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Disclosure - DESCRIPTION OF BUSINESS link:presentationLink link:calculationLink link:definitionLink 2402401 - Disclosure - DESCRIPTION OF BUSINESS (Details) link:presentationLink link:calculationLink link:definitionLink 2103102 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 2204201 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 2305301 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) link:presentationLink link:calculationLink link:definitionLink 2406402 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2407403 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable Concentration Risk (Details) link:presentationLink link:calculationLink link:definitionLink 2408404 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Concentration Risk (Details) link:presentationLink link:calculationLink link:definitionLink 2109103 - Disclosure - REVENUE link:presentationLink link:calculationLink link:definitionLink 2310302 - Disclosure - REVENUE (Tables) link:presentationLink link:calculationLink link:definitionLink 2411405 - Disclosure - REVENUE - Disaggregation of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 2412406 - Disclosure - REVENUE - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2412406 - Disclosure - REVENUE - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2413407 - Disclosure - REVENUE - Contract Balances on Condensed Consolidated Balance Sheet (Details) link:presentationLink link:calculationLink link:definitionLink 2414408 - Disclosure - REVENUE - Roll Forward of Deferred Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 2415409 - Disclosure - REVENUE - Capitalized Direct Commission Costs (Details) link:presentationLink link:calculationLink link:definitionLink 2116104 - Disclosure - NET LOSS PER SHARE link:presentationLink link:calculationLink link:definitionLink 2317303 - Disclosure - NET LOSS PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 2418410 - Disclosure - NET LOSS PER SHARE - Schedule of Net Loss Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 2419411 - Disclosure - NET LOSS PER SHARE - Schedule of Potentially Dilutive Securities Excluded from the Calculation of Diluted Earnings Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 2120105 - Disclosure - FAIR VALUE MEASUREMENTS link:presentationLink link:calculationLink link:definitionLink 2421412 - Disclosure - FAIR VALUE MEASUREMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 2122106 - Disclosure - INTANGIBLE ASSETS AND GOODWILL link:presentationLink link:calculationLink link:definitionLink 2323304 - 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Prepaid Expenses and Other Current Assets (Details) link:presentationLink link:calculationLink link:definitionLink 2431418 - Disclosure - BALANCE SHEET COMPONENTS - Property and Equipment, net (Details) link:presentationLink link:calculationLink link:definitionLink 2432419 - Disclosure - BALANCE SHEET COMPONENTS - Other Assets (Details) link:presentationLink link:calculationLink link:definitionLink 2433420 - Disclosure - BALANCE SHEET COMPONENTS - Accrued Expenses and Other Current Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 2434421 - Disclosure - BALANCE SHEET COMPONENTS - Other Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 2135108 - Disclosure - ACQUISITION link:presentationLink link:calculationLink link:definitionLink 2336306 - Disclosure - ACQUISITION (Tables) link:presentationLink link:calculationLink link:definitionLink 2437422 - Disclosure - ACQUISITION - Schedule of Consideration Transferred for the Acquisition (Details) link:presentationLink link:calculationLink link:definitionLink 2438423 - 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Disclosure - REDEEMABLE CONVERTIBLE PREFERRED STOCK, PREFERRED STOCK AND COMMON STOCK link:presentationLink link:calculationLink link:definitionLink 2453432 - Disclosure - REDEEMABLE CONVERTIBLE PREFERRED STOCK, PREFERRED STOCK AND COMMON STOCK (Details) link:presentationLink link:calculationLink link:definitionLink 2154113 - Disclosure - STOCK-BASED COMPENSATION link:presentationLink link:calculationLink link:definitionLink 2355309 - Disclosure - STOCK-BASED COMPENSATION (Tables) link:presentationLink link:calculationLink link:definitionLink 2456433 - Disclosure - STOCK-BASED COMPENSATION - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2457434 - Disclosure - STOCK-BASED COMPENSATION - Shares Available for Future Grant (Details) link:presentationLink link:calculationLink link:definitionLink 2458435 - Disclosure - STOCK-BASED COMPENSATION - Summary of Stock Options Activity (Details) link:presentationLink link:calculationLink link:definitionLink 2459436 - 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Disclosure - DEFINED CONTRIBUTION PLAN AND BENEFIT PLANS - Schedule of Net Periodic Pension Costs (Details) link:presentationLink link:calculationLink link:definitionLink 2474447 - Disclosure - DEFINED CONTRIBUTION PLAN AND BENEFIT PLANS - Schedule of Changes in Benefit Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 2475448 - Disclosure - DEFINED CONTRIBUTION PLAN AND BENEFIT PLANS - Schedule of Weighted-Average Assumptions (Details) link:presentationLink link:calculationLink link:definitionLink 2176116 - Disclosure - RELATED PARTY TRANSACTIONS link:presentationLink link:calculationLink link:definitionLink 2477449 - Disclosure - RELATED PARTY TRANSACTIONS (Details) link:presentationLink link:calculationLink link:definitionLink 2178117 - Disclosure - SEGMENT AND GEOGRAPHIC INFORMATION link:presentationLink link:calculationLink link:definitionLink 2379312 - Disclosure - SEGMENT AND GEOGRAPHIC INFORMATION (Tables) link:presentationLink link:calculationLink link:definitionLink 2480450 - 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