Document and Entity Information Statement [Table] Statement [Line Items] Statement 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 Document Fiscal Year Focus Document Fiscal Period Focus CONSOLIDATED BALANCE SHEETS Assets [Abstract] ASSETS Assets, Current [Abstract] Current assets: 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 Available-for-sale Securities, Current Marketable securities Accounts Receivable, Net, Current Accounts receivable, net of allowance for doubtful accounts of $88 and $237 at December 31, 2014 and 2013, respectively Accounts receivable Prepaid Expense and Other Assets, Current Prepaid expenses and other assets Deferred Tax Assets, Net, Current Deferred tax assets Assets, Current Total current assets Available-for-sale Securities, Noncurrent Marketable securities Property, Plant and Equipment, Net Property and equipment, net Property and equipment, net Goodwill Balance at the end of the period Balance at the beginning of the period Goodwill Intangible Assets, Net (Excluding Goodwill) Intangible assets, net Net amount Deferred Tax Assets, Net, Noncurrent Deferred tax assets Other Assets, Noncurrent Other assets Assets Total assets Liabilities and Equity [Abstract] LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities, Current [Abstract] Current liabilities: Accounts Payable, Current Accounts payable Accrued Liabilities, Current Accrued expenses Total Deferred Revenue, Current Deferred revenues Business Combination Contingent Consideration Liability Current Contingent consideration obligation Liabilities, Current Total current liabilities Capital Lease Obligations, Noncurrent Lease financing obligation - long-term Business Combination Contingent Consideration Liability Noncurrent Contingent consideration obligation - long-term Convertible Notes Payable, Noncurrent Convertible debt Deferred Tax Liabilities, Net, Noncurrent Deferred tax liability Non-current deferred tax liability Other Liabilities, Noncurrent Other liabilities Stockholders' Equity Attributable to Parent [Abstract] Stockholders' equity: Preferred Stock, Value, Issued Preferred stock, $0.0001 par value; 10,000 shares authorized, 0 shares issued and outstanding at December 31, 2014 and 2013 Common Stock, Value, Issued Common stock, $0.0001 par value; 100,000 shares authorized, 46,444 and 44,456 shares issued; 42,711 and 40,663 outstanding at December 31, 2014 and December 31, 2013, respectively Treasury Stock, Value Treasury stock, at cost (3,733 and 3,793 shares at December 31, 2014 and 2013, respectively) Additional Paid in Capital, Common Stock Additional paid-in capital Accumulated Other Comprehensive Income (Loss), Net of Tax Balance at the end of the period Balance at the beginning of the period Accumulated other comprehensive loss Retained Earnings (Accumulated Deficit) Retained earnings Stockholders' Equity Attributable to Parent Balance Balance Total stockholders' equity Liabilities and Equity Total liabilities and stockholders' equity Allowance for Doubtful Accounts Receivable, Current Accounts receivable, allowance for doubtful accounts (in dollars) Preferred Stock, Par or Stated Value Per Share Preferred stock, par value (in dollars per share) Preferred Stock, Shares Authorized Preferred stock, shares authorized Designated preferred stock (in shares) Preferred Stock, Shares Issued Preferred stock, shares issued Preferred Stock, Shares Outstanding Preferred stock, shares outstanding Preferred stock outstanding Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock, Shares Authorized Common stock, shares authorized Designated common stock (in shares) Common Stock, Shares, Issued Balance (in shares) Balance (in shares) Common stock, shares issued Common Stock, Shares, Outstanding Common stock, shares outstanding Treasury Stock, Shares Treasury stock, shares CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME Revenues Net revenues Revenues Costs and Expenses [Abstract] Costs and expenses: Cost of Services Cost of services Research and Development Expense Research and development Selling, General and Administrative Expense Selling, general and administrative Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Change in the contingent consideration obligation Net change in contingent consideration obligation Fair value adjustment to contingent obligation included in net income Restructuring Charges. Restructuring charges Charges Depreciation, Depletion and Amortization Depreciation and amortization Costs and Expenses Total costs and expenses Operating Income (Loss) Income from operations Investment Income, Interest Interest income Interest Expense Interest expense Other Nonoperating Income Other income Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Income before income tax expense Income Tax Expense (Benefit) Income tax expense Income tax expense Net Income (Loss) Attributable to Parent Net income Net income Net income attributable to common stockholders Earnings per Common Share Net income per common share: Basic and Diluted Net Income Attributable to Common Stockholders per Common Share Earnings Per Share, Basic Basic (in dollars per share) Earnings Per Share, Diluted Diluted (in dollars per share) Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted-average common shares outstanding: Denominator: Weighted Average Number of Shares Outstanding, Basic Basic (in shares) Weighted average common shares outstanding - basic Weighted Average Number of Shares Outstanding, Diluted Diluted (in shares) Weighted average common shares outstanding - diluted CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Foreign currency translation Foreign currency translation adjustments Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Net unrealized (loss) gain net of tax reported as a component of accumulated other comprehensive (loss) income Unrealized gain (loss) on securities, (net of tax) Unrealized loss on investments in marketable securities, net of tax benefits of $18, $2 and $82 during the period 2013, 2012 and 2011, respectively Represents the amount after tax, changes to accumulated comprehensive income resulting from net gain (loss) on intra-entity foreign currency transactions. Other Comprehensive Income, Net Gain (Loss) on Intra Entity Foreign Currency Transactions Arising During Period, Net of Tax Net (loss) on intra-entity foreign currency transactions Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Total other comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total other comprehensive income (loss) CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock Treasury Stock [Member] Treasury Stock Additional Paid In Capital [Member] Additional Paid-in Capital Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive Income (Loss) Retained Earnings [Member] Retained Earnings Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock based compensation Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Issuance of restricted stock Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Issuance of restricted stock (in shares) Stock Issued During Period, Value, Stock Options Exercised Issuance of common stock on exercise of options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Options Exercised (in shares) Issuance of common stock on exercise of options (in shares) Stock Issued During Period, Value, Acquisitions Issuance of common stock related to acquisition Stock Issued During Period, Shares, Acquisitions Issuance of common stock related to acquisition (in shares) Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition ESPP compensation Stock Repurchased During Period, Value Repurchase of treasury stock Stock Repurchased During Period, Shares Repurchase of treasury stock (in shares) Stock Issued During Period, Value, Employee Stock Purchase Plan Sale of Treasury Stock in connection with an employee stock purchase plan Stock Issued During Period, Shares, Employee Stock Purchase Plans Number of shares sold under Employee Stock Purchase Plan Sale of Treasury Stock in connection with an employee stock purchase plan (in shares) Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Comprehensive income: Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation Tax benefit from stock option exercise Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Unrealized loss on investments in marketable securities, tax benefit CONSOLIDATED STATEMENTS OF CASH FLOWS Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: The aggregate expense, excluding amortization of bond premium, recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. Depreciation Depletion and Amortization Excluding Bond Premiums Depreciation and amortization expense Amortization of Financing Costs Amortization of debt issuance costs Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Loss on disposal of asset Amortization of Debt Discount (Premium) Amortization of bond premium Deferred Income Tax Expense (Benefit) Deferred income taxes Represents the non cash portion of interest on leased facility and obligations incurred by the entity during the reporting period. Leased Facility Accrued Noncash Interest Non-cash interest on leased facility Share-based Compensation Stock-based compensation Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable, net of allowance for doubtful accounts Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other current assets Increase (Decrease) in Other Operating Assets Other assets Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Accrued Liabilities Accrued expenses Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. Business Combination Contingent Consideration Arrangements Change in Amount of Contingent Consideration Liability 1 Cash Flow Effect Contingent consideration obligation Excess Tax Benefit from Share-based Compensation, Operating Activities Excess tax benefit from the exercise of stock options Increase (Decrease) in Other Operating Liabilities Other liabilities Increase (Decrease) in Deferred Revenue Deferred revenues Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net cash provided by operating activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Investing activities: Payments to Acquire Property, Plant, and Equipment Purchases of fixed assets Payments to Acquire Available-for-sale Securities Purchases of marketable securities available-for-sale Proceeds from Sale and Maturity of Available-for-sale Securities Sales and maturities of marketable securities available-for-sale Payments to Acquire Businesses, Net of Cash Acquired Business acquired, net of cash Payments to acquire business, net of cash acquired Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Financing activities: Proceeds from Stock Options Exercised Proceeds from the exercise of stock options Cash received from the exercise of stock options Represents the cash outflow for payment of contingent consideration by the entity during the reporting period. Payments on Contingent Consideration Payments on contingent consideration obligation Payments of Debt Issuance Costs Debt issuance costs related to convertible notes Proceeds from Convertible Debt Proceeds from issuance of convertible notes Proceeds from Lines of Credit Proceeds from Credit Facility to fund acquisitions Borrowings on revolving line of credit Repayments of Lines of Credit Repayment of revolving line of credit Payments on Credit Facility Excess Tax Benefit from Share-based Compensation, Financing Activities Excess tax benefit from the exercise of stock options Excess tax benefits included as a financing cash inflow Payments for Repurchase of Common Stock Repurchase of common stock Proceeds from Sale of Treasury Stock Proceeds from the sale of treasury stock in connection with an employee stock purchase plan Cash received under program Repayments of Long-term Capital Lease Obligations Repayments of capital obligations Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash provided by (used in) financing activities Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations Effect of exchange rate changes on cash Net Cash Provided by (Used in) Continuing Operations Net increase (decrease) in cash and cash equivalents Supplemental Cash Flow Information [Abstract] Supplemental disclosures of cash flow information: Interest Paid Cash paid for interest Income Taxes Paid, Net Cash paid for income taxes Noncash Investing and Financing Items [Abstract] Supplemental disclosures of non-cash investing and financing activities: The fair value of common stock issued in connection with the acquisition forming part of non cash transactions. Issuance of Common Stock in Connection with Acquisition Issuance of common stock in connection with the acquisition Description of Business Nature of Operations [Text Block] Description of Business Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Acquisition Business Combination Disclosure [Text Block] Acquisition Fair Value Measurements of Assets and Liabilities Fair Value Disclosures [Text Block] Fair Value Measurements of Assets and Liabilities Property and Equipment Property and Equipment Property, Plant and Equipment Disclosure [Text Block] Property and Equipment Accrued Expenses Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accrued Expenses Capital Structure Disclosure of information about the entity's common and preferred stock. Capital Transactions Disclosure [Text Block] Capital Structure Stock Plans Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock Plans 401(k) Plan Pension and Other Postretirement Benefits Disclosure [Text Block] 401(k) Plan Income Taxes Income Taxes Income Tax Disclosure [Text Block] Income Taxes Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Text Block] Goodwill and Intangibles Restructuring Charges Restructuring and Related Activities Disclosure [Text Block] Restructuring Charges Accumulated Other Comprehensive Income (Loss). Comprehensive Income (Loss) Note [Text Block] Accumulated Other Comprehensive Income (Loss) Debt Debt Disclosure [Text Block] Credit Facility Legal Matters Legal Matters and Contingencies [Text Block] Legal Matters Subsequent Events