Document and Entity Information Statement [Table] Statement [Line Items] Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Current Reporting Status Entity Filer Category Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Consolidated Balance Sheets Assets [Abstract] Assets Assets, Current [Abstract] Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Cash and cash equivalents Accounts Receivable, Net, Current Trade accounts receivable, net of allowance for doubtful accounts of $522 and $532 at June 30, 2014 and March 31, 2014, respectively Costs in Excess of Billings, Current Costs and estimated earnings in excess of billings on uncompleted contracts Inventory, Net Inventories Total inventories Deferred Tax Assets, Net of Valuation Allowance, Current Deferred income taxes Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Assets, Current Total current assets Property, Plant and Equipment, Net Property and equipment, net Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Deferred income taxes Finite-Lived Intangible Assets, Net Intangible assets, net Total Goodwill Goodwill Other Assets, Noncurrent Other assets Assets Total assets Liabilities and Equity [Abstract] Liabilities and stockholders' equity Liabilities, Current [Abstract] Current liabilities: Accounts Payable, Trade, Current Trade accounts payable Employee-related Liabilities, Current Accrued payroll and related expenses Accrued Liabilities, Current Accrued liabilities Billings in Excess of Cost Billings in excess of costs and estimated earnings on uncompleted contracts Liabilities, Current Total current liabilities Deferred Rent Credit, Noncurrent Deferred rent Liability for Uncertain Tax Positions, Noncurrent Unrecognized tax benefits Liabilities Total liabilities Commitments and Contingencies Commitments and contingencies Stockholders' Equity Attributable to Parent [Abstract] Stockholders' equity: Preferred Stock, Value, Issued Preferred stock, $1.00 par value: Authorized shares - 2,000 Issued and outstanding shares - none Common Stock, Value, Issued Common stock, $0.10 par value: Authorized shares - 70,000 at June 30, 2014 and March 31, 2014, Issued and outstanding shares - 32,611 at June 30, 2014 and 32,788 at March 31, 2014 Additional Paid in Capital, Common Stock Additional paid-in capital Retained Earnings (Accumulated Deficit) Accumulated deficit Stockholders' Equity Attributable to Parent Total stockholders' equity Liabilities and Equity Total liabilities and stockholders' equity Allowance for Doubtful Accounts Receivable, Current Trade accounts receivable, allowance for doubtful accounts (in dollars) Preferred Stock, Par or Stated Value Per Share Preferred stock, par value (in dollars per share) Preferred Stock, Shares Authorized Preferred stock, Authorized shares Preferred Stock, Shares Issued Preferred stock, Issued shares Preferred Stock, Shares Outstanding Preferred stock, outstanding shares Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock, Shares Authorized Common stock, Authorized shares Common Stock, Shares, Issued Common stock, Issued shares Common Stock, Shares, Outstanding Common stock, outstanding shares Consolidated Statements of Operations Revenues Total revenues Cost of Revenue Cost of revenues Gross Profit Gross profit Operating Expenses [Abstract] Operating expenses: Selling, General and Administrative Expense Selling, general and administrative Research and Development Expense Research and development The aggregate expense charged against earnings to allocate the cost of intangible assets excluding capitalized software development costs and acquired data sets in a systematic and rational manner to the periods expected to benefit from such assets. Amortization Of Intangible Assets Less Capitalized Software Development Costs And Acquired Data Sets Amortization of intangible assets Amortization of intangible assets Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Change in fair value of contingent consideration Change in fair value of contingent consideration Operating Expenses Total operating expenses Operating Income (Loss) Segment operating income (loss) Segment operating income (loss) Operating (loss) income Nonoperating Income (Expense) [Abstract] Non-operating (expense) income: Other Nonoperating Income (Expense) Other (expense), net Interest Income (Expense), Nonoperating, Net Interest income (expense), net Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest (Loss) income from continuing operations before income taxes Income Tax Expense (Benefit) Benefit (provision) for income taxes Benefit (provision) for income taxes Income (Loss) from Continuing Operations Attributable to Parent (Loss) income from continuing operations Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Gain on sale of discontinued operation, net of tax Gain on sale of discontinued operation, net of tax Net Income (Loss) Available to Common Stockholders, Basic Net (loss) income Net (loss) income Income (Loss) from Continuing Operations, Per Basic and Diluted Share (Loss) income per share from continuing operations - basic and diluted Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Per Basic and Diluted Share Gain per share from sale of discontinued operation - basic and diluted (in dollars per share) Earnings Per Share, Basic and Diluted Net (loss) income per share - basic and diluted Weighted Average Number of Shares Outstanding, Basic Shares used in basic per share calculations (in shares) Weighted average common shares used in basic per share computation Weighted Average Number of Shares Outstanding, Diluted Shares used in diluted per share calculations (in shares) Weighted average common shares used in diluted per share computation Consolidated Statements of Cash Flows Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Changes in operating assets and liabilities, net of effects of discontinued operation: Deferred Income Tax Expense (Benefit) Deferred income taxes Depreciation Depreciation of property and equipment Share-based Compensation Stock-based compensation Amortization of Intangible Assets Amortization of intangible assets Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable The net change during the reporting period in amount due to billings on long term contracts that exceed the income recorded under the percentage of completion contract accounting method, or that exceed the accumulated costs under the completed contract accounting method. Increase (Decrease) in Net Costs and Estimated Earnings in Excess of Billings Net costs and estimated earnings in excess of billings Increase (Decrease) in Inventories Inventories Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other assets Increase (Decrease) in Accounts Payable and Accrued Liabilities Accounts payable and accrued expenses Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment Payments to Acquire Software Capitalized software Proceeds from Divestiture of Businesses Cash proceeds from sale of assets Net proceeds from sale of business segment Net Cash Provided by (Used in) Investing Activities Net cash (used in) investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities Payments for Repurchase of Common Stock Repurchases of common stock Proceeds from Stock Options Exercised Proceeds from stock option exercises Net Cash Provided by (Used in) Financing Activities Net cash used in financing activities Cash and Cash Equivalents, Period Increase (Decrease) Increase (decrease) in cash and cash equivalents Description of Business and Summary of Significant Accounting Policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Description of Business and Summary of Significant Accounting Policies No definition available. Supplemental Financial Information Additional Financial Information Disclosure [Text Block] Supplemental Financial Information Sale of Vehicle Sensors Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Sale of Vehicle Sensors Fair Value Measurements Fair Value Disclosures [Text Block] Fair Value Measurements Credit Facility Debt Disclosure [Text Block] Credit Facility Income Taxes Income Tax Disclosure [Text Block] Income Taxes Commitments and Contingencies. Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock-Based Compensation Stock Repurchase Program Treasury Stock [Text Block] Stock Repurchase Program Business Segment Information Segment Reporting Disclosure [Text Block] Business Segment Information Basis of Accounting, Policy [Policy Text Block] Basis of Presentation Reclassification, Policy [Policy Text Block] Reclassification Use of Estimates, Policy [Policy Text Block] Use of Estimates Revenue Recognition, Policy [Policy Text Block] Revenue Recognition Disclosure of accounting policy of cost of uncompleted contracts in excess of related billings or unbilled accounts receivable. Costs in Excess of Billings on Uncompleted Contracts or Programs [Policy Text Block] Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts Disclosure of accounting policy for billings in excess of costs and estimated earnings on uncompleted contracts. Billings in Excess of Costs and Estimated Earnings on Uncompleted Contracts [Policy Text Block] Billings in Excess of Costs and Estimated Earnings on Uncompleted Contracts Concentration Risk, Credit Risk, Policy [Policy Text Block] Concentration of Credit Risk Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Values of Financial Instruments Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Other Current Assets [Text Block] Prepaid Expenses and Other Current Assets Trade and Other Accounts Receivable, Policy [Policy Text Block] Allowance for Doubtful Accounts Inventory, Policy [Policy Text Block] Inventories Property, Plant and Equipment, Policy [Policy Text Block] Property and Equipment Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block] Goodwill and Long-Lived Assets Income Tax, Policy [Policy Text Block] Income Taxes Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Stock-Based Compensation Research and Development Expense, Policy [Policy Text Block] Research and Development Expenditures Shipping and Handling Cost, Policy [Policy Text Block] Shipping and Handling Costs Disclosure of accounting policy for presentation of sales taxes. Sales Taxes [Policy Text Block] Sales Taxes Standard Product Warranty, Policy [Policy Text Block] Warranty Disclosure of the accounting policy for repair and maintenance costs. Repairs and Maintenance Cost [Policy Text Block] Repair and Maintenance Costs New Accounting Pronouncements, Policy [Policy Text Block] Recent Accounting Pronouncements Schedule of Inventory, Current [Table Text Block] Schedule of inventories Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of intangible assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of future estimated amortization expense Schedule of Product Warranty Liability [Table Text Block] Schedule of warranty reserve activity Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of computation of basic and diluted income (loss) per share from continuing operations Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of instruments excluded in the computation of diluted income from continuing operations per share Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Schedule of reconciliation of liability measured at fair value on a recurring basis Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of provision for income taxes and effective tax rates Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Summary of activity with respect to stock options Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Summary of activity with respect to RSUs Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Schedule of stock-based compensation expense Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of selected unaudited consolidated financial information for reportable segments Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Schedule of reconciliation of total segment income to unaudited consolidated income from continuing operations before income taxes The table contains disclosure pertaining to an entity's significant accounting policies. Significant Accounting Policies [Table] Range [Axis] Range [Member] Range [Domain] Maximum [Member] Maximum Minimum [Member] Minimum Property, Plant and Equipment, Type [Axis] Property Plant And Equipment Type [Domain] Property, Plant and Equipment, Type [Domain] Machinery And Equipment [Member] Property and equipment Significant Accounting Policies [Line Items] Significant accounting policies Costs in Excess of Billings on Uncompleted Contracts or Programs [Abstract] Costs in Excess of Billings on Uncompleted Contracts Represents the period of time that unbilled amounts are expected to be billed and collected by the entity. Period Unbilled Amounts Expected to be Billed and Collected Expected period for unbilled amounts to be billed and collected Billings in Excess of Cost [Abstract] Billings in Excess of Costs and Estimated Earnings on Uncompleted Contracts Represents the period of time that unearned amounts are expected to be earned by the entity. Period Unearned Amounts Expected to be Earned Expected period for unearned amounts to be earned Property, Plant and Equipment [Abstract] Property and Equipment Property, Plant and Equipment, Useful Life Useful life Product Warranties Disclosures [Abstract] Warranty Warranty Reserve Activity Represents the warranty period from the original invoice date on all products, materials and workmanship generally provided by the entity. Warranty Period Warranty period Prepaid Expense and Other Assets, Current [Abstract] Other Prepaid Expense, Current Prepaid expenses and other current assets Prior Period Reclassification Adjustment Cash and Cash Equivalents [Abstract] Cash and Cash Equivalents Restricted Cash and Investments, Noncurrent Cash designated as collateral on performance bonds Represents the percentage of cash value of the bonds as collateral on performance bonds. Percentage of Cash Value of Bond as Collateral on Performance Bonds Percentage of cash value of the bonds as collateral Inventory, Net [Abstract] Inventories Inventory, Raw Materials and Supplies, Net of Reserves Materials and supplies Inventory, Work in Process, Net of Reserves Work in process Inventory, Finished Goods, Net of Reserves Finished goods Property, Plant and Equipment [Table] Property, Plant and Equipment [Line Items] Property and Equipment Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite Lived Intangible Assets Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Developed Technology Rights [Member] Technology Represents an asset acquired in a business combination representing the entity's established relationships with its customers through contracts and an asset acquired in a business combination representing a customer relationship that exists between the entity and its customer. Customer Contracts And Relationship [Member] Customer contracts / relationships Represents the rights acquired through registration of a business name to gain or protect exclusive use thereof and also represents the agreement in which one party agrees not to pursue a similar trade in competition with another party. Trade Names And Noncompete Agreements [Member] Trade names and non-compete agreements Software And Software Development Costs [Member] Capitalized software development costs Finite-Lived Intangible Assets [Line Items] Intangible Assets Finite-Lived Intangible Assets, Gross Gross Carrying Amount Finite-Lived Intangible Assets, Accumulated Amortization Accumulated Amortization Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Future estimated amortization expense Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year Remainder of 2015 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Five 2019 Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward] Activity related to warranty reserve Product Warranty Accrual Balance at end of period Balance at beginning of period Product Warranty Accrual, Warranties Issued Addition charged to cost of revenues Product Warranty Accrual, Payments Warranty claims Tabular disclosure pertaining to an entity's dilutive securities. Schedule of Earnings Per Share [Table] Award Type [Axis] Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Equity Award [Domain] An arrangement whereby an employee or non-employee is entitled to receive in the future, subject to vesting and other restrictions, a number of shares in the entity at a specified price, as defined in the agreement. Although there are variations, normally, after vesting, when an option is exercised, the employee-holder pays the strike value in cash to the issuing employer-entity and receives equity shares. The equity shares can be sold into the market for cash at the current market price without restriction. Options may be used to attract, retain and incentivize employees, in addition to their regular salary and other benefits. Employee And Non Employees Stock Option [Member] Stock options Restricted Stock Units R S U [Member] Restricted Stock Units (RSUs) Earnings Per Share [Line Items] Earnings per share Weighted Average Number of Shares Outstanding, Diluted [Abstract] Denominator: Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Dilutive (in shares) Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants Dilutive warrants (in shares) Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities Name [Domain] Antidilutive Securities, Name [Domain] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Shares excluded in the computation of income from continuing operations per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Shares excluded in the computation of income from continuing operations per share Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Table] Disposal Group Name [Axis] Disposal Groups Including Discontinued Operations Name [Domain] Disposal Groups, Including Discontinued Operations, Name [Domain] Represents information pertaining to the Vehicle Sensors segment. Vehicle Sensors [Member] Vehicle Sensors segment Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Sale of Vehicle Sensors The cash inflow associated with the amount received during the period from the sale of a portion of the company's business before offsetting legal and other professional fees directly related to the sale transaction. Proceeds from Divestiture of Businesses Gross Aggregate proceeds received on sale Represents the amount holdback at the time of sale of discontinued operation. Disposal Group Including Discontinued Operation Heldback Amount Holdback amount Represents the percentage of revenue associated with royalties under license and distribution agreements for calculation of additional cash consideration. Additional Cash Consideration Calculation Percentage of Revenue Associated with Royalties under License and Distribution Agreements Additional cash consideration, percentage of revenue associated with royalties Represents the percentage on excess of revenue over the projected revenue for calculation of additional cash consideration. Additional Cash Consideration Calculation Percentage on Excess of Revenue over Projected Revenue Additional cash consideration, percentage on excess of revenue over projected revenue Represents the period of excess of revenue over projected revenue for additional cash consideration calculation. Additional Cash Consideration Calculation Period of Excess of Revenue over Projected Revenue Additional cash consideration, period for which revenue generated exceeds target revenue Royalty Revenue Amount of earn-outs in connection with royalty Represents the number of operating segments that qualify as a discontinued operation. Number of Discontinued Operation Business Segment Number of discontinued operations business segments Represents the consideration received from the sale of segment, which is subject to holdback and adjustments based upon the working capital of segment. Disposal Group Including Discontinued Operation Consideration Received Subject to Certain Adjustments Cash received pursuant to resolution of the holdback provision Disposal Group, Including Discontinued Operation, Additional Disclosures [Abstract] Sale of Vehicle Sensors, additional disclosures Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair value measurements Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Reconciliation of liability measured at fair value Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value Balance at the end of the period Balance at the beginning of the period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Change in fair value included in net income Liabilities, Fair Value Disclosure [Abstract] Fair value disclosure of liabilities Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High Current portions of contingent consideration included within accrued liabilities Asset Impairment Charges [Abstract] Non-financial assets measured at fair value Impairment of Long-Lived Assets Held-for-use Non-financial assets measured at fair value Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Longterm Debt Type [Domain] Long-term Debt, Type [Domain] Information pertaining to the entity's credit facility. Credit Facility [Member] Credit facility Revolving Credit Facility [Member] Revolving Line of Credit Notes Payable To Banks [Member] Bank Term Note Debt Instrument [Line Items] Revolving Line of Credit Line of Credit Facility, Maximum Borrowing Capacity Maximum borrowing capacity Debt Instrument, Term Term of debt instrument Debt Instrument, Face Amount Principal amount Line of Credit Facility, Interest Rate at Period End Prime rate at the end of the period (as a percent) Debt Instrument, Description of Variable Rate Basis Monthly interest rate basis Debt Instrument, Basis Spread on Variable Rate Basis points added to reference rate (as a percent) Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Unused line fee (as a percent) Line of Credit Facility, Amount Outstanding Amount outstanding Represents the maximum number of days the entity has to file its Form 10-K with the Securities and Exchange Commission. Maximum Number Of Days Allowed To File With SEC Maximum number of days allowed to file with the SEC Effective Income Tax Rate Reconciliation, Percent Effective tax rate (as a percent) Deferred Tax Assets, Valuation Allowance Valuation allowance on deferred tax assets Schedule of Related Party Transactions, by Related Party [Table] Related Party [Axis] Related Party [Domain] Related Party [Domain] Represents information pertaining to Maxxess Systems Inc. M A Xxess Systems Inc [Member] Maxxess Related Party Transaction [Line Items] Related Party Transaction Represents the number of current directors of the entity who are included in an investor group, which owns the related party of the entity. Related Party Number of Current Directors Included in Investor Group Number of current directors included in investor group Represents the number of former directors of the entity who are included in an investor group, which owns the related party of the entity. Related Party Number of Former Directors Included in Investor Group Number of former directors included in investor group Due from Related Parties Promissory note payable issued to reporting entity for amounts previously owed under a sublease agreement Related Party Transaction, Rate Interest on promissory note (as a percent) Gross proceeds from financing obtain by the related party other than the entity that will trigger all amounts outstanding under the note was to become due and payable. Proceeds to Related Party Financing Other than Entity Gross proceeds from financing by related party Represents the number of stock incentive plans currently administered by the entity. Share Based Compensation Number of Stock Incentive Plans Number of stock incentive plans Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Represents information pertaining to the 2007 Omnibus Incentive Plan. Omnibus Incentive Plan2007 [Member] 2007 Plan Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Employee Benefit Plans Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Shares of common stock available for grant Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Options outstanding at the end of the period (in shares) Options outstanding at the beginning of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Weighted Average Exercise Price Per Share Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Options outstanding at the end of the period (in dollars per share) Options outstanding at the beginning of the period (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Forfeited (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Expired (in dollars per share) Represents the number of shares of common stock which the holder is entitled to receive for each RSU upon vesting. Number of Common Shares Issued for Each Restricted Stock Unit Vested Number of shares of common stock receivable upon vesting of each RSU Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Restricted stock units outstanding at the end of the period (in shares) Restricted stock units outstanding at the beginning of the period (in shares) Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Cost Of Sales [Member] Cost of revenues Selling General And Administrative Expenses [Member] Selling, general and administrative Research And Development Expense [Member] Research and development Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Stock-Based Compensation Allocated Share-based Compensation Expense Stock-based compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Unrecognized compensation expense related to unvested stock options Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Unrecognized compensation expense related to unvested RSUs Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Weighted average period over which compensation expense is expected to be recognized Class of Treasury Stock [Table] Equity, Class of Treasury Stock [Line Items] Stock Repurchase Program Stock Repurchase Program, Authorized Amount Value of common stock approved under stock repurchase program Stock Repurchased and Retired During Period, Shares Number of shares of common stock repurchased Stock Repurchased and Retired During Period, Value Value of common stock repurchased Treasury Stock Acquired, Average Cost Per Share Average price per share of common stock repurchased (in dollars per share) Stock Repurchase Program, Remaining Authorized Repurchase Amount Value of common stock available for repurchase under current program Number of Reportable Segments Number of reportable segments Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments [Member] Operating segments Segments [Axis] Segment [Domain] Segments [Domain] Represents the reportable segment of the entity, Roadway Sensors. Roadway Sensors [Member] Roadway Sensors Represents the reportable segment of the entity, Transportation Systems. Transportation Systems [Member] Transportation Systems Represents the reportable segment of the entity, iPerform. I Perform [Member] iPerform Segment Reporting Information [Line Items] Business Segments Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Corporate and reconciling items. Corporate And Reconciling Items [Member] Unallocated amounts Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] Business Segments Represents the amount of unallocated corporate and other expenses. Corporate and Other Expenses Corporate and other expenses Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Represent activity under the August 2011 stock repurchase program. August2011 Program [Member] August 2011 Program