0000001 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 0000002 - Document - Audit Information link:presentationLink link:calculationLink link:definitionLink 0000003 - Statement - Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 0000004 - Statement - Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 0000005 - Statement - Consolidated Statements of Loss link:presentationLink link:calculationLink link:definitionLink 0000006 - Statement - Consolidated Statements of Comprehensive Loss link:presentationLink link:calculationLink link:definitionLink 0000007 - Statement - Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders’ Equity (Deficit) link:presentationLink link:calculationLink link:definitionLink 0000008 - Statement - Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 0000009 - Disclosure - DESCRIPTION OF BUSINESS link:presentationLink link:calculationLink link:definitionLink 0000010 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 0000011 - Disclosure - REVENUE link:presentationLink link:calculationLink link:definitionLink 0000012 - Disclosure - NET LOSS PER SHARE link:presentationLink link:calculationLink link:definitionLink 0000013 - Disclosure - INVESTMENTS link:presentationLink link:calculationLink link:definitionLink 0000014 - Disclosure - FAIR VALUE MEASUREMENTS link:presentationLink link:calculationLink link:definitionLink 0000015 - Disclosure - INTANGIBLE ASSETS AND GOODWILL link:presentationLink link:calculationLink link:definitionLink 0000016 - Disclosure - BALANCE SHEET COMPONENTS link:presentationLink link:calculationLink link:definitionLink 0000017 - Disclosure - ACQUISITION link:presentationLink link:calculationLink link:definitionLink 0000018 - Disclosure - LEASES link:presentationLink link:calculationLink link:definitionLink 0000019 - Disclosure - BORROWINGS link:presentationLink link:calculationLink link:definitionLink 0000020 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 0000021 - Disclosure - REDEEMABLE CONVERTIBLE PREFERRED STOCK, PREFERRED STOCK AND COMMON STOCK link:presentationLink link:calculationLink link:definitionLink 0000022 - Disclosure - STOCK-BASED COMPENSATION link:presentationLink link:calculationLink link:definitionLink 0000023 - Disclosure - EQUITY METHOD INVESTMENT link:presentationLink link:calculationLink link:definitionLink 0000024 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 0000025 - Disclosure - DEFINED CONTRIBUTION PLAN AND BENEFIT PLANS link:presentationLink link:calculationLink link:definitionLink 0000026 - Disclosure - RELATED PARTY TRANSACTIONS link:presentationLink link:calculationLink link:definitionLink 0000027 - Disclosure - SEGMENT AND GEOGRAPHIC INFORMATION link:presentationLink link:calculationLink link:definitionLink 0000028 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 0000029 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) link:presentationLink link:calculationLink link:definitionLink 0000030 - Disclosure - REVENUE (Tables) link:presentationLink link:calculationLink link:definitionLink 0000031 - Disclosure - NET LOSS PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 0000032 - Disclosure - Investments, Debt and Equity Securities (Tables) link:presentationLink link:calculationLink link:definitionLink 0000033 - Disclosure - FAIR VALUE MEASUREMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 0000034 - Disclosure - INTANGIBLE ASSETS AND GOODWILL (Tables) link:presentationLink link:calculationLink link:definitionLink 0000035 - Disclosure - BALANCE SHEET COMPONENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 0000036 - Disclosure - ACQUISITION (Tables) link:presentationLink link:calculationLink link:definitionLink 0000037 - Disclosure - LEASES (Tables) link:presentationLink link:calculationLink link:definitionLink 0000038 - Disclosure - BORROWINGS (Tables) link:presentationLink link:calculationLink link:definitionLink 0000039 - Disclosure - STOCK-BASED COMPENSATION (Tables) link:presentationLink link:calculationLink link:definitionLink 0000040 - Disclosure - INCOME TAXES (Tables) link:presentationLink link:calculationLink link:definitionLink 0000041 - Disclosure - DEFINED CONTRIBUTION PLAN AND BENEFIT PLANS (Tables) link:presentationLink link:calculationLink link:definitionLink 0000042 - Disclosure - SEGMENT AND GEOGRAPHIC INFORMATION (Tables) link:presentationLink link:calculationLink link:definitionLink 0000043 - Disclosure - DESCRIPTION OF BUSINESS (Details) link:presentationLink link:calculationLink link:definitionLink 0000044 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable Concentration Risk (Details) link:presentationLink link:calculationLink link:definitionLink 0000045 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000046 - Disclosure - REVENUE - Disaggregation of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 0000047 - Disclosure - REVENUE - Contract Balances on Condensed Consolidated Balance Sheet (Details) link:presentationLink link:calculationLink link:definitionLink 0000048 - Disclosure - REVENUE - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000048 - Disclosure - REVENUE - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000049 - Disclosure - REVENUE - Roll Forward of Deferred Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 0000050 - Disclosure - REVENUE - Capitalized Direct Commission Costs (Details) link:presentationLink link:calculationLink link:definitionLink 0000051 - Disclosure - NET LOSS PER SHARE - Schedule of Net Loss Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 0000052 - 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 0000053 - Disclosure - INVESTMENTS - Debt Securities, Available-for-sale (Details) link:presentationLink link:calculationLink link:definitionLink 0000054 - Disclosure - INVESTMENTS - Investments, Maturity Schedule (Details) link:presentationLink link:calculationLink link:definitionLink 0000055 - Disclosure - FAIR VALUE MEASUREMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 0000056 - Disclosure - FAIR VALUE MEASUREMENTS - Fair Value, Assets Measured on Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 0000057 - Disclosure - INTANGIBLE ASSETS AND GOODWILL - Schedule of Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 0000058 - Disclosure - INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000059 - Disclosure - INTANGIBLE ASSETS AND GOODWILL - Schedule of Future Amortization Expense (Details) link:presentationLink link:calculationLink link:definitionLink 0000060 - Disclosure - BALANCE SHEET COMPONENTS - Accounts Receivable, net (Details) link:presentationLink link:calculationLink link:definitionLink 0000061 - Disclosure - BALANCE SHEET COMPONENTS - Prepaid Expenses and Other Current Assets (Details) link:presentationLink link:calculationLink link:definitionLink 0000062 - Disclosure - BALANCE SHEET COMPONENTS - Property and Equipment, net (Details) link:presentationLink link:calculationLink link:definitionLink 0000063 - Disclosure - BALANCE SHEET COMPONENTS - Other Assets (Details) link:presentationLink link:calculationLink link:definitionLink 0000064 - Disclosure - BALANCE SHEET COMPONENTS - Accrued Expenses and Other Current Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 0000065 - Disclosure - BALANCE SHEET COMPONENTS - Other Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 0000066 - Disclosure - ACQUISITION - Schedule of Consideration Transferred for the Acquisition (Details) link:presentationLink link:calculationLink link:definitionLink 0000067 - Disclosure - ACQUISITION - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000068 - Disclosure - ACQUISITION - Summary of Preliminary Estimated Fair Values of the Identifiable Assets Acquired and Liabilities Assumed (Details) link:presentationLink link:calculationLink link:definitionLink 0000069 - Disclosure - ACQUISITION - Summary of Fair Value of the Identifiable Intangible Assets Acquired (Details) link:presentationLink link:calculationLink link:definitionLink 0000070 - Disclosure - LEASES - Operating Lease Costs (Details) link:presentationLink link:calculationLink link:definitionLink 0000071 - Disclosure - LEASES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000072 - Disclosure - LEASES - Maturities of Operating Lease Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 0000072 - Disclosure - LEASES - Maturities of Operating Lease Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 0000073 - Disclosure - BORROWINGS - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000074 - Disclosure - BORROWINGS - Schedule of Vendor Financing Arrangements (Details) link:presentationLink link:calculationLink link:definitionLink 0000074 - Disclosure - BORROWINGS - Schedule of Vendor Financing Arrangements (Details) link:presentationLink link:calculationLink link:definitionLink 0000075 - Disclosure - REDEEMABLE CONVERTIBLE PREFERRED STOCK, PREFERRED STOCK AND COMMON STOCK (Details) link:presentationLink link:calculationLink link:definitionLink 0000076 - Disclosure - STOCK-BASED COMPENSATION - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000077 - Disclosure - STOCK-BASED COMPENSATION - Shares Available for Future Grant (Details) link:presentationLink link:calculationLink link:definitionLink 0000078 - Disclosure - STOCK-BASED COMPENSATION - Summary of Stock Options Activity (Details) link:presentationLink link:calculationLink link:definitionLink 0000079 - Disclosure - STOCK-BASED COMPENSATION - Summary of Restricted Stock Units and Awards Activity (Details) link:presentationLink link:calculationLink link:definitionLink 0000080 - Disclosure - STOCK-BASED COMPENSATION - Stock-Based Compensation Related to Stock-Based Awards to Employees (Details) link:presentationLink link:calculationLink link:definitionLink 0000081 - Disclosure - EQUITY METHOD INVESTMENT (Details) link:presentationLink link:calculationLink link:definitionLink 0000082 - Disclosure - INCOME TAXES - Schedule of Income (Loss) Before Provision for Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 0000083 - Disclosure - INCOME TAXES - Schedule of Provision for Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 0000084 - Disclosure - INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 0000085 - Disclosure - INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 0000086 - Disclosure - INCOME TAXES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000087 - Disclosure - INCOME TAXES - Schedule of Unrecognized Tax Benefits (Details) link:presentationLink link:calculationLink link:definitionLink 0000088 - Disclosure - DEFINED CONTRIBUTION PLAN AND BENEFIT PLANS - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000089 - Disclosure - DEFINED CONTRIBUTION PLAN AND BENEFIT PLANS - Schedule of Net Periodic Pension Costs (Details) link:presentationLink link:calculationLink link:definitionLink 0000090 - Disclosure - DEFINED CONTRIBUTION PLAN AND BENEFIT PLANS - Schedule of Changes in Benefit Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 0000091 - Disclosure - DEFINED CONTRIBUTION PLAN AND BENEFIT PLANS - Schedule of Weighted-Average Assumptions (Details) link:presentationLink link:calculationLink link:definitionLink 0000092 - Disclosure - RELATED PARTY TRANSACTIONS (Details) link:presentationLink link:calculationLink link:definitionLink 0000093 - Disclosure - SEGMENT AND GEOGRAPHIC INFORMATION - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000094 - Disclosure - SEGMENT AND GEOGRAPHIC INFORMATION - Summary of Revenue by Geographic Area (Details) link:presentationLink link:calculationLink link:definitionLink 0000095 - Disclosure - SEGMENT AND GEOGRAPHIC INFORMATION - Summary of Property and Equipment by Geographic Area (Details) link:presentationLink link:calculationLink link:definitionLink