equivalents (65) 15
Net increase (decrease) in cash and cash equivalents 2,228 (25,289)
Cash and cash equivalents, beginning of period 16,044 47,069
Cash and cash equivalents, end of period 18,272 21,780
Cash paid during the year for:    
Interest 0 1
Income taxes $ 26 $ 20