100000 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 100010 - Statement - BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 100020 - Statement - BALANCE SHEETS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 100030 - Statement - STATEMENTS OF OPERATIONS link:presentationLink link:calculationLink link:definitionLink 100040 - Statement - STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) link:presentationLink link:calculationLink link:definitionLink 100050 - Statement - STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 100060 - Statement - STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 100070 - Statement - STATEMENTS OF CASH FLOWS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 100080 - Disclosure - Organization and Principal Activities link:presentationLink link:calculationLink link:definitionLink 100090 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 100100 - Disclosure - Cash Equivalents and Investments link:presentationLink link:calculationLink link:definitionLink 100110 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 100120 - Disclosure - Balance Sheet Components link:presentationLink link:calculationLink link:definitionLink 100130 - Disclosure - Leases link:presentationLink link:calculationLink link:definitionLink 100140 - Disclosure - Term Loan link:presentationLink link:calculationLink link:definitionLink 100150 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 100160 - Disclosure - Capital Structure link:presentationLink link:calculationLink link:definitionLink 100170 - Disclosure - Equity Incentive Plan and Stock-Based Compensation Expense link:presentationLink link:calculationLink link:definitionLink 100180 - Disclosure - License Agreement link:presentationLink link:calculationLink link:definitionLink 100190 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 100200 - Disclosure - 401(k) Retirement Savings Plan link:presentationLink link:calculationLink link:definitionLink 100210 - Disclosure - Net Loss Per Share link:presentationLink link:calculationLink link:definitionLink 100220 - Disclosure - Related Party Transactions link:presentationLink link:calculationLink link:definitionLink 100230 - Disclosure - Subsequent Events link:presentationLink link:calculationLink link:definitionLink 100240 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 100250 - Disclosure - Summary of Significant Accounting Policies (Tables) link:presentationLink link:calculationLink link:definitionLink 100260 - Disclosure - Cash Equivalents and Investments (Tables) link:presentationLink link:calculationLink link:definitionLink 100270 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 100280 - Disclosure - Balance Sheet Components (Tables) link:presentationLink link:calculationLink link:definitionLink 100290 - Disclosure - Leases (Tables) link:presentationLink link:calculationLink link:definitionLink 100300 - Disclosure - Term Loan (Tables) link:presentationLink link:calculationLink link:definitionLink 100310 - Disclosure - Capital Structure (Tables) link:presentationLink link:calculationLink link:definitionLink 100320 - Disclosure - Equity Incentive Plan and Stock-Based Compensation Expense (Tables) link:presentationLink link:calculationLink link:definitionLink 100330 - Disclosure - Income Taxes (Tables) link:presentationLink link:calculationLink link:definitionLink 100340 - Disclosure - Net Loss Per Share (Tables) link:presentationLink link:calculationLink link:definitionLink 100350 - Disclosure - Organization and Principal Activities - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 100360 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 100370 - Disclosure - Summary of Significant Accounting Policies - Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) link:presentationLink link:calculationLink link:definitionLink 100380 - Disclosure - Summary of Significant Accounting Policies - Schedule of Useful Lives of Property and Equipment (Details) link:presentationLink link:calculationLink link:definitionLink 100390 - Disclosure - Cash Equivalents And Investments - Summary Of Amortized Cost, Unrealized Gains, And Losses, And Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 100400 - Disclosure - Leases - Future Minimum Annual Lease Commitments under Non-cancelable Operating Leases (Detail) 2 link:presentationLink link:calculationLink link:definitionLink 100410 - Disclosure - Cash Equivalents And Investments - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 100420 - Disclosure - Fair Value Measurements - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 100430 - Disclosure - Fair Value Measurements - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 100440 - Disclosure - Term Loan - Schedule of Term Loan (Details) 2 link:presentationLink link:calculationLink link:definitionLink 100450 - Disclosure - Balance Sheet Components - Schedule of Property and Equipment, Net (Details) link:presentationLink link:calculationLink link:definitionLink 100460 - Disclosure - Balance Sheet Components (Additional Information) (Details) link:presentationLink link:calculationLink link:definitionLink 100470 - Disclosure - Balance Sheet Components - Schedule of Accrued Expenses and Other Current Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 100480 - Disclosure - Leases - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 100490 - Disclosure - Leases - Future Minimum Annual Lease Commitments under Non-cancelable Operating Leases (Detail) link:presentationLink link:calculationLink link:definitionLink 100500 - Disclosure - Term Loan - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 100510 - Disclosure - Term Loan - Schedule of Term Loan (Details) link:presentationLink link:calculationLink link:definitionLink 100520 - Disclosure - Term Loan - Schedule of Future Principal Payments (Details) link:presentationLink link:calculationLink link:definitionLink 100530 - Disclosure - Capital Structure - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 100540 - Disclosure - Capital Structure - Summary of Common Stock Reserved for Future Issuance (Details) link:presentationLink link:calculationLink link:definitionLink 100550 - Disclosure - Equity Incentive Plan and Stock-Based Compensation Expense - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 100560 - Disclosure - Equity Incentive Plan and Stock-Based Compensation Expense - Summary of Stock Option Activity (Details) link:presentationLink link:calculationLink link:definitionLink 100570 - Disclosure - Equity Incentive Plan and Stock-Based Compensation Expense - Schedule of Weighted-Average Assumptions to Estimate Fair Value Using Black-Scholes Option-Pricing Model (Details) link:presentationLink link:calculationLink link:definitionLink 100580 - Disclosure - Equity Incentive Plan and Stock-Based Compensation Expense - Summary of RSU Activity (Details) link:presentationLink link:calculationLink link:definitionLink 100590 - Disclosure - Equity Incentive Plan and Stock-Based Compensation Expense - Schedule of Assumptions Used to Calculate Stock Based Compensation Each Stock Purchase Right Granted Under ESPP (Details) link:presentationLink link:calculationLink link:definitionLink 100600 - Disclosure - Equity Incentive Plan and Stock-Based Compensation Expense - Summary of Stock-Based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 100610 - Disclosure - License Agreement - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 100620 - Disclosure - Income Taxes - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 100630 - Disclosure - Income Taxes - Schedule of Reconciliation of the Federal Statutory Income Tax Rate to Effective Tax Rate (Details) link:presentationLink link:calculationLink link:definitionLink 100640 - Disclosure - Income Taxes - Schedule of Significant Components of Net Deferred Tax Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 100650 - Disclosure - Income Taxes - Schedule of Reconciliation of Beginning and Ending Balance of Unrecognized Tax Benefits (Details) link:presentationLink link:calculationLink link:definitionLink 100660 - Disclosure - 401(k) Retirement Savings Plan - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 100670 - Disclosure - Net Loss Per Share - Schedule of Computation of Basic and Diluted Net Loss Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 100680 - Disclosure - Net Loss Per Share - Schedule of Potentially Dilutive Securities not Included in Calculation of Diluted Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 100690 - Disclosure - Related Party Transactions - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 100700 - Disclosure - Subsequent Events - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink