Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Net Cash Provided by (Used in) Financing Activities [Abstract] Statement of Cash Flows [Abstract] Statement [Table] Statement [Table] Statement, Scenario [Axis] Statement, Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Statement Statement [Line Items] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Net income Net Income (Loss) Available to Common Stockholders, Basic Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Loss on disposal of fixed assets Gain (Loss) on Disposition of Assets Gain on legal settlement Gain (Loss) Related to Litigation Settlement Provision for (recovery of) receivable allowance Provision for Doubtful Accounts Gain on sale of note receivable Gain (Loss) on Sale of Notes Receivable Share-based compensation expense Share-based Compensation Income tax benefits from employee stock plans Tax Benefit from Stock Options Exercised Excess tax benefits from employee stock plans Excess Tax Benefit from Share-based Compensation, Operating Activities Provision for excess and obsolete inventories Inventory Write-down Foreign currency remeasurement loss Foreign Currency Transaction Gain (Loss), Unrealized Deferred income taxes Deferred Income Tax Expense (Benefit) Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable, net Increase (Decrease) in Accounts Receivable Inventories Increase (Decrease) in Inventories Prepaid expenses Increase (Decrease) in Prepaid Expense Other current assets Increase (Decrease) in Other Current Assets Net investment in sales-type leases Increase (Decrease) in Leasing Receivables Other assets Increase (Decrease) in Other Operating Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued compensation Increase (Decrease) in Employee Related Liabilities Accrued liabilities Increase (Decrease) in Accrued Liabilities Deferred service revenue Increase (Decrease) in Deferred Revenue Deferred gross profit Increase (Decrease) in Deferred Gross Profit The net change in the gross profit not recognized in income that consists of sales of tangible products, which have been delivered and invoiced but not yet installed less the costs of revenues, excluding the installation costs. Other long-term liabilities Increase (Decrease) in Other Noncurrent Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Purchases of short-term investments Payments to Acquire Short-term Investments Maturities of short-term investments Proceeds from Maturities, Prepayments and Calls of Short-term Investments Acquisition of intangible assets and intellectual property Acquisition of Intangible Assets and Intellectual Property Represents the value of the intangible assets and intellectual property costs of developing Patent Claims in house. Software development for external use Payments of Software Development for External Use The cash outflow associated with the development or modification of software programs or applications for external use (that is, to be sold, leased or otherwise marketed to others) that qualify for capitalization. Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Business acquisition, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Proceeds from issuance of common stock under employee stock purchase and stock option plans Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options Stock repurchases Payments for Repurchase of Common Stock Excess tax benefits from employee stock plans Excess Tax Benefit from Share-based Compensation, Financing Activities Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations Net increase in cash and cash equivalents Net Cash Provided by (Used in) Continuing Operations Cash and cash equivalents at beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Supplemental disclosure of non-cash operating activity: Supplemental Cash Flow Information [Abstract] Satisfaction of acquired legal contingency with indemnification asset (Note 2) Satisfaction of Acquired Legal Contingency with Indemnification Asset This element represents the amount of satisfaction of the acquired legal contingency with indemnification asset. This is a noncash transaction. Supplemental disclosure of non-cash operating activity Cash Flow Noncash Operating Activities Disclosure Abstract Net Cash Provided by (Used in) Investing Activities [Abstract] Cash and Cash Equivalents [Abstract] Cash and Cash Equivalents, Short-term Investments and Fair Value of Financial Instruments Cash and Cash Equivalents Disclosure [Text Block] Commitments -- None. No documentation exists for this element. -- Commitments Disclosure [Text Block] Commitments Disclosure [Text Block] Accrued Liabilities Disclosure -- None. No documentation exists for this element. -- Accrued Liabilities [Text Block] Accrued Liabilities [Text Block] Description and amounts of accrued and other liabilities disclosure at the end of the reporting period. This element may be used for the entire disclosure as a single block of text. Deferred Gross Profit[Abstract] -- None. No documentation exists for this element. -- Deferred Gross Profit [Text Block] Deferred Gross Profit [Text Block] The gross profit not recognized in income that consists of sales of tangible products, which have been delivered and invoiced but not yet installed less the costs of revenues, excluding the installation costs. Net Investment in Sales-Type Leases Disclosure -- None. No documentation exists for this element. -- Net Investment Sales-Type Leases Disclosure [Text Block] Net Investments in Sales Type Leases [Text Block] A description of the sales-type lease general terms in years and a description of the collateral. Disclosure includes a table describing the net minimum lease payments to be received, less the unearned interest portion and breaks this out into the current and non-current net investment in sales type leases. Also includes a table showing the minimum lease payments over the future five years and thereafter. Document and Entity Information -- None. No documentation exists for this element. -- Entities [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Entity Information [Line Items] Entity Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Amendment Description Amendment Description Current Fiscal Year End Date Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Public Float Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Statement of Financial Position [Abstract] Accounts receivable, allowances Allowance for Doubtful Accounts Receivable, Current Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Statement [Line Items] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization and Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Short-term investments Short-term Investments Accounts receivable, net of allowances of $512 and $497 at September 30, 2011 and December 31, 2010, respectively Accounts Receivable, Net, Current Inventories Inventory, Net Prepaid expenses Prepaid Expense, Current Deferred tax assets Deferred Tax Assets, Net, Current Other current assets Other Assets, Current Total current assets Assets, Current Property and equipment, net Property, Plant and Equipment, Net Non-current net investment in sales-type leases Noncurrent, Net Investment in Sales Type Leases The long-term portion of the net amount due as of the balance sheet date consisting of: (a) minimum lease payments due on sales-type leases, (b) unguaranteed residual value, and (c) any unamortized initial direct costs on direct financing leases; less: (i) executory costs, (ii) unearned income, and (iii) the accumulated allowance for uncollectible minimum lease payments. Goodwill Goodwill Other intangible assets Finite-Lived Intangible Assets, Net Non-current deferred tax assets Deferred Tax Assets, Net, Noncurrent Other assets Other Assets, Noncurrent Total assets Assets LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued compensation Employee-related Liabilities, Current Accrued liabilities Accrued Liabilities, Current Deferred service revenue Deferred Service Revenue The carrying amount of consideration received or receivable on service revenues as of the balance sheet date on potential earnings that were not recognized as service revenue in conformity with GAAP, and which are expected to be recognized as such within one year of the normal operating cycle. Deferred gross profit Deferred Gross Profit The gross profit not recognized in income that consists of sales of tangible products, which have been delivered and invoiced but not yet installed less the costs of revenues, excluding the installation costs. Total current liabilities Liabilities, Current Long-term deferred service revenue Long-Term Deferred Service Revenue The carrying amount of consideration received or receivable on service revenues as of the balance sheet date on potential earnings that were not recognized as service revenue in conformity with GAAP, and which are expected to be recognized as such after one year of the normal operating cycle. Other long-term liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Stockholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Total stockholders' equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders' equity Liabilities and Equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Stockholders' Equity Note [Abstract] Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Contingencies Legal Matters and Contingencies [Text Block] Unaudited Condensed Consolidated Statements of Comprehensive Income [Abstract] Unaudited Condensed Consolidated Statements of Comprehensive Income [Abstract] Other comprehensive income, net of tax: Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract] Unrealized gain on securities: Marketable Securities, Unrealized Gain (Loss) [Abstract] Unrealized gain on securities: Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Other comprehensive income Other Comprehensive Income (Loss), Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Inventory Disclosure [Abstract] Inventories Inventory Disclosure [Text Block] Property, Plant and Equipment [Abstract] Property and Equipment Property, Plant and Equipment Disclosure [Text Block] Income Statement [Abstract] Revenues: Revenues [Abstract] Product revenues Sales Revenue, Goods, Net Services and other revenues Sales Revenue, Services, Net Total revenues Revenues Cost of revenues: Cost of Revenue [Abstract] Cost of product revenues Cost of Goods Sold Cost of services and other revenues Cost of Services Restructuring charges Cost of Revenues Restructuring Charges Amount charged against earnings in the period for incurred and estimated cost of sales only associated with exit from or disposal of business activities or restructurings pursuant to a program that is planned and controlled by management, and materially changes either the scope of a business undertaken by an entity, or the manner in which that business is conducted. Total cost of revenues Cost of Revenue Gross profit Gross Profit Operating expenses: Operating Expenses [Abstract] Research and development Research and Development Expense Selling, general and administrative Selling, General and Administrative Expense Restructuring and asset impairment charges Restructuring, Asset Impairment Charges The operating expense portion of the charge against earnings resulting from the aggregate accrual and expense related to a restructuring plan including employee severance pay and benefits, relocation costs, and other disposal costs related to a closing of facilities. The operating expense portion of the charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. Total operating expenses Operating Expenses Income from operations Operating Income (Loss) Interest and other income (expense), net Other Nonoperating Income (Expense) Income before provision for income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Provision for income taxes Income Tax Expense (Benefit) Net income Net income per share: Earnings Per Share [Abstract] Net income per share-basic (in dollars per share) Earnings Per Share, Basic Net income per share-diluted (in dollars per share) Earnings Per Share, Diluted Weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Stock Option Plans and Share-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Subsequent Events [Abstract] Subsequent Event Subsequent Events [Text Block] Net Income Per Share Earnings Per Share [Text Block]