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Total purchase commitments Purchase Obligation 2014 Purchase Obligation, Due in Second Year 2016 Purchase Obligation, Due in Fourth Year Commitments to purchase inventory and other items [Abstract] 2015 Purchase Obligation, Due in Third Year 2017 Purchase Obligation, Due in Fifth Year Selected Quarterly Consolidated Financial Data (unaudited) Quarterly Financial Information [Text Block] Range [Axis] Range [Domain] Real Estate Properties [Domain] Real Estate Property Ownership [Axis] Real Estate Properties [Line Items] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Payments on revolving line of credit Repayments of Lines of Credit Research and development Research Tax Credit Carryforward [Member] Research and Development Expense [Member] Money-market funds Restricted (non-vested) Shares [Member] Restricted stock awards [Member] Restricted Stock [Member] Restricted cash Restricted Stock or Unit Expense Accumulated deficit Accumulated Deficit [Member] Retained Earnings [Member] Revenue Recognition [Abstract] Revenue Recognition Revenues from External Customers and Long-Lived Assets [Line Items] Revenues Revolving Line of Credit [Member] Weighted average exercise price of shares outstanding (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price Weighted average exercise price of shares exercisable (in dollars per share) Weighted average contractual term of shares vested and expected to vest at end of the period Weighted average expected life in years Weighted average contractual term of shares exercisable at the end of the period Weighted average contractual term of shares outstanding Average remaining contractual life of shares outstanding Geographic Information [Abstract] Purchase price per share (in dollars per share) Product revenue Total revenue Total revenue Revenues: Service and other 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Period Costs, by Report Line [Axis] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Details of stock-based compensation Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Guarantor Obligations [Table] Summary of options outstanding and exercisable Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Property and Equipment [Table] Schedule of Property, Plant and Equipment [Table] Customer concentration risk revenue percentages Americas [Member] Segment, Geographical, Groups of Countries, Group One [Member] EMEA [Member] Segment, Geographical, Groups of Countries, Group Two [Member] Segment Reporting Segment, Geographical [Domain] Selected Quarterly Consolidated Financial Data (unaudited) [Abstract] Selling and marketing Selling and Marketing Expense [Member] 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Equity Stockholders' Equity Note Disclosure [Text Block] Current deferred tax liabilities [Abstract] Supplemental Cash Flow Information: Tax credit carryforwards Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward [Line Items] Tax Credit Carryforward [Axis] Tax Credit Carryforward [Table] Property, income, state, sales and franchise tax Title of Individual with Relationship to Entity [Domain] Translation gain on subsidiaries in foreign currencies Translation Adjustment Functional to Reporting Currency, Loss (Gain), Reclassified to Earnings, Net of Tax Treasury stock, at cost; 33 and 26 shares in 2012 and 2011, respectively Treasury Stock, Value Treasury stock, at cost (in shares) Treasury Stock [Member] Additions based on tax positions related to the current year Balance at beginning of period Balance at end of period Unrecognized Tax Benefits Additions for tax positions of prior years Reductions for tax positions of prior years Settlements Use of Estimates Valuation Allowance by Deferred Tax Asset [Axis] Change in valuation allowance Valuation Allowance [Line Items] Valuation allowance Valuation Allowance [Table] Weighted-average shares of common stock outstanding used in computing basic and diluted net loss per share (in shares) Shares used in computing net loss per share, basic and diluted (in shares) The name of the lender, which may be a single entity (for example, a bank, pension fund, venture capital firm) or a group of entities that participate in the line of credit, including a letter of credit facility. Silicon Valley Bank [Member] SVB [Member] Maximum delivery period for EMAs, consumables, and repair, maintenance or consulting services. Delivery period for EMAs, consumables, and repair, maintenance or consulting services, maximum Tabular disclosure of the carrying value and depreciation of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. Schedule Property Plant And Equipment [Table Text Block] Summary of property and equipment Number of foreign countries represents location of customers from which revenue derived. Number Of Foreign Countries Revenue Derived Number of foreign countries from which revenue derived Additional stock based compensation expense associated with termination of employee. Additional stock based compensation expense associated with termination of employee Additional stock based compensation expense associated with termination of Chief Executive Officer Disclosure of accounting policy for accrued expenses. Accrued Expenses [Policy Text Block] Accrued Expenses The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to expiration of net operating losses under enacted tax laws. Effective Income Tax Rate Reconciliation, Expiration of net operating losses Expiration of net operating losses (in hundredths) The increase in rate on finance charges or interest rates, as applicable, in the event of default. Increase in rate on finance charges or interest rates, as applicable, in the event of default Increase in rate on finance charges or interest rates, as applicable, in the event of default (in hundredths) The minimum required liquidity ratio under the existing debt covenant. Minimum liquidity ratio requirement The duration period (based on purchase orders) on the repayment of advances together with all finance charges. Duration period on the repayment of advances Repayment terms on purchase orders borrowings The increase in rate on collateral handling fees in the event of default. Increase in rate on collateral handling fees in the event of default Increase in rate on collateral handling fees in the event of default (in hundredths) The minimum duration period to maintain cash and cash equivalents under new two-year loan facility. Minimum duration period to maintain cash and cash equivalents The percentage of facility available under the new two-year loan facility. Percentage of facility available under new two year loan facility Aggregate percentage of the facility provision available during the "Streamline Period" (in hundredths) The length of the agreement on the revolving credit facility. Loan facility term The name of the lender, which may be a single entity (for example, a bank, pension fund, venture capital firm) or a group of entities that participate in the line of credit, including a letter of credit facility. Silicon Valley Bank non Streamline Period [Member] SVB non Streamline Period [Member] The name of the lender, which may be a single entity (for example, a bank, pension fund, venture capital firm) or a group of entities that participate in the line of credit, including a letter of credit facility. Silicon Valley Bank Streamline period [Member] SVB Streamline Period [Member] The name of the the type of rate added to the Prime rate Accounts receivable and inventory rates [Member] Accounts Receivable and Inventory Borrowing Rates [Member] The name of the the type of rate added to the Prime rate Purchase order rates [Member] Purchase Order Borrowing Rates [Member] Amended arrangement in which loan proceeds can continuously be obtained following repayments, but the total amount borrowed cannot exceed a specified maximum amount. Amended and Restated Loan and Security Agreement [Member] Valuation allowance type. Tax benefits for stock option deductions [Member] Tax Benefits for Stock Option Deductions [Member] The amount of current assets less current liabilities during the period. Working capital Disclosure of accounting policy for allowance for doubtful accounts for trade receivables, impairments, charge-offs or recoveries recognition. The policy include factors that influence management's establishment of the level of the allowance (for example, historical losses and existing economic conditions) and may also include discussion of the risk elements relevant to particular categories of receivables. Trade Receivables, Allowance for Doubtful Accounts, Policy [Policy Text Block] Allowance for Doubtful Accounts A third specified group of foreign countries about which segment information is provided by the entity. Segment Geographical Groups Of Countries Group Three [Member] Asia [Member] Severance Benefits Agreements [Abstract] The duration period of payment of salary and health benefits after termination related to the Severance Benefits Agreements. Duration period of payment of salary and health benefits after termination Duration period of payment of salary and health benefits after termination The duration period in the change in the executive officer's employment related to the Severance Benefits Agreements. Duration period in change in executive officer's employment The category or type of ownership of real estate properties. Expansion of our manufacturing facility [Member] The category or type of ownership of real estate properties. Administration, marketing and engineering [Member] The category or type of ownership of real estate properties. Sublease [Member] Subleased to third party [Member] The category or type of ownership of real estate properties. Administrative, information systems, manufacturing, sales and service groups [Member] Share based compensation exercise price range. Exercise range 10 [Member] $25.85 - $25.85 [Member] The minimum amount of restricted cash and cash equivalents required to be maintained under credit facility. Minimum restricted cash and cash equivalents Minimum restricted cash and cash equivalents required for the facility Amount of additional borrowing base under the credit facility. Line of Credit Facility, Additional Borrowing Base Additional borrowing base Number of private placement stocks issued under a shelf registration statement filed with the Securities and Exchange Commission. Stock Issued During Period, Shares, Private Placement Sale of common stock, net of issuance costs (in shares) Share based compensation exercise price range. Exercise range 9 [Member] $18.55 - $25.40 [Member] Share based compensation exercise price range. Exercise range 8 [Member] $11.45 - $18.50 [Member] Share based compensation exercise price range. Exercise range 7 [Member] $8.55 - $11.25 [Member] The average expected forfeitures rate assumption that is used in valuing an option on its own shares. Average expected forfeitures Average expected forfeitures (in hundredths) Share based compensation exercise price range. Exercise range 6 [Member] $4.25 - $8.45 [Member] Share based compensation exercise price range. Exercise range 5 [Member] $4.00 - $4.05 [Member] Share based compensation exercise price range. Exercise range 4 [Member] $3.95 - $3.95 [Member] Share based compensation exercise price range. Exercise range 3 [Member] $3.75 - $3.90 [Member] Share based compensation exercise price range. Exercise range 2 [Member] $3.45 - $3.60 [Member] Share based compensation exercise price range. Exercise range 1 [Member] $2.05 - $3.30 [Member] Equity impact of the value of private placement stock offering under a shelf registration statement filed with the Securities and Exchange Commission. Stock Issued During Period, Value, Private Placement Sale of common stock, net of issuance costs The percentage of vesting during the third anniversary of the grant date. Vesting percentage in period three Vesting percentage in year three (in hundredths) The percentage of vesting during the second anniversary of the grant date. Vesting percentage in period two Vesting percentage in year two (in hundredths) The percentage of vesting during the first anniversary of the grant date. Vesting percentage in period one Vesting percentage in year one (in hundredths) The limitation of amount in one or more offerings under the shelf registration. Dollar limitation of shelf registration The name of the equity-based compensation arrangement plan. 2000 and 2010 Stock Incentive Plans [Member] Type of share based compensation Unvested stock options [Member] Name of a single external customer that accounts for 10 percent or more of the entity's revenues Net Powersafe SA [Member] Advertising Costs [Abstract] Name of a single external customer that accounts for 10 percent or more of the entity's revenues European based customer [Member] European Based Customer [Member] Name of a single external customer that accounts for 10 percent or more of the entity's revenues United States based IT Customer [Member] United States Based IT Customer [Member] Name of a single external customer that accounts for 10 percent or more of the entity's revenues Hewlett Packard [Member] Name of a single external customer that accounts for 10 percent or more of the entity's revenues Caterpillar [Member] Economic Dependence [Abstract] Primary financial statement caption in which reported facts about cost of service and other income have been included. Cost of service and other revenue [Member] Stock-Based Compensation Expense [Abstract] The carrying amount, as of the balance sheet date, of noncurrent obligations related to technology licensing agreement. Technology licensing agreement Long-Term Liabilities [Abstract] Warranty Liability [Abstract] Allowance for Doubtful Accounts [Abstract] Minimum delivery period for EMAs, consumables, and repair, maintenance or consulting services. Delivery period for EMAs, consumables, and repair, maintenance or consulting services, minimum The duration period of product delivery related to certain services on design and consultation. Duration period of product delivery related to certain services on design and consultation Tabular disclosure of long term liabilities. Long term Liabilities [Table Text Block] Summary of long term liabilities Disclosure of accounting policy related to economic dependence. Economic Dependence [Policy Text Block] Economic Dependence Disclosure of accounting policy for long term liabilities Long Term Liabilities [Policy Text Block] Long-Term Liabilities Disclosure of accounting policy and treatment for Patent application costs. Patent Application Costs [Policy Text Block] Patent Application Costs Disclosure about revenues (1) attributed to the entity's country of domicile and (2) attributed to all regions in total from which the entity derives revenues, and disclosure about the locations of operating assets. Geographic Information [Text Block] Geographic Information Interest related to total debt, bank fees and issuance fees, less interest income. Interest Expense Net Interest expense, net Document and Entity Information [Abstract] The name of the equity-based compensation arrangement plan. Shares Added to 2010 Stock Incentive Plan [Member] Contract that gives the holder the right, but not the obligation, either to purchase or to sell a certain number of shares of stock at a predetermined price for a specified period of time. Also includes shares that an entity has not yet issued because the agreed-upon consideration, such as employee services, has not yet been received. Stock Options and Restricted Stock [Member] Maximum borrowing limit under the credit facility agreement related to eligible purchase orders. Borrowing base sublimits, Purchase orders Maximum borrowing limit under the credit facility agreement related to eligible inventory. Borrowing base sublimits, Inventory Maximum borrowing limit under the credit facility agreement related to eligible U.K. accounts receivable. Borrowing base sublimits, U.K. accounts receivable Identification of the the type of rate added to the Prime rate. 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