Document And Entity Information Document And Entity Information [Abstract] Statement [Tables] Statement [Table] Statement [Line Items] Statement Line Items CashAndCashEquivalentsPolicyTextBlock 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 Entity Common Stock, Shares Outstanding Entity Well-known Seasoned Issuer Entity Current Reporting Status Entity Voluntary Filers Entity Public Float Consolidated Balance Sheets [Abstract] ASSETS - balance sheet ASSETS Cash and cash equivalents- Cash and cash equivalents at end of year Cash and cash equivalents at beginning of year Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value, Total Marketable securities-current Marketable securities Marketable Securities, Current, Total Short-term marketable securities Accounts receivable, net Accounts receivable, net Inventory - net Inventory Inventory Net inventory Prepaid Expense And Other Assets Current Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current, Total Restricted cash and cash equivalents at carrying value Restricted cash Restricted cash included in current assets Deferred Tax Assets Gross Deferred Tax Assets, Net, Current, Ending Balance Deferred Tax Assets, Net, Current, Beginning Balance Deferred tax assets Deferred tax assets, net Total current assets Total current assets Property, plant and equipment, net Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, net Property, plant and equipment, net Property, Plant and Equipment Intangibles, net Intangible Assets, Net (Excluding Goodwill), Total Intangible assets Restricted cash Restricted cash included in long-term assets Restricted cash included in long term assets Deferred Tax Assets, Gross, Noncurrent Deferred tax assets Other assets Other assets Assets Total assets Total assets LIABILITIES AND STOCKHOLDERS EQUITY LIABILITIES AND STOCKHOLDERS' EQUITY Accounts Payable And Accrued Liabilities Current Total Accounts payable and accrued expenses Adverse purchase commitments. Adverse Purchase Commitments Adverse purchase commitments Adverse purchase commitments for inventory Deferred rev. Deferred revenue Deferred revenue Deferred Tax Liabilities, Current Deferred tax liabilities Total current liabilities Total current liabilities Deferred revenue, noncurrent Deferred revenue Deferred Revenue, Noncurrent, Total Deferred tax liabilities, noncurrent Deferred tax liabilities Other Other liabilities Other Liabilities Total liabilities Commitments and contingencies. Commitments and contingencies1 Commitments and contingencies (Note 12) Stockholders' equity: Common stock Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common stock, $0.01 par value, 150,000,000 shares authorized; 51,962,141 and 50,719,827 shares issued and outstanding at March 31, 2012 and 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, Total Treasury Stock, Value Treasury stock, at cost, 23,861 shares at March 31, 2012 Treasury stock, at cost Treasury Stock, Value, Ending Balance Treasury Stock, Value, Beginning Balance Treasury stock, at cost Treasury Stock Accumulated other comprehensive loss 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), Net of Tax, Total Accumulated other comprehensive income Retained Earnings Accumulated Deficit Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Accumulated deficit Accumulated deficit Total stockholders' equity Balance Balance Total stockholders' equity Liabilities and Stockholders' Equity Total liabilities and stockholders' equity Common Stock, Par or Stated Value Per Share Common stock, par value Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common Stock, Shares, Issued, Total Common stock, shares issued Common Stock, Shares, Outstanding Balance, shares Balance, shares Common stock, shares outstanding Treasury Stock, Shares Treasury Stock, Shares, Ending Balance Treasury Stock, Shares, Beginning Balance Treasury Stock, shares Consolidated Statements Of Operations [Abstract] Revenue Total revenue Revenues Revenues Revenues Cost and operating expenses: Cost of revenues Cost of Revenue, Total Research and development Research and Development Expense, Total Selling, general and administrative Selling, General and Administrative Expense, Total Restructuring Restructuring and impairments Restructuring and impairments Write-off of advance payment. Advance Payment Write-Off Write-off of advance payment Amortization of acquisition related intangibles Amortization of Intangible Assets, Total Intangible amortization expense Total cost and operating expenses Total cost and operating expenses Total operating expenses Operating income Operating income (loss) Operating (loss) income Operating (loss) income Interest Income (Expense), Net Interest income (expense), net Interest Income (Expense), Net, Total Interest income, net Other income (expense), net Other income (expense), net Income (loss) before income tax expense (Loss) income before income tax expense Income tax expense Income tax expense Income tax expense Income tax expense Net income Net loss Net (loss) income Net income (loss) Net (loss) income Net (loss) income Net (loss) income per common share Basic Net (loss) income per share basic Net income per share - basic Basic Net income (loss) per common share-basic EPS - Diluted Net (loss) income per share diluted Diluted Diluted Net income (loss) per common share-diluted Weighted average number of common shares outstanding Basic - shares outstanding Basic Shares used in per-share calculation basic Shares used in per-share calculation - basic Diluted Shares used in per-share calculation diluted Shares used in per-share calculation - diluted Consolidated Statements Of Comprehensive (Loss) Income [Abstract] Other comprehensive (loss) income, net of tax: Other comprehensive income (loss), net of tax: Other Comprehensive Income, Foreign Currency Transaction and Translation Adjustment, Net of Tax Cumulative translation adjustment Net foreign exchange rate impact Other Comprehensive Income, Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total Foreign currency translation gains (losses) Unrealized (losses) gains on cash flow hedges Unrealized (losses) gains on cash flow hedges Other Comprehensive Income, Derivatives Qualifying as Hedges, Net of Tax, Total Unrealized gains on cash flow hedges Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax Reclassificationof ineffective hedge gains to net income Reclassification of ineffective hedge gains to net income Other Comprehensive Income, Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Net unrealized losses on investments Unrealized losses on investments Unrealized losses on investments Other Comprehensive Income (Loss), Net of Tax Total other comprehensive income (loss), net of tax Comprehensive Income, Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive (loss) income Consolidated Statements Of Stockholders' Equity [Abstract] Stock Issued During Period, Value, Stock Options Exercised Exercise of stock options Stock Issued During Period, Shares, Stock Options Exercised Options/Shares, Exercised Options/Shares, Exercised Exercise of stock options, shares Stock Issued During Period, Value, Employee Stock Purchase Plan Issuance of common stock - ESPP Stock Issued During Period, Shares, Employee Stock Purchase Plans Issuance of common stock - ESPP, shares Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures, Total Issuance of common stock - restricted shares Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total Issuance of common stock - restricted shares, shares Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Total Stock-based compensation expense Share based compensation non employee Share Based Compensation Non Employee Stock-based compensation expense-non-employee Non-employee stock-based compensation expense Stock Issued During Period, Value, New Issues Issuance of stock for 401(k) match Stock Issued During Period, Shares, New Issues Shares issued in public equity offering Issuance of stock for 401(k) match, shares Issuance of common stock public offering net of costs. Issuance Of Common Stock Public Offering Net Of Costs Issuance of common stock- follow-on public offering, net of costs Issuance of common stock public offering net of costs shares. Issuance Of Common Stock Public Offering Net Of Costs Shares Issuance of common stock- follow-on public offering, net of costs, shares Contingent consideration. Contingent Consideration Contingent consideration Contingent consideration Contingent consideration shares Contingent Consideration Shares Contingent consideration, shares Noncontrolling Interest, Increase from Equity Issuance or Sale of Parent Equity Interest Minority interest investment Minority interest investment shares Minority Interest Investment Shares Minority interest investment, shares Amortization of deferred warrant costs. Amortization Of Deferred Warrant Costs Amortization of deferred warrant costs Consolidated Statements Of Cash Flows [Abstract] Cash flows from operating activities: Adjustments to reconcile net income to net cash (used in) provided by operations: Depreciation and amortization Depreciation, Depletion and Amortization, Total Depreciation and amortization expense Employee Benefits And Share Based Compensation Stock-based compensation expense Employee Benefits and Share-based Compensation, Total Stock-based compensation expense Write-off of Advanced Payment Advanced Payment, Write-Off Write-off of Advanced Payment to The Switch Write-off of advanced payment to The Switch Write-off of Patents Patents, Write-Off Patent costs Restructuring Costs Restructuring Costs, Total Restructuring charges, net of payments Goodwill, Impairment Loss Impairment of goodwill Impairment charges Impairment of goodwill Impairment of Long-Lived Assets Held-for-use Impairment of long-lived and intangible assets Long-lived asset impairment Inventory Write-down Inventory write-down Provision for excess and obsolete inventory Inventory write-down Losses on purchase commitments Losses On Purchase Commitments Adverse purchase commitment losses (recoveries), net Allowance for doubtful accounts Allowance for doubtful accounts Provision for doubtful accounts receivable Increase Decrease In Prepaid Taxes Write-off of prepaid taxes Gain (Loss) on Investments Gain (Loss) on Investments, Total Loss on minority interest investments Deferred income taxes Deferred income taxes Total deferred Other non-cash items Other non-cash items Changes in operating asset and liability accounts: Increase Decrease In Accounts Receivable Accounts receivable Accounts receivable Increase Decrease In Inventories Inventory Inventory Increase (Decrease) in Inventories, Total Increase (Decrease) in Prepaid expenses and other current assets Prepaid expenses and other current assets Prepaid expenses and other current assets Increase (Decrease) in Prepaid, Deferred Expense and Other Assets, Total Accounts payable and accrued expenses-changes Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities, Total Deferred revenue Deferred revenue Net cash used in operating activities Net cash provided by (used in) operating activities Cash used for operations Cash flows from investing activities: Purchase of property, plant and equipment Purchase of property, plant and equipment Payments to Acquire Property, Plant, and Equipment, Total Purchase of marketable securities Purchase of marketable securities Payments to Acquire Marketable Securities, Total Proceeds from the maturity of marketable securities Proceeds from Sale and Maturity of Marketable Securities, Total Proceeds from the maturity of marketable securities Change in restricted cash Change in restricted cash Increase (Decrease) in Restricted Cash, Total Purchase of intangible assets Purchase of intangible assets Payments to Acquire Additional Interest in Subsidiaries Purchase of minority investments Purchase of minority investment Advanced payment for planned acquisition Advanced Payment For Planned Acquisition Advanced payment for planned acquisition Change in other assets Change in other assets Change in other assets Change in other assets Net cash used in investing activities Net cash (used in) provided by investing activities Cash flows from financing activities: Payments in lieu of issuance of common stock for payroll taxes. Payments In Lieu Of Issuance Of Common Stock For Payroll Taxes Employee taxes paid related to net settlement of equity awards Proceeds from Issuance of Debt Proceeds from debt Repayments of Debt Repayment of debt Repayment of debt Proceeds from Issuance Initial Public Offering Proceeds from public equity offering, net Proceeds from exercise of employee stock options and ESPP Proceeds from exercise of employee stock options Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Effect of exchange rate changes on cash and cash equivalents Effect of exchange rate changes on cash and cash equivalents Net decrease in cash and cash equivalents Net (decrease) increase in cash and cash equivalents Supplemental Cash Flow Information [Abstract] Supplemental schedule of cash flow information: Income Taxes Paid Cash paid for income taxes Cash paid for income taxes, net of refunds Non-cash contingent consideration in connection with acquisitions Non-Cash Contingent Consideration In Connection With Acquisitions Non-cash contingent consideration in connection with acquisitions Non-cash issuance of common stock Non Cash Issuance Of Common Stock Non-cash issuance of common stock Nature Of The Business And Operations [Abstract] Nature Of The Business And Operations [Abstract] Nature of Operations [Text Block] Nature Of The Business And Operations Summary Of Significant Accounting Policies [Abstract] Significant Accounting Policies [Text Block] Summary Of Significant Accounting Policies Marketable Securities And Fair Value Disclosures [Abstract] Marketable Securities And Fair Value Disclosures [Abstract] Marketable Securities And Fair Value Disclosures [Text Block] Marketable Securities And Fair Value Disclosures [Text Block] Marketable Securities And Fair Value Disclosures Derivative Financial Instruments [Abstract] Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative Financial Instruments Accounts Receivable [Abstract] Accounts Receivable Disclosure [Text Block] Accounts Receivable Disclosure [Text Block] Accounts Receivable Inventory [Abstract] Inventory Disclosure Text Block Inventory Property, Plant And Equipment [Abstract] Property, Plant and Equipment Disclosure [Text Block] Property, Plant And Equipment Goodwill And Other Intangible Assets [Abstract] Goodwill and Intangible Assets Disclosure [Text Block] Goodwill And Other Intangible Assets Accounts Payable And Accrued Expenses [Abstract] Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accounts Payable And Accrued Expenses Income Taxes [Abstract] Income Tax Disclosure Text Block Income Taxes Stockholders' Equity [Abstract] Stockholders' Equity Note Disclosure [Text Block] Stockholders' Equity Commitments And Contingencies [Abstract] Commitments And Contingencies Disclosure Text Block Commitments And Contingencies Employee Benefit Plans [Abstract] Pension and Other Postretirement Benefits Disclosure [Text Block] Employee Benefit Plans Equity Investments [Abstract] Equity Investments [Abstract] Equity Method Investments Disclosure [Text Block] Equity Investments Equity Method Investments Restructuring And Impairments [Abstract] Restructuring Impairment And Other Activities Disclosure [Text Block] Restructuring And Impairments Business Segment And Geographic Information [Abstract] Segment Reporting Disclosure Text Block Business Segment And Geographic Information Business Segment and Geographic Information Quarterly Financial Data [Abstract] Quarterly Financial Information [Text Block] Quarterly Financial Data Subsequent Events [Abstract] Subsequent Events [Text Block] Subsequent Events Recent Accounting Pronouncements [Abstract] The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. New Accounting Pronouncements And Changes In Accounting Principles [Text Block] Recent Accounting Prounouncements Valuation And Qualifying Accounts [Abstract] Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Valuation And Qualifying Accounts Consolidation, Policy [Policy Text Block] Basis Of Consolidation Use of Estimates, Policy [Policy Text Block] Use Of Estimates Cash and Cash Equivalents, Policy [Policy Text Block] Cash Equivalents Marketable Securities, Policy [Policy Text Block] Marketable Securities