Current assets: Assets, Current [Abstract] Current liabilities: Liabilities, Current [Abstract] Stockholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Total liabilities and stockholders' equity Total liabilities and stockholders' equity Liabilities and Stockholders' Equity Stockholders' Equity Attributable to Parent Ending Balance Beginning Balance Total stockholders' equity Accumulated deficit Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit) Additional paid-in capital Additional Paid in Capital, Common Stock, Beginning Balance Additional Paid in Capital, Common Stock, Ending Balance Additional Paid in Capital, Common Stock Common Stock, Value, Issued Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Total Common stock, $0.01 par value; 200,000,000 shares authorized; 34,666,197 and 34,854,554 shares issued and outstanding, respectively Preferred Stock, Value, Issued Preferred Stock, Value, Issued, Ending Balance Preferred Stock, Value, Issued, Beginning Balance Preferred Stock, Value, Issued, Total Preferred stock, $0.01 par value; 5,000,000 shares authorized; no shares issued or outstanding Total liabilities Liabilities Deferred revenues, noncurrent portion Deferred revenues, noncurrent portion Deferred Revenue, Noncurrent Deferred rent, noncurrent portion Deferred Rent Credit, Noncurrent Total current liabilities Liabilities, Current, Total Liabilities, Current Deferred Revenue, Current Deferred revenues, current portion Deferred revenues, current portion Deferred rent, current portion Deferred Rent Credit, Current Accrued expenses Accrued Liabilities, Current, Total Accrued Liabilities, Current Accounts payable Accounts Payable, Current, Total Accounts Payable, Current Total assets Assets Goodwill Goodwill, Beginning Balance Goodwill, Ending Balance Goodwill Other assets Other Assets, Noncurrent, Total Other Assets, Noncurrent Property and equipment, net Property, Plant and Equipment, Net, Total Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net Restricted cash Restricted Cash and Cash Equivalents, Noncurrent Deferred tax asset, noncurrent portion Deferred Tax Assets, Net, Noncurrent, Total Deferred Tax Assets, Net, Noncurrent Total current assets Assets, Current, Total Assets, Current Deferred cost of revenues Deferred Costs, Current Deferred tax asset, current portion Deferred Tax Assets, Net, Current, Total Deferred Tax Assets, Net, Current, Beginning Balance Deferred Tax Assets, Net, Current, Ending Balance Deferred Tax Assets, Net, Current Prepaid expenses and other current assets Prepaid expenses and other current assets Sum of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer. Accounts Receivable, Net, Current Accounts Receivable, Net, Current, Total Accounts receivable, net of allowance for doubtful accounts of $994 and $799, respectively Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash and cash equivalents Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income (loss) to net cash provided by operating activities [Abstract] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Changes in operating assets and liabilities, net of effect of acquisitions: Increase (Decrease) in Operating Capital [Abstract] Cash and Cash Equivalents, Period Increase (Decrease) Cash and Cash Equivalents, Period Increase (Decrease), Total Net decrease in cash and cash equivalents Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities, Total Net Cash Provided by (Used in) Financing Activities Proceeds from exercise of stock options Proceeds from Stock Options Exercised Excess Tax Benefit from Share-based Compensation, Financing Activities Excess tax benefits from stock-based compensation Proceeds from Long-term Lines of Credit Releases of letters of credit Releases of letters of credit Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities, Total Net Cash Provided by (Used in) Investing Activities Payments to Acquire Businesses, Net of Cash Acquired Acquisitions, net of cash acquired Acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired, Total Acquisitions, net of cash acquired Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Operating Activities, Total Net cash used in operating activities Deferred revenues Increase (Decrease) in Deferred Revenue Accrued expenses Increase (Decrease) in Accrued Liabilities, Total Increase (Decrease) in Accrued Liabilities Accounts payable Increase (Decrease) in Accounts Payable, Total Increase (Decrease) in Accounts Payable Increase (Decrease) in Deferred Charges Deferred cost of revenues Deferred cost of revenues Increase (Decrease) in Prepaid, Deferred Expense and Other Assets Prepaid expenses and other current assets Increase (Decrease) in Prepaid, Deferred Expense and Other Assets, Total Prepaid expenses and other current assets Increase (Decrease) in Accounts Receivable Accounts receivable Accounts receivable Stock-based compensation Share-based Compensation, Total Share-based Compensation, Total Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction, Total Depreciation, Depletion and Amortization, Nonproduction Amortization of Debt Discount (Premium) Amortization of debt discount and issuance costs Excess Tax Benefit from Share-based Compensation, Operating Activities Excess tax benefit from stock-based compensation Excess tax benefits from exercise of stock options Excess tax benefits from exercise of stock options Deferred Income Tax Expense (Benefit) Deferred Income Tax Expense (Benefit), Total Deferred tax benefit Net Income (Loss) Attributable to Parent Net income (loss) Net income (loss) Revenues: Revenues [Abstract] Other Nonoperating Income (Expense) [Abstract] Other expense, net: Income Tax Expense (Benefit) (Provision for) benefit from income taxes Provision for income taxes (Benefit) provision for income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Cumulative Effects of Changes in Accounting Principles, Noncontrolling Interest Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Cumulative Effects of Changes in Accounting Principles, Noncontrolling Interest, Total Income (loss) before (provision for) benefit from income taxes Other Nonoperating Income (Expense) Other expense, net Interest income Investment Income, Interest Interest expense Interest Expense, Total Interest Expense Operating Income (Loss) Operating Income (Loss), Total Income (loss) from operations General and Administrative Expense General and Administrative Expense, Total General and administrative Selling and Marketing Expense Selling and Marketing Expense, Total Sales and marketing Change in allowance for doubtful accounts Provision for Doubtful Accounts 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, Total Preferred Stock, Shares Issued Preferred stock, shares outstanding Preferred Stock, Shares Outstanding, Beginning Balance Preferred Stock, Shares Outstanding, Ending Balance 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, Total Common Stock, Shares Issued Beginning Balance, Shares Common Stock, Shares Outstanding Ending Balance, Shares Common stock, shares outstanding Consolidated Balance Sheets [Abstract] Goodwill and Intangible Assets [Abstract] Goodwill and Intangible Assets. Nature of Business and Organization [Abstract] Stock-Based Compensation [Abstract] Stock Incentive Plan [Abstract] Stock-Based Compensation [Text Block] Stock-Based Compensation Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Entity Common Stock, Shares Outstanding Statement [Table] Statement [Line Items] Commitments and Contingencies Consolidated Statements of Cash Flows [Abstract] Total revenues Sales Revenue, Net Total revenues Stock Based Compensation [Member] Stock-Based Compensation Stock Based Compensation. Weighted average number of common shares: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Diluted Earnings Per Share, Diluted Basic Earnings Per Share, Basic Basic Weighted Average Number of Shares Outstanding, Basic Diluted Weighted Average Number of Shares Outstanding, Diluted Net income per common share [Abstract] Net income (loss) per common share: Consolidated Statements of Operations [Abstract] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current, Beginning Balance Allowance for Doubtful Accounts Receivable, Current, Ending Balance Allowance for Doubtful Accounts Receivable, Current Intangible assets, net Finite-Lived Intangible Assets, Net Amortization of intangibles resulting from acquisitions Amortization of Intangible Assets Amortization of intangibles resulting from acquisitions Amortization of intangibles resulting from acquisitions Amortization of intangibles resulting from acquisitions Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment, Total Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment Mergers and Acquisitions [Abstract] Mergers and Acquisitions. Mergers and Acquisitions Business Combination Disclosure [Text Block] Significant Accounting Policies [Text Block] Basis of Presentation Significant Accounting Policies Nature of Operations [Text Block] Nature of Business and Organization Interest expense Operating expenses: Costs and Expenses [Abstract] Total operating expenses Costs and Expenses Commitments and contingencies Increase (Decrease) In Deferred Rent Increase (Decrease) In Deferred Rent. Deferred rent Commitments and Contingencies [Abstract] Commitments and Contingencies. Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Quarterly Financial Information (Unaudited) [Abstract] Quarterly Financial Information [Text Block] Quarterly Financial Information (Unaudited) Document Fiscal Year Focus Document Fiscal Period Focus Product Revenue consists principally of revenues from annual software licenses, subscription fees from customers accessing on-demand application services, student support services and application hosting services. Product revenues also consist of the sale of hardware, including third-party hardware. Product Revenue Revenue consists principally of revenues from annual software licenses, subscription fees from customers accessing on-demand application services, student support services and application hosting services. Product revenues also consist of the sale of hardware, including third-party hardware. Technology Services Revenue Professional services Cost Of Product Revenues Cost of product revenues Cost of product revenues, excludes $2,508 and $1,560 for the three months ended March 31, 2010 and 2011, respectively, in amortization of acquired technology included in amortization of intangibles resulting from acquisitions shown below Cost of product revenues include license and other fees that are owed to third parties upon licensing software, and the cost of hardware bundled with software. Cost of product revenues also includes amortization of internally developed technology available for sale, telecommunications costs, all direct materials and shipping and handling costs, employee compensation, including bonuses, stock-based compensation and benefits for personnel supporting hosting, support and production functions, as well as related facility rent, communication costs, utilities, depreciation expense and cost of external professional services used in these functions. Cost of product revenues excludes amortization of acquired technology intangibles resulting from acquisitions, which is included as amortization of intangibles acquired in acquisitions. Technology Services Costs Cost of professional services revenues Research and Development Expense, Software (Excluding Acquired in Process Cost) Research and development Document and Entity Information [Abstract] Document And Entity Information Abstract. Deferred Tax Liabilities, Noncurrent Deferred tax liability, noncurrent portion Deferred tax liability, noncurrent portion Significant Accounting Policies [Abstract] Significant Accounting Policies. Significant Accounting Policies [Abstract] Convertible Notes Payable, Current Convertible senior notes, net of debt discount of $2,674 and $1,174, respectively Accumulated other comprehensive income, net Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Debt Discount On Convertible Notes Current Debt Discount on convertible senior notes, current Debt Discount On Convertible Notes Current. Subsequent Event [Abstract] Subsequent Event. Schedule of Subsequent Events [Text Block] Subsequent Event Credit Facilities and Notes Payable [Abstract] Credit Facilities and Notes Payable. Credit Facilities And Notes Payable [Text Block] Credit Facilities and Notes Payable. Credit Facilities and Notes Payable Amortization of acquired technology Aggregate amount of amortization expense recognized for acquired technology intangible asset during the period. A recognized acquired technology intangible asset shall be amortized over its estimated useful life to the reporting entity unless that life is determined to be indefinite. If an acquired technology intangible asset has a finite useful life, but the precise length of that life is not known, that acquired technology intangible asset shall be amortized over the best estimate of its useful life. Amortization Of Acquired Technology