Document and Entity Information [Abstract] Document And Entity Information [Abstract] Statement [Table] Statement [Line Items] Document Type Amendment Flag Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Filer Category Entity Common Stock, Shares Outstanding Condensed Consolidated Balance Sheets [Abstract] ASSETS Cash and cash equivalents Cash and cash equivalents, end of period Cash and cash equivalents, beginning of period Cash and Cash Equivalents, at Carrying Value, Total Marketable securities Marketable securities Accounts receivable, net of allowance for doubtful accounts of $228 at September 30, 2010 and $741 at December 31, 2009 Accounts receivable, net of allowance for doubtful accounts of $283 at March 31, 2012 and $245 at December 31, 2011 Accounts receivable, net of allowance for doubtful accounts of $283 at March 31, 2012 and $245 at December 31, 2011 Inventory Net Inventories Inventories Deferred Tax Assets Net Current Deferred Tax Assets, Net, Current, Ending Balance Deferred Tax Assets, Net, Current, Beginning Balance Deferred tax assets, net Deferred Tax Assets, Net, Current, Total Prepaid Expense and Other Assets, Current Prepaid expenses and other Prepaid Expense and Other Assets, Current, Total Total current assets Total current assets Property and equipment, net of accumulated depreciation of $47,449 at September 30, 2010 and $40,279 at December 31, 2009 Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Property and equipment, net of accumulated depreciation of $61,625 at March 31, 2012 and $59,217 at December 31, 2011 Property and equipment, net of accumulated depreciation of $47,449 at September 30, 2010 and $40,279 at December 31, 2009 Marketable Securities Noncurrent Marketable securities Marketable securities Intangible assets, net of accumulated amortization of $3,058 at September 30, 2010 and $2,441 at December 31, 2009 Intangible assets, net of accumulated amortization of $10,508 at March 31, 2012 and $10,899 at December 31, 2011 Intangible assets, net of accumulated amortization of $3,058 at September 30, 2010 and $2,441 at December 31, 2009 Goodwill Goodwill, Ending Balance Goodwill, Beginning Balance Goodwill, Total Deferred tax assets, net Deferred Tax Assets, Net, Noncurrent, Total Other assets Other Assets, Noncurrent, Total Total assets Total assets LIABILITIES AND STOCKHOLDERS' EQUITY Accounts payable Accounts Payable, Current, Total Accrued expenses Accrued Liabilities, Current, Total Total current liabilities Total current liabilities Other long-term liabilities Other Liabilities, Noncurrent, Total Total liabilities Total liabilities Stockholders' equity: Preferred stock, par value $0.001; 2,000 shares authorized and none outstanding Preferred Stock, Value, Issued, Ending Balance Preferred Stock, Value, Issued, Beginning Balance Preferred Stock, Value, Issued, Total Common stock, par value $0.001; 50,000 shares authorized, 31,620 and 31,092 shares issued and outstanding at September 30, 2010 and December 31, 2009, respectively Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common stock, par value $0.001; 50,000 shares authorized, 32,385 and 32,262 shares issued and outstanding at March 31, 2012 and December 31, 2011, respectively Common Stock, Value, Issued, Total Additional paid-in capital Additional Paid in Capital, Ending Balance Additional Paid in Capital, Beginning Balance Additional paid-in capital Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance Accumulated other comprehensive income (loss) Accumulated other comprehensive income Accumulated deficit Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Accumulated deficit Stockholders' Equity before Treasury Stock Total stockholders' equity before treasury stock Treasury stock at cost; 2,436 common shares at September 30, 2010 and December 31, 2009, respectively Treasury stock at cost; 2,436 common shares at March 31, 2012 and December 31, 2011, respectively Treasury Stock, Value, Ending Balance Treasury Stock, Value, Beginning Balance Treasury stock at cost; 2,436 common shares at September 30, 2011 and December 31, 2010 Total stockholders' equity Balance Balance Total stockholders' equity Total liabilities and stockholders' equity Total liabilities and stockholders' equity Accounts receivable, allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current, Ending Balance Allowance for Doubtful Accounts Receivable, Current, Beginning Balance Property and equipment, accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total Intangible assets, accumulated amortization Preferred stock, par value Preferred stock, shares authorized Preferred stock, shares outstanding Preferred Stock, Shares Outstanding, Ending Balance Preferred Stock, Shares Outstanding, Beginning Balance Common stock, par value Common stock, shares authorized Common stock, shares issued Common Stock, Shares, Issued, Total Common stock, shares outstanding Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Treasury stock, shares Treasury Stock, Shares, Ending Balance Treasury Stock, Shares, Beginning Balance Condensed Consolidated Statements Of Operations And Comprehensive Income (Loss) [Abstract] Net revenues Net revenues Cost of revenues Cost of net revenues Cost of revenues Gross profit Gross profit Operating costs and expenses: Research and development Research and development Sales and marketing Sales and marketing General and administrative General and administrative Goodwill, Impairment Loss Goodwill and intangible assets impairment losses Loss on goodwill and intangible assets impairments Amortization of Acquired Intangible Assets Amortization of purchased intangible assets Operating Expenses Total operating costs and expenses Operating income (loss) Operating loss Other income: Interest (expense) income, net Interest income, net Interest Income (Expense), Net, Total Other income, net Other income, net Other income, net Income (loss) before income taxes Loss before income taxes Income Tax Expense Benefit Income tax expense Income tax expense (benefit) Net Income (Loss) Attributable to Parent Net income (loss) Net loss Net loss Per share data: Basic Basic Earnings Per Share Diluted Diluted Diluted Weighted average shares used in computation of basic and diluted net income (loss) per share: Weighted average shares used in computation of basic and diluted net loss per share: Weighted Average Number Of Shares Outstanding Basic Basic Weighted Average Number of Shares Outstanding, Basic, Total Diluted Weighted Average Number of Shares Outstanding, Diluted, Total Comprehensive Income, Net of Tax, Attributable to Parent Comprehensive loss Comprehensive Income Condensed Consolidated Statements Of Cash Flows [Abstract] Cash flows from operating activities: Adjustments to reconcile net loss to net cash provided by operating activities: Adjustments to reconcile net loss to net cash used in operating activities: Depreciation and amortization Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction, Total Gain (Loss) on Sale of Property Plant Equipment Loss on disposal of fixed assets Loss on disposal of fixed assets Gain (Loss) on Sale of Property Plant Equipment, Total Provision for bad debts Inventory provision Share-based compensation expense Share-based compensation expense Excess tax benefits from equity based compensation Excess tax benefits from equity based compensation Excess tax benefits from equity based compensation Deferred income tax expense Non-cash income tax expense (benefit) Deferred Income Tax Expense (Benefit), Total Changes in assets and liabilities: Accounts receivable Accounts receivable Inventories Inventories Inventories Prepaid expenses and other assets Prepaid expenses and other assets Prepaid expenses and other assets Increase Decrease In Accounts Payable Accounts payable Accounts payable Accrued expenses, income taxes, and other Accrued expenses, income taxes, and other Net cash provided by operating activities Net cash used in operating activities Cash flows from investing activities: Purchases of property and equipment Purchases of property and equipment Purchases of property and equipment Purchases of securities Purchases of securities Purchases of securities Proceeds From Sale And Maturity Of Marketable Securities Securities maturities/sales Securities maturities/sales Proceeds from Sale and Maturity of Marketable Securities, Total Net cash provided (used) by investing activities Net cash provided by (used in) investing activities Cash flows from financing activities: Repayments of Long-term Capital Lease Obligations Principal payments under capital lease obligations Proceeds from exercise of stock options and employee stock purchase plan Proceeds from stock option exercises net of taxes paid on vested restricted stock units Excess Tax Benefit From Share Based Compensation Financing Activities Excess tax benefits from equity based compensation Net cash (used in) provided by financing activities Net cash used in financing activities Effect of exchange rates on cash and cash equivalents Effect of exchange rates on cash and cash equivalents Net increase in cash and cash equivalents Net decrease in cash and cash equivalents Supplemental disclosures of cash flow information: Interest Interest Paid, Net, Total Income Taxes Paid Net Income taxes Income Taxes Paid, Net, Total Cash Flow Noncash Financing Activities Disclosure [Abstract] Cash Flow Noncash Financing Activities Disclosure [Abstract] Supplemental disclosures of non-cash financing activities: Marketable equity securities received in settlement of note receivable. Marketable Equity Securities Received in Settlement of Note Receivable Marketable equity securities received in settlement of note receivable Basis Of Presentation [Abstract] Basis Of Presentation Basis of Presentation Balance Sheet Details [Abstract] Condensed Financial Information of Parent Company Only Disclosure [Text Block] Balance Sheet Details Intangible Assets [Abstract] Intangible Assets Disclosure [Text Block] Intangible Assets Goodwil Abstract. Goodwill [Abstract] Goodwill Disclosure [Text Block] Goodwill Fair Value Measurement Of Assets And Liabilities [Abstract] Fair Value Measurement Inputs Disclosure Text Block Fair Value Measurement Of Assets And Liabilities Share-Based Compensation [Abstract] Disclosure Of Compensation Related Costs Share Based Payments Text Block Share-Based Compensation Segment Information And Concentrations Of Risk [Abstract] Segment Reporting Disclosure Text Block Segment Information and Concentrations of Risk Segment Information And Concentrations Of Risk Earnings Per Share [Abstract] Net income (loss) per share: Earnings Per Share Text Block Earnings Per Share Commitments And Contingencies [Abstract] Commitments And Contingencies Disclosure Text Block Commitments And Contingencies Comprehensive Loss [Abstract] Comprehensive Income Note Text Block Comprehensive Loss Income Taxes [Abstract] Income Tax Disclosure Text Block Income Taxes