1001 - Document - Cover Page link:presentationLink link:definitionLink link:calculationLink 1002 - Statement - Condensed Consolidated Balance Sheets link:presentationLink link:definitionLink link:calculationLink 1003 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) link:presentationLink link:definitionLink link:calculationLink 1004 - Statement - Condensed Consolidated Statements of Operations and Comprehensive Loss link:presentationLink link:definitionLink link:calculationLink 1005 - Statement - Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Deficit link:presentationLink link:definitionLink link:calculationLink 1006 - Statement - Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Deficit (Parenthetical) link:presentationLink link:definitionLink link:calculationLink 1007 - Statement - Condensed Consolidated Statements of Cash Flows link:presentationLink link:definitionLink link:calculationLink 1008 - Disclosure - The Company and Liquidity link:presentationLink link:definitionLink link:calculationLink 1009 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies link:presentationLink link:definitionLink link:calculationLink 1010 - Disclosure - Fair Value Measurements link:presentationLink link:definitionLink link:calculationLink 1011 - Disclosure - Investments link:presentationLink link:definitionLink link:calculationLink 1012 - Disclosure - Restricted Cash link:presentationLink link:definitionLink link:calculationLink 1013 - Disclosure - Property and Equipment, Net link:presentationLink link:definitionLink link:calculationLink 1014 - Disclosure - Accrued Expenses and Other Current Liabilities link:presentationLink link:definitionLink link:calculationLink 1015 - Disclosure - SVB Agreement link:presentationLink link:definitionLink link:calculationLink 1016 - Disclosure - Common Stock link:presentationLink link:definitionLink link:calculationLink 1017 - Disclosure - Preferred Stock link:presentationLink link:definitionLink link:calculationLink 1018 - Disclosure - Stock-based Compensation link:presentationLink link:definitionLink link:calculationLink 1019 - Disclosure - Leases link:presentationLink link:definitionLink link:calculationLink 1020 - Disclosure - Genevant Agreement link:presentationLink link:definitionLink link:calculationLink 1021 - Disclosure - Income Taxes link:presentationLink link:definitionLink link:calculationLink 1022 - Disclosure - Commitments and Contingencies link:presentationLink link:definitionLink link:calculationLink 1023 - Disclosure - 401(k) Savings Plan link:presentationLink link:definitionLink link:calculationLink 1024 - Disclosure - Related Party Transactions link:presentationLink link:definitionLink link:calculationLink 1025 - Disclosure - Net Loss Per Share link:presentationLink link:definitionLink link:calculationLink 1026 - Disclosure - Subsequent Events link:presentationLink link:definitionLink link:calculationLink 1027 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Policies) link:presentationLink link:definitionLink link:calculationLink 1028 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Tables) link:presentationLink link:definitionLink link:calculationLink 1029 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:definitionLink link:calculationLink 1030 - Disclosure - Investments (Tables) link:presentationLink link:definitionLink link:calculationLink 1031 - Disclosure - Restricted Cash (Tables) link:presentationLink link:definitionLink link:calculationLink 1032 - Disclosure - Property and Equipment, Net (Tables) link:presentationLink link:definitionLink link:calculationLink 1033 - Disclosure - Accrued Expenses and Other Current Liabilities (Tables) link:presentationLink link:definitionLink link:calculationLink 1034 - Disclosure - SVB Agreement (Tables) link:presentationLink link:definitionLink link:calculationLink 1035 - Disclosure - Common Stock (Tables) link:presentationLink link:definitionLink link:calculationLink 1036 - Disclosure - Stock-based Compensation (Tables) link:presentationLink link:definitionLink link:calculationLink 1037 - Disclosure - Income Taxes (Tables) link:presentationLink link:definitionLink link:calculationLink 1038 - Disclosure - Commitments and Contingencies (Tables) link:presentationLink link:definitionLink link:calculationLink 1039 - Disclosure - Leases (Tables) link:presentationLink link:definitionLink link:calculationLink 1040 - Disclosure - Net Loss Per Share (Tables) link:presentationLink link:definitionLink link:calculationLink 1041 - Disclosure - The Company and Liquidity - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1042 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1043 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies - Summary of Financial Statement Line Item Affected by the Adoption of ASC 842 (Detail) link:presentationLink link:definitionLink link:calculationLink 1044 - Disclosure - Fair Value Measurements - Summary of Assets Measured at Fair Value on a Recurring Basis (Detail) link:presentationLink link:definitionLink link:calculationLink 1045 - Disclosure - Fair Value Measurements - Summary of Reconciliation of the Preferred Stock Tranche Liability (Detail) link:presentationLink link:definitionLink link:calculationLink 1046 - Disclosure - Fair Value Measurements - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1047 - Disclosure - Investments - Summary of Short Term Investments and Cash Equivalents (Detail) link:presentationLink link:definitionLink link:calculationLink 1048 - Disclosure - Investments - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1049 - Disclosure - Restricted Cash - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1050 - Disclosure - Restricted Cash - Summary of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail) link:presentationLink link:definitionLink link:calculationLink 1051 - Disclosure - Property and Equipment, Net - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1052 - Disclosure - Property and Equipment, Net - Summary of Property Plant and Equipment Net (Detail) link:presentationLink link:definitionLink link:calculationLink 1053 - Disclosure - Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Detail) link:presentationLink link:definitionLink link:calculationLink 1054 - Disclosure - SVB Agreement - Schedule of Determine the Fair Value of the Warrant Upon Issuance (Detail) link:presentationLink link:definitionLink link:calculationLink 1055 - Disclosure - SVB Agreement - Additional information (Detail) link:presentationLink link:definitionLink link:calculationLink 1056 - Disclosure - Common Stock - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1057 - Disclosure - Common Stock - Schedule of Reserved for Future Issuance (Detail) link:presentationLink link:definitionLink link:calculationLink 1058 - Disclosure - Preferred Stock - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1059 - Disclosure - Stock-based Compensation - Summary of Components of Stock-Based Compensation Expense Recognized (Detail) link:presentationLink link:definitionLink link:calculationLink 1060 - Disclosure - Stock-based Compensation - Summary of Activity under RSU Plans (Detail) link:presentationLink link:definitionLink link:calculationLink 1061 - Disclosure - Stock-based Compensation - Summary of Fair Value Assumptions on Stock Options Granted (Detail) link:presentationLink link:definitionLink link:calculationLink 1062 - Disclosure - Stock-based Compensation - Summary of Activity under Stock Option Plans (Detail) link:presentationLink link:definitionLink link:calculationLink 1063 - Disclosure - Stock-based Compensation - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1064 - Disclosure - Genevant Agreement - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1065 - Disclosure - Leases - Summary of Future Operating Lease Payments Due (Detail) link:presentationLink link:definitionLink link:calculationLink 1066 - Disclosure - Leases - Summary of Lease Cost (Detail) link:presentationLink link:definitionLink link:calculationLink 1067 - Disclosure - Leases - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1068 - Disclosure - Income Taxes - Summary of Provision (Detail) link:presentationLink link:definitionLink link:calculationLink 1069 - Disclosure - Income Taxes - Summary of Reconciliation of U.S. Federal Statutory Income Tax Rate (Detail) link:presentationLink link:definitionLink link:calculationLink 1070 - Disclosure - Income Taxes - Summary of Deferred Tax Assets (Detail) link:presentationLink link:definitionLink link:calculationLink 1071 - Disclosure - Income Taxes - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1072 - Disclosure - Commitments and Contingencies - Summary of Future Minimum Operating Lease Liabilities (Detail) link:presentationLink link:definitionLink link:calculationLink 1073 - Disclosure - Commitments and Contingencies - Summary of Future Operating Lease Liability (Detail) link:presentationLink link:definitionLink link:calculationLink 1074 - Disclosure - Commitments and Contingencies - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1075 - Disclosure - 401(k) Savings Plan - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1076 - Disclosure - Related Party Transactions - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1077 - Disclosure - Net Loss Per Share - Summary of Computation of Diluted Net Loss Per Share (Detail) link:presentationLink link:definitionLink link:calculationLink 1078 - Disclosure - Subsequent Events - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink