00000 - Document - Template Link link:presentationLink link:calculationLink link:definitionLink 100000 - Document - Document and Entity Information link:calculationLink link:presentationLink link:definitionLink 100010 - Statement - Condensed Consolidated Balance Sheets (unaudited) link:calculationLink link:presentationLink link:definitionLink 100020 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) (unaudited) link:calculationLink link:presentationLink link:definitionLink 100030 - Statement - Condensed Consolidated Statements of Operations and Comprehensive Loss (unaudited) link:calculationLink link:presentationLink link:definitionLink 100040 - Statement - Condensed Consolidated Statements of Stockholders' Equity link:calculationLink link:presentationLink link:definitionLink 100050 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited) link:calculationLink link:presentationLink link:definitionLink 100060 - Disclosure - The Company link:calculationLink link:presentationLink link:definitionLink 100070 - Disclosure - Summary of Significant Accounting Policies link:calculationLink link:presentationLink link:definitionLink 100080 - Disclosure - Accrued and Other Current Liabilities link:calculationLink link:presentationLink link:definitionLink 100090 - Disclosure - Fair Value Measurements link:calculationLink link:presentationLink link:definitionLink 100100 - Disclosure - Marketable Securities link:calculationLink link:presentationLink link:definitionLink 100110 - Disclosure - Commitments and Contingencies link:calculationLink link:presentationLink link:definitionLink 100120 - Disclosure - Stock-Based Compensation link:calculationLink link:presentationLink link:definitionLink 100130 - Disclosure - Net Loss per Common Share link:calculationLink link:presentationLink link:definitionLink 100140 - Disclosure - Subsequent Event link:calculationLink link:presentationLink link:definitionLink 100150 - Disclosure - Summary of Significant Accounting Policies (Policies) link:calculationLink link:presentationLink link:definitionLink 100160 - Disclosure - Accrued and Other Current Liabilities (Tables) link:calculationLink link:presentationLink link:definitionLink 100170 - Disclosure - Fair Value Measurements (Tables) link:calculationLink link:presentationLink link:definitionLink 100180 - Disclosure - Marketable Securities (Tables) link:calculationLink link:presentationLink link:definitionLink 100190 - Disclosure - Stock-Based Compensation (Tables) link:calculationLink link:presentationLink link:definitionLink 100200 - Disclosure - Net Loss per Common Share (Tables) link:calculationLink link:presentationLink link:definitionLink 100210 - Disclosure - The Company - Additional Information (Details) link:calculationLink link:presentationLink link:definitionLink 100220 - Disclosure - Accrued and Other Current Liabilities - Schedule of Accrued and Other Current Liabilities (Details) link:calculationLink link:presentationLink link:definitionLink 100230 - Disclosure - Fair Value Measurements - Summary of Fair Value Hierarchy for Assets Measured at Fair Value on Recurring Basis (Details) link:calculationLink link:presentationLink link:definitionLink 100240 - Disclosure - Marketable Securities - Summary of Marketable Securities (Details) link:calculationLink link:presentationLink link:definitionLink 100250 - Disclosure - Marketable Securities - Additional Information (Details) link:calculationLink link:presentationLink link:definitionLink 100260 - Disclosure - Commitments and Contingencies - Additional Information (Details) link:calculationLink link:presentationLink link:definitionLink 100270 - Disclosure - Stock-Based Compensation - Additional Information (Details) link:calculationLink link:presentationLink link:definitionLink 100280 - Disclosure - Stock-Based Compensation - Summary of Stock Options Activity Under 2018 Plan and 2015 Equity Incentive Plan (Details) link:calculationLink link:presentationLink link:definitionLink 100290 - Disclosure - Stock-Based Compensation - Summary of Restricted Shares (Details) link:calculationLink link:presentationLink link:definitionLink 100300 - Disclosure - Stock-Based Compensation - Summary of Stock-based Compensation for Options and Restricted Shares Classified in Condensed Consolidated Statements of Operations and Comprehensive Loss (Details) link:calculationLink link:presentationLink link:definitionLink 100310 - Disclosure - Net Loss per Common Share - Summary of Anti-dilutive Securities Excluded from Computation of Diluted Net Loss per Common Share (Details) link:calculationLink link:presentationLink link:definitionLink 100320 - Disclosure - Subsequent Event - Additional Information (Details) link:calculationLink link:presentationLink link:definitionLink