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 Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Entity Common Stock Entity Common Stock, Shares Outstanding Entity Public Float Entity Public Float Consolidated Balance Sheets [Abstract] ASSETS - balance sheet ASSETS Cash and cash equivalents Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period 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 Accounts receivable, net Inventory - net Inventory Net inventory Net inventory Prepaid Expense And Other Assets Current Prepaid expenses and other current assets 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, net Intangibles, net Intangibles, net Intangible Assets, Net (Excluding Goodwill), Total Intangible assets Restricted cash Restricted cash Restricted cash included in long term assets Deferred Tax Assets, Gross, Noncurrent Deferred tax assets Other 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 Notes Payable, Current Notes Payable, Current, Total Note payable, current portion, net of discount of $458 as of March 31, 2013 Convertible Notes Payable, Current Convertible note, current portion, net of discount of $4,289 as of March 31, 2013 Derivative Liabilities, Current Derivative liability of note Derivative liability 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 Federal and state deferred tax liability Total current liabilities Total current liabilities Notes Payable, Noncurrent Notes Payable, Noncurrent, Total Note payable, net of discount of $95 as of March 31, 2013 Convertible Notes Payable, Noncurrent Convertible note net of discount of $600 as of March 31, 2013 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 contingencies1 Commitments and contingencies (Note 12) Commitments and contingencies (Note 13) 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; 60,300,466 and 51,962,141 shares issued and outstanding at March 31, 2013 and 2012, 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 Additional Paid in Capital, Total Treasury Stock, Value Treasury stock, at cost, 34,445 shares at March 31, 2013 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 Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer net of discounts. Notes Payable, Current, Net Note payable, current portion, net of discount Carrying value as of the balance sheet date of the portion of long-term debt due within one year or the operating cycle if longer identified as Convertible Notes Payable net of discount. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder. Convertible Notes Payable, Current, Net Current portion of convertible note, net of discount Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion, net of discount. Notes Payable, Noncurrent, Net Note payable, net of current portion and discount Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion, net of discount. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder. Convertible Notes Payable, Noncurrent, Net Convertible note net of current portion and discount 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 Common Stock, Shares, Issued, Total Common Stock, Shares, Outstanding Balance, shares 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 Total revenue Revenues Revenues Cost and operating expenses: Cost of revenues Cost of revenues Cost of Revenue, Total Research and development Research and development Research and Development Expense, Total Selling, general and administrative 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 Deferred Policy Acquisition Cost, Amortization Expense Amortization of acquisition related intangibles Deferred Policy Acquisition Cost, Amortization Expense, Total Total cost and operating expenses Total cost and operating expenses Total operating expenses Operating income Operating loss Operating loss Operating (loss) income Gain (loss) in change of fair value of derivative instruments and warrants. Gain (Loss) In Change Of Fair Value Of Derivative Instruments And Warrants Change in fair value of derivatives and warrants Gain (loss) in change of fair value of derivative instruments and warrants Change in fair value of derivatives and warrants Interest Income (Expense), Net Interest income, net Interest Income (Expense), Net, Total Interest (expense) income, net Other income (expense), net Other income (expense), net Other (expense) income, net Income (loss) before income tax expense (Loss) income before income tax (benefit) expense Income tax expense Income tax expense Income tax expense (benefit) Income tax (benefit) expense Income tax (benefit) expense Net income Net loss Net (loss) income Net (loss) income Net loss Net loss Computation Of Net (Loss) Income Per Common Share [Abstract] Net loss per common share Basic Net (loss) income per share basic Basic Basic Net loss per common share - basic EPS - Diluted Net (loss) income per share diluted Diluted Diluted Net loss per common share - diluted Weighted average number of common shares outstanding Basic - shares outstanding Basic Shares used in per-share calculation basic Weighted-average shares of common stock outstanding Diluted 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 Net foreign exchange rate impact Cumulative translation adjustment Other Comprehensive Income, Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total Foreign currency translation (losses) gains Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax Unrealized gains on cash flow hedges Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Total Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax 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 Net 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 Consolidated Statements Of Stockholders' Equity [Abstract] Stock Issued During Period, Value, Stock Options Exercised Exercise of stock options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 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 Issuance of common stock - restricted shares Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures, Total Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Issuance of common stock - restricted shares, shares Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock-based compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Total Share based compensation, non employee. Share Based Compensation Non Employee Non-employee stock-based compensation expense Stock Issued During Period, Value, Employee Benefit Plan Issuance of stock for calendar 401(k) match Stock Issued During Period, Shares, Employee Benefit Plan Issuance of stock for calendar 401(k) match, shares Stock Issued During Period, Value, New Issues Issuance of common stock- follow-on public offering, net of costs Stock Issued During Period, Shares, New Issues Issuance of common stock- follow-on public offering, net of costs, shares Stock Issued During Period, Value, Other Issuance of common stock to settle liabilities Stock Issued During Period, Shares, Other Common stock issued to vendor Issuance of common stock to settle liabilities, shares Contingent consideration. Contingent Consideration Contingent consideration Contingent consideration shares. Contingent Consideration Shares Contingent consideration shares Stock Issued During Period, Value, Treasury Stock Reissued Treasury stock, at cost Consolidated Statements Of Cash Flows [Abstract] Cash flows from operating activities: Adjustments to reconcile net (loss) income to net cash (used in) provided by operations: Depreciation and amortization 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 Advanced payment write-off 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 of Long-Lived Assets Held-for-use Impairment of long-lived and intangible assets Inventory Write-down Inventory write-down Provision for excess and obsolete inventory Inventory write-down Losses on purchase commitments, net. Losses On Purchase Commitments Adverse purchase commitment losses (recoveries), net Losses on purchase commitments Provision for Doubtful Accounts Provision for doubtful accounts receivable Increase (Decrease) in Prepaid Taxes Write-off of prepaid taxes Gain (Loss) on Investments Loss on minority interest investments Gain (Loss) on Investments, Total Loss on minority interest investments Amortization of Financing Costs and Discounts Non-cash interest expense Amortization of Financing Costs and Discounts, Total Deferred Income Tax Expense (Benefit) Deferred income taxes Deferred Income Tax Expense (Benefit), Total 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 Deferred revenue Net cash used in operating activities Net cash 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 Payments to Acquire Marketable Securities Purchase of marketable securities Payments to Acquire Marketable Securities, Total Proceeds from Sale of Property, Plant, and Equipment Proceeds from the sale of property, plant and equipment Proceeds from Sale of Property, Plant, and Equipment, 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 Additional restricted cash 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 provided by (used in) 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 Debt, Net of Issuance Costs Proceeds from the issuance of debt, net of expenses Repayments of Long-term Debt Repayment of debt Repayments of Long-term Debt, Total 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 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 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 Noncash or Part Noncash Acquisition, Value of Assets Acquired Non-cash contingent consideration in connection with acquisitions Noncash or Part Noncash Acquisition, Value of Assets Acquired, Total Debt Conversion, Converted Instrument, Amount Convertible amount of installment payment Issuance of common stock to settle liabilities Interest Paid Cash paid for interest Interest Paid, Total Nature Of The Business And Operations And Liquidity [Abstract] Nature of Operations [Text Block] Nature Of The Business And Operations And Liquidity Description Of The Business And Basis Of Presentation Summary Of Significant Accounting Policies [Abstract] Significant Accounting Policies [Text Block] Summary Of Significant Accounting Policies Marketable Securities And Fair Value Disclosures [Abstract] Fair Value Disclosures [Text Block] Marketable Securities And Fair Value Disclosures Accounts Receivable [Abstract] Loans, Notes, Trade and Other Receivables 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 Intangible Assets [Abstract] Intangible Assets Disclosure [Text Block] Intangible Assets Accounts Payable And Accrued Expenses [Abstract] Product Warranty Disclosure [Text Block] Accounts Payable And Accrued Expenses Debt [Abstract] Debt Disclosure [Text Block] Debt Warrants And Derivative Liabilities [Abstract] Derivative Instruments and Hedging Activities Disclosure [Text Block] Warrants And Derivative Liabilities 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]