Condensed Consolidated Balance Sheets (Unaudited) Condensed Consolidated Balance Sheets (Unaudited) [Abstract] ASSETS ASSETS [Abstract] Current assets: Current assets: [Abstract] Cash and cash equivalents Short-term investments Accounts receivable, net of allowances of $5 in 2012 and 2011 Inventories Deferred income tax assets, net - current Prepaid expenses and other current assets Total current assets Property and equipment, net Long-term investments Deferred income tax assets, net - long-term Other assets Total assets LIABILITIES AND STOCKHOLDERS’ EQUITY LIABILITIES AND STOCKHOLDERS’ EQUITY [Abstract] Current liabilities: Current liabilities: [Abstract] Accounts payable Accrued compensation and related benefits Accrued liabilities Total current liabilities Non-current income tax liabilities Total liabilities Commitments and contingencies (Note 7) Stockholders' equity: Stockholders' equity: [Abstract] Common stock, $0.001 par value; shares authorized: 150,000,000; shares issued and outstanding: 35,431,808 and 33,826,032 in 2012 and 2011, respectively Retained earnings Accumulated other comprehensive income Total stockholders’ equity Total liabilities and stockholders’ equity Allowances (in Dollars) Common stock, par value (in Dollars per share) Common stock, shares authorized Common stock, shares issued Common stock, shares outstanding Condensed Consolidated Statements of Operations (Unaudited) Condensed Consolidated Statements of Operations (Unaudited) [Abstract] Revenue Cost of revenue (1) Gross profit Operating expenses: Operating expenses: [Abstract] Research and development (2) Selling, general and administrative (3) Litigation expense (benefit), net Total operating expenses Income from operations Interest income and other, net Income before income taxes Income tax provision (benefit) Net income Basic net income per share (in Dollars per share) Diluted net income per share (in Dollars per share) Weighted average common shares outstanding: Weighted average common shares outstanding: [Abstract] Basic (in Shares) Diluted (in Shares) Condensed Consolidated Statements of Comprehensive Income (Unaudited) Condensed Consolidated Statements of Comprehensive Income (Unaudited) [Abstract] Net income Other comprehensive income (loss), net of tax: Other comprehensive income (loss), net of tax: [Abstract] Auction-rate securities valuation reserve adjustment Unrealized gain/ (loss) on available-for-sale securities Foreign currency translation adjustments Comprehensive income Condensed Consolidated Statements of Cash Flows (Unaudited) Condensed Consolidated Statements of Cash Flows (Unaudited) [Abstract] Cash flows from operating activities: Cash flows from operating activities: [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to reconcile net income to net cash provided by operating activities: [Abstract] Depreciation and amortization Loss on disposal of property and equipment Amortization and realized gain on debt instruments Credit gain on auction-rate securities Tax benefit from stock option transactions Excess tax benefit from stock option transactions Stock-based compensation Changes in operating assets and liabilities: Changes in operating assets and liabilities: [Abstract] Accounts receivable Inventories Prepaid expenses and other current assets Accounts payable Accrued and other long-term liabilities Accrued income taxes payable and noncurrent tax liabilities Accrued compensation and related benefits Net cash provided by operating activities Cash flows from investing activities: Cash flows from investing activities: [Abstract] Property and equipment purchases Proceeds from sale of property and equipment Purchase of intangible assets Purchases of short-term investments Proceeds from sale of short-term investments Proceeds from sale of long-term investments Net cash provided by (used in) investing activities Cash flows from financing activities: Cash flows from financing activities: [Abstract] Proceeds from issuance of common stock Proceeds from employee stock purchase plan Repurchase of common stock Excess tax benefits from stock option transactions Net cash provided by (used in) financing activities Effect of change in exchange rates Net increase (decrease) in cash and cash equivalents Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Supplemental disclosures for cash flow information: Supplemental disclosures for cash flow information: [Abstract] Cash paid for taxes Supplemental disclosures of non-cash investing and financing activities: Supplemental disclosures of non-cash investing and financing activities: [Abstract] Liability accrued for equipment purchases Reversal of temporary impairment of auction-rate securities Note 1 - Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Note 2 - Stock-Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Note 3 - Inventories Inventory Disclosure [Text Block] Note 4 - Accrued Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Note 5 - Net Income per Share Earnings Per Share [Text Block] Note 6 - Segment Information Segment Reporting Disclosure [Text Block] Note 7 - Litigation Legal Matters and Contingencies [Text Block] Note 8 - Fair Value Measurements Fair Value Disclosures [Text Block] Note 9 - Income Taxes Income Tax Disclosure [Text Block] Note 10 - Stock Repurchase Program Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block] Note 11 - Subsequent Events Subsequent Events [Text Block] Significant Accounting Policies (Abstract) Significant Accounting Policies New Accounting Pronouncements, Policy [Policy Text Block] SummaryType [Domain] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Schedule of Share-based Compensation, Activity [Table Text Block] Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used Schedule of Inventory, Current [Table Text Block] Schedule of Accrued Liabilities [Table Text Block] Schedule of Product Warranty Liability [Table Text Block] Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block] Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] Revenue from External Customers by Products and Services [Table Text Block] Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block] Fair Value, by Balance Sheet Grouping [Table Text Block] Schedule of Other Current Assets [Table Text Block] Investments Classified by Contractual Maturity Date [Table Text Block] Fair Value, Assets Measured on Recurring Basis [Table Text Block] Unrealized Gain (Loss) on Investments [Table Text Block] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Schedule of Repurchase Agreements [Table Text Block] Stock Based Compensation Plan Expenses Stock Based Compensation Plan Expenses [Abstract] Award Type [Domain] Stock Based Compensation Expense 2004 Plan Options Available for Grant 2004 Plan Options Available for Grant [Abstract] Plan Name [Domain] Available for Grant as of December 31, 2011 2012 Additions to Plan 2012 Grants 2012 Cancellations Available for Grant as of September 30, 2012 2004 Plan Option Plan Status 2004 Plan Option Plan Status [Abstract] Outstanding at Outstanding at Outstanding at (in Dollars per share) Outstanding at (in Dollars per share) Outstanding at Outstanding at (in Dollars) Outstanding at (in Dollars) Options granted (weighted-average fair value of $6.69 per share) Options granted (weighted-average fair value of $6.69 per share) (in Dollars per share) Options exercised Options exercised (in Dollars per share) Options forfeited and expired Options forfeited and expired (in Dollars per share) Options exercisable at September 30, 2012 and expected to become exercisable Options exercisable at September 30, 2012 and expected to become exercisable (in Dollars per share) Options exercisable at September 30, 2012 and expected to become exercisable (in Dollars) Options exercisable at September 30, 2012 and expected to become exercisable Options vested and exercisable at September 30, 2012 Options vested and exercisable at September 30, 2012 (in Dollars per share) Options vested and exercisable at September 30, 2012 (in Dollars) Options vested and exercisable at September 30, 2012 2004 Plan Fair Value Assumptions 2004 Plan Fair Value Assumptions [Abstract] Expected term (years) Expected volatility Risk-free interest rate Dividend yield 2004 Plan Restricted Stock Summary 2004 Plan Restricted Stock Summary [Abstract] Outstanding at Outstanding at Outstanding at (in Dollars per share) Outstanding at (in Dollars per share)