0000001 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 0000002 - Statement - Condensed Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 0000003 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 0000004 - Statement - Condensed Consolidated Statements of Loss link:presentationLink link:calculationLink link:definitionLink 0000005 - Statement - Condensed Consolidated Statements of Comprehensive Loss link:presentationLink link:calculationLink link:definitionLink 0000006 - Statement - Condensed Consolidated Statements of Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 0000007 - Statement - Condensed Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 0000008 - Disclosure - DESCRIPTION OF BUSINESS link:presentationLink link:calculationLink link:definitionLink 0000009 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 0000010 - Disclosure - REVENUE link:presentationLink link:calculationLink link:definitionLink 0000011 - Disclosure - NET LOSS PER SHARE link:presentationLink link:calculationLink link:definitionLink 0000012 - Disclosure - Investments link:presentationLink link:calculationLink link:definitionLink 0000013 - Disclosure - FAIR VALUE MEASUREMENTS link:presentationLink link:calculationLink link:definitionLink 0000014 - Disclosure - INTANGIBLE ASSETS AND GOODWILL link:presentationLink link:calculationLink link:definitionLink 0000015 - Disclosure - ACQUISITION link:presentationLink link:calculationLink link:definitionLink 0000016 - Disclosure - LEASES link:presentationLink link:calculationLink link:definitionLink 0000017 - Disclosure - BORROWINGS link:presentationLink link:calculationLink link:definitionLink 0000018 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 0000019 - Disclosure - STOCK-BASED COMPENSATION link:presentationLink link:calculationLink link:definitionLink 0000020 - Disclosure - EQUITY METHOD INVESTMENT link:presentationLink link:calculationLink link:definitionLink 0000021 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 0000022 - Disclosure - RELATED PARTY TRANSACTIONS link:presentationLink link:calculationLink link:definitionLink 9954701 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 9954702 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) link:presentationLink link:calculationLink link:definitionLink 9954703 - Disclosure - REVENUE (Tables) link:presentationLink link:calculationLink link:definitionLink 9954704 - Disclosure - NET LOSS PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 9954705 - Disclosure - Investments (Tables) link:presentationLink link:calculationLink link:definitionLink 9954706 - Disclosure - Fair Value Measures and Disclosures (Tables) link:presentationLink link:calculationLink link:definitionLink 9954707 - Disclosure - INTANGIBLE ASSETS AND GOODWILL (Tables) link:presentationLink link:calculationLink link:definitionLink 9954708 - Disclosure - ACQUISITION (Tables) link:presentationLink link:calculationLink link:definitionLink 9954709 - Disclosure - LEASES (Tables) link:presentationLink link:calculationLink link:definitionLink 9954710 - Disclosure - BORROWINGS (Tables) link:presentationLink link:calculationLink link:definitionLink 9954711 - Disclosure - STOCK-BASED COMPENSATION (Tables) link:presentationLink link:calculationLink link:definitionLink 9954712 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954713 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable Concentration Risk (Details) link:presentationLink link:calculationLink link:definitionLink 9954714 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Concentration Risk (Details) link:presentationLink link:calculationLink link:definitionLink 9954715 - Disclosure - REVENUE - Disaggregation of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9954716 - Disclosure - REVENUE - Contract Balances on Condensed Consolidated Balance Sheet (Details) link:presentationLink link:calculationLink link:definitionLink 9954717 - Disclosure - REVENUE - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954717 - Disclosure - REVENUE - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954718 - Disclosure - REVENUE - Capitalized Direct Commission Costs (Details) link:presentationLink link:calculationLink link:definitionLink 9954719 - Disclosure - NET LOSS PER SHARE - Schedule of Net Loss Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 9954720 - 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 9954721 - Disclosure - Investments - Debt Securities, Available-for-sale (Details) link:presentationLink link:calculationLink link:definitionLink 9954722 - Disclosure - Investments - Debt Securities, Held-to-maturity, Nonacrrual (Details) link:presentationLink link:calculationLink link:definitionLink 9954723 - Disclosure - FAIR VALUE MEASUREMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 9954724 - Disclosure - FAIR VALUE MEASUREMENTS - Fair Value, Assets Measured on Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 9954725 - Disclosure - INTANGIBLE ASSETS AND GOODWILL - Schedule of Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9954726 - Disclosure - INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954727 - Disclosure - INTANGIBLE ASSETS AND GOODWILL - Schedule of Future Amortization Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9954728 - Disclosure - ACQUISITION - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954729 - Disclosure - ACQUISITION - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) link:presentationLink link:calculationLink link:definitionLink 9954730 - Disclosure - LEASES - Operating Lease Costs (Details) link:presentationLink link:calculationLink link:definitionLink 9954731 - Disclosure - LEASES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954732 - Disclosure - LEASES - Maturities of Operating Lease Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9954732 - Disclosure - LEASES - Maturities of Operating Lease Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9954733 - Disclosure - BORROWINGS - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954734 - Disclosure - BORROWINGS - Schedule of Vendor Financing Arrangements (Details) link:presentationLink link:calculationLink link:definitionLink 9954734 - Disclosure - BORROWINGS - Schedule of Vendor Financing Arrangements (Details) link:presentationLink link:calculationLink link:definitionLink 9954735 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details) link:presentationLink link:calculationLink link:definitionLink 9954736 - Disclosure - STOCK-BASED COMPENSATION - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954737 - Disclosure - STOCK-BASED COMPENSATION - Shares Available for Future Grant (Details) link:presentationLink link:calculationLink link:definitionLink 9954738 - Disclosure - STOCK-BASED COMPENSATION - Summary of Stock Options Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9954739 - Disclosure - STOCK-BASED COMPENSATION - Stock Options Valuations Assumptions (Details) link:presentationLink link:calculationLink link:definitionLink 9954740 - Disclosure - STOCK-BASED COMPENSATION - Summary of Restricted Stock Units Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9954741 - Disclosure - STOCK-BASED COMPENSATION - Stock-Based Compensation Related to Stock-Based Awards to Employees (Details) link:presentationLink link:calculationLink link:definitionLink 9954742 - Disclosure - EQUITY METHOD INVESTMENT (Details) link:presentationLink link:calculationLink link:definitionLink 9954743 - Disclosure - INCOME TAXES (Details) link:presentationLink link:calculationLink link:definitionLink 9954744 - Disclosure - RELATED PARTY TRANSACTIONS (Details) link:presentationLink link:calculationLink link:definitionLink