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Entity Shell Company Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Title Trading Arrangement, Individual Title Statement [Table] Statement [Table] Measurement Frequency Measurement Frequency [Domain] Counterparty Name Counterparty Name [Axis] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Interest rate in case of default Debt Instrument, Interest Rate In Case Of Default Debt Instrument, Interest Rate In Case Of Default City Area Code City Area Code Current liabilities Liabilities, Current [Abstract] Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Purchase of short-term investments Payments to Acquire Short-Term Investments Level 1 Fair Value, Inputs, Level 1 [Member] Amount undrawn Debt Instrument, Amount Undrawn Debt Instrument, Amount Undrawn Total current assets Assets, Current Public Offering Public Offering [Member] Public Offering Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Public Offering And Private Placement Public Offering And Private Placement [Member] Public Offering And Private Placement Accrued liabilities Increase (Decrease) in Accrued Liabilities Line of credit facility, remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Number of options, exercisable (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number 2028 Long-Term Debt, Maturity, Year Three Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Income Taxes Income Tax Disclosure [Text Block] 2028 Lessee, Operating Lease, Liability, to be Paid, Year Four Earnings Per Share [Abstract] Earnings Per Share [Abstract] Equity [Abstract] Equity [Abstract] Accumulated deficit Retained Earnings (Accumulated Deficit) General and administrative General and Administrative Expense 2029 and thereafter Lessee, Operating Lease, Liability, To Be Paid, Year Five And After Year Five Lessee, Operating Lease, Liability, To Be Paid, Year Five And After Year Five Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Equity Awards Adjustments Equity Awards Adjustments [Member] Weighted-average discount rate Operating Lease, Weighted Average Discount Rate, Percent Operating lease, liability Operating Lease, Liability Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Underlying Securities Award Underlying Securities Amount Credit Facility [Axis] Credit Facility [Axis] Amendment Flag Amendment Flag Entity Registrant Name Entity Registrant Name Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Schedule of Shares Reserved for Future Issuance Schedule Of Common Stock Reserved For Future Issuance Table [Table Text Block] Schedule of common stock reserved for future issuance. Fair Value as of Grant Date Award Grant Date Fair Value Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Employee stock purchase plan offering period Employee Stock Purchase Plan Offering Period Employee stock purchase plan offering period. Aggregate intrinsic value, vested and expected to vest Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Level 2 Fair Value, Inputs, Level 2 [Member] Initial public offering, shares issued (in shares) Sale of Stock, Number of Shares Issued in Transaction Long-term Debt Debt Disclosure [Text Block] Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Domain] Geographical Geographical [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Term loan facility Debt Instrument, Face Amount Shares of common stock available for future issuance under the 2020 Employee Stock Purchase Plan 2020 Employee Stock Purchase Plan Two Thousand And Twenty Employee Stock Purchase Plan [Member] Two thousand and twenty employee stock purchase plan. Common stock issued in a public offering, net of offering expenses Stock Issued During Period, Value, New Issues Period in which options may be granted Share Based Compensation Options Under Plan May Be Granted For Periods Share based compensation options under plan may be granted for periods. Entity Address, Postal Zip Code Entity Address, Postal Zip Code Collaborative Arrangement and Arrangement Other than Collaborative Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Restatement Determination Date: Restatement Determination Date [Axis] Collaborative Arrangement and Arrangement Other than Collaborative Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Computer equipment and software Computer Equipment And Software [Member] Computer equipment and software. Title of 12(b) Security Title of 12(b) Security Common stock, $0.0001 par value per share; 300,000,000 shares authorized at June 30, 2024 and December 31, 2023; and 60,425,144 and 59,921,002 shares issued and outstanding at June 30, 2024 and December 31, 2023, respectively; (Note 10) Common Stock, Value, Issued Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Forfeited (USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Preferred stock, $0.0001 par value per share; 10,000,000 shares authorized at June 30, 2024 and December 31, 2023, and none issued or outstanding at June 30, 2024 and December 31, 2023 (Note 9) Preferred Stock, Value, Issued Prepayment fee percentage Debt Instrument, Prepayment Fee Percentage Debt Instrument, Prepayment Fee Percentage Number of Options Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Cash and Cash Equivalents Cash and Cash Equivalents [Domain] Percent of outstanding shares, shares added per year to plan Percent Of Outstanding Shares, Shares Added Per Year To Plan Percent Of Outstanding Shares, Shares Added Per Year To Plan Basic (USD per share) Earnings Per Share, Basic Accounts payable Increase (Decrease) in Accounts Payable Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Expiration period from date of grant Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Other Other Prepaid Expense, Current Valuation allowance as a percentage on total deferred tax assets Valuation Allowance As Percentage On Deferred Tax Assets Valuation allowance as percentage on deferred tax assets. Purchase of property and equipment in accounts payable and accrued liabilities Capital Expenditures Incurred but Not yet Paid Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Total current liabilities Liabilities, Current Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted Average Number of Shares Outstanding, Diluted [Abstract] Unrecognized compensation cost Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Total assets Assets Line of credit Long-Term Line of Credit Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period 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 Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Common stock shares outstanding percentage Share-Based Compensation Arrangement by Share-Based Payment Award, Percentage of Outstanding Stock Maximum Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Commitments and Contingencies (Note 13) Commitments and Contingencies Risk-free interest rate, minimum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Common stock fair market value percentage Common Stock Fair Market Value Percentage Common stock fair market value percentage . Termination Date Trading Arrangement Termination Date Expected volatility, maximum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Organization and Description of Business Business Description and Basis of Presentation [Text Block] Revenues Revenues 2026 Lessee, Operating Lease, Liability, to be Paid, Year Two Equity Incentive Plans and Stock-Based Compensation Share-Based Payment Arrangement [Text Block] 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. Entity Address, City or Town Entity Address, City or Town Debt Instrument [Axis] Debt Instrument [Axis] Schedule of Option Activity Under the 2015 Plan and 2020 Plan Share-Based Payment Arrangement, Option, Activity [Table Text Block] Maturity of short-term investments Proceeds from Maturities, Prepayments and Calls of Short-Term Investments Total stock-based compensation expense Share-Based Payment Arrangement, Expense Net loss Net loss Net Income (Loss) Net Income (Loss) Attributable to Parent Trading Arrangement: Trading Arrangement [Axis] Granted (USD per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Debt Draw Period [Domain] Debt Draw Period [Domain] Debt Draw Period [Domain] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Entity File Number Entity File Number Cash and Cash Equivalents Cash and Cash Equivalents [Axis] Document Fiscal Year Focus Document Fiscal Year Focus Income Statement [Abstract] Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Second Anniversary Second Anniversary [Member] Second Anniversary Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Prepaid Expenses and Other Current Assets Prepaid Expenses And Other Current Assets [Text Block] Prepaid Expenses And Other Current Assets Lease term Lessee, Operating Lease, Term of Contract Assets measured at fair value Assets, Fair Value Disclosure Name Forgone Recovery, Individual Name 2024 (remainder of the year) Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Aggregate intrinsic value, exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Weighted-average remaining lease term (in years) Operating Lease, Weighted Average Remaining Lease Term Document Period End Date Document Period End Date Sale of Stock Sale of Stock [Axis] Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Future lease payments Total undiscounted lease payments Lessee, Operating Lease, Liability, to be Paid Outstanding and unvested, beginning balance (in shares) Outstanding and unvested, ending balance (in shares) Outstanding and unvested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Insider Trading Arrangements [Line Items] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Three PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Adjustment to Compensation: Adjustment to Compensation [Axis] Loan Agreement Loan Agreement [Member] Loan Agreement Prepaid expenses and other current assets (Note 5) Total prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Document Transition Report Document Transition Report Document Quarterly Report Document Quarterly Report Debt instrument final payment, percentage of original principal amount drawn Debt Instrument Final Payment, Percentage Of Original Principal Amount Drawn Debt Instrument Final Payment, Percentage Of Original Principal Amount Drawn Accumulated other comprehensive (loss) gain Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Current Reporting Status Entity Current Reporting Status Accumulated Deficit Retained Earnings [Member] Proceeds from sale of common stock in a public offering Proceeds from Issuance Initial Public Offering Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Pliant Therapeutics Pliant Therapeutics [Member] Pliant Therapeutics Contractual arrangements cancellation period Contractual Arrangements Cancellation Period Contractual arrangements cancellation period. Related Party Related and Nonrelated Parties [Axis] Shares used in computing net loss per share - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Vesting of RSUs Restricted stock units Restricted Stock Units (RSUs) [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Executive Category: Executive Category [Axis] Name Awards Close in Time to MNPI Disclosures, Individual Name Construction-in-progress Construction in Progress [Member] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period Entity Filer Category Entity Filer Category Income Statement Location Statement of Income Location, Balance [Domain] Letter of Credit Letter of Credit [Member] 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 Company Selected Measure Name Company Selected Measure Name Private Placement Private Placement [Member]