Document and Entity Information [Abstract] ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Marketable securities Available-for-sale Securities, Debt Securities, Current Accounts receivable (net of allowance for doubtful accounts of $109,000 and $130,000 as of December 31, 2011 and March 31, 2012, respectively) Accounts Receivable, Net, Current Allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Deferred income tax assets Deferred Tax Assets, Net, Current Deferred income tax assets Total current assets Assets, Current, Total Total current assets Property and equipment, net Property, Plant and Equipment, Net Restricted cash Restricted Cash and Cash Equivalents, Noncurrent Intangibles, net Finite-Lived Intangible Assets, Net Goodwill Goodwill Other assets Other Assets, Noncurrent Deferred income tax assets Deferred Tax Assets, Net, Noncurrent Deferred income tax assets Total assets Assets, Total Total assets LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued liabilities Accrued Liabilities, Current Deferred revenue, current portion Deferred Revenue, Current Deferred revenue, current portion Total current liabilities Liabilities, Current, Total Total current liabilities Deferred revenue, net of current portion Deferred Revenue, Noncurrent Other long-term liabilities Other Liabilities, Noncurrent Other long-term liabilities Total liabilities Liabilities, Total Total liabilities Commitments and contingencies (Note 9) Commitments and Contingencies Preferred stock, $0.01 par value - 5,000,000 shares authorized, 0 shares outstanding as of December 31, 2011 and March 31, 2012 Preferred Stock, Value, Issued Preferred stock, par value Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock, $0.01 par value - 75,000,000 shares authorized as of December 31, 2011 and March 31, 2012; 24,551,641 and 24,594,845 shares issued and outstanding as of December 31, 2011 and March 31, 2012, respectively Common Stock, Value, Issued 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 Additional paid-in capital Additional Paid in Capital, Common Stock Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss Total equity Stockholders' Equity Attributable to Parent, Total Total equity Total liabilities and equity Liabilities and Equity, Total Total liabilities and equity Revenue Sales Revenue, Services, Net Cost of revenue Cost of Services Cost of revenue Gross profit Gross Profit Gross profit Operating expenses Operating Expenses [Abstract] Research and development Research and Development Expense Sales and marketing Selling and Marketing Expense General and administrative General and Administrative Expense Legal settlements Gain (Loss) Related to Litigation Settlement Legal settlements Amortization of acquired intangibles Amortization of Intangible Assets Amortization of acquired intangibles Total operating expenses Operating Expenses, Total Total operating expenses (Loss) income from operations Operating Income (Loss) (Loss) income from operations Interest income, net Investment Income, Interest Other expense Other Nonoperating Expense Other expense Loss (income) before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Loss (income) before income taxes Benefit (provision) for income taxes Income Tax Expense (Benefit) Benefit (provision) for income taxes Net (loss) income Net Income (Loss) Attributable to Parent Net (loss) income Net (loss) income per share: Earnings Per Share [Abstract] Basic Earnings Per Share, Basic Diluted Earnings Per Share, Diluted Weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic Weighted Average Number of Shares Outstanding, Basic Diluted Weighted Average Number of Shares Outstanding, Diluted Net income (loss) Other comprehensive income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Net unrealized gains (losses) on marketable securities, net of tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Net translation gains (losses) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Total other comprehensive income Other Comprehensive Income (Loss), Net of Tax, Total Total other comprehensive income Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile 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] Depreciation and amortization Depreciation, Depletion and Amortization Amortization of premium on investments Accretion (Amortization) of Discounts and Premiums, Investments Amortization of premium on investments Provision for bad debts Provision for Doubtful Accounts Provision for deferred income taxes Deferred Income Tax Expense (Benefit) Income tax benefit from the exercise of stock options Excess Tax Benefit from Share-based Compensation, Operating Activities Income tax benefit from the exercise of stock options Stock-based compensation Share-based Compensation Gain on disposal of equipment Gain (Loss) on Sale of Property Plant Equipment Gain on disposal of equipment Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Accounts receivable Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other current assets Other assets Increase (Decrease) in Other Operating Assets Other assets Accounts payable Increase (Decrease) in Accounts Payable Accrued liabilities Increase (Decrease) in Accrued Liabilities Deferred revenue Increase (Decrease) in Deferred Revenue Other long-term liabilities Increase (Decrease) in Other Operating Liabilities Other long-term liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of marketable securities Payments to Acquire Available-for-sale Securities, Debt Purchases of marketable securities Proceeds from sale or disposal of marketable securities Proceeds from Sale of Available-for-sale Securities, Debt Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment Intangible asset additions Payments to Acquire Intangible Assets Intangible asset additions Cash paid for acquisition, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Cash paid for acquisition, net of cash acquired Increase in restricted cash and deposits Increase (Decrease) in Restricted Cash Increase in restricted cash and deposits Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from issuance of common stock upon option exercises Proceeds from Stock Options Exercised Income tax benefit from the exercise of stock options Excess Tax Benefit from Share-based Compensation, Financing Activities Income tax benefit from the exercise of stock options Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Effect of exchange rate changes on cash and cash equivalents and restricted cash Effect of Exchange Rate on Cash and Cash Equivalents Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Net increase (decrease) in cash and cash equivalents Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Supplemental disclosure of cash flow information Supplemental Cash Flow Information [Abstract] Cash paid for interest Interest Paid Cash paid for income taxes Income Taxes Paid, Net Noncash investing and financing activities Other Noncash Investing and Financing Items [Abstract] Purchases of property and equipment included in accounts payable and accrued liabilities Capital Expenditures Incurred but Not yet Paid Fair value of contingent consideration in connection with acquisition included in accrued liabilities and other long term liabilities Noncash or Part Noncash Acquisition, Other Liabilities Assumed Nature of the Business Nature of Operations [Text Block] Nature of the Business [Abstract] Nature of the Business [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies [Abstract] Summary of Significant Accounting Policies [Abstract] Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Fair Value of Financial Instruments [Abstract] Fair Value of Financial Instruments [Abstract] Acquisitions Business Combination Disclosure [Text Block] Acquisitions [Abstract] Acquisitions [Abstract] Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Goodwill and Intangible Assets [Abstract] Goodwill and Intangible Assets [Abstract] Accrued Expenses Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accrued Expenses [Abstract] Accrued Expenses [Abstract] Income Taxes Income Tax Disclosure [Text Block] Income Taxes [Abstract] Income Taxes [Abstract] Stock Based Awards Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock Based Awards [Abstract] Stock Based Awards [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies [Abstract] Commitments and Contingencies [Abstract] Subsequent Event Subsequent Events [Text Block] Subsequent Event [Abstract] Subsequent Event [Abstract] Amendment Flag Current Fiscal Year End Date Document Period End Date Document Type Entity Central Index Key Entity Common Stock, Shares Outstanding Entity Filer Category Entity Registrant Name Document Fiscal Period Focus Document Fiscal Year Focus Condensed Consolidated Balance Sheets [Abstract] Condensed Consolidated Statements of Operations [Abstract] Condensed Consolidated Statements of Comprehensive Income [Abstract] Condensed Consolidated Statements of Cash Flows [Abstract]