0000001 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - Condensed Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - Condensed Consolidated Statements of Operations link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - Condensed Consolidated Statements of Comprehensive Loss link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - Condensed Consolidated Statements of Stockholders' Equity (Deficit) link:presentationLink link:calculationLink link:definitionLink 9952156 - Statement - Condensed Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 9952157 - Disclosure - DESCRIPTION OF BUSINESS link:presentationLink link:calculationLink link:definitionLink 9952158 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - REVENUE link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - NET LOSS PER SHARE link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - INVESTMENTS link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - FAIR VALUE MEASUREMENTS link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - BUSINESS COMBINATION link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - INTANGIBLE ASSETS AND GOODWILL link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - LEASES link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - BORROWINGS link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 9952168 - Disclosure - COMMON STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) link:presentationLink link:calculationLink link:definitionLink 9952169 - Disclosure - STOCK-BASED COMPENSATION PLANS AND STOCK-BASED COMPENSATION link:presentationLink link:calculationLink link:definitionLink 9952170 - Disclosure - EQUITY METHOD INVESTMENT link:presentationLink link:calculationLink link:definitionLink 9952171 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 9952172 - Disclosure - RELATED PARTY TRANSACTIONS link:presentationLink link:calculationLink link:definitionLink 9952173 - Disclosure - SEGMENT AND GEOGRAPHIC INFORMATION link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - REVENUE (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - NET LOSS PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - INVESTMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - FAIR VALUE MEASUREMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - BUSINESS COMBINATION (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - INTANGIBLE ASSETS AND GOODWILL (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - LEASES (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - BORROWINGS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - STOCK-BASED COMPENSATION PLANS AND STOCK-BASED COMPENSATION (Tables) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Accounts Receivable Concentration Risk (Details) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Revenue Concentration Risk (Details) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - REVENUE - Disaggregation of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - REVENUE - Contract Balances on Condensed Consolidated Balance Sheet (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - REVENUE - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - REVENUE - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - REVENUE - Capitalized Direct Commission Costs (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - NET LOSS PER SHARE - Schedule of Net Loss Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - 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 9955531 - Disclosure - INVESTMENTS - Debt Securities, Available-for-sale (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - INVESTMENTS - Debt Securities, Held-to-maturity, Nonaccrual (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - INVESTMENTS - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - FAIR VALUE MEASUREMENTS - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - FAIR VALUE MEASUREMENTS - Fair Value, Assets Measured on Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - BUSINESS COMBINATION - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - BUSINESS COMBINATION - Schedule of Consideration Transferred for Acquisition (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - BUSINESS COMBINATION - Schedule of Identifiable Assets Acquired and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - BUSINESS COMBINATION - Schedule of Weighted-average Useful Life (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - INTANGIBLE ASSETS AND GOODWILL - Schedule of Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - INTANGIBLE ASSETS AND GOODWILL - Schedule of Future Amortization Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - LEASES - Operating Lease Costs (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - LEASES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - LEASES - Maturities of Operating Lease Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - LEASES - Maturities of Operating Lease Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - BORROWINGS - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - BORROWINGS - Schedule of Vendor Financing Arrangements (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - BORROWINGS - Schedule of Vendor Financing Arrangements (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - COMMON STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) (Details) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - STOCK-BASED COMPENSATION PLANS AND STOCK-BASED COMPENSATION - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955551 - Disclosure - STOCK-BASED COMPENSATION PLANS AND STOCK-BASED COMPENSATION - Schedule of Restricted and Performance Stock Units and Awards Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9955552 - Disclosure - STOCK-BASED COMPENSATION PLANS AND STOCK-BASED COMPENSATION - Schedule of Stock-Based Compensation Related to Stock-Based Awards to Employees (Details) link:presentationLink link:calculationLink link:definitionLink 9955553 - Disclosure - EQUITY METHOD INVESTMENT (Details) link:presentationLink link:calculationLink link:definitionLink 9955554 - Disclosure - INCOME TAXES (Details) link:presentationLink link:calculationLink link:definitionLink 9955555 - Disclosure - RELATED PARTY TRANSACTIONS (Details) link:presentationLink link:calculationLink link:definitionLink 9955556 - Disclosure - SEGMENT AND GEOGRAPHIC INFORMATION (Details) link:presentationLink link:calculationLink link:definitionLink