0000001 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - Condensed Consolidated Statements of Operations link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - Condensed Consolidated Statements of Operations (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - Condensed Consolidated Statements of Comprehensive Loss link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - Condensed Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952156 - Statement - Condensed Consolidated Statements of Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 9952157 - Statement - Condensed Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 9952158 - Statement - Condensed Consolidated Statements of Cash Flows (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - Organization, Liquidity and Capital Resources link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - Related Party - Gilead Sciences, Inc. link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - License and Collaborations link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - Revenues link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - Net Loss Per Share link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - Stock-Based Compensation link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - Cash, Cash Equivalents and Marketable Securities link:presentationLink link:calculationLink link:definitionLink 9952168 - Disclosure - Condensed Consolidated Balance Sheet Components link:presentationLink link:calculationLink link:definitionLink 9952169 - Disclosure - Long-Term Debt link:presentationLink link:calculationLink link:definitionLink 9952170 - Disclosure - Leases link:presentationLink link:calculationLink link:definitionLink 9952171 - Disclosure - Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 9952172 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 9952173 - Disclosure - Business Segment link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - Revenues (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - Net Loss Per Share (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - Stock-Based Compensation (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - Cash, Cash Equivalents and Marketable Securities (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - Condensed Consolidated Balance Sheet Components (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - Long-Term Debt (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - Leases (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - Business Segment (Tables) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - Organization, Liquidity and Capital Resources - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - Related Party - Gilead Sciences, Inc. (Details) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - License and Collaborations (Details) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - Revenues - Summary of Revenues by Collaboration, Category of Revenue and Method of Recognition (Details) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Revenues - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - Revenues - Summary of Revenue Recognized as a Result of Changes in Deferred Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - Revenues - Summary of Transaction Price and Allocation of Transaction Price to the Performance Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - Net Loss Per Share - Summary of Outstanding Potentially Dilutive Securities Excluded from Computation of Diluted Net Income (Loss) per Share (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Stock-Based Compensation (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - Cash, Cash Equivalents and Marketable Securities - Summary of Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Our Cash, Cash Equivalents and Marketable Securities (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Cash, Cash Equivalents and Marketable Securities - Summary of Fair Values of Our Cash, Cash Equivalents and Marketable Securities (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - Cash, Cash Equivalents and Marketable Securities - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - Cash, Cash Equivalents and Marketable Securities - Summary of Cash, Cash Equivalents and Restricted Cash (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Condensed Consolidated Balance Sheet Components - Summary of Prepaid and Other Current Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Condensed Consolidated Balance Sheet Components - Summary of Other Current Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Long-Term Debt - Summary of Long-Term Debt Instruments (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Long-Term Debt - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - Leases - Summary of Cash and Non-cash Information Related to Operating Leases (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - Leases - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - Stockholders' Equity (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - Fair Value Measurements (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - Business Segment - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - Business Segment - Summary of Segment Reporting Information (Details) link:presentationLink link:calculationLink link:definitionLink