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. Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to permanent book versus tax differences. Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in state deferred tax rates. Tax cuts and jobs act of 2017 change in tax rate income tax expense (benefit). Income tax reconciliation, tax benefits for excess tax deduction from stock activity. Document and Entity Information [Abstract] 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 Well-known Seasoned Issuer Entity Well Known Seasoned Issuer Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Entity Public Float Entity Public Float 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, net 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; 17,249,153 and 17,081,145 shares issued; and 17,127,006 and 17,081,145 outstanding, respectively Common Stock Value Treasury stock, at cost; 122,147 and 0 shares, respectively Treasury Stock Value Additional paid-in capital Additional Paid In Capital Common Stock Accumulated deficit Retained Earnings Accumulated Deficit Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income Loss Net Of Tax Total stockholders’ equity Stockholders Equity Total liabilities and stockholders’ equity Liabilities And Stockholders Equity 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 Revenues 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 income (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 (loss) income Net Income Loss Net (loss) 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 (loss) 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 loss on investments, net of tax of $0, $5 and $31 Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax Reclassification of unrealized loss on investments into earnings, net of tax of $24, $0 and $0 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 loss on investments, tax Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax Reclassification of unrealized loss on investments into earnings, tax Other Comprehensive Income Loss Reclassification Adjustment From A O C I For Sale Of Securities Tax Stock issued during period shares restricted stock and stock options exercised. Stock issued during period value restricted stock and stock options exercised. Reclassification of losses on investments into earnings. Stock retirement of escrow shares during period, shares. Stock retirement of escrow shares during period, value. Statement Of Stockholders Equity [Abstract] Statement [Table] Statement [Table] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock [Member] Common Stock [Member] Treasury Stock [Member] Treasury Stock [Member] Additional Paid-in Capital [Member] Additional Paid In Capital [Member] Accumulated Deficit [Member] Retained Earnings [Member] Accumulated Other Comprehensive Loss [Member] Accumulated Other Comprehensive Income [Member] Statement [Line Items] Statement [Line Items] Beginning balance Beginning balance, shares Shares Outstanding Stock-based compensation Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Exercise of stock options and issuance of restricted stock Stock Issued During Period Value Restricted Stock And Stock Options Exercised Exercise of stock options and issuance of restricted stock, shares Stock Issued During Period Shares Restricted Stock And Stock Options Exercised Cumulative-effect adjustment for previously unrecognized excess tax benefits Cumulative Effect On Retained Earnings Tax1 Excess tax benefit of stock options exercised Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation Employee stock purchase plan Stock Issued During Period Value Employee Stock Purchase Plan Employee stock purchase plan, shares Stock Issued During Period Shares Employee Stock Purchase Plans Stock issued for acquisition Stock Issued During Period Value Acquisitions Stock issued for acquisition, Shares Stock Issued During Period Shares Acquisitions Retirement of escrow shares Stock Retirement Of Escrow Shares During Period Value Retirement of escrow shares, shares Stock Retirement Of Escrow Shares During Period Shares Repurchases of common stock Treasury Stock Value Acquired Cost Method Repurchases of common stock, shares Treasury Stock Shares Acquired Net income (loss) Foreign currency translation adjustments Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Reclassification of losses on investments into earnings Reclassification Of Losses On Investments Into Earnings Reclassification of losses on investments into earnings Unrealized loss on investments Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax Ending balance Ending balance, shares The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase and the cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill. Statement Of Cash Flows [Abstract] Cash flows from operating activities Net Cash Provided By Used In Operating Activities Continuing Operations [Abstract] Net (loss) income Reconciliation of net (loss) 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 Share-based earn-out liability Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 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, net of effects of acquisition 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 Continuing Operations Cash flows from investing activities Net Cash Provided By Used In Investing Activities Continuing Operations [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 Acquisition of business and intangible assets, net of cash acquired Payments To Acquire Businesses Net Of Cash Acquired And Intangible Assets Net cash used in investing activities Net Cash Provided By Used In Investing Activities Continuing Operations Cash flows from financing activities Net Cash Provided By Used In Financing Activities Continuing Operations [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 Excess tax benefit from exercise of options to purchase common stock Excess Tax Benefit From Share Based Compensation Financing Activities 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 Continuing Operations Effect of foreign currency exchange rate changes Effect Of Exchange Rate On Cash And Cash Equivalents Net increase (decrease) in cash and cash equivalents Cash And Cash Equivalents Period Increase Decrease Cash and cash equivalents at beginning of year Cash and cash equivalents at end of year Supplemental disclosure of cash flow information Supplemental Cash Flow Information [Abstract] Cash paid for income taxes, net Income Taxes Paid Net Non-cash financing activities: Noncash Investing And Financing Items [Abstract] Net purchases of property and equipment on account Capital Expenditures Incurred But Not Yet Paid Common stock issued for business acquisitions Stock Issued1 Organization Consolidation And Presentation Of Financial Statements [Abstract] General Organization Consolidation And Presentation Of Financial Statements Disclosure And Significant Accounting Policies [Text Block] Business Combinations [Abstract] Business Acquisitions Business Combination Disclosure [Text Block] Financial Instruments Owned At Fair Value [Abstract] Financial Instruments Financial Instruments Disclosure [Text Block] Allowance for doubtful accounts. Receivables [Abstract] Allowance for Doubtful Accounts Allowance For Doubtful Accounts [Text Block] Property Plant And Equipment [Abstract] Property and Equipment, net Property Plant And Equipment 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] Equity [Abstract] Stockholders’ Equity Stockholders Equity Note 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 (Loss) Per Share Earnings Per Share [Text Block] Compensation And Retirement Disclosure [Abstract] Retirement Savings Plan Pension And Other Postretirement Benefits Disclosure [Text Block] Related Party Transactions [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block] Quarterly Financial Information Disclosure [Abstract] Selected Quarterly Financial Data (Unaudited) Quarterly Financial Information [Text Block]