Condensed Consolidated Balance Sheets (in thousands, except par value and share amounts) (Unaudited) Condensed Consolidated Balance Sheets (in thousands, except par value and share amounts) (Unaudited) [Abstract] ASSETS ASSETS [Abstract] Current assets: Current assets: [Abstract] Cash and cash equivalents Short-term investments Accounts receivable, net of allowances of $43 in 2011 and $0 in 2010 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 Other long-term liabilities Total liabilities Stockholders' equity: Stockholders' equity: [Abstract] Common stock, $0.001 par value, $34 and $35 in 2011 and 2010, respectively; shares authorized: 150,000,000; shares issued and outstanding: 33,693,751 and 35,063,033 in 2011 and 2010, 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, value (in Dollars) Common stock, shares authorized Common stock, shares issued Common stock, shares outstanding Condensed Consolidated Statements of Operations (in thousands, except per share amounts) (Unaudited) Condensed Consolidated Statements of Operations (in thousands, except per share amounts) (Unaudited) [Abstract] Revenue Cost of revenue Gross profit Operating expenses: Operating expenses: [Abstract] Research and development Selling, general and administrative Litigation expense Total operating expenses Income from operations Other income (expense): Other income (expense): [Abstract] Interest and other income Interest and other expense Total other income, 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 Cash Flows (in thousands) (Unaudited) Condensed Consolidated Statements of Cash Flows (in thousands) (Unaudited) [Abstract] Cash flows from operating activities: Cash flows from operating activities: [Abstract] Net income 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 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 Deferred rent Net cash provided by operating activities Cash flows from investing activities: Cash flows from investing activities: [Abstract] Property and equipment purchases Purchases of short-term investments Proceeds from sale of short-term investments Proceeds from sale of long-term investments Changes in restricted assets 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 used in financing activities Effect of change in exchange rates Net increase 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 Temporary impairment reversal of auction-rate securities Note 1 - Basis of Presentation Significant Accounting Policies [Text Block] Note 2 - Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Note 3 - Inventories - Inventories consist of the following (in thousands): Inventory Disclosure [Text Block] Note 4 - Accrued Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Note 5 - Net Income per Share and Comprehensive Income Earnings Per Share [Text Block] Note 6 - Segment Information Segment Reporting Disclosure [Text Block] Note 7 - Litigation Legal Costs, Policy [Policy 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 Treasury Stock [Text Block] Scenario, Unspecified [Domain] Statement, Scenario [Axis] Document and Entity Information [Abstract] Assets, Current Entity Common Stock, Shares Outstanding Cash and Cash Equivalents, Period Increase (Decrease) Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Payments to Acquire Property, Plant, and Equipment Entity Central Index Key Liabilities, Current Operating Expenses Increase (Decrease) in Accrued Salaries Net Cash Provided by (Used in) Investing Activities Net Cash Provided by (Used in) Operating Activities Document Period End Date Payments to Acquire Short-term Investments Increase (Decrease) in Accounts Payable Increase (Decrease) in Prepaid Expense and Other Assets Amendment Flag Payments for (Proceeds from) Investments Net Cash Provided by (Used in) Financing Activities Document Type Increase (Decrease) of Restricted Investments Assets Amendment Description Payments for Repurchase of Common Stock Nonoperating Income (Expense) Document Fiscal Period Focus Current Fiscal Year End Date Liabilities and Equity Operating Income (Loss) Interest Expense, Other Gross Profit Entity Voluntary Filers Liabilities Entity Public Float Entity Filer Category Document Fiscal Year Focus Entity Well-known Seasoned Issuer Entity Registrant Name Increase (Decrease) in Inventories Entity Current Reporting Status Statement [Table] Statement [Line Items]