-Network: (00 - Document - Document and Company Information)

-Document and Company Information [Abstract] {ID1}

Entity Registrant Name {ID2}

Entity Central Index Key {ID3}

Document Type {ID4}

Document Period End Date {ID5}

Amendment Flag {ID6}

Current Fiscal Year End Date {ID7}

Entity Well-known Seasoned Issuer {ID8}

Entity Voluntary Filers {ID9}

Entity Current Reporting Status {ID10}

Entity Filer Category {ID11}

Entity Public Float {ID12}

Entity Common Stock, Shares Outstanding {ID13}

-Network: (01 - Statement - Condensed Consolidated Balance Sheets)

-Balance Sheets [Abstract] {ID14}

-Statement [Table] {ID15}

-Statement [Line Items] {ID16}

-ASSETS {ID17}

-Current Assets: {ID18}

Cash and cash equivalents {ID19}

Marketable securities (including restricted cash of $0 at June 30, 2009 and $1,669 at December 31, 2008) {ID20}

Accounts receivable, net of reserves of $1,046 ($1,234 in 2008) {ID21}

Deferred costs, current {ID22}

Deferred tax asset {ID23}

Prepaid expenses and other current assets {ID24}

Total current assets {ID25}

Property and equipment, net {ID26}

Deferred costs, non-current {ID27}

Other assets {ID28}

Restricted cash, non-current {ID29}

Intangible assets, net {ID30}

Goodwill {ID31}

Total Assets {ID32}

-LIABILITIES AND STOCKHOLDERS' EQUITY {ID33}

-Current Liabilities: {ID34}

Accounts payable {ID35}

Accrued expenses {ID36}

Deferred revenue, current {ID37}

Accrued restructuring, current {ID38}

Total current liabilities {ID39}

Other liabilities {ID40}

Deferred revenue, non-current {ID41}

Commitments and Contingencies {ID42}

-Stockholders' equity: {ID43}

Preferred stock, $0.01 par value; authorized -10,000,000 shares; issued and outstanding-no shares {ID44}

Common stock, $0.01 par value; authorized-200,000,000 shares; issued - 132,967,856 shares and 131,572,773 shares at June 30, 2009 and December 31, 2008, respectively {ID45}

Additional paid-in capital {ID46}

Accumulated deficit {ID47}

Treasury stock, at cost (5,605,501 shares at June 30, 2009 and December 31,2008) {ID48}

Accumulated other comprehensive loss {ID49}

Total stockholders' equity {ID50}

Total Liabilities and Stockholders' Equity {ID51}

-Network: (011 - Statement - Condensed Consolidated Balance Sheets (Parenthetical))

-Balance Sheets (Parenthetical) [Abstract] {ID52}

-Statement [Table] {ID53}

-Statement [Line Items] {ID54}

Restricted cash {ID55}

Reserves, Accounts receivable {ID56}

Preferred stock, par value {ID57}

Preferred stock, shares authorized {ID58}

Preferred stock, shares issued {ID59}

Preferred stock, shares outstanding {ID60}

Common stock, par value {ID61}

Common stock, shares authorized {ID62}

Common stock, shares issued {ID63}

Treasury stock, shares {ID64}

-Network: (02 - Statement - Condensed Consolidated Statements of Operations)

-Statements of Operations [Abstract] {ID65}

-Statement [Table] {ID66}

-Statement [Line Items] {ID67}

-Revenue: {ID68}

Product licenses {ID69}

Recurring services {ID70}

Professional and education services {ID71}

Total revenue {ID72}

-Cost of Revenue: {ID73}

Product licenses {ID74}

Recurring services {ID75}

Professional and education services {ID76}

Total cost of revenue {ID77}

Gross Profit {ID78}

-Operating Expenses: {ID79}

Research and development {ID80}

Sales and marketing {ID81}

General and administrative {ID82}

Total operating expenses {ID83}

Income (loss) from operations {ID84}

Interest and other income, net {ID85}

Income (loss) before provision for income taxes {ID86}

Provision for income taxes {ID87}

Net income (loss) {ID88}

Basic net income (loss) per share {ID89}

Diluted net income (loss) per share {ID90}

Basic weighted average common shares outstanding {ID91}

Diluted weighted average common shares outstanding {ID92}

-Network: (03 - Statement - Condensed Consolidated Statements of Cash Flows)

-Statements of Cash Flows [Abstract] {ID93}

-Statement [Table] {ID94}

-Statement [Line Items] {ID95}

-Cash Flows from Operating Activities: {ID96}

Net income (loss) {ID97}

-Adjustments to reconcile net income (loss) to net cash provided by operating activities: {ID98}

Depreciation and amortization {ID99}

Non-cash stock-based compensation expense {ID100}

-Changes in current assets and liabilities: {ID101}

Accounts receivable {ID102}

Prepaid expenses and other current assets {ID103}

Deferred costs {ID104}

Other assets {ID105}

Accounts payable {ID106}

Accrued expenses and other liabilities {ID107}

Deferred revenue {ID108}

Accrued restructuring {ID109}

Net cash provided by operating activities {ID110}

-Cash Flows from Investing Activities: {ID111}

Purchases of marketable securities {ID112}

Maturities of marketable securities {ID113}

Purchases of property and equipment {ID114}

Collateralization of letters of credit {ID115}

Payment of acquisition costs, net of cash acquired {ID116}

Net cash used in investing activities {ID117}

-Cash Flows from Financing Activities: {ID118}

Proceeds from exercise of stock options {ID119}

Proceeds from employee stock purchase plan {ID120}

Repurchase of common stock {ID121}

Payments of employee restricted stock tax withholdings {ID122}

Net cash provided by (used in) financing activities {ID123}

Effect of foreign exchange rate changes on cash and cash equivalents {ID124}

Net increase in cash and cash equivalents {ID125}

Cash and cash equivalents, beginning of period {ID126}

Cash and cash equivalents, end of period {ID127}

-Network: (0601 - Disclosure - Organization, Business and Summary of Significant Accounting Policies)

-Organization, Business and Summary of Significant Accounting Policies [Abstract] {ID128}

Organization, Business and Summary of Significant Accounting Policies {ID129}

-Network: (0602 - Disclosure - Net Income (Loss) Per Share)

-Net Income (Loss) Per Share [Abstract] {ID130}

Net Income (Loss) Per Share {ID131}

-Network: (0603 - Disclosure - Stock-Based Compensation)

-Stock-Based Compensation [Abstract] {ID132}

Stock - Based Compensation {ID133}

-Network: (0604 - Disclosure - Share Repurchase Program)

-Share Repurchase Program [Abstract] {ID134}

Share Repurchase Program {ID135}

-Network: (0605 - Disclosures - About Segments of an Enterprise)

-Disclosures About Segments of an Enterprise [Abstract] {ID136}

Disclosures About Segments of an Enterprise {ID137}

-Network: (0606 - Disclosure - Fair Value Measurement)

-Fair Value Measurement [Abstract] {ID138}

Fair Value Measurement {ID139}

-Network: (0607 - Disclosure - Restricted Cash)

-Restricted Cash [Abstract] {ID140}

Restricted Cash {ID141}

-Network: (0608 - Disclosure - Acquisitions - CleverSet, Inc.)

-Acquisitions - CleverSet, Inc. [Abstract] {ID142}

Acquisitions - CleverSet, Inc. {ID143}

-Network: (0609 - Disclosure - Commitments and Contingencies)

-Commitments and Contingencies [Abstract] {ID144}

Commitments and Contingencies {ID145}

-Network: (0610 - Disclosure - Goodwill and Intangible Assets)

-Goodwill and Intangible Assets [Abstract] {ID146}

Goodwill and Intangible Assets {ID147}

-Network: (0611 - Disclosure - Income Taxes)

-Income Taxes [Abstract] {ID148}

Income Taxes {ID149}

-Network: (0612 - Disclosure - Litigation)

-Litigation [Abstract] {ID150}

Litigation {ID151}

ART TECHNOLOGY GROUP INC XBRL Taxonomy Presentation Networks