00000001 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 00000002 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 00000003 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS link:presentationLink link:calculationLink link:definitionLink 00000004 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) link:presentationLink link:calculationLink link:definitionLink 00000005 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 00000006 - Disclosure - DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES - Note 1 link:presentationLink link:calculationLink link:definitionLink 00000007 - Disclosure - REVENUE RECOGNITION - Note 2 link:presentationLink link:calculationLink link:definitionLink 00000008 - Disclosure - FAIR VALUE MEASUREMENTS - Note 3 link:presentationLink link:calculationLink link:definitionLink 00000009 - Disclosure - INTANGIBLE ASSETS - Note 4 link:presentationLink link:calculationLink link:definitionLink 00000010 - Disclosure - GOODWILL - Note 5 link:presentationLink link:calculationLink link:definitionLink 00000011 - Disclosure - COMMITMENTS AND CONTINGENCIES - Note 6 link:presentationLink link:calculationLink link:definitionLink 00000012 - Disclosure - STOCK-BASED COMPENSATION - Note 7 link:presentationLink link:calculationLink link:definitionLink 00000013 - Disclosure - INCOME TAXES - Note 8 link:presentationLink link:calculationLink link:definitionLink 00000014 - Disclosure - NET INCOME (LOSS) PER SHARE - Note 9 link:presentationLink link:calculationLink link:definitionLink 00000015 - Disclosure - SEGMENT REPORTING AND GEOGRAPHICAL INFORMATION - Note 10 link:presentationLink link:calculationLink link:definitionLink 00000016 - Disclosure - ACQUISITIONS - Note 11 link:presentationLink link:calculationLink link:definitionLink 00000017 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 00000018 - Disclosure - Revenue Recognition (Tables) link:presentationLink link:calculationLink link:definitionLink 00000019 - Disclosure - FAIR VALUE MEASUREMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 00000020 - Disclosure - Intangible Assets (Tables) link:presentationLink link:calculationLink link:definitionLink 00000021 - Disclosure - Goodwill (Tables) link:presentationLink link:calculationLink link:definitionLink 00000022 - Disclosure - Commitments And Contingencies (Tables) link:presentationLink link:calculationLink link:definitionLink 00000023 - Disclosure - Distribution of Stock-Based Compensation Plan Expense (Tables) link:presentationLink link:calculationLink link:definitionLink 00000024 - Disclosure - Stock-Based Compensation And Employee Purchase Plan (Tables) link:presentationLink link:calculationLink link:definitionLink 00000025 - Disclosure - Net Income (Loss) Per Share (Tables) link:presentationLink link:calculationLink link:definitionLink 00000026 - Disclosure - Segment Information (Tables) link:presentationLink link:calculationLink link:definitionLink 00000027 - Disclosure - Acquisition (Tables) link:presentationLink link:calculationLink link:definitionLink 00000028 - Disclosure - Description of the Business (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 00000029 - Disclosure - Description of the Business (Acquisitions Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 00000030 - Disclosure - Revenue Recognition - Summary of Impact of ASC 606 (Details) link:presentationLink link:calculationLink link:definitionLink 00000031 - Disclosure - Revenue Recognition - Contract Balances with Contract Customers (details) link:presentationLink link:calculationLink link:definitionLink 00000032 - Disclosure - Revenue Recognition - Schedule of Changes in Contract Assets and Deferred Revenues (Details) link:presentationLink link:calculationLink link:definitionLink 00000033 - Disclosure - Revenue Recognition - Estimated Revenue Expected to be Recognized in Future Related to Performance Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 00000034 - Disclosure - Cash, Cash Equivalents and Investments with Hierarchy (Details) link:presentationLink link:calculationLink link:definitionLink 00000035 - Disclosure - Intangible Assets Schedule Of Intangibles (Details) link:presentationLink link:calculationLink link:definitionLink 00000036 - Disclosure - Intangible Assets Schedule Of Future Amortization Of Intangibles (Details) link:presentationLink link:calculationLink link:definitionLink 00000037 - Disclosure - Changes in Carrying Amount of Goodwill by Location (Detail) link:presentationLink link:calculationLink link:definitionLink 00000038 - Disclosure - Commitments and Contingencies (Operating Leases) (Details) link:presentationLink link:calculationLink link:definitionLink 00000039 - Disclosure - Commitments and Contingencies (Operating Leases Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 00000040 - Disclosure - Stock-based Compensation Stock-Based Compensation Expense By Statement Of Operations (Details) link:presentationLink link:calculationLink link:definitionLink 00000041 - Disclosure - Stock-based Compensation Option Activity (Details) link:presentationLink link:calculationLink link:definitionLink 00000042 - Disclosure - Stock-based Compensation Stock Awards Activity (Details) link:presentationLink link:calculationLink link:definitionLink 00000043 - Disclosure - Stock-based Compensation (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 00000044 - Disclosure - Stock Repurchases 2017 (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 00000045 - Disclosure - Income Taxes (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 00000046 - Disclosure - Net Income (Loss) Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 00000047 - Disclosure - Net Income (Loss) Per Share (Options and Awards Excluded) (Details) link:presentationLink link:calculationLink link:definitionLink 00000048 - Disclosure - Segment Reporting Revenue and Property and Equipment by Geographic Area (Details) link:presentationLink link:calculationLink link:definitionLink 00000049 - Disclosure - Acquisitions (Details) link:presentationLink link:calculationLink link:definitionLink