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 AND COMPREHENSIVE LOSS link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 9952156 - Disclosure - Nature of the Business link:presentationLink link:calculationLink link:definitionLink 9952157 - Disclosure - Basis of Presentation link:presentationLink link:calculationLink link:definitionLink 9952158 - Disclosure - Use of Estimates link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - Investments link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - Unpaid Loss and Loss Adjustment Expense link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - Borrowings under Financing Agreement link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - Other Liabilities and Accrued Expenses link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - Stock-based Compensation link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 9952168 - Disclosure - Net Loss per Share link:presentationLink link:calculationLink link:definitionLink 9952169 - Disclosure - Related Party Transactions link:presentationLink link:calculationLink link:definitionLink 9952170 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 9952171 - Disclosure - Segment Information link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - Summary of Significant Accounting Policies (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - Investments (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - Unpaid Loss and Loss Adjustment Expense (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - Other Liabilities and Accrued Expenses (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - Stock-based Compensation (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - Net Loss per Share (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - Segment Information (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - Nature of the Business (Details) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - Investments - Amortized Cost and Fair Values of Investment in Fixed Maturities (Details) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - Investments - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - Investments - Contractual Maturities of Bonds (Details) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Investments - Net Investment Income (Details) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - Investments - Aging of Gross Unrealized Losses (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - Fair Value Measurements - Fair Value Hierarchy for Financial Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - Unpaid Loss and Loss Adjustment Expense - Activity in the Liability for Unpaid Loss and LAE (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Unpaid Loss and Loss Adjustment Expense - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Unpaid Loss and Loss Adjustment Expense - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - Borrowings under Financing Agreement (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Other Liabilities and Accrued Expenses (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - Stockholders' Equity (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - Stock-based Compensation - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Stock-based Compensation - Fair Value Assumptions (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Stock-based Compensation - Stock Options Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Stock-based Compensation - Restricted Stock Units Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Stock-based Compensation - Stock-based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Stock-based Compensation - Stock-based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - Net Loss per Share - Basic and Diluted Net Loss per Share (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - Net Loss per Share - Antidilutive Potential Common Shares (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - Related Party Transactions (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - Commitments and Contingencies (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - Segment Information - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - Segment Information - Schedule of Segment Reporting Information, by Segment (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - Segment Information - Schedule of Gross Written Premium by State (Details) link:presentationLink link:calculationLink link:definitionLink