{"text_format":"2","workbook":"xls","n_sheets":16,"sheets":["Document and Entity Information","Condensed Consolidated Balance ","1_Condensed Consolidated Balanc","Condensed Consolidated Statemen","2_Condensed Consolidated Statem","Organization, Business and Summ","Net Income Per Share","Stock-Based Compensation","Disclosures About Segments of a","Fair Value Measurement","Restricted Cash","Acquisitions","Commitments and Contingencies","Goodwill and Intangible Assets","Income Taxes","Litigation"],"not_rendered":{"charts":0,"images":0,"macros":0,"external_links":0,"defined_names":0,"comments":0,"pivot_tables":0},"unopened":[],"bounds":{"document_bytes":16777216,"sheet_cells":100000,"run_cost":"one","rows_first":2000,"rows_last":500,"rows_between":2000,"halvings":0,"cell_chars":16384,"cell_head_chars":4096},"cells_cut":0,"cells_raw":0,"read":"whole","date_system":"1900","formulas":"cached_only"}

{"sheet":"Document and Entity Information","index":0,"n_rows":17,"n_cols":4,"rows_kept":17,"cut":false,"hidden":false,"merged":[],"flags":["formulas_cached_only"]}
["Document and Entity Information (USD $)"]
[null,"3 Months Ended\r\nMar. 31, 2010\r\n","May. 01, 2010\r\n","Jun. 30, 2009\r\n"]
["Document and Entity Information [Abstract]"]
["Entity Registrant Name","ART TECHNOLOGY GROUP INC"]
["Entity Central Index Key","0001086195"]
["Document Type","10-Q"]
["Document Period End Date","2010-03-31"]
["Amendment Flag","false"]
["Document Fiscal Year Focus",2010]
["Document Fiscal Period Focus","Q1"]
["Current Fiscal Year End Date","--12-31"]
["Entity Well-known Seasoned Issuer","No"]
["Entity Voluntary Filers","No"]
["Entity Current Reporting Status","Yes"]
["Entity Filer Category","Accelerated Filer"]
["Entity Public Float",null,null,478760765]
["Entity Common Stock, Shares Outstanding",null,157012768]

{"sheet":"Condensed Consolidated Balance ","index":1,"n_rows":35,"n_cols":3,"rows_kept":35,"cut":false,"hidden":false,"merged":[],"flags":["formulas_cached_only"]}
["Condensed Consolidated Balance Sheets (Unaudited) (USD $)"]
["In Thousands","3 Months Ended\r\nMar. 31, 2010\r\n","12 Months Ended\r\nDec. 31, 2009\r\n"]
["Current Assets:"]
["Cash and cash equivalents",60249,57319]
["Marketable securities (including restricted cash of $50 at March 31, 2010 and December 31, 2009)",78454,21775]
["Accounts receivable (net of reserves of $581 and $1,060 at March 31, 2010 and December 31, 2009, respectively)",36385,41522]
["Deferred costs, current",1216,767]
["Deferred tax asset",430,430]
["Prepaid expenses and other current assets",4934,3359]
["Total current assets",181668,125172]
["Property and equipment, net",11347,9934]
["Deferred costs, less current portion",2025,1387]
["Marketable securities (including restricted cash of $738 at March 31, 2010 and December 31, 2009)",30412,6439]
["Deferred tax asset, less current portion",450,450]
["Other assets",1944,907]
["Intangible assets, net",9600,4064]
["Goodwill",77555,65683]
["Total Assets",315001,214036]
["Current Liabilities:"]
["Accounts payable",3477,5720]
["Accrued expenses",17134,18873]
["Deferred revenue, current portion",42661,42640]
["Total current liabilities",63272,67233]
["Deferred revenue, less current portion",15659,10356]
["Other liabilities",1527,536]
["Commitments and contingencies (Note 8)","",""]
["Stockholders' equity:"]
["Preferred stock, $0.01 par value; authorized - 10,000,000 shares; issued and outstanding-no shares",0,0]
["Common stock, $0.01 par value; authorized - 200,000,000 shares; 163,552,314 shares and 134,117,921 shares issued, respectively; and 156,862,219 shares and 127,427,826 shares outstanding, respectively at March 31, 2010 and December 31, 2009",1636,1341]
["Additional paid-in capital",423747,326925]
["Accumulated deficit",-173091,-175150]
["Treasury stock, at cost (6,690,095 shares at March 31, 2010 and December 31, 2009)",-16075,-16075]
["Accumulated other comprehensive loss",-1674,-1130]
["Total stockholders' equity",234543,135911]
["Total Liabilities and Stockholders' Equity",315001,214036]

{"sheet":"1_Condensed Consolidated Balanc","index":2,"n_rows":16,"n_cols":3,"rows_kept":16,"cut":false,"hidden":false,"merged":[],"flags":["formulas_cached_only"]}
["Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)"]
["In Thousands, except Share data","Mar. 31, 2010\r\n","Dec. 31, 2009\r\n"]
["Current Assets:"]
["Restricted cash included in marketable securities, current",50,50]
["Reserves, accounts receivable",581,1060]
["Restricted cash included in marketable securities, non-current",738,738]
["Stockholders' equity:"]
["Preferred stock, par value",0.01,0.01]
["Preferred stock, shares authorized",10000000,10000000]
["Preferred stock, shares issued",0,0]
["Preferred stock, shares outstanding",0,0]
["Common stock, par value",0.01,0.01]
["Common stock, shares authorized",200000000,200000000]
["Common stock, shares issued",163552314,134117921]
["Common stock, shares, outstanding",156862219,127427826]
["Treasury stock, shares",6690095,6690095]

{"sheet":"Condensed Consolidated Statemen","index":3,"n_rows":27,"n_cols":3,"rows_kept":27,"cut":false,"hidden":false,"merged":[],"flags":["formulas_cached_only"]}
["Condensed Consolidated Statements of Operations (Unaudited) (USD $)"]
["In Thousands, except Per Share data","3 Months Ended\r\nMar. 31, 2010\r\n","3 Months Ended\r\nMar. 31, 2009\r\n"]
["Revenue:"]
["Product licenses",12857,12930]
["Recurring services",26670,23103]
["Professional and education services",5197,5878]
["Total revenue",44724,41911]
["Cost of Revenue:"]
["Product licenses",534,390]
["Recurring services",9716,8897]
["Professional and education services",4840,5302]
["Total cost of revenue",15090,14589]
["Gross Profit",29634,27322]
["Operating Expenses:"]
["Research and development",8661,7470]
["Sales and marketing",14429,12288]
["General and administrative",5125,4489]
["Total operating expenses",28215,24247]
["Income from operations",1419,3075]
["Interest and other income (expense), net",-221,211]
["Income before income taxes",1198,3286]
["Provision (benefit) for income taxes",-861,312]
["Net income",2059,2974]
["Basic net income per share",0.01,0.02]
["Diluted net income per share",0.01,0.02]
["Basic weighted average common shares outstanding",146157,126113]
["Diluted weighted average common shares outstanding",154514,129368]

{"sheet":"2_Condensed Consolidated Statem","index":4,"n_rows":36,"n_cols":3,"rows_kept":36,"cut":false,"hidden":false,"merged":[],"flags":["formulas_cached_only"]}
["Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)"]
["In Thousands","3 Months Ended\r\nMar. 31, 2010\r\n","3 Months Ended\r\nMar. 31, 2009\r\n"]
["Cash Flows from Operating Activities:"]
["Net income",2059,2974]
["Adjustments to reconcile net income to net cash provided by operating activities:"]
["Depreciation and amortization",2764,2263]
["Stock-based compensation expense",2361,1955]
["Amortization of investment premiums",308]
["Non-cash deferred tax benefit",-1073]
["Net changes in current assets and liabilities:"]
["Accounts receivable",6094,4527]
["Prepaid expenses and other current assets",-1396,319]
["Deferred costs",-1086,234]
["Accounts payable",-2593,1345]
["Accrued expenses and other liabilities",-2081,-3381]
["Deferred revenue",4192,-1999]
["Accrued restructuring",null,-146]
["Net cash provided by operating activities",9549,8091]
["Cash Flows from Investing Activities:"]
["Purchases of marketable securities",-84018,-1929]
["Maturities of marketable securities",2968,5243]
["Purchases of property and equipment",-2342,-1329]
["Increase in other assets",-1000]
["Acquisition of business, net of cash acquired",-15140]
["Net cash provided by (used in) investing activities",-99532,1985]
["Cash Flows from Financing Activities:"]
["Proceeds from exercise of stock options",476,149]
["Proceeds from employee stock purchase plan",298,242]
["Net proceeds from equity offering",94968]
["Repayment of acquired debt",-1573]
["Payments of employee restricted stock tax withholdings",-990,-383]
["Net cash provided by financing activities",93179,8]
["Effect of foreign exchange rate changes on cash and cash equivalents",-266,-276]
["Net increase in cash and cash equivalents",2930,9808]
["Cash and cash equivalents, beginning of period",57319,47413]
["Cash and cash equivalents, end of period",60249,57221]

{"sheet":"Organization, Business and Summ","index":5,"n_rows":4,"n_cols":2,"rows_kept":4,"cut":false,"hidden":false,"merged":[],"flags":["formulas_cached_only"]}
["Organization, Business and Summary of Significant Accounting Policies"]
[null,"3 Months Ended\r\nMar. 31, 2010\r\n"]
["Organization, Business and Summary of Significant Accounting Policies [Abstract]"]
["Organization, Business and Summary of Significant Accounting Policies","  \r\r(1)Organization, Business and Summary of Significant Accounting Policies  \r\rArt Technology Group, Inc. (ATG or the Company) develops and markets a comprehensive suite of e-commerce software products, and provides related services including support and maintenance, education, application hosting, professional services and eStara Optimization service solutions for enhancing online sales and support.  \r\r(a)Principles of Consolidation  \r\rThe accompanying unaudited condensed consolidated financial statements of the Company have been prepared pursuant to the rules of the Securities and Exchange Commission for quarterly reports on Form 10-Q and Article10 of RegulationS-X. Accordingly, the financial statements do not include all of the information and footnotes required by United States generally accepted accounting principles, and while the Company believes that the disclosures presented are adequate to make the information presented not misleading, these financial statements should be read in conjunction with the audited financial statements and related notes included in the Companys 2009 Annual Report on Form 10-K. In the opinion of management, the accompanying unaudited condensed consolidated financial statements and notes contain all adjustments, consisting of normal recurring accruals, considered necessary for a fair presentation of the Companys financial position, results of operations, and cash flows at the dates and for the periods indicated. The operating results for the three months ended March31, 2010 are not necessarily indicative of the results to be expected for the full year ending December31, 2010.  \r\rThe accompanying consolidated financial statements include the accounts of ATG and its wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.  \r\r(b)Use of Estimates  \r\rThe preparation of consolidated financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Such estimates relate to revenue recognition, the allowance for doubtful accounts, useful lives of fixed assets and identifiable intangible assets, deferred costs, software development costs, accrued liabilities, accrued taxes, deferred tax valuation allowances, and assumptions pertaining to share-based payments. Actual results could differ from those estimates.  \r\r(c)Accounts Receivable  \r\rAccounts receivable represents amounts currently due from customers. Accounts receivable also include $4.4million and $2.5million of unbilled accounts receivable at March31, 2010 and December31, 2009, respectively. Unbilled accounts receivable consist of future billings related to transactions with extended payment terms, as well as future billings for professional services performed but not yet invoiced to the customer. Unbilled accounts receivable related to professional services are generally invoiced the following month.  \r\rATG r"]

{"sheet":"Net Income Per Share","index":6,"n_rows":4,"n_cols":2,"rows_kept":4,"cut":false,"hidden":false,"merged":[],"flags":["formulas_cached_only"]}
["Net Income Per Share"]
[null,"3 Months Ended\r\nMar. 31, 2010\r\n"]
["Net Income Per Share [Abstract]"]
["Net Income Per Share","  \r\r\r(2)Net Income Per Share  \r\rBasic net income per share is computed by dividing net income by the weighted average number of shares of common stock outstanding during the period. Diluted net income per share is computed by dividing net income by the weighted average number of shares of common stock outstanding plus the dilutive effect of common stock equivalents using the treasury stock method. Common stock equivalents consist of stock options, restricted stock and restricted stock unit awards. The assumed proceeds under the treasury stock method include the average unrecognized compensation expense of dilutive stock options and restricted stock awards. This results in the assumed buyback of additional shares thereby reducing the dilutive impact of stock options and restricted stock awards.  \r\rThe following table sets forth the computation of basic and diluted net income per share for the periods indicated (in thousands, except per share amounts):  \r\r\r\t \t\t \t\t \t\t \t\r\r\t \tThree Months Ended March 31,  \r\r\t \t2010 \t\t2009    \r\r\rNet income  \t\t$ \t2,059 \t\t \t$ \t2,974 \t\r\r\rWeighted average common shares outstanding used in computing basic net income per share  \t\t \t146,157 \t\t \t\t126,113 \t\r\r\rDilutive employee common stock equivalents  \t\t \t8,357 \t\t \t\t3,255 \t\r\r\t \t\r\r\rTotal weighted average common stock and common stock equivalent shares outstanding used in computing diluted net income per share  \t\t \t154,514 \t\t \t\t129,368 \t\r\r\t \t\r\r\rBasic net income per share  \t\t$ \t0.01 \t\t \t$ \t0.02 \t\r\r\t \t\r\r\rDiluted net income per share  \t\t$ \t0.01 \t\t \t$ \t0.02 \t\r\r\t \t\r\r\rAnti-dilutive common stock equivalents  \t\t11,083 \t\t \t14,400 \t\r\r\t \t\r\r\r     "]

{"sheet":"Stock-Based Compensation","index":7,"n_rows":4,"n_cols":2,"rows_kept":4,"cut":false,"hidden":false,"merged":[],"flags":["formulas_cached_only"]}
["Stock-Based Compensation"]
[null,"3 Months Ended\r\nMar. 31, 2010\r\n"]
["Stock-Based Compensation [Abstract]"]
["Stock-Based Compensation","  \r\r\r(3)Stock-Based Compensation  \r\rGrant-Date Fair Value of Stock Options  \r\rThe Company uses the Black-Scholes option pricing model to calculate the grant-date fair value of stock options. Information pertaining to stock options granted during the three months ended March31, 2010 and 2009 and related weighted average assumptions is as follows:  \r\r\r\t \t\t \t\t \t\t \t\r\r\t \tThree Months Ended March 31,  \r\r\tStock Options \t\t2010 \t\t2009    \r\r\rOptions granted (in thousands)  \t\t \t1,184 \t\t \t\t614 \t\r\r\rWeighted-average exercise price  \t\t$ \t4.53 \t\t \t$ \t2.16 \t\r\r\rWeighted-average grant date fair value  \t\t$ \t2.86 \t\t \t$ \t1.40 \t\r\r\rAssumptions:  \t\t \t\t \t\t \t\t\r\r\rExpected volatility  \t\t \t67 \t% \t\t \t71 \t%  \r\r\rExpected term (in years)  \t\t \t6.25 \t\t \t\t6.25 \t\r\r\rRisk-free interest rate  \t\t \t2.85 \t% \t\t \t1.98 \t%  \r\r\rExpected dividend yield  \t\t \t\t \t\t \t\t\r\rExpected volatility  The Company has determined that the historical volatility of its common stock is the best indicator of the future volatility of its common stock, and therefore uses historical volatility to estimate the grant-date fair value of stock options. Historical volatility is calculated for the period that is commensurate with the stock options expected term.  \r\rExpected term  The expected term of an option is based on the historical experience for the population of option holders.  \r\rRisk-free interest rate  The yield on zero-coupon U.S. Treasury securities for a period that is commensurate with the expected term is used as the risk-free interest rate.  \r\rExpected dividend yield  The Companys Board of Directors historically has not declared cash dividends and does not expect to issue cash dividends in the future.  \r\rThe Company uses the straight-line attribution method to recognize stock-based compensation expense for stock options. The amount of stock-based compensation recognized during a period is based on the value of the portion of the awards that are ultimately expected to vest. Expected forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. The term forfeitures is distinct from cancellations or expirations and represents only the unvested portion of the surrendered option. The Company has applied a forfeiture rate of 9% to all unvested options as of March31, 2010. This analysis is re-evaluated periodically and the forfeiture rate is adjusted as necessary. Ultimately, the actual expense recognized over the vesting period will only be for those shares that vest.      \r\rStock Option Award Activity  \r\rA summary of the activity under the Companys stock option plans as of March31, 2010 and changes during the three-month period then ended is presented below:  \r\r\r\t \t\t \t\t \t\t \t\t \t\t \t\t \t\t \t\r\r\t \t\t \t\t \tWeighted \t\tWeighted \t\t\r\r\t \t\t \t\t \tAverage \t\tAverage \t\t\r\r\t \t\t \t\t \tExercise \t\tRemaining \t\tAggregate  \r\r\t \tNumber of \t\tPrice \t\tContractual \t\tIntrinsic  \r\r\t \tOptions \t\tPer Share \t\tTerm in Years \t\tValue  \r\r\t \t(in thousands) \t\t \t\t \t\t \t\t \t\t(in thousands)    \r\r\rOptions outstanding at December31, 2009  \t\t \t13,003 \t\t \t$ \t2.83 \t\t \t\t \t\t \t\t \t\r\r\rOptions granted  \t\t \t1,184 \t\t \t\t4.53 \t\t \t\t \t\t \t\t \t\r\r\rOptions exercised  \t\t \t(203 \t) \t\t \t2.35 \t\t \t\t \t\t \t\t "]

{"sheet":"Disclosures About Segments of a","index":8,"n_rows":4,"n_cols":2,"rows_kept":4,"cut":false,"hidden":false,"merged":[],"flags":["formulas_cached_only"]}
["Disclosures About Segments of an Enterprise"]
[null,"3 Months Ended\r\nMar. 31, 2010\r\n"]
["Disclosures About Segments of an Enterprise [Abstract]"]
["Disclosures About Segments of an Enterprise","  \r\r\r(4)Disclosures About Segments of an Enterprise  \r\rOperating segments are components of an enterprise for which separate discrete financial information is available for evaluation by the chief operating decision-maker in making decisions on how to allocate resources and assess performance. The Companys chief operating decision-maker is its Chief Executive Officer. ATG views its operations and manages its business as one segment with three product offerings: software licenses, recurring services, and professional and education services. ATG evaluates these product offerings based on their respective revenues and gross margins. As a result, the financial information disclosed in the consolidated financial statements represents the material financial information related to our principal operating segment.  \r\rRevenues from foreign sources were approximately $11.6million and $13.6million for the three months ended March31, 2010 and 2009, respectively. Revenues from foreign sources were primarily generated from customers located in Europe and the Asia/Pacific region. All of the Companys product sales for the three months ended March31, 2010 and 2009, were delivered from ATGs headquarters located in the United States.  \r\rThe following table represents the percentage of total revenue by geographic region for the three months ended March31, 2010 and March31, 2009:  \r\r\r\t \t\t \t\t \t\t \t\r\r\t \tThree months ended  \r\r\t \tMarch 31,  \r\r\t \t2010 \t\t2009    \r\r\rUnited States  \t\t \t74 \t% \t\t \t66 \t%  \r\r\rUnited Kingdom (UK)  \t\t \t10 \t% \t\t \t25 \t%  \r\r\rEurope, Middle East and Africa (excluding UK)  \t\t \t10 \t% \t\t \t8 \t%  \r\r\rOther  \t\t \t6 \t% \t\t \t1 \t%  \r\r\t \t\r\r\r\t \t100 \t% \t\t \t100 \t%  \r\r\t \t       "]

{"sheet":"Fair Value Measurement","index":9,"n_rows":4,"n_cols":2,"rows_kept":4,"cut":false,"hidden":false,"merged":[],"flags":["formulas_cached_only"]}
["Fair Value Measurement"]
[null,"3 Months Ended\r\nMar. 31, 2010\r\n"]
["Fair Value Measurement [Abstract]"]
["Fair Value Measurement","  \r\r\r(5)Fair Value Measurement  \r\rAs defined in ASC 820-10, Fair Value Measurements and Disclosures (ASC 820-10), fair value is based on the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. In order to increase consistency and comparability in fair value measurements, ASC 820-10 establishes a fair value hierarchy that prioritizes observable and unobservable inputs used to measure fair value into three broad levels, which are described below:  \r\rLevel 1: Quoted prices (unadjusted)in active markets that are accessible at the measurement date for assets or liabilities. The fair value hierarchy gives the highest priority to Level 1 inputs.  \r\rLevel 2: Other inputs that are observable directly or indirectly, such as quoted prices for similar assets and liabilities or market corroborated inputs.  \r\rLevel 3: Unobservable inputs are used when little or no market data is available, which requires the Company to develop its own assumptions about how market participants would value the assets or liabilities. The fair value hierarchy gives the lowest priority to Level 3 inputs.      \r\rIn determining fair value, the Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible in its assessment of fair value.  \r\rThe following table presents the Companys financial assets that are measured at fair value on a recurring basis at March31, 2010:  \r\r\r\t \t\t \t\t \t\t \t\t \t\t \t\t \t\t \t\r\r\t(Dollars in thousands) \t\t \t\t \t\t \t\t \t\t \t\t\r\r\tAt March 31, 2010 \t\tLevel 1 \t\t \tLevel 2 \t\t \tLevel 3 \t\t \tTotal \t\r\r\rAssets:  \t\t \t\t \t\t \t\t \t\t \t\t \t\t \t\t\r\r\rCash and cash equivalents(1)  \t\t \t\t \t\t \t\t \t\t \t\t \t\t \t\t\r\r\rMoney market funds  \t\t$ \t\t \t\t$ \t23,838 \t\t \t$ \t\t \t\t$ \t23,838 \t\r\r\rCorporate debt securities  \t\t \t\t \t\t \t6,125 \t\t \t\t \t\t \t\t6,125 \t\r\r\r\t \t\t \t\t \t\t \t\t \t\t\r\r\rTotal cash and cash equivalents  \t\t \t\t \t\t \t29,963 \t\t \t\t \t\t \t\t29,963 \t\r\r\rDebt securities  current(2)  \t\t \t\t \t\t \t\t \t\t \t\t \t\t \t\t\r\r\rCommercial paper  \t\t \t\t \t\t \t9,687 \t\t \t\t \t\t \t\t9,687 \t\r\r\rU.S. Federal Government securities  \t\t \t12,192 \t\t \t\t \t\t \t\t \t\t \t\t12,192 \t\r\r\rCorporate debt securities  \t\t \t\t \t\t \t50,797 \t\t \t\t \t\t \t\t50,797 \t\r\r\r\t \t\t \t\t \t\t \t\t \t\t\r\r\rTotal debt securities  current  \t\t \t12,192 \t\t \t\t60,484 \t\t \t\t \t\t \t\t72,676 \t\r\r\rDebt securities  non-current(3)  \t\t \t\t \t\t \t\t \t\t \t\t \t\t \t\t\r\r\rU.S. Federal Government securities  \t\t \t8,515 \t\t \t\t \t\t \t\t \t\t \t\t8,515 \t\r\r\rCorporate debt securities  \t\t \t\t \t\t \t21,137 \t\t \t\t \t\t \t\t21,137 \t\r\r\r\t \t\t \t\t \t\t \t\t \t\t\r\r\rTotal debt securities  non-current  \t\t \t8,515 \t\t \t\t21,137 \t\t \t\t \t\t \t\t29,652 \t\r\r\r\t \t\t \t\t \t\t \t\t \t\t\r\r\rTotal Assets:  \t\t$ \t20,707 \t\t \t$ \t111,584 \t\t \t$ \t\t \t\t$ \t132,291 \t\r\r\r\t \t\t \t\t \t\t \t\t \t\t\r\r\t \t\r\r\t(1) \t\tIncluded within cash and cash equivalents in the Consolidated Balance Sheet.  \r\r\r\t(2) \t\tIncluded within marketable securities, current in the Consolidated Balance Sheet.  \r\r\r\t(3) \t\tIncluded within marketable securities, non-current in the Consolidated Balance Sheet.   \r\rWhen available, the Company uses unadjusted quoted market prices to measure the fair value and classifies such items as Level 1. The valuation technique used to measure fair v"]

{"sheet":"Restricted Cash","index":10,"n_rows":4,"n_cols":2,"rows_kept":4,"cut":false,"hidden":false,"merged":[],"flags":["formulas_cached_only"]}
["Restricted Cash"]
[null,"3 Months Ended\r\nMar. 31, 2010\r\n"]
["Restricted Cash [Abstract]"]
["Restricted Cash","  \r\r\r(6)Restricted Cash  \r\rAt March31, 2010, the Company has collateralized $0.8million in outstanding letters of credit with certificates of deposit. The letters of credit were issued in favor of various landlords to secure obligations under ATGs facility leases expiring through December2018. The collateral for the letters of credit is reflected on the Companys balance sheet as restricted cash within short-term and long-term marketable securities dependent on the underlying term of the leases.   "]

{"sheet":"Acquisitions","index":11,"n_rows":4,"n_cols":2,"rows_kept":4,"cut":false,"hidden":false,"merged":[],"flags":["formulas_cached_only"]}
["Acquisitions"]
[null,"3 Months Ended\r\nMar. 31, 2010\r\n"]
["Acquisitions [Abstract]"]
["Acquisitions","  \r\r\r(7)Acquisitions  \r\rOn January8, 2010, the Company acquired all of the outstanding shares of common stock of privately held InstantService.com, Inc. (InstantService) for a purchase price of approximately $15.5million. The results of InstantService have been included in our results from the date of the acquisition. The purchase of InstantService augments the Companys Optimization service offerings with additional click-to-chat functionality and adds an e-mail management solution. At the date of the acquisition, InstantService had more than 300 customers.  \r\rThe Company has determined that the acquisition of InstantService was a non-material business combination under the guidance of ASC Topic 805, Business Combinations. As such, pro forma disclosures are not required and will not be presented within this or future filings. The Company has completed its preliminary allocation of purchase price and has recorded intangible assets of $2.8million of acquired customer list, $3.4million of acquired technology, and $11.9million in goodwill related to this acquisition. The estimated purchase price and allocation is preliminary and may change as additional information related to acquisition consideration and values of acquired assets and assumed liabilities becomes available.   "]

{"sheet":"Commitments and Contingencies","index":12,"n_rows":4,"n_cols":2,"rows_kept":4,"cut":false,"hidden":false,"merged":[],"flags":["formulas_cached_only"]}
["Commitments and Contingencies"]
[null,"3 Months Ended\r\nMar. 31, 2010\r\n"]
["Commitments and Contingencies [Abstract]"]
["Commitments and Contingencies","  \r\r\r(8)Commitments and Contingencies  \r\rIndemnifications  \r\rThe Company in general agrees to indemnification provisions in its software license agreements and service agreements in the ordinary course of its business.  \r\rWith respect to software license and service agreements, these indemnifications generally include provisions indemnifying the customer against losses, expenses, and liabilities from damages that may be awarded against the customer in the event the Companys software is found to infringe upon the intellectual property rights of others. The software license and service agreements generally limit the scope of and remedies for such indemnification obligations in a variety of industry-standard respects. The Company relies on a combination of patent, copyright, trademark and trade secret laws and restrictions on disclosure to protect its intellectual property rights. The Company believes such laws and practices, along with its internal development processes and other policies and practices, limit its exposure related to the indemnification provisions of the software license agreements. However, in recent years there has been significant litigation in the United States involving patents and other intellectual property rights. Companies providing Internet-related products and services are increasingly bringing and becoming subject to suits alleging infringement of proprietary rights, particularly patent rights. From time to time, the Companys customers have been subject to third party patent claims, and the Company has agreed to indemnify these customers from claims to the extent the claims relate to the Companys products.      \r\r\r     "]

{"sheet":"Goodwill and Intangible Assets","index":13,"n_rows":4,"n_cols":2,"rows_kept":4,"cut":false,"hidden":false,"merged":[],"flags":["formulas_cached_only"]}
["Goodwill and Intangible Assets"]
[null,"3 Months Ended\r\nMar. 31, 2010\r\n"]
["Goodwill and Intangible Assets [Abstract]"]
["Goodwill and Intangible Assets","  \r\r\r(9)Goodwill and Intangible Assets  \r\rGoodwill  \r\rThe Company evaluates goodwill for impairment annually and whenever events or changes in circumstances suggest that the carrying value of goodwill may not be recoverable. No impairment of goodwill resulted from the Companys most recent evaluation of goodwill for impairment, which occurred in the fourth quarter of fiscal 2009, nor in any of the periods presented. The Companys next annual impairment assessment will be made in the fourth quarter of 2010. The following table presents the changes in goodwill during fiscal 2010 and 2009 (in thousands):  \r\r\r\t \t\t \t\t \t\t \t\r\r\t \tThree Months \t\tYear Ended  \r\r\t \tEnded March 31, \t\tDecember 31,  \r\r\t \t2010 \t\t2009    \r\r\t \t\r\r\rBalance at the beginning of the period  \t\t$ \t65,683 \t\t \t$ \t65,683 \t\r\r\rAcquisition of InstantService  \t\t \t11,872 \t\t \t\t \t\r\r\t \t\r\r\rBalance at end of period  \t\t$ \t77,555 \t\t \t$ \t65,683 \t\r\r\t \t\r\rIntangible Assets  \r\rThe Company reviews identified intangible assets for impairment whenever events or changes in circumstances indicate that the carrying value of the assets may not be recoverable. Recoverability of these assets is measured by comparison of their carrying value to future undiscounted cash flows the assets are expected to generate over their remaining economic lives. If such assets are considered to be impaired, the impairment to be recognized in the statement of operations equals the amount by which the carrying value of the assets exceeds their fair value determined by either a quoted market price, if any, or a value determined by utilizing a discounted cash flow technique.  \r\rIntangible assets, which will continue to be amortized, consisted of the following (in thousands):  \r\r\r\t \t\t \t\t \t\t \t\t \t\t \t\t \t\t \t\t \t\t \t\t \t\t \t\r\r\t \tMarch 31, 2010 \t\tDecember 31, 2009  \r\r\t \tGross \t\t \t\t \t\t \t\t \t\tGross \t\t \t\t\r\r\t \tCarrying \t\tAccumulated \t\tNet Book \t\tCarrying \t\tAccumulated \t\tNet Book  \r\r\t \tAmount \t\tAmortization \t\tValue \t\tAmount \t\tAmortization \t\tValue    \r\r\rCustomer relationships  \t\t$ \t10,760 \t\t \t$ \t(6,640 \t) \t\t$ \t4,120 \t\t \t$ \t7,460 \t\t \t$ \t(6,032 \t) \t\t$ \t1,428 \t\r\r\rDeveloped technology  \t\t \t9,510 \t\t \t\t(4,450 \t) \t\t \t5,060 \t\t \t\t6,110 \t\t \t\t(3,964 \t) \t\t \t2,146 \t\r\r\rTrademarks  \t\t \t1,400 \t\t \t\t(980 \t) \t\t \t420 \t\t \t\t1,400 \t\t \t\t(910 \t) \t\t \t490 \t\r\r\t \t\r\r\rTotal intangible assets  \t\t$ \t21,670 \t\t \t$ \t(12,070 \t) \t\t$ \t9,600 \t\t \t$ \t14,970 \t\t \t$ \t(10,906 \t) \t\t$ \t4,064 \t\r\r\t \t\r\rIntangible assets are amortized based upon the pattern of estimated economic use or on a straight-line basis over their estimated useful lives, which range from 1 to 5years. Amortization expense related to intangibles was $1.2million and $0.9million for the three-month periods ended March31, 2010 and 2009, respectively.  \r\rThe Company expects amortization expense for these intangible assets to be (in thousands):  \r\r\r\t \t\t \t\r\r\rRemainder of 2010  \t\t$ \t3,165 \t\r\r\r2011  \t\t \t2,372 \t\r\r\r2012  \t\t \t1,340 \t\r\r\r2013  \t\t \t1,340 \t\r\r\r2014  \t\t \t1,340 \t\r\r\r2015  \t\t \t43 \t\r\r\r\t \t\r\r\rTotal  \t\t$ \t9,600 \t\r\r\r     "]

{"sheet":"Income Taxes","index":14,"n_rows":4,"n_cols":2,"rows_kept":4,"cut":false,"hidden":false,"merged":[],"flags":["formulas_cached_only"]}
["Income Taxes"]
[null,"3 Months Ended\r\nMar. 31, 2010\r\n"]
["Income Taxes [Abstract]"]
["Income Taxes","  \r\r\r(10)Income Taxes  \r\rFor the three months ended March31, 2010, the Company recorded an income tax benefit of $0.9 million. This relates to tax expense of approximately $0.2million for U.S. federal alternative minimum tax, state and foreign income taxes as well as interest related to uncertain tax positions offset by a tax benefit of approximately $1.1million related to the reversal of the valuation allowance on certain deferred tax assets as described below. For the three months ended March31, 2009, the Company recorded an income tax provision of $0.3million which related to foreign taxes on earnings in certain of our foreign subsidiaries as well as interest and penalties related to uncertain tax positions.  \r\rDuring the quarter ended March31, 2010, the Company recorded net deferred tax liabilities of approximately $1.1million related to basis differences resulting from the acquisition of InstantService. As a result, the Company released a portion of its valuation allowance amounting to approximately $1.1million. In accordance with ASC 805, Business Combinations the release of the valuation allowance was recorded as a tax benefit in the statement of operations.  \r\rAs of March31, 2010 and December31, 2009 the Company maintained a full valuation allowance against its net U.S. deferred tax assets. The Company does not currently believe that it has sustained profitability over an appropriate time period and in amounts that are sufficient to support a conclusion that a valuation allowance is not required. The Company believes there is significant uncertainty in its future profits due to the growing breadth of its product mix and the effect it can have on the timing of revenue recognition, and the related effect on reported U.S. income. Assuming that, among other factors of positive and negative evidence, the Company meets its estimates of 2010 forecasted earnings, it may release a portion of its U.S. valuation allowance during the second half of 2010, which is consistent with the timing of the Companys annual forecasting exercise.   "]

{"sheet":"Litigation","index":15,"n_rows":4,"n_cols":2,"rows_kept":4,"cut":false,"hidden":false,"merged":[],"flags":["formulas_cached_only"]}
["Litigation"]
[null,"3 Months Ended\r\nMar. 31, 2010\r\n"]
["Litigation [Abstract]"]
["Litigation","  \r\r\r(11)Litigation  \r\rIn December2001, a purported class action complaint was filed against the Companys wholly owned subsidiary Primus Knowledge Solutions, Inc., two former officers of Primus and the underwriters of Primus 1999 initial public offering. The complaints are similar and allege violations of the Securities Act of 1933, as amended, and the Securities Exchange Act of 1934, primarily based on the allegation that the underwriters received undisclosed compensation in connection with Primus initial public offering. The litigation has been coordinated in the United States District Court for the Southern District of New York with claims against approximately 300 other companies that had initial public offerings during the same general time period. The parties have reached a global settlement of the litigation under which insurance will pay the full amount of the settlement share allocated to Primus, and Primus bears no financial liability. In October 2009, the Court issued an order granting final approval of the settlement. Certain objectors are appealing the final order. While the Company cannot predict the outcome of the litigation, it does not expect any material adverse impact to its business, or the results of its operations, from this matter.  \r\rOn or about May15, 2009, LivePerson, Inc. (LivePerson) commenced an action in the United States District Court for the Southern District of New York against InstantService. In the action, LivePerson alleges that InstantService infringes two United States patents held by LivePerson and seeks injunctive relief, damages and attorneys fees. Additionally, LivePerson seeks a declaratory judgment that a United States patent held by InstantService is invalid and is not infringed by LivePerson. InstantService has counter claimed LivePerson seeking a declaratory judgment that the two United States patents held by LivePerson are invalid and are not infringed by InstantService. Additionally, InstantService alleges that LivePerson infringes one of InstantServices patents and seeks injunctive relief, damages and attorneys fees. Discovery in the LivePerson action has not yet commenced. The Company is investigating the claims made by LivePerson and at this early stage has reached no conclusion as to the likelihood of an adverse outcome in the litigation, which the Company intends to contest vigorously.  \r\rThe Companys industry is characterized by the existence of a large number of patents, trademarks and copyrights, and by increasingly frequent litigation based on allegations of infringement or other violations of intellectual property rights. Some of the Companys competitors in the e-commerce software and services market have filed or may file patent applications covering aspects of their technology that they may claim the Companys technology infringes. Such competitors could make claims of infringement against the Company with respect to the Companys products and technology. Additionally, third parties who are not actively engaged in providing e- commerce products or services but who hold or acquire patents upon which they may allege the Companys current or future products or services infringe may make "]