Entity Central Index Key Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on financial instruments. Fair value of financial instruments. Document and entity information. Document And Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Statement Of Financial Position [Abstract] ASSETS Assets [Abstract] CURRENT ASSETS Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Short-term investments Short Term Investments Accounts receivable, less allowance for doubtful accounts of $864 and $763, respectively Accounts Receivable Net Current Deferred costs Deferred Costs Current Other current assets Other Assets Current Total current assets Assets Current PROPERTY AND EQUIPMENT, net Property Plant And Equipment Net GOODWILL Goodwill INTANGIBLE ASSETS, net Finite Lived Intangible Assets Net INVESTMENTS Marketable Securities Noncurrent OTHER ASSETS Other Assets Noncurrent [Abstract] Deferred costs Deferred Costs Deferred income tax asset Deferred Tax Assets Net Noncurrent Other assets Other Assets Noncurrent Total assets Assets LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities And Stockholders Equity [Abstract] CURRENT LIABILITIES Liabilities Current [Abstract] Accounts payable Accounts Payable Current Accrued compensation Employee Related Liabilities Current Accrued expenses Accrued Liabilities Current Deferred revenue Deferred Revenue Current Deferred rent Deferred Rent Credit Current Total current liabilities Liabilities Current OTHER LIABILITIES Other Liabilities Noncurrent [Abstract] Deferred revenue Deferred Revenue Noncurrent Deferred rent Deferred Rent Credit Noncurrent Deferred income tax liability Deferred Tax Liabilities Noncurrent Total liabilities Liabilities COMMITMENTS and CONTINGENCIES Commitments And Contingencies STOCKHOLDERS’ EQUITY Stockholders Equity [Abstract] Preferred stock, $0.001 par value; 5,000,000 shares authorized; 0 shares issued and outstanding Preferred Stock Value Common stock, $0.001 par value; 55,000,000 shares authorized; 17,475,360 and 17,249,153 shares issued; and 17,159,819 and 17,127,006 outstanding, respectively Common Stock Value Treasury stock, at cost; 315,541 and 122,147 shares, respectively Treasury Stock Value Additional paid-in capital Additional Paid In Capital Common Stock Retained earnings (accumulated deficit) Retained Earnings Accumulated Deficit Accumulated other comprehensive (loss) income Accumulated Other Comprehensive Income Loss Net Of Tax Total stockholders’ equity Stockholders Equity Total liabilities and stockholders’ equity Liabilities And Stockholders Equity Allowance for doubtful accounts Allowance For Doubtful Accounts Receivable Current Preferred stock, par value Preferred Stock Par Or Stated Value Per Share Preferred stock, shares authorized Preferred Stock Shares Authorized Preferred stock, shares issued Preferred Stock Shares Issued Preferred stock, shares outstanding Preferred Stock Shares Outstanding Common stock, par value Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Common stock, shares outstanding Common Stock Shares Outstanding Treasury stock, shares Treasury Stock Shares Income Statement [Abstract] Revenues Revenue From Contract With Customer Excluding Assessed Tax Cost of revenues Cost Of Revenue Gross profit Gross Profit Operating expenses Operating Expenses [Abstract] Sales and marketing Selling And Marketing Expense Research and development Research And Development Expense General and administrative General And Administrative Expense Amortization of intangible assets Amortization Of Intangible Assets Total operating expenses Operating Expenses Income from operations Operating Income Loss Other income (expense) Nonoperating Income Expense [Abstract] Interest income, net Interest Income Expense Net Other expense, net Other Nonoperating Income Expense Total other income, net Nonoperating Income Expense Income before income taxes Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Income tax expense Income Tax Expense Benefit Net income Net Income Loss Net income per share Earnings Per Share [Abstract] Basic Earnings Per Share Basic Diluted Earnings Per Share Diluted Weighted average common shares used to compute net income per share Weighted Average Number Of Shares Outstanding [Abstract] Basic Weighted Average Number Of Shares Outstanding Basic Diluted Weighted Average Number Of Diluted Shares Outstanding Other comprehensive income Other Comprehensive Income Loss Tax [Abstract] Foreign currency translation adjustments Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax Unrealized gain (loss) on investments, net of tax of $34, ($5), $47 and ($10) Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax Reclassification of unrealized gain on investments into earnings, net of tax of ($45), ($5), ($53) and ($15) Other Comprehensive Income Loss Reclassification Adjustment From A O C I For Sale Of Securities Net Of Tax Comprehensive income Comprehensive Income Net Of Tax Unrealized gain (loss) on investments, tax Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax Reclassification of unrealized gain on investments into earnings, tax Other Comprehensive Income Loss Reclassification Adjustment From A O C I For Sale Of Securities Tax The cash outflow associated with the acquisition of business and intangible assets, net of the cash acquired from the purchase. Statement Of Cash Flows [Abstract] Cash flows from operating activities Net Cash Provided By Used In Operating Activities [Abstract] Net income Reconciliation of net income to net cash provided by operating activities Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Deferred income taxes Deferred Income Tax Expense Benefit Depreciation and amortization of property and equipment Depreciation Depletion And Amortization Provision for doubtful accounts Provision For Doubtful Accounts Stock-based compensation Share Based Compensation Other, net Other Noncash Income Expense Changes in assets and liabilities Increase Decrease In Operating Capital [Abstract] Accounts receivable Increase Decrease In Accounts Receivable Deferred costs Increase Decrease In Deferred Charges Other current and non-current assets Increase Decrease In Other Operating Assets Accounts payable Increase Decrease In Accounts Payable Accrued compensation Increase Decrease In Employee Related Liabilities Accrued expenses Increase Decrease In Accrued Liabilities Deferred revenue Increase Decrease In Deferred Revenue Deferred rent Increase Decrease In Other Deferred Liability Net cash provided by operating activities Net Cash Provided By Used In Operating Activities Cash flows from investing activities Net Cash Provided By Used In Investing Activities [Abstract] Purchases of property and equipment Payments To Acquire Property Plant And Equipment Purchases of investments Payments To Acquire Other Investments Maturities of investments Proceeds From Sale And Maturity Of Available For Sale Securities Acquisitions of businesses and intangible assets, net of cash acquired Payments To Acquire Businesses And Intangible Assets Net Of Cash Acquired Net cash used in investing activities Net Cash Provided By Used In Investing Activities Cash flows from financing activities Net Cash Provided By Used In Financing Activities [Abstract] Repurchases of common stock Payments For Repurchase Of Common Stock Net proceeds from exercise of options to purchase common stock Proceeds From Stock Options Exercised Net proceeds from employee stock purchase plan Proceeds From Stock Plans Net cash (used in) provided by financing activities Net Cash Provided By Used In Financing Activities Effect of foreign currency exchange rate changes Effect Of Exchange Rate On Cash And Cash Equivalents Net increase in cash and cash equivalents Cash And Cash Equivalents Period Increase Decrease Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Organization Consolidation And Presentation Of Financial Statements [Abstract] General Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] Disclosure Text Block Supplement [Abstract] Financial Instruments Financial Instruments Disclosure [Text Block] Goodwill And Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets, net Goodwill And Intangible Assets Disclosure [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Stock-Based Compensation Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Net Income Per Share Earnings Per Share [Text Block] Basis of Presentation Basis Of Accounting Policy Policy [Text Block] Use of Estimates Use Of Estimates Recently Adopted Accounting Pronouncements New Accounting Pronouncements Policy Policy [Text Block] Accounting pronouncements not yet adopted. Accounting Pronouncements Not Yet Adopted Accounting Pronouncements Not Yet Adopted Policy [Text Block] Significant accounting policies. Significant Accounting Policies Significant Accounting Policies Policy [Text Block] Revenue Recognition Revenue Recognition Policy [Text Block] Deferred Costs Deferred Charges Policy [Text Block] Statement [Table] Statement [Table] Adjustments for New Accounting Pronouncements Adjustments For New Accounting Pronouncements [Axis] Type of Adoption Type Of Adoption [Member] ASU 2014-09 [Member] Accounting Standards Update201409 [Member] Statement [Line Items] Statement [Line Items] Adoption of Accounting Standard Changes on Financial Statements Schedule Of New Accounting Pronouncements And Changes In Accounting Principles [Text Block] Summary of Revenues by Revenue Stream Disaggregation Of Revenue Table [Text Block] Summary of Deferred Revenue Liability Relating to Set-Up Fees Deferred Revenue By Arrangement Disclosure [Text Block] Deferred costs and amortization. Summary of Deferred Costs and Amortization of Set-up Fees Deferred Costs And Amortization Table [Text Block] Tabular disclosure of the components of cash equivalents and other investments. Other investments may include, but are not limited to, current and noncurrent certificates of deposit and current and noncurrent debt and equity marketable securities. Financial Instruments Owned At Fair Value [Abstract] Summary of Cash Equivalents and Short and Long-term Investments Cash Equivalents And Other Investments Disclosure Table [Text Block] Summary of Financial Assets Measured at Fair Value on a Recurring Basis Fair Value Assets Measured On Recurring Basis [Text Block] Schedule of Changes in Net Carrying Amount of Goodwill Schedule Of Goodwill [Text Block] Intangible Assets Subject to Amortization Schedule Of Finite Lived Intangible Assets Table [Text Block] Estimated Annual Amortization Expense Related to Intangible Assets Subject to Amortization Scheduleof Finite Lived Intangible Assets Future Amortization Expense Table [Text Block] Future Minimum Payments Under Operating Leases Schedule Of Future Minimum Rental Payments For Operating Leases Table [Text Block] Award Type Award Type [Axis] Equity Award Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Restricted stock units and performance share units. Performance Share Units and Restricted Stock Units [Member] Restricted Stock Units And Performance Share Units [Member] Restricted Stock Award [Member] Restricted Stock [Member] Stock-Based Compensation Expense Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Text Block] Stock Option Activity Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] Weighted Average Grant Date Fair Value of Options Granted, Assumptions Schedule Of Share Based Payment Award Stock Options Valuation Assumptions Table [Text Block] Performance Share Units and Restricted Stock Units and Restricted Stock Awards Schedule Of Sharebased Compensation Restricted Stock And Restricted Stock Units Activity Table [Text Block] Fair Value Estimation of Common Stock Using Black-Scholes Option Pricing Model, Assumptions Schedule Of Share Based Payment Award Employee Stock Purchase Plan Valuation Assumptions Table [Text Block] Components of Computation of Basic and Diluted Net Income Per Share Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Initial Application Period Cumulative Effect Transition Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition Initial Application Period Cumulative Effect Transition [Domain] As Previously Reported [Member] Calculated Under Revenue Guidance In Effect Before Topic606 [Member] Adjustments [Member] Difference Between Revenue Guidance In Effect Before And After Topic606 [Member] Deferred costs, non-current Deferred income tax asset Deferred Tax Assets Liabilities Net Noncurrent LIABILITIES Liabilities [Abstract] Deferred revenue, non-current Accumulated deficit Income from operations Net cash provided by operating activities Net Regulatory Assets [Abstract] Revenue recognition. Revenue Recognition. Revenue Recognition [Table] Revenue Recognition [Table] Product and Service Product Or Service [Axis] Product and Service Products And Services [Domain] Fulfillment. Fulfillment [Member] Fulfillment [Member] One time revenues. One-time Revenues [Member] One Time Revenues [Member] Analytics. Analytics [Member] Analytics [Member] Other. Other [Member] Other [Member] Recurring revenues. Recurring Revenues [Member] Recurring Revenues [Member] Revenue Recognition [Line Items] Revenue Recognition [Line Items] Customer contract cancellation period. Recurring revenues timing of billings latest period. Recurring revenues timing of billings earliest period description. Regulatory Assets [Abstract] Regulatory Assets [Abstract] Schedule of accounting policies. Schedule Of Accounting Policies [Table] Schedule Of Accounting Policies [Table] Schedule Of Accounting Policies [Table] Range Range [Axis] Range Range [Member] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Analytics Platform [Member] Schedule Of Accounting Policies [Line Items] Schedule Of Accounting Policies [Line Items] Customer contract cancellation period Customer Contract Cancellation Period Earliest timing of billings Recurring Revenues Timing Of Billings Earliest Period Description Latest timing of billings Recurring Revenues Timing Of Billings Latest Period Deferred revenue recognition period. Contract period for remaining performance obligations for contracts in which the optional exemption under ASC 606-10-50-14(a) was applied. Deferred revenue recognition period Deferred Revenue Recognition Period Contract period for remaining performance obligations for contracts in which the optional exemption under ASC 606-10-50-14(a) was applied Revenue Remaining Performance Obligation For Contracts Original Durations Estimated connection life between customer and trading partner. Set up fees recognized period. Estimated connection life between customer and trading partner Estimated Connection Life Between Customer And Trading Partner Set up fees recognized period Set Up Fees Recognized Period Deferred revenue Invoiced set up fees. Deferred revenue amortized set up fees. Deferred Revenue [Abstract] Deferred Revenue Arrangement By Type [Table] Deferred Revenue Arrangement By Type [Table] Type of Arrangement and Non-arrangement Transactions Type Of Arrangement [Axis] Arrangements and Non-arrangement Transactions Arrangements And Nonarrangement Transactions [Member] Set up fees. Set-Up Fees [Member] Set Up Fees [Member] Deferred Revenue Arrangement [Line Items] Deferred Revenue Arrangement [Line Items] Balances, at beginning of period Deferred Revenue Invoiced set-up fees Deferred Revenue Invoiced Set Up Fees Amortized set-up fees Deferred Revenue Amortized Set Up Fees Balances, at end of period Current amount recognition period of set up fees. Long term amount recognition period of set up fees. Current amount recognition period of set up fees Current Amount Recognition Period Of Set Up Fees Long term amount recognition period of set up fees Long Term Amount Recognition Period Of Set Up Fees Maximum recognition period for miscellaneous one-time fee. Maximum recognition period for miscellaneous one-time fee Maximum Recognition Period For Miscellaneous One Time Fee Deferred commission expected amortization period. Deferred commission expected amortization period Deferred Commission Expected Amortization Period Deferred cost incurred set up fees. Deferred cost amortized set up fees. Deferred Costs [Abstract] Balances, at beginning of period Deferred Costs Current And Noncurrent Incurred deferred costs Deferred Cost Incurred Set Up Fees Amortized deferred costs Deferred Cost Amortized Set Up Fees Balances, at end of period Impairment loss in relation to costs capitalized Capitalized Contract Cost Impairment Loss Fair value of financial instruments maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. This item represents the cost of financial instruments, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. Fair value of financial instruments maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Investments Debt And Equity Securities [Abstract] Schedule of financial instruments. Schedule of financial instruments. Schedule of Available for sale Securities [Table] Schedule Of Financial Instruments [Table] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investment Type Categorization [Member] Financial instruments. Financial Instruments [Member] Financial Instruments [Member] Money Market Funds [Member] Money Market Funds [Member] Certificate of Deposit [Member] Certificates Of Deposit [Member] Corporate Bonds [Member] Corporate Debt Securities [Member] Commercial Paper [Member] Commercial Paper [Member] U.S. Treasury Securities [Member] U S Treasury Securities [Member] Schedule of Financial Instruments [Line Items] Schedule Of Financial Instruments [Line Items] Due within one year Financial Instruments Maturities Within One Year Fair Value Amortized Cost Financial Instrument Amortized Cost Basis Due within two years Financial Instruments Maturities After One Through Five Years Fair Value Unrealized Gains (Losses) Financial Instrument Gross Unrealized Gain Loss Before Tax Fair Value Financial Instruments Fair Value Cash And Cash Equivalents [Abstract] Fair Value, by Balance Sheet Grouping [Table] Fair Value By Balance Sheet Grouping [Table] Measurement Frequency [Axis] Fair Value By Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value Measurements Recurring [Member] Level 2 [Member] Fair Value By Fair Value Hierarchy Level [Axis] Fair Value Hierarchy [Domain] Fair Value Measurements Fair Value Hierarchy [Domain] Level 1 [Member] Fair Value Inputs Level1 [Member] Level 2 [Member] Fair Value Inputs Level2 [Member] Level 3 [Member] Fair Value Inputs Level3 [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] Assets fair value Assets Fair Value Disclosure Balances, January 1 Goodwill acquired during the period Goodwill Acquired During Period Foreign currency translation adjustments Goodwill Foreign Currency Translation Gain Loss Balances, June 30 Schedule of Finite Lived Intangible Assets [Table] Schedule Of Finite Lived Intangible Assets [Table] Finite-Lived Intangible Assets [Line Items] Finite Lived Intangible Assets [Line Items] Intangible assets useful life Finite Lived Intangible Asset Useful Life Finite Lived Intangible Assets by Major Class [Axis] Finite Lived Intangible Assets By Major Class [Axis] Finite Lived Intangible Assets, Major Class Name [Domain] Finite Lived Intangible Assets Major Class Name [Domain] Subscriber Relationships [Member] Customer Relationships [Member] Non-competition Agreements [Member] Noncompete Agreements [Member] Includes, but is not limited to, purchased developed software, developed technology, trademarks and tradenames.. Technology and Other [Member] Technology And Other [Member] Carrying Amount Finite Lived Intangible Assets Gross Accumulated Amortization Finite Lived Intangible Assets Accumulated Amortization Foreign Currency Translation Finite Lived Intangible Assets Foreign Currency Translation Gain Loss Net Amortization expense Remainder of 2018 Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year 2019 Finite Lived Intangible Assets Amortization Expense Year Two 2020 Finite Lived Intangible Assets Amortization Expense Year Three 2021 Finite Lived Intangible Assets Amortization Expense Year Four 2022 Finite Lived Intangible Assets Amortization Expense Year Five Thereafter Finite Lived Intangible Assets Amortization Expense After Year Five Net Remainder of 2018 Operating Leases Future Minimum Payments Remainder Of Fiscal Year 2019 Operating Leases Future Minimum Payments Due In Two Years 2020 Operating Leases Future Minimum Payments Due In Three Years 2021 Operating Leases Future Minimum Payments Due In Four Years 2022 Operating Leases Future Minimum Payments Due In Five Years Thereafter Operating Leases Future Minimum Payments Due Thereafter Operating leases, total Operating Leases Future Minimum Payments Due Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Equity Incentive Plan [Member] Stock Compensation Plan [Member] Award Type [Axis] Award Date [Axis] Equity Award [Domain] Award Date [Domain] Two thousand ten. 2010 [Member] Two Thousand Ten [Member] Stock Options [Member] Employee Stock Option [Member] Performance share units. Performance Share Unit [Member] Performance Share Units [Member] Restricted Stock Units [Member] Restricted Stock Units R S U [Member] Sale of Stock Subsidiary Sale Of Stock [Axis] Sale of Stock Sale Of Stock Name Of Transaction [Domain] Employee Stock Purchase Plan [Member] Employee Stock [Member] Four zero one (k) stock match. 401(k) Stock Match [Member] Four Zero One K Stock Match [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Additional shares reserved for issuance under the plan Deferred Compensation Arrangement With Individual Common Stock Reserved For Future Issuance Shares available for grant Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant Stock-based compensation expense Allocated Share Based Compensation Expense Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Income Statement Location Income Statement Location [Axis] Income Statement Location Income Statement Location [Domain] Cost of Revenues [Member] Cost Of Sales [Member] Sales and Marketing [Member] Selling And Marketing Expense [Member] Research and Development [Member] Research And Development Expense [Member] General and Administrative [Member] General And Administrative Expense [Member] Performance Share Unit [Member] Performance Shares [Member] Employee stock purchase plan. Employee Stock Purchase Plan Employee Stock Purchase Plan [Member] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Represents the expense (reversal of expense) during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Stock-based compensation expense (reversal of expense) Allocated Share Based Compensation Expense Reversal Unrecognized stock-based compensation expense Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Unrecognized stock-based compensation, expected to be recognized, weighted average period Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 Vesting period Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 Stock options contractual term range Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period Stock options contractual term, from the date of grant Share Based Compensation Arrangement By Share Based Payment Award Terms Of Award Options Outstanding, Beginning balance Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number Options, Granted Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross Options, Exercised Stock Issued During Period Shares Stock Options Exercised Options, Forfeited Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Options Outstanding, Ending balance Weighted Average Exercise Price, Outstanding, Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Weighted Average Exercise Price, Granted Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price Weighted Average Exercise Price, Exercised Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price Weighted Average Exercise Price, Forfeited Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price Weighted Average Exercise Price, Outstanding, Ending Balance Stock options exercisable Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number Weighted average exercise price Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price Weighted average remaining contractual life Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 Weighted average fair value per share of options granted Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value Volatility Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate Dividend yield Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate Life (in years) Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 Risk-free interest rate Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Restricted stock awards units vest over, period Share Based Compensation Arrangement By Share Based Payment Award Award Requisite Service Period1 Stock awards, Outstanding, Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Granted, stock units Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Vested, stock units Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Forfeited, stock units Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period Stock awards, Outstanding, Ending Balance Weighted average grant date fair value, Outstanding, Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value Granted, Weighted Average Grant Date Fair Value Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value Vested, Weighted Average Grant Date Fair Value Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value Forfeited, Weighted Average Grant Date Fair Value Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value Weighted average grant date fair value, Outstanding, Ending Balance Share based compensation arrangement by share based payment award equity instruments other than options vested and unissued in period. Number of RSU's vested and not issued during the period Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested And Unissued In Period Restricted common stock issued, stock awards Restrictions lapsed, stock awards Forfeited, stock awards Restricted common stock issued, Weighted Average Grant Date Fair Value Restrictions lapsed, Weighted Average Grant Date Fair Value Forfeited, Weighted Average Grant Date Fair Value The number of six-month offering periods during each calendar year. Purchase price as a percentage of fair market value Sharebased Compensation Arrangement By Sharebased Payment Award Purchase Price Of Common Stock Percent Number of offerings per year Number Of Offerings The amount withheld from employees participating in the plan. Amount withheld from employees Employee Stock Purchase Plan Employees Contribution Employee stock purchase plan, shares purchased Share Based Compensation Arrangement By Share Based Payment Award Shares Purchased For Award Volatility Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Maximum allowable contribution by employee percentage Defined Contribution Plan Maximum Annual Contributions Per Employee Percent Defined contribution plan employer matching contribution percent Defined Contribution Plan Employer Matching Contribution Percent Of Match Maximum annual contribution per employee, percent Defined Contribution Plan Employer Matching Contribution Percent Unrecognized tax benefits Unrecognized Tax Benefits Accrued interest or tax penalties Income Tax Examination Penalties And Interest Accrued Corporate federal income tax rate Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate Net income per share. Net Income Per Share [Abstract] Numerator Net Income Loss [Abstract] Denominator Weighted average common shares outstanding, basic Options to purchase common stock Incremental Common Shares Attributable To Share Based Payment Arrangements Restricted stock units Incremental Common Shares Attributable To Contingently Issuable Shares Employee stock purchase plan Incremental Common Shares Attributable To Equity Unit Purchase Agreements Weighted average common shares outstanding, diluted Antidilutive shares (in thousands) Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount