0001001 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 1001002 - Statement - Unaudited Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 1002003 - Statement - Unaudited Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 1003004 - Statement - Unaudited Consolidated Statements of Operations link:presentationLink link:calculationLink link:definitionLink 1004005 - Statement - Unaudited Consolidated Statements of Changes in Stockholders' Deficit link:presentationLink link:calculationLink link:definitionLink 1005006 - Statement - Unaudited Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 2101101 - Disclosure - NATURE OF BUSINESS AND ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 2202201 - Disclosure - NATURE OF BUSINESS AND ACCOUNTING POLICIES - (Policies) link:presentationLink link:calculationLink link:definitionLink 2303301 - Disclosure - NATURE OF BUSINESS AND ACCOUNTING POLICIES (Tables) link:presentationLink link:calculationLink link:definitionLink 2404401 - Disclosure - NATURE OF BUSINESS AND ACCOUNTING POLICIES - Revision of Cash Flow Changes (Details) link:presentationLink link:calculationLink link:definitionLink 2105102 - Disclosure - REVENUES link:presentationLink link:calculationLink link:definitionLink 2306302 - Disclosure - REVENUES (Tables) link:presentationLink link:calculationLink link:definitionLink 2407402 - Disclosure - REVENUES - Disaggregation of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 2408403 - Disclosure - REVENUES - Contract with Customer Liability (Details) link:presentationLink link:calculationLink link:definitionLink 2409404 - Disclosure - REVENUES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2409404 - Disclosure - REVENUES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2110103 - Disclosure - ACQUISITIONS link:presentationLink link:calculationLink link:definitionLink 2311303 - Disclosure - ACQUISITIONS (Tables) link:presentationLink link:calculationLink link:definitionLink 2412405 - Disclosure - ACQUISITIONS - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2413406 - Disclosure - ACQUISITIONS - Schedule of Acquisition (Details) link:presentationLink link:calculationLink link:definitionLink 2414407 - Disclosure - ACQUISITIONS - Purchase Price Allocation (Details) link:presentationLink link:calculationLink link:definitionLink 2115104 - Disclosure - SETTLEMENT ASSETS AND CUSTOMER ACCOUNT BALANCES AND RELATED OBLIGATIONS link:presentationLink link:calculationLink link:definitionLink 2316304 - Disclosure - SETTLEMENT ASSETS AND CUSTOMER ACCOUNT BALANCES AND RELATED OBLIGATIONS (Tables) link:presentationLink link:calculationLink link:definitionLink 2417408 - Disclosure - SETTLEMENT ASSETS AND CUSTOMER ACCOUNT BALANCES AND RELATED OBLIGATIONS - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2418409 - Disclosure - SETTLEMENT ASSETS AND CUSTOMER ACCOUNT BALANCES AND RELATED OBLIGATIONS - Schedule of Settlement Assets and Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 2119105 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS link:presentationLink link:calculationLink link:definitionLink 2320305 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - (Tables) link:presentationLink link:calculationLink link:definitionLink 2421410 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill Allocation (Details) link:presentationLink link:calculationLink link:definitionLink 2422411 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 2423412 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2124106 - Disclosure - PROPERTY, EQUIPMENT AND SOFTWARE link:presentationLink link:calculationLink link:definitionLink 2325306 - Disclosure - PROPERTY, EQUIPMENT AND SOFTWARE - (Tables) link:presentationLink link:calculationLink link:definitionLink 2426413 - Disclosure - PROPERTY, EQUIPMENT AND SOFTWARE - (Details) link:presentationLink link:calculationLink link:definitionLink 2127107 - Disclosure - NOTES RECEIVABLE link:presentationLink link:calculationLink link:definitionLink 2328307 - Disclosure - NOTES RECEIVABLE - (Tables) link:presentationLink link:calculationLink link:definitionLink 2429414 - Disclosure - NOTES RECEIVABLE - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2430415 - Disclosure - NOTES RECEIVABLE - Schedule of Principal Payments to be Received (Details) link:presentationLink link:calculationLink link:definitionLink 2131108 - Disclosure - DEBT OBLIGATIONS link:presentationLink link:calculationLink link:definitionLink 2332308 - Disclosure - DEBT OBLIGATIONS (Tables) link:presentationLink link:calculationLink link:definitionLink 2433416 - Disclosure - DEBT OBLIGATIONS - Schedule of Long-Term Debt (Details) link:presentationLink link:calculationLink link:definitionLink 2434417 - Disclosure - DEBT OBLIGATIONS - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2135109 - Disclosure - FAIR VALUE link:presentationLink link:calculationLink link:definitionLink 2336309 - Disclosure - Fair Value Measures and Disclosures (Tables) link:presentationLink link:calculationLink link:definitionLink 2437418 - Disclosure - FAIR VALUE - Contingent Consideration Current and Non-Current Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 2438419 - Disclosure - FAIR VALUE - Contingent Consideration Liability Rollforward (Details) link:presentationLink link:calculationLink link:definitionLink 2439420 - Disclosure - FAIR VALUE - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2140110 - Disclosure - REDEEMABLE SENIOR PREFERRED STOCK AND WARRANTS link:presentationLink link:calculationLink link:definitionLink 2341310 - Disclosure - REDEEMABLE SENIOR PREFERRED STOCK AND WARRANTS (Tables) link:presentationLink link:calculationLink link:definitionLink 2442421 - Disclosure - REDEEMABLE SENIOR PREFERRED STOCK AND WARRANTS - Reconciliation of Temporary Equity (Details) link:presentationLink link:calculationLink link:definitionLink 2443422 - Disclosure - REDEEMABLE SENIOR PREFERRED STOCK AND WARRANTS - Schedule of Dividends (Details) link:presentationLink link:calculationLink link:definitionLink 2444423 - Disclosure - REDEEMABLE SENIOR PREFERRED STOCK AND WARRANTS - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2145111 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 2446424 - Disclosure - INCOME TAXES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2147112 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 2448425 - Disclosure - COMMITMENTS AND CONTINGENCIES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2149113 - Disclosure - RELATED PARTY TRANSACTIONS link:presentationLink link:calculationLink link:definitionLink 2450426 - Disclosure - RELATED PARTY TRANSACTIONS - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2151114 - Disclosure - STOCK-BASED COMPENSATION link:presentationLink link:calculationLink link:definitionLink 2352311 - Disclosure - STOCK-BASED COMPENSATION - (Tables) link:presentationLink link:calculationLink link:definitionLink 2453427 - Disclosure - STOCK-BASED COMPENSATION - Schedule of Equity-Based Compensation (Details) link:presentationLink link:calculationLink link:definitionLink 2454428 - Disclosure - STOCK-BASED COMPENSATION - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2155115 - Disclosure - STOCKHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 2456429 - Disclosure - STOCKHOLDERS' EQUITY - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2157116 - Disclosure - SEGMENT INFORMATION link:presentationLink link:calculationLink link:definitionLink 2358312 - Disclosure - SEGMENT INFORMATION - (Tables) link:presentationLink link:calculationLink link:definitionLink 2459430 - Disclosure - SEGMENT INFORMATION - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2460431 - Disclosure - SEGMENT INFORMATION - Schedule of Segment Reporting Information by Segment (Details) link:presentationLink link:calculationLink link:definitionLink 2461432 - Disclosure - SEGMENT INFORMATION - Reconciliation of Total Operating Income (Details) link:presentationLink link:calculationLink link:definitionLink 2162117 - Disclosure - LOSS PER COMMON SHARE link:presentationLink link:calculationLink link:definitionLink 2363313 - Disclosure - LOSS PER COMMON SHARE - (Tables) link:presentationLink link:calculationLink link:definitionLink 2464433 - Disclosure - LOSS PER COMMON SHARE - Schedule of Earnings Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 2465434 - Disclosure - LOSS PER COMMON SHARE - Schedule of Antidilutive Securities (Details) link:presentationLink link:calculationLink link:definitionLink