0001001 - Document - COVER PAGE link:presentationLink link:calculationLink link:definitionLink 1001002 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS - UNAUDITED link:presentationLink link:calculationLink link:definitionLink 1002003 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS - UNAUDITED (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 1003004 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - UNAUDITED link:presentationLink link:calculationLink link:definitionLink 1004005 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY - UNAUDITED link:presentationLink link:calculationLink link:definitionLink 1005006 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED link:presentationLink link:calculationLink link:definitionLink 2101101 - Disclosure - NATURE OF BUSINESS link:presentationLink link:calculationLink link:definitionLink 2402401 - Disclosure - NATURE 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 - Cash, Cash Equivalents and Restricted Cash (Details) link:presentationLink link:calculationLink link:definitionLink 2107103 - Disclosure - INVESTMENTS link:presentationLink link:calculationLink link:definitionLink 2308302 - Disclosure - INVESTMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 2409403 - Disclosure - INVESTMENTS - Amortized Cost and Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 2410404 - Disclosure - INVESTMENTS - Other Investments (Details) link:presentationLink link:calculationLink link:definitionLink 2411405 - Disclosure - INVESTMENTS - Unrealized Losses (Details) link:presentationLink link:calculationLink link:definitionLink 2412406 - Disclosure - INVESTMENTS - Gross and Net Realized Gains and Losses (Details) link:presentationLink link:calculationLink link:definitionLink 2413407 - Disclosure - INVESTMENTS - Contractual Maturity (Details) link:presentationLink link:calculationLink link:definitionLink 2414408 - Disclosure - INVESTMENTS - Net Investment Income (Details) link:presentationLink link:calculationLink link:definitionLink 2415409 - Disclosure - INVESTMENTS - Credit Ratings (Details) link:presentationLink link:calculationLink link:definitionLink 2116104 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS link:presentationLink link:calculationLink link:definitionLink 2317303 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 2418410 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - Balance Sheet Grouping (Details) link:presentationLink link:calculationLink link:definitionLink 2419411 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - Long Term Debt (Details) link:presentationLink link:calculationLink link:definitionLink 2120105 - Disclosure - LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES link:presentationLink link:calculationLink link:definitionLink 2321304 - Disclosure - LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES (Tables) link:presentationLink link:calculationLink link:definitionLink 2422412 - Disclosure - LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES (Details) link:presentationLink link:calculationLink link:definitionLink 2423413 - Disclosure - LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2124106 - Disclosure - REINSURANCE link:presentationLink link:calculationLink link:definitionLink 2325305 - Disclosure - REINSURANCE (Tables) link:presentationLink link:calculationLink link:definitionLink 2426414 - Disclosure - REINSURANCE (Details) link:presentationLink link:calculationLink link:definitionLink 2127107 - Disclosure - LONG-TERM DEBT link:presentationLink link:calculationLink link:definitionLink 2328306 - Disclosure - LONG-TERM DEBT (Tables) link:presentationLink link:calculationLink link:definitionLink 2429415 - Disclosure - LONG-TERM DEBT - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2430416 - Disclosure - LONG-TERM DEBT - Schedule Of Debt (Details) link:presentationLink link:calculationLink link:definitionLink 2131108 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 2432417 - Disclosure - INCOME TAXES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2133109 - Disclosure - RESTRUCTURING COSTS link:presentationLink link:calculationLink link:definitionLink 2434418 - Disclosure - RESTRUCTURING COSTS (Details) link:presentationLink link:calculationLink link:definitionLink 2135110 - Disclosure - SHARE-BASED COMPENSATION link:presentationLink link:calculationLink link:definitionLink 2336307 - Disclosure - SHARE-BASED COMPENSATION (Tables) link:presentationLink link:calculationLink link:definitionLink 2437419 - Disclosure - SHARE-BASED COMPENSATION - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2438420 - Disclosure - SHARE-BASED COMPENSATION - Share-based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 2439421 - Disclosure - SHARE-BASED COMPENSATION - RSU Activity (Details) link:presentationLink link:calculationLink link:definitionLink 2440422 - Disclosure - SHARE-BASED COMPENSATION - Option Activity (Details) link:presentationLink link:calculationLink link:definitionLink 2141111 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 2142112 - Disclosure - OTHER COMPREHENSIVE LOSS AND ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME link:presentationLink link:calculationLink link:definitionLink 2343308 - Disclosure - OTHER COMPREHENSIVE LOSS AND ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Tables) link:presentationLink link:calculationLink link:definitionLink 2444423 - Disclosure - OTHER COMPREHENSIVE LOSS AND ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Details) link:presentationLink link:calculationLink link:definitionLink 2145113 - Disclosure - LOSS PER SHARE link:presentationLink link:calculationLink link:definitionLink 2346309 - Disclosure - LOSS PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 2447424 - Disclosure - LOSS PER SHARE (Details) link:presentationLink link:calculationLink link:definitionLink 2448425 - Disclosure - LOSS PER SHARE - Schedule of Anti-Dilutive Securities (Details) link:presentationLink link:calculationLink link:definitionLink 2449426 - Disclosure - LOSS PER SHARE - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2450427 - Disclosure - LOSS PER SHARE - Pro Forma (Details) link:presentationLink link:calculationLink link:definitionLink 2151114 - Disclosure - GEOGRAPHICAL BREAKDOWN OF GROSS WRITTEN PREMIUM link:presentationLink link:calculationLink link:definitionLink 2352310 - Disclosure - GEOGRAPHICAL BREAKDOWN OF GROSS WRITTEN PREMIUM (Tables) link:presentationLink link:calculationLink link:definitionLink 2453428 - Disclosure - GEOGRAPHICAL BREAKDOWN OF GROSS WRITTEN PREMIUM (Details) link:presentationLink link:calculationLink link:definitionLink