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Financial Instruments Fair Value Disclosures [Text Block] Total other comprehensive gain (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Lender Name [Axis] Lender Name [Axis] Common stock issued in a public offering, net of offering expenses Stock Issued During Period, Value, New Issues Equity [Abstract] Equity [Abstract] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Weighted-average remaining lease term (in years) Operating Lease, Weighted Average Remaining Lease Term Revenue Revenue from Contract with Customer, Excluding Assessed Tax Proceeds from issuances of common stock under benefit plans Proceeds From Issuances Of Common Stock Under Benefit Plans Proceeds From Issuances Of Common Stock Under Benefit Plans Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Amendment Flag Amendment Flag Money Market Funds Money Market Funds [Member] Cash and Cash Equivalents Cash and Cash Equivalents [Axis] Schedule of Black-Scholes Option Pricing Model to Estimate Stock-based Compensation Expense for 2020 Employee Stock Purchase Plan Schedule of Share-Based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] Common stock fair market value percentage Common Stock Fair Market Value Percentage Common stock fair market value percentage . Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Weighted-average incremental borrowing rate Operating Lease, Weighted Average Discount Rate, Percent Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Number of common stock issued (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Credit Facility [Domain] Credit Facility [Domain] Public offering expenses Adjustments To Additional Paid In Capital, Public Offering Expenses Adjustments To Additional Paid In Capital, Public Offering Expenses Exercise price as a percentage of estimated grant date fair value of shares Share Based Compensation Arrangement By Share Based Payment Award Exercise Price With Purchase Price Of Common Stock Percentage Of Estimated Grant Date Fair Value For Shareholders Share based compensation arrangement by share based payment award exercise price with purchase price of common stock percentage of estimated grant date fair value for shareholders. Loan agreement interest rate Debt Instrument, Basis Spread on Variable Rate Net loss per share: Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Leasehold improvements Leasehold Improvements [Member] Shares used in computing net loss per share attributable to common stockholders - diluted (in shares) Weighted-average common shares outstanding used to calculate net loss per share attributable to common stockholders, diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Debt Draw Period [Domain] Debt Draw Period [Domain] Debt Draw Period [Domain] Operating expenses: Operating Expenses [Abstract] Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Additional paid-in capital Additional Paid in Capital, Common Stock Additional Paid-In Capital Additional Paid-in Capital [Member] Balance Sheet Location Balance Sheet Location [Axis] Total assets Assets Cover [Abstract] Cover [Abstract] Laboratory equipment Equipment [Member] Prepaid Expenses and Other Current Assets Prepaid Expenses And Other Current Assets [Text Block] Prepaid Expenses And Other Current Assets Stock-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Other Other Prepaid Expense, Current Fair Value, Recurring Fair Value, Recurring [Member] Defined Contribution Plan Defined Contribution Plan [Text Block] Future lease payments Total undiscounted lease payments Lessee, Operating Lease, Liability, to be Paid Short-term investments Short-Term Investments Construction-in-progress Construction in Progress [Member] Total operating expenses Operating Expenses Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Lease term extension period Lessee, Operating Lease, Renewal Term Equity Component Equity Component [Domain] Loan Agreement Loan Agreement [Member] Loan Agreement Debt Instrument [Line Items] Debt Instrument [Line Items] Shares used in computing net loss per share attributable to common stockholders - basic (in shares) Weighted-average common shares outstanding used to calculate net loss per share attributable to common stockholders, basic (in shares) Weighted Average Number of Shares Outstanding, Basic Entity Current Reporting Status Entity Current Reporting Status Less: unamortized debt issuance costs Unamortized Debt Issuance Expense Loss from operations Operating Income (Loss) Proceeds from sale of common stock in a public offering Proceeds from Issuance Initial Public Offering Pliant Therapeutics Pliant Therapeutics [Member] Pliant Therapeutics Contractual arrangements cancellation period Contractual Arrangements Cancellation Period Contractual arrangements cancellation period. Comprehensive loss: Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Decrease in right-of -use assets and liabilities from lease modifications Decrease in Right-of -Use Assets and Liabilities from Lease Modifications Decrease in Right-of -Use Assets and Liabilities from Lease Modifications Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] Statement [Line Items] Statement [Line Items] Number of options, vested and expected to vest (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Line of credit Long-Term Line of Credit Schedule of Prepaid Expenses and Other Current Assets Schedule Of Prepaid Expenses And Other Current Assets [Table Text Block] Schedule Of Prepaid Expenses And Other Current Assets