Restricted stock units outstanding, granted (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period
Options outstanding, Aggregate intrinsic value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value
Commitments and Contingencies
Commitments and Contingencies Disclosure [Text Block]
Related Party [Axis]
Related Party [Axis]
Series A Preferred Stock
Series A Preferred Stock [Member]
Amortization of debt discount
Amortization of Debt Discount (Premium)
Right-of-use asset
Deferred Tax Liabilities, Right-Of-Use Assets
Deferred Tax Liabilities, Right-Of-Use Assets
Gain contingency, patents allegedly infringed upon, number
Gain Contingency, Patents Allegedly Infringed upon, Number
Issuance of common stock upon exercise of warrants (in shares)
Stock issued from exercise of warrants (in shares)
Stock Issued During Period, Shares, Exercise of Warrants
Stock Issued During Period, Shares, Exercise of Warrants
Shares authorized (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized
Maturity of marketable securities
Proceeds from Sale and Maturity of Marketable Securities
Change in tax rate due to Tax Act
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount
Value of shares authorized
Share-based Compensation Arrangement By Share-based Payment Award, Value Of Shares Authorized
Share-based Compensation Arrangement By Share-based Payment Award, Value Of Shares Authorized
Proceeds from issuance of common stock upon the exercise of warrants
Proceeds from Warrant Exercises
Number of remaining petitions
Number Of Petitions Filed, Remaining
Number Of Petitions Filed, Remaining
Acquired license
Licensing Agreements [Member]
Range [Domain]
Statistical Measurement [Domain]
LIABILITIES, REDEEMABLE NONCONTROLLING INTEREST AND STOCKHOLDERS’ EQUITY
Liabilities and Equity [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Redeemable noncontrolling interest, redemption value
Redeemable Noncontrolling Interest, Equity, Redemption Value
Estimated fair value, cash, cash equivalents and marketable securities
Cash, Cash Equivalents and Debt Securities, Fair Value
Cash, Cash Equivalents and Debt Securities, Fair Value
Equity component of convertible senior notes, net
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt
Convertible Preferred Stock
Preferred stock warrants (on an as if converted basis)
Preferred Stock [Member]
Security Exchange Name
Security Exchange Name
Employee Benefit Plan
Compensation and Employee Benefit Plans [Text Block]
Guardant Health AMEA, Inc
Guardant Health AMEA, Inc [Member]
Guardant Health AMEA, Inc [Member]
Sales and marketing expense
Selling and Marketing Expense [Member]
Total current liabilities
Liabilities, Current
Market-based restricted stock units
MSUs
Performance Shares [Member]
Prepaid expenses and other current assets, net
Prepaid Expense and Other Assets, Current
Weighted-average grant date fair value, beginning balance (in usd per share)
Weighted-average grant date fair value, ending balance (in usd per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Accrued professional services
Accrued Professional Fees, Current
Contractual Receivables, Allowance For Credit Loss
Contractual Receivables, Allowance For Credit Loss [Table Text Block]
Contractual Receivables, Allowance For Credit Loss
ASSETS
Assets [Abstract]
Property, Plant and Equipment [Table]
Property, Plant and Equipment [Table]
Investment, Name [Axis]
Investment, Name [Axis]
Accounting Policies [Abstract]
Accounting Policies [Abstract]
Tranche One
Tranche One [Member]
Tranche One
Cash and Cash Equivalents and Restricted Cash
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]
Foreign currency translation adjustments
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax
Estimated useful life
Remaining Weighted Average Useful Life
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life
2021
Lessee, Operating Lease, Liability, to be Paid, Year One
Payments to acquire interest in joint venture
Payments to Acquire Interest in Joint Venture
Common Class B
Common Class B [Member]
Lease liabilities
Deferred Tax Assets, Lease Liabilities
Deferred Tax Assets, Lease Liabilities
Beginning number of shares, outstanding (in shares)
Ending number of shares, outstanding (in shares)
Stock options outstanding (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number
2024
Lessee, Operating Lease, Liability, to be Paid, Year Four
Additional service period
Share Based Compensation Arrangement By Share Based Payment Award, Additional Service Period
Share Based Compensation Arrangement By Share Based Payment Award, Additional Service Period
State
Current State and Local Tax Expense (Benefit)
Beginning balance (in shares)
Ending balance (in shares)
Shares, Outstanding
Debt Instrument, Conversion [Domain]
Debt Instrument, Conversion [Domain]
Debt Instrument, Conversion
Office and laboratory space
Building [Member]
Common stock, par value (in usd per share)
Common Stock, Par or Stated Value Per Share
Other comprehensive income (loss), net of tax impact:
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Other long-term liabilities
Other Liabilities, Noncurrent
Payments made on finance lease obligations
Finance Lease, Principal Payments
Short-term marketable securities
Marketable Securities, Current
Reversal of stock based compensation expense
Reversal Of Stock Based Compensation Expense
Reversal Of Stock Based Compensation Expense
Increase (decrease) in fair value
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease)
Inventory
Inventory, Net
Fair Value, Measurement Frequency [Domain]
Measurement Frequency [Domain]
Tranche 3 - $200 per share
Share-based Payment Arrangement, Tranche Three [Member]
Risky rate, cost of equity
Share-Based Compensation Arrangement By Share-based Payment Award, Fair Value Assumptions, Cost Of Equity Interest Rate
Share-Based Compensation Arrangement By Share-based Payment Award, Fair Value Assumptions, Cost Of Equity Interest Rate
Concentration risk, percentage
Concentration Risk, Percentage
Option term, expiration period
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period
Schedule of Performance-based Restricted Stock Unites Vesting Conditions
Share-based Compensation Arrangements by Share-based Payment Award, Performance-Based Units, Vested and Expected to Vest [Table Text Block]
Statement [Line Items]
Statement [Line Items]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
Class of Stock [Domain]
Class of Stock [Domain]
Computer hardware
Computer Equipment [Member]
Schedule of Collaborative Arrangements and Non-collaborative Arrangement Transactions [Table]
Collaborative Arrangement and Arrangement Other than Collaborative [Table]
Number of parties with patent license agreement
Number of Parties With Patent License Agreement
Number of Parties With Patent License Agreement
Measurement Input Type [Domain]
Measurement Input Type [Domain]
Statement [Table]
Statement [Table]
Charged to (Reversed from) other income (expense), net, allowance for credit loss, current
Contractual Receivables, Credit Loss, Expense (Reversal), Current
Contractual Receivables, Credit Loss, Expense (Reversal), Current
Range [Axis]
Statistical Measurement [Axis]
Contingent Consideration
Contingent Consideration [Member]
Contingent Consideration [Member]
Convertible senior notes, net
Convertible Debt, Noncurrent
Exercise price of warrants (in usd per share)
Class of Warrant or Right, Exercise Price of Warrants or Rights
Other receivables and other assets, term
Contractual Receivables, Term
Contractual Receivables, Term
Marketable Securities
Marketable Securities, Policy [Policy Text Block]
Entity Small Business
Entity Small Business
Sale of stock, number of shares issued in transaction (in shares)
Sale of Stock, Number of Shares Issued in Transaction
Debt
Debt Disclosure [Text Block]
Fair Value Hierarchy and NAV [Domain]
Fair Value Hierarchy and NAV [Domain]
Collaborative Arrangement
Collaborative Arrangement [Member]
Amendment Flag
Amendment Flag
Shares Available for Grant
Share-based Compensation Arrangement by Share-based Payment Award, Shares Available for Grant [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Available for Grant [Roll Forward]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Unrecognized tax benefits, income tax penalties and interest accrued
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued
Fair value — beginning of period
Fair value — end of period
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value
Accrued clinical trials and studies
Accrued Clinical Trials and Studies
Accrued Clinical Trials and Studies
Common stock, shares reserved for future issuance (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized
Beginning number of shares, available for grant (in shares)
Ending number of shares, available for grant (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant
Others
Other Accrued Liabilities, Current
Canceled (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options Available for Grant, Cancellations in Period, Gross
Share-based Compensation Arrangement by Share-based Payment Award, Options Available for Grant, Cancellations in Period, Gross
Long term maturity period (years)
Long Term Marketable Securities, Maturity Period
Long Term Marketable Securities, Maturity Period
Measurement Frequency [Axis]
Measurement Frequency [Axis]
Financial Instruments [Domain]
Financial Instruments [Domain]
Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table]
Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table]
Stock based compensation not recognized
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount
Property, Plant and Equipment, Type [Axis]
Long-Lived Tangible Asset [Axis]
Shares available for issuance under the 2018 Employee Stock Purchase Plan
ESPP obligation
Employee Stock [Member]
Income Statement Location [Domain]
Income Statement Location [Domain]
Research and development credits
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount
2022
Lessee, Operating Lease, Liability, to be Paid, Year Two
State
State and Local Jurisdiction [Member]
2018 Employee Stock Purchase Plan
2018 Employee Stock Purchase Plan [Member]
2018 Employee Stock Purchase Plan [Member]
Other Commitments [Line Items]
Other Commitments [Line Items]
FINANCING ACTIVITIES:
Net Cash Provided by (Used in) Financing Activities [Abstract]
Convertible Preferred Stock
Preferred Stock [Text Block]
Lease Information
Lease, Cost [Table Text Block]
2023
Lessee, Operating Lease, Liability, to be Paid, Year Three
Other assets, net
Other Assets, Noncurrent
Earn-Out Consideration
Earn-Out Consideration [Member]
Earn-Out Consideration [Member]
Plan Name [Axis]
Plan Name [Axis]
Cash equivalents
Estimated fair value, cash and cash equivalents
Cash and Cash Equivalents, Fair Value Disclosure
Concentration Risk [Table]
Concentration Risk [Table]
Total Assets
Variable interest entity, assets
Assets
Related Party Transactions
Related Party Transactions Disclosure [Text Block]
Customer E
Customer E [Member]
Customer E
Total interest expense recognized
Interest Expense, Debt
Restricted stock units outstanding, beginning balance (in shares)
Restricted stock units outstanding, ending balance (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number
IPR&D
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets
Income Taxes [Line Items]
Income Taxes [Line Items]
[Line Items] for Income Taxes [Table]
Series A Convertible Preferred Stock
Series A Convertible Preferred Stock [Member]
Series A Convertible Preferred Stock [Member]
Antidilutive Securities [Axis]
Antidilutive Securities [Axis]
Issuance of common stock upon early exercise of stock options (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Early Exercises in Period
Share-based Compensation Arrangement by Share-based Payment Award, Options, Early Exercises in Period
Class of Warrant or Right [Axis]
Class of Warrant or Right [Axis]
Marketable securities, short-term
Debt Securities, Current
Concentration of Risk
Concentration Risk, Credit Risk, Policy [Policy Text Block]
Contractual receivables, installment payment
Proceeds From Contractual Receivable
Proceeds From Contractual Receivable
Cost of development services and other
Cost of Development Services
Cost of Development Services
Stock-based compensation
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount
Cash
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents
KeyGene Patent License Acquisition
KeyGene Patent License Acquisition [Member]
KeyGene Patent License Acquisition [Member]
Total Liabilities
Variable interest entity, liabilities
Liabilities
Customer D
Customer D [Member]
Customer D [Member]
Expected volatility rate
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate
Less: Imputed Interest
Lessee, Operating Lease, Liability, Undiscounted Excess Amount
Bellweather Bio, Inc.
Bellweather Bio, Inc. [Member]
Bellweather Bio, Inc. [Member]
Schedule of Related Party Transactions, by Related Party [Table]
Schedule of Related Party Transactions, by Related Party [Table]
Schedule of Common Stock Reserved for Future Issuance
Schedule of Stock by Class [Table Text Block]
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Abstract]
Level 1
Fair Value, Inputs, Level 1 [Member]
Preferred stock, shares issued upon conversion of stock (in shares)
Preferred Stock, Shares Issued Upon Conversion Of Common Stock
Preferred Stock, Shares Issued Upon Conversion Of Common Stock
Inventory
Increase (Decrease) in Inventories
Restricted Stock Units Outstanding
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Release from valuation allowance
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount
Precision oncology testing
Revenue from Precision Oncology Testing
Revenue from Precision Oncology Testing
Additional Paid-in Capital
Additional Paid-in Capital [Member]
Intangible assets
Deferred Tax Assets, Goodwill and Intangible Assets
Stock split, conversion ratio
Stockholders' Equity Note, Stock Split, Conversion Ratio
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
Machinery and equipment
Machinery and Equipment [Member]
Common stock, shares outstanding (in shares)
Common Stock, Shares, Outstanding
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Abstract]
IPO
IPO [Member]
Beginning balance of options outstanding (in usd per share)
Ending balance of options outstanding (in usd per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price
Business acquisition, net of cash acquired
Payments to Acquire Businesses, Net of Cash Acquired
Common stock, shares authorized (in shares)
Common stock, shares authorized (in shares)
Common Stock, Shares Authorized
Property and equipment, gross
Property, Plant and Equipment, Gross
Proceeds from issuance of common stock upon exercise of stock options
Proceeds from Stock Options Exercised
Federal
Deferred Federal Income Tax Expense (Benefit)
Schedule of Segment Reporting Information, by Segment
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Accrued compensation
Increase (Decrease) in Employee Related Liabilities
Income Statement [Abstract]
Income Statement [Abstract]
Accumulated Other Comprehensive Gain (Loss)
AOCI Attributable to Parent [Member]
Deferred rent
Increase (Decrease) in Deferred Charges
Fair value of stock issued for purchase of license agreement
Stock Issued During Period, Value, Purchase of Assets
Prepaid expenses and other current assets
Increase (Decrease) in Prepaid Expense and Other Assets
Accrued royalty obligations
Accrued Royalties, Current
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Segment Reporting Information, by Segment [Table]
VIE, primary beneficiary
Variable Interest Entity, Primary Beneficiary [Member]
Use of Estimates
Use of Estimates, Policy [Policy Text Block]
Income Tax Authority [Domain]
Income Tax Authority [Domain]
Computer software
Software and Software Development Costs [Member]
Consolidated Entities [Axis]
Consolidated Entities [Axis]
JOBS Act Accounting Election
JOBS Act Accounting Election [Policy Text Block]
JOBS Act Accounting Election [Policy Text Block]
Benefit from income tax differences
Income Tax Credits and Adjustments
Counterparty Name [Domain]
Counterparty Name [Domain]
Purchase of property and equipment
Payments to Acquire Property, Plant, and Equipment
Initial fair value of contingent consideration at acquisition date
Contingent consideration
Business Combination, Contingent Consideration, Liability
Common stock, shares reserved for future issuance (in shares)
Common Stock, Capital Shares Reserved for Future Issuance
Covenants Not To Compete
Covenants Not To Compete [Member]
Covenants Not To Compete [Member]
Loss before provision for income taxes
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest
Charge of in-process research and development costs with no alternative future use
Charge Of In Process Research And Development
Charge Of In Process Research And Development
Goodwill impairment
Goodwill, Impaired, Accumulated Impairment Loss
Payment in connection with a license agreement
Payment In Connection With a License Agreement
Payment In Connection With a License Agreement
Other Income
Other Income [Member]
Entity [Domain]
Entity [Domain]
Taxes paid related to net share settlement of restricted stock units
Payment, Tax Withholding, Share-based Payment Arrangement
Vesting of restricted stock units (in shares)
Stock Issued During Period, Shares, Restricted Stock Award, Gross
Comprehensive loss attributable to redeemable noncontrolling interest
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest
Stock subject to repurchase (in shares)
Common Stock Subject to Repurchase or Cancellation
Common Stock Subject to Repurchase or Cancellation
Cost of Development Services and Other
Cost of Development Services [Policy Text Block]
Cost of Development Services [Policy Text Block]
Intangible Assets, Net and Goodwill
Intangible Assets Disclosure [Text Block]
Useful life (in years)
Property, Plant and Equipment, Useful Life
Affiliated Entity
Affiliated Entity [Member]
Cash proceeds received for unvested shares
Deferred Compensation Share-based Arrangements, Liability, Classified, Noncurrent
Lessee, Lease, Description [Line Items]
Lessee, Lease, Description [Line Items]
Net loss for the period
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Net Income (Loss) For The Period
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Net Income (Loss) For The Period
AMEA 2020 Plan
AMEA 2020 Plan [Member]
AMEA 2020 Plan
Issuance of common stock upon exercise of warrants
Stock Issued During Period, Value, Exercise of Warrants
Stock Issued During Period, Value, Exercise of Warrants
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Abstract]
Deferred revenue
Increase (Decrease) in Deferred Revenue
Estimated fair value, debt securities
Debt Securities, Available-for-sale
Section 481 (a) adjustment
Deferred Tax Liabilities, Section 481 (a) Adjustment
Deferred Tax Liabilities, Section 481 (a) Adjustment
Threshold percentage of fair value (greater than)
Variable Interest Entity, Threshold Percentage of Fair Value
Variable Interest Entity, Threshold Percentage of Fair Value
Restricted stock
Restricted Stock [Member]
Deferred Offering Costs
Deferred Charges, Policy [Policy Text Block]
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based Payment Arrangement [Abstract]
Consolidated Entities [Domain]
Consolidated Entities [Domain]
Operating lease liabilities
Operating Lease, Liability, Current
Tranche Two
Tranche Two [Member]
Tranche Two
Less: issuance costs
Debt Instrument, Convertible, Issuance Costs, Equity Component
Debt Instrument, Convertible, Issuance Costs, Equity Component
Weighted-average grant date fair value, canceled (in usd per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value
Schedule of Stock Options Valuation Assumptions
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Fair Value Measurements. Cash Equivalents and Marketable Securities
Fair Value Disclosures [Text Block]
Lease agreements not yet commenced
Lessee, Operating Lease, Lease Not Yet Commenced, Lease Payments
Lessee, Operating Lease, Lease Not Yet Commenced, Lease Payments
Accounts Receivable
Accounts Receivable [Member]
Customer [Domain]
Customer [Domain]
Cumulative effect adjustment
Cumulative Effect, Period of Adoption, Adjustment [Member]
Share price, premium
Convertible Debt, Hedge, Share Price, Premium Percentage
Convertible Debt, Hedge, Share Price, Premium Percentage
Entity Registrant Name
Entity Registrant Name
Business Acquisition [Line Items]
Business Acquisition [Line Items]
Weighted-average discount rate
Operating Lease, Weighted Average Discount Rate, Percent
Concentration Risk [Line Items]
Concentration Risk [Line Items]
Options vested and exercisable, Number of options (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number
Accrued compensation
Deferred Compensation Liability, Current
Less: debt issuance costs, net of amortization
Debt Issuance Costs, Net
Weighted-Average Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Class of Warrant or Right [Line Items]
Class of Warrant or Right [Line Items]
Equity method investment, shares purchased (in shares)
Equity Method Investment, Shares Purchased
Equity Method Investment, Shares Purchased
Conversion of convertible preferred stock to common stock upon initial public offering
Stock Issued During Period, Value, Conversion of Convertible Preferred Stock to Common Stock Upon Initial Public Offering
Stock Issued During Period, Value, Conversion of Convertible Preferred Stock to Common Stock Upon Initial Public Offering
Issuance of common stock upon initial and follow-on offering, net of issuance costs
Stock Issued During Period, Value, Conversion of Convertible Securities
Entity Incorporation, State or Country Code
Entity Incorporation, State or Country Code
Non-cash operating lease costs
Non Cash Operating Lease Costs
Non Cash Operating Lease Costs
Share price of stock issued (in usd per share)
Shares Issued, Price Per Share
2027 Notes
Debt Instrument, Convertible, Equity Component Before Issuance Costs
Debt Instrument, Convertible, Equity Component, Gross
Adjustments for New Accounting Pronouncements [Axis]
Accounting Standards Update [Axis]
Gross Unrealized Loss
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax
Sale of Stock [Axis]
Sale of Stock [Axis]
Entity Address, Postal Zip Code
Entity Address, Postal Zip Code
Net deferred tax assets
Deferred Tax Assets, Net of Valuation Allowance
Employee stock purchase plan, purchase price of common stock
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent
Goodwill
Goodwill
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale [Line Items]
Market-based restricted stock share price goal
Share-based Compensation Arrangement by Share-based Payment Award, Share Price Goal Period
Share-based Compensation Arrangement by Share-based Payment Award, Share Price Goal Period
Arrangements and Non-arrangement Transactions [Domain]
Collaborative Arrangement and Arrangement Other than Collaborative [Domain]
Warrant
Warrant [Member]
Warrants, outstanding (in shares)
Class of Warrant or Right, Outstanding
Net operating losses carryforwards
Deferred Tax Assets, Operating Loss Carryforwards
Class of Warrant or Right [Table]
Class of Warrant or Right [Table]
Purchase of convertible note hedges
Payments for Hedge, Financing Activities
Principal amount
Principal
Debt Instrument, Face Amount
Canceled (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period
Equity [Abstract]
Equity [Abstract]
Total assets
Assets, Fair Value Disclosure
Issuance costs
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]
Annual increase in shares available (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Annual Increase In Shares Available
Share-based Compensation Arrangement by Share-based Payment Award, Options, Annual Increase In Shares Available
Supplemental Disclosures of Noncash Investing and Financing Activities:
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Accruals and reserves
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals
Granted (in usd per share)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price
Credit Concentration Risk
Customer Concentration Risk [Member]
Schedule of Future Amortization Expense
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Customer C
Customer C [Member]
Customer C
Future royalty payments
Payments for Future Royalties
Payments for Future Royalties
Number of operating segments
Number of Operating Segments
Restricted stock units outstanding, canceled (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Debt Disclosure [Abstract]
Debt Disclosure [Abstract]
Sales and marketing expense
Selling and Marketing Expense
Amortization of debt discount and debt issuance costs
Amortization of Debt Issuance Costs and Discounts
Net cash provided by financing activities
Net Cash Provided by (Used in) Financing Activities
Unrecognized tax benefits
Unrecognized tax benefits - Beginning of period
Unrecognized tax benefits - End of period
Unrecognized Tax Benefits
Stock subject to repurchase, per share (in usd per share)
Weighted Average Number of Shares, Common Stock Subject to Repurchase or Cancellation, Per Share
Weighted Average Number of Shares, Common Stock Subject to Repurchase or Cancellation, Per Share
Counterparty Name [Axis]
Counterparty Name [Axis]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets [Line Items]
Document Fiscal Year Focus
Document Fiscal Year Focus
2022
Finite-Lived Intangible Asset, Expected Amortization, Year Two
Guardant Health, Inc.
Guardant Health, Inc. [Member]
Guardant Health, Inc.
Cash and Cash Equivalents [Axis]
Cash and Cash Equivalents [Axis]
Entity Current Reporting Status
Entity Current Reporting Status
Sale of stock, price (in usd per share)
Sale of Stock, Price Per Share
Related Party Transaction [Axis]
Related Party Transaction [Axis]
Net Carrying Amount
Intangible Assets, Net (Including Goodwill)
Customer A
Customer A [Member]
Customer A [Member]
Net Loss Per Share Attributable to Common Shareholders
Earnings Per Share, Policy [Policy Text Block]
Comprehensive loss
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Common stock, shares issued (in shares)
Common Stock, Shares, Issued
Cash and cash equivalents
Cash and cash equivalents
Cash and Cash Equivalents, at Carrying Value
Milestone payment
License Agreement Milestone, Payment Upon Achievement
License Agreement Milestone, Payment Upon Achievement
Total operating lease liabilities
Operating Lease, Liability
Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table]
Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table]
Segment Reporting [Abstract]
Segment Reporting [Abstract]
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Total Stockholders’ Equity
Beginning balance
Ending balance
Stockholders' Equity Attributable to Parent
Total purchase consideration
Business Combination, Consideration Transferred
Entity Address, City or Town
Entity Address, City or Town
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
Purchase of intangible assets and capitalized license obligations
One-time upfront payment for finite-lived intangible asset
Payments to Acquire Intangible Assets
Shares underlying unvested restricted stock units
Restricted stock units
Restricted Stock Units (RSUs) [Member]
Employee stock purchase plan, maximum employee subscription rate
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate
2025
Lessee, Operating Lease, Liability, to be Paid, Year Five
Other Assets
Other Assets [Member]
Other nondeductible items
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount
Financial Instrument [Axis]
Financial Instrument [Axis]
Type of Adoption [Domain]
Accounting Standards Update [Domain]
Indefinite-lived Intangible Assets [Axis]
Indefinite-lived Intangible Assets [Axis]
Less: valuation allowance
Deferred Tax Assets, Valuation Allowance
Marketable securities, long-term
Debt Securities, Noncurrent
2023
Finite-Lived Intangible Asset, Expected Amortization, Year Three
Construction in progress
Construction in Progress [Member]
Performance-based restricted stock units
PSUs
Performance Based Restricted Stock Units [Member]
Performance Based Restricted Stock Units
Revenue Recognition under ASC 606
Revenue from Contract with Customer [Policy Text Block]
Investment, Name [Domain]
Investment, Name [Domain]
Other comprehensive income
Other comprehensive gain, net of tax impact
Other Comprehensive Income (Loss), Net of Tax
Leases [Abstract]
Leases [Abstract]
Threshold period for unremedied material breach of the joint venture agreement by the other party
Variable Interest Entity, Threshold Period For Unremedied Material Breach of the Joint Venture Agreement By The Other Party
Variable Interest Entity, Threshold Period For Unremedied Material Breach of the Joint Venture Agreement By The Other Party
Long-term Debt, Type [Axis]
Long-term Debt, Type [Axis]
Total current assets
Assets, Current
Net operating loss carryforwards
Operating Loss Carryforwards
Earnings Per Share [Abstract]
Earnings Per Share [Abstract]
Schedule of the components of deferred tax assets and liabilities
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Other receivables and other assets due from a third-party
Contractual Receivables, Before Allowance For Credit Loss
Contractual Receivables, Before Allowance For Credit Loss
Percentage of precision oncology testing revenue
Royalty Expense, Percentage of Precision Oncology Testing Revenue
Royalty Expense, Percentage of Precision Oncology Testing Revenue
Stockholders’ equity:
Stockholders' Equity Attributable to Parent [Abstract]
2025
Finite-Lived Intangible Asset, Expected Amortization, Year Five
Document Fiscal Period Focus
Document Fiscal Period Focus
Stock issued during period for purchase of asset (in shares)
Stock Issued During Period, Shares, Purchase of Assets
Common stock subject to repurchase
Treasury Stock, Common [Member]
Conversion Period Two
Conversion Period Two [Member]
Conversion Period Two
Deferred Tax Asset [Domain]
Deferred Tax Asset [Domain]
Entity Filer Category
Entity Filer Category
Common Stock
Common stock warrants
Common Stock [Member]
Product and Service [Domain]
Product and Service [Domain]
Concentration Risk Benchmark [Domain]
Concentration Risk Benchmark [Domain]
Defined contribution plan, employer contributions
Defined Contribution Plan, Cost
Geographic Concentration Risk
Geographic Concentration Risk [Member]
Minimum percentage of common stock price trigger
Debt Instrument, Convertible, Maximum Percentage Of Product Of Last Reported Sale Price And Conversion Rate
Debt Instrument, Convertible, Maximum Percentage Of Product Of Last Reported Sale Price And Conversion Rate
Leasehold improvements
Leasehold Improvements [Member]
Revenue
Revenue Benchmark [Member]
Change in estimate of development services revenue
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Prior Year Revenue, Change in Measure of Progress
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Prior Year Revenue, Change in Measure of Progress
Schedule of Equity Method Investments [Line Items]
Schedule of Equity Method Investments [Line Items]
Stated interest rate
Debt Instrument, Interest Rate, Stated Percentage
Equity Incentive Plan Tranche [Axis]
Equity Incentive Plan Tranche [Axis]
Equity Incentive Plan Tranche
Common Class A
Common Class A [Member]
Tax credit carryforwards, research
Deferred Tax Assets, Tax Credit Carryforwards, Research
Issuance of common stock upon exercise of stock options (in shares)
Exercised (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period
Net increase in cash, cash equivalents and restricted cash
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect
Acquisitions
Business Combination Disclosure [Text Block]
Shares underlying outstanding stock options
Stock option
Share-based Payment Arrangement, Option [Member]
Foundation Medicine, Inc. vs. Guardant Health, Inc..
Foundation Medicine, Inc. vs. Guardant Health, Inc. [Member]
Foundation Medicine, Inc. vs. Guardant Health, Inc. [Member]
Costs and operating expenses:
Costs and Expenses [Abstract]
Sale of Stock [Domain]
Sale of Stock [Domain]
State
Deferred State and Local Income Tax Expense (Benefit)
Cash paid for interest
Interest Paid, Excluding Capitalized Interest, Operating Activities
Description of Business
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
Proceeds from initial public offering and follow on offering
Proceeds from Issuance Initial Public Offering
Additional paid-in capital
Additional Paid in Capital
2021
Finite-Lived Intangible Asset, Expected Amortization, Year One
Total revenue
Total revenue
Revenues
Class of Stock [Axis]
Class of Stock [Axis]
Benefit from intraperiod tax allocation
Income Tax Expense (Benefit), Intraperiod Tax Allocation
Equity Incentive Plan Tranche [Domain]
Equity Incentive Plan Tranche [Domain]
Equity Incentive Plan Tranche
Cash paid for income taxes
Income Taxes Paid, Net
Schedule of Restricted Stock Unit Activity
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Net effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations
Cumulative effect adjustment for ASU 2018-07 adoption
Accounting Standards Update 2018-07 [Member]
Total liabilities
Financial and Nonfinancial Liabilities, Fair Value Disclosure
Accrued expenses
Total accrued expenses
Accrued Liabilities, Current
Reconciliation of the balance of total gross unrecognized tax benefits
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
Type of Arrangement and Non-arrangement Transactions [Axis]
Collaborative Arrangement and Arrangement Other than Collaborative [Axis]
Schedule of Stock by Class [Table]
Schedule of Stock by Class [Table]
Goodwill and Intangible Assets, net
Goodwill and Intangible Assets, Policy [Policy Text Block]
Schedule of Long-term Debt Instrument Components
Schedule of Long-term Debt Instruments [Table Text Block]
Depreciation and amortization expense
Depreciation
Entity Address, Address Line One
Entity Address, Address Line One
Non-compete agreements and other covenant rights
Noncompete Agreements [Member]
Entity Emerging Growth Company
Entity Emerging Growth Company
IPR&D
Indefinite-lived Intangible Assets (Excluding Goodwill)
Threshold of consecutive common stock trading days
Debt Instrument, Convertible, Threshold Consecutive Trading Days
Total deferred tax expense
Deferred Income Tax Expense (Benefit)
Obligation Related to Royalty
Obligation Related to Royalty [Policy Text Block]
Obligation Related to Royalty [Policy Text Block]
Net loss
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest
Intangible assets subject to amortization, gross carrying amount
Finite-Lived Intangible Assets, Accumulated Amortization
Maximum
Maximum [Member]
Preferred stock, shares authorized (in shares)
Convertible preferred stock, shares authorized (in shares)
Preferred Stock, Shares Authorized
Stock-based compensation
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost
Schedule of Interest Expense
Interest Income and Interest Expense Disclosure [Table Text Block]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Payments made on royalty obligations
Payment Related to Settlement of Debt and Buyout of Royalty Obligations
Payment Related to Settlement of Debt and Buyout of Royalty Obligations
Trading Symbol
Trading Symbol
Shares available for issuance under the 2018 Incentive Award Plan
2018 Incentive Award Plan [Member]
2018 Incentive Award Plan [Member]
Revenue from related parties
Revenue from Related Parties
Debt discount
Deferred Tax Liability, Debt Discount
Deferred Tax Liability, Debt Discount
Threshold percentage for individual's combined voting power triggering five year option term
Share Based Compensation Arrangement By Share Based Payment Award, Threshold Percentage For Individual's Combined Voting Power Triggering Five Year Option Term
Share Based Compensation Arrangement By Share Based Payment Award, Threshold Percentage For Individual's Combined Voting Power Triggering Five Year Option Term
Contract assets
Contract with Customer, Asset, after Allowance for Credit Loss
Capitalized license fees
Capitalized License Fees
Capitalized License Fees
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Entity Shell Company
Entity Shell Company
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Fair value, measurements, recurring
Fair Value, Recurring [Member]
Segment Information
Segment Reporting, Policy [Policy Text Block]
Entity Public Float
Entity Public Float
Revenue from cash collections exceeding estimated variable consideration
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Estimate of Transaction Price
Warrants and Rights Note Disclosure [Abstract]
Warrants and Rights Note Disclosure [Abstract]
Operating lease liabilities
Long-Term Operating Lease Liabilities Net Of Right Of Use Assets
Long-Term Operating Lease Liabilities Net Of Right Of Use Assets
Business Combinations
Business Combinations Policy [Policy Text Block]
SoftBank
SoftBank [Member]
SoftBank [Member]
Document Type
Document Type
ICFR Auditor Attestation Flag
ICFR Auditor Attestation Flag
Other income
Other Nonoperating Income (Expense)
Granted (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross
Financing receivable, net amount, noncurrent
Contractual Receivables, After Allowance For Credit Loss, Net, Noncurrent
Contractual Receivables, After Allowance For Credit Loss, Net, Noncurrent
Schedule of Intangible Assets Acquired
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]
Weighted-average grant date fair value, vested and released (in usd per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
IPR&D
In Process Research and Development [Member]
Schedule of components of loss before provision for income taxes
Schedule Of Components Before Income Tax Expense Benefit [Table Text Block]
Schedule Of Components Before Income Tax Expense Benefit [Table Text Block]
Level 3
Fair Value, Inputs, Level 3 [Member]
Leases
Lessee, Leases [Policy Text Block]
Repurchase of common and convertible preferred stock (in shares)
Stock Repurchased During Period, Shares
Intangible assets, net
Intangible Assets, Net (Excluding Goodwill)
Proceeds from borrowings on convertible senior notes, net
Proceeds from Convertible Debt
Discount for post-vesting restrictions
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Discount for Postvesting Restrictions
Changes in operating assets and liabilities, net of effect of acquisition:
Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract]
Loss from operations
Operating Income (Loss)
Deferred revenue
Deferred Revenue, Current
Common Stock Sold Under Underwriting Agreement
Common Stock Sold Under Underwriting Agreement [Member]
Common Stock Sold Under Underwriting Agreement
Contractual receivables, credit loss
Charged to (Reversed from) other income (expense), net, allowance for credit loss, noncurrent
Contractual Receivables, Credit Loss, Expense (Reversal), Noncurrent
Contractual Receivables, Credit Loss, Expense (Reversal), Noncurrent
Customer B
Customer B [Member]
Customer B
Schedule of Business Acquisitions, by Acquisition [Table]
Schedule of Business Acquisitions, by Acquisition [Table]
Commitments and contingencies (Note 10)
Commitments and Contingencies
Defined contribution plan, maximum annual employee contributions per employee, percent
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent
Taxes paid related to net share settlement of restricted stock units
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation
Tranche 2 - $150 per share
Share-based Payment Arrangement, Tranche Two [Member]
Repurchase of common stock
Payments for Repurchase of Common Stock
Vesting period
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period
Purchase of convertible senior note hedges
Purchase of convertible senior note hedges
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Hedges
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Hedges
2026 and thereafter
Lessee, Operating Lease, Liability, to be Paid, after Year Five
Furniture and fixtures
Furniture and Fixtures [Member]
Entity Address, State or Province
Entity Address, State or Province
Restricted stock units outstanding, vested and released (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period
Tax at the statutory federal rate
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount
Accounts payable
Accounts Payable, Current
Unrealized translation gains on obligation related to royalty
Unrealized Translations Gain (Loss) On Obligation Related To Royalty
Unrealized Translations Gain (Loss) On Obligation Related To Royalty
Other Commitments [Table]
Other Commitments [Table]
Beginning balance, financing receivable, allowance for credit loss, noncurrent
Ending balance, financing receivable, allowance for credit loss, noncurrent
Contractual Receivables, Allowance For Credit Loss, Noncurrent
Contractual Receivables, Allowance For Credit Loss, Noncurrent
Accumulated deficit
Retained Earnings (Accumulated Deficit)
Right-of-use assets
Operating Lease, Right-of-Use Asset
Less: debt discount, net of amortization
Debt Instrument, Unamortized Discount
Property and equipment
Deferred Tax Liabilities, Property, Plant and Equipment
Customer [Axis]
Customer [Axis]
Weighted-average estimate lease term
Lessee, Operating Lease, Lease Not Yet Commenced, Weighted Average Term of Contract
Lessee, Operating Lease, Lease Not Yet Commenced, Weighted Average Term of Contract
Income Taxes
Income Tax, Policy [Policy Text Block]
Early exercise employee stock option
Early Exercise Employee Stock Option [Member]
Early Exercise Employee Stock Option
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-Lived Intangible Assets [Line Items]
Percentage of the product
Variable Interest Entity, Percentage of the Product
Variable Interest Entity, Percentage of the Product
Patent and Covenant Rights
Patent and Covenant Rights [Member]
Patent and Covenant Rights [Member]
Stock-based compensation
APIC, Share-based Payment Arrangement, Increase for Cost Recognition
Number of lease agreements, not yet commenced
Number Of Operating Leases, Lease Not yet Commenced
Number Of Operating Leases, Lease Not yet Commenced
Advertising expense
Advertising Expense
Common stock share price (in dollars per share)
Share Price
Business Acquisition [Axis]
Business Acquisition [Axis]
Geographical [Domain]
Geographical [Domain]
Conversion ratio
Debt Instrument, Convertible, Conversion Ratio
Foreign
Deferred Foreign Income Tax Expense (Benefit)
Senior Notes Due 2027
Convertible Senior Notes Due 2027 [Member]
Convertible Senior Notes Due 2027
Entity Voluntary Filers
Entity Voluntary Filers
Acquisition related costs
Business Combination, Acquisition Related Costs
Contingent consideration liability , other long term liabilities
Business Combination, Contingent Consideration, Liability, Noncurrent
2026 and thereafter
Finite-Lived Intangible Asset, Expected Amortization, after Year Five
Estimated fair value
Debt Instrument, Fair Value Disclosure
Preferred stock, shares issued (in shares)
Preferred Stock, Shares Issued
Business Combinations [Abstract]
Business Combinations [Abstract]
Net loss per share attributable to common stockholders, basic and diluted (in usd per share)
Earnings Per Share, Basic and Diluted
Obligation related to royalty
Accrued Royalties, Noncurrent
Accrued Royalties, Noncurrent
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Debt Instrument, Conversion [Axis]
Debt Instrument, Conversion [Axis]
Debt Instrument, Conversion
Options vested and exercisable, Weighted average remaining contractual term (in years)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term
Proceeds from public offerings of common stock
Proceeds from Issuance of Common Stock
Financing receivable, gross amount, current
Contractual Receivables, Before Allowance For Credit Loss, Gross, Current
Contractual Receivables, Before Allowance For Credit Loss, Gross, Current
Schedule of Earnings Per Share, Basic and Diluted
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Contingent Consideration Type [Domain]
Contingent Consideration Type [Domain]
Balance Sheet Related Disclosures [Abstract]
Balance Sheet Related Disclosures [Abstract]
Research and Development Expenses
Research and Development Expense, Policy [Policy Text Block]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
Fair Value Measurements, Recurring and Nonrecurring
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
Net cash used in operating activities
Net Cash Provided by (Used in) Operating Activities
Entity Central Index Key
Entity Central Index Key
Related Party [Domain]
Related Party [Domain]
Litigation settlement, expense
Litigation Settlement, Expense
Number of reporting units
Number of Reporting Units
Related Party Transaction [Line Items]
Related Party Transaction [Line Items]
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets by Major Class [Axis]
Schedule of Finite-Lived Intangible Assets
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Convertible senior notes
Senior Notes [Member]
Geographical [Axis]
Geographical [Axis]
Change in valuation allowance
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount
Amortized cost, marketable securities, available-for-sale
Debt Securities, Available-for-sale, Amortized Cost
Gross Unrealized Gain
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax
Statement of Cash Flows [Abstract]
Statement of Cash Flows [Abstract]
Income Taxes [Table]
Income Taxes [Table]
Income Taxes [Table]
Income Statement Location [Axis]
Income Statement Location [Axis]
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Accounts Receivable
Receivable [Policy Text Block]
Amortization of intangible assets
Amortization of Intangible Assets
2012 Stock Plan
2012 Stock Plan [Member]
2012 Stock Plan
Investment in Joint Venture
Equity Method Investments and Joint Ventures Disclosure [Text Block]
Threshold percentage of common stock price trigger
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger
Segment and Geographic Information
Segment Reporting Disclosure [Text Block]
Issuance of common stock upon follow-on offering, net of offering costs
Stock Issued During Period, Value, New Issues
Long-term marketable securities
Marketable Securities, Noncurrent
Unrealized gain/loss on investments
Deferred Tax Liabilities, Unrealized Gains on Trading Securities
Title of 12(b) Security
Title of 12(b) Security
Schedule of Accrued Liabilities
Schedule of Accrued Liabilities [Table Text Block]
Capitalized license fees
Intangible assets subject to amortization, net
Finite-Lived Intangible Assets, Net
Weighted average grant date fair value, grants in period (in usd per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
Accrued tax liabilities
Accrued Income Taxes, Current
Unrealized gain on available-for-sale securities
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax
Chief Executive Officer
Chief Executive Officer [Member]
Vesting [Domain]
Vesting [Domain]
Interest expense
Interest Expense
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Depreciation and amortization
Depreciation, Depletion and Amortization
Schedule of components of the provision for income taxes
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Unrecognized tax benefits, period increase (decrease)
Unrecognized Tax Benefits, Period Increase (Decrease)
Product and Service [Axis]
Product and Service [Axis]
Stock based compensation not recognized, period for recognition (years)
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition
International
Non-US [Member]
Guardant360CDx
Guardant360CDx [Member]
Guardant360CDx
Deferred revenue, revenue recognized
Contract with Customer, Liability, Revenue Recognized
Allowance for Credit Losses
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Proceeds from issuance of common stock under employee stock purchase plan
Proceeds, Issuance of Shares, Share-based Payment Arrangement, Excluding Option Exercised
Net loss attributable to Guardant Health, Inc. common stockholders
Net loss attributable to Guardant Health, Inc. common stockholders, basic and diluted
Net Income (Loss) Available to Common Stockholders, Basic
Operating lease expense
Operating Lease, Expense
Cost of precision oncology testing
Costs of Precision Oncology Testing
Costs of Precision Oncology Testing
Deferred offering costs
Deferred Offering Costs
Fair Value Measurements, Recurring and Nonrecurring [Table]
Fair Value, Recurring and Nonrecurring [Table]
Asset Acquisition [Domain]
Asset Acquisition [Domain]
Asset Acquisition
Accounts payable
Increase (Decrease) in Accounts Payable
Debt Instrument [Axis]
Debt Instrument [Axis]
Antidilutive Securities, Name [Domain]
Antidilutive Securities, Name [Domain]
Contingent Consideration by Type [Axis]
Contingent Consideration by Type [Axis]
Assets
Assets [Member]
Class of Stock [Line Items]
Class of Stock [Line Items]
Adjustments to reconcile net loss to net cash used in operating activities:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Litigation Case [Axis]
Litigation Case [Axis]
State taxes, net of federal benefits
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount
Beginning balance, financing receivable, allowance for credit loss, current
Ending balance, financing receivable, allowance for credit loss, current
Contractual Receivables, Allowance For Credit Loss, Current
Contractual Receivables, Allowance For Credit Loss, Current
Research and development expense
Research and Development Expense
Federal
Domestic Tax Authority [Member]
Concentration Risk Type [Axis]
Concentration Risk Type [Axis]
U.S. government debt securities
US Government Debt Securities [Member]
Revenue Recognition under ASC 605
Revenue [Policy Text Block]
Service period
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period
Long-term operating lease liabilities
Operating Lease, Liability, Noncurrent
2024
Finite-Lived Intangible Asset, Expected Amortization, Year Four
United States
Income (Loss) from Continuing Operations before Equity Method Investments, Federal, Income Taxes, Noncontrolling Interest
Income (Loss) from Continuing Operations before Equity Method Investments, Federal, Income Taxes, Noncontrolling Interest
Acquired license
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles
Current assets:
Assets, Current [Abstract]
Interest income
Investment Income, Interest
Comprehensive loss attributable to Guardant Health, Inc.
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Cost of precision oncology testing
Precision Oncology Testing [Member]
Precision Oncology Testing [Member]
Expected dividend yield (percent)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Preferred stock, par value (in usd per share)
Preferred Stock, Par or Stated Value Per Share
Debt Securities, Available-for-sale
Debt Securities [Table Text Block]
Debt Securities [Table Text Block]
Documents Incorporated by Reference
Documents Incorporated by Reference [Text Block]
Effective tax rate reconciliation
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Legal Entity [Axis]
Legal Entity [Axis]
City Area Code
City Area Code
Commercialization Milestones
Commercialization Milestones [Member]
Commercialization Milestones [Member]
Income Tax Authority [Axis]
Income Tax Authority [Axis]
Document Period End Date
Document Period End Date
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]
Net loss
Net loss
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Impairment for Long-Lived Assets
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]
Lease term
Lessee, Operating Lease, Term of Contract
Number of MSUs (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected To Vest
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected To Vest
Payment in connection with a license agreement
Payments In Connection With License Agreements
Payments In Connection With License Agreements
Asset acquisition, transaction costs
Asset Acquisition, Transaction Costs
Asset Acquisition, Transaction Costs
Schedule of Stock Based Compensation Expense
Share-based Payment Arrangement, Cost by Plan [Table Text Block]
Long-term Debt, Type [Domain]
Long-term Debt, Type [Domain]
Non-cash stock-based compensation
Share-based Payment Arrangement, Noncash Expense
Repurchase of common stock
Stock Repurchased During Period, Value
Cover [Abstract]
Cover [Abstract]
Measurement Input Type [Axis]
Measurement Input Type [Axis]
Gross Carrying Amount
Intangible Assets, Gross (Including Goodwill)
Intangible Assets, Gross (Including Goodwill)
Cash and Cash Equivalents [Domain]
Cash and Cash Equivalents [Domain]
Net carrying amount
Long-term Debt
Leases
Lessee, Operating Leases [Text Block]
Amortization of premium (discount) on marketable securities
Accretion (Amortization) of Discounts and Premiums, Investments
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Axis]
Total costs and operating expenses
Costs and Expenses
Equity Components [Axis]
Equity Components [Axis]
Intangible assets
Deferred Tax Asset, Valuation Allowance, Intangible Assets Acquired [Member]
Deferred Tax Asset, Valuation Allowance, Intangible Assets Acquired
Accrued legal expenses
Estimated Litigation Liability, Legal Fees, Current
Estimated Litigation Liability, Legal Fees, Current
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Total deferred tax asset
Deferred Tax Assets, Gross
Minimum
Minimum [Member]
Market-based stock units holding period during vesting
Share-based Compensation Arrangement by Share-based Payment Award, Holding Period During Vesting
Share-based Compensation Arrangement by Share-based Payment Award, Holding Period During Vesting
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
Development services and other
Revenue from Development Services
Revenue from Development Services
Stock based compensation not recognized, restricted stock
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments and Joint Ventures [Abstract]
Entity Interactive Data Current
Entity Interactive Data Current
United States
UNITED STATES
Exercised (in usd per share)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price
Revenue:
Revenues [Abstract]
OPERATING ACTIVITIES:
Net Cash Provided by (Used in) Operating Activities [Abstract]
Common Stock
Warrants
Stockholders' Equity Note Disclosure [Text Block]
Schedule of Stock Option Activity
Share-based Payment Arrangement, Option, Activity [Table Text Block]
Stock-Based Compensation
Share-based Payment Arrangement [Policy Text Block]
Financing receivable, net amount, noncurrent
Contractual Receivables, Before Allowance For Credit Loss, Gross, Noncurrent
Contractual Receivables, Before Allowance For Credit Loss, Gross, Noncurrent
Foreign
Current Foreign Tax Expense (Benefit)
Maximum special interest rate percentage
Debt Instrument, Maximum Interest Rate, Special Interest Rate Percentage
Debt Instrument, Maximum Interest Rate, Special Interest Rate Percentage
Class of Warrant or Right [Domain]
Class of Warrant or Right [Domain]
Statement of Stockholders' Equity [Abstract]
Statement of Stockholders' Equity [Abstract]
Conversion of convertible preferred stock to common stock upon initial public offering (in shares)
Stock Issued During Period, Shares, Conversion of Convertible Preferred Stock to Common Stock Upon Initial Public Offering
Stock Issued During Period, Shares, Conversion of Convertible Preferred Stock to Common Stock Upon Initial Public Offering
Total deferred tax liabilities
Deferred Tax Liabilities, Gross
Advertising
Advertising Cost [Policy Text Block]
Re-valuation of contingent consideration
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability
Issuance of equity interests in redeemable noncontrolling interest
Temporary Equity, Stock Issued During Period, Value, New Issues
Notes Hedges, strike price (in dollars per share)
Convertible Debt, Hedge, Strike Price
Convertible Debt, Hedge, Strike Price
Schedule of Equity Method Investments [Table]
Schedule of Equity Method Investments [Table]
Effective interest rate of the liability component
Debt Instrument, Interest Rate, Effective Percentage
Research and development expense
Research and Development Expense [Member]
Accounts receivable, net
Accounts Receivable, after Allowance for Credit Loss, Current
Total operating lease payments
Lessee, Operating Lease, Liability, to be Paid
Other
Deferred Tax Assets, Other
Threshold of common stock trading days
Debt Instrument, Convertible, Threshold Trading Days
Deferred tax liabilities:
Components of Deferred Tax Liabilities [Abstract]
Conversion Period Three
Conversion Period Three [Member]
Conversion Period Three
Foreign Currency Translations
Foreign Currency Transactions and Translations Policy [Policy Text Block]
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)
Weighted Average Number of Shares Outstanding, Basic and Diluted
Document Transition Report
Document Transition Report
Title of Individual [Axis]
Title of Individual [Axis]
Schedule of Employee Stock Purchase Plan Valuation Assumptions
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]
Deferred:
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Level 2
Fair Value, Inputs, Level 2 [Member]
Vesting [Axis]
Vesting [Axis]
Current:
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Accounts receivable, related parties
Accounts Receivable, Related Parties
General and administrative expense
General and Administrative Expense [Member]
Consolidated Balance Sheet Components
Additional Financial Information Disclosure [Text Block]
Cumulative Effect, Period of Adoption [Axis]
Cumulative Effect, Period of Adoption [Axis]
Conversion price (in dollars per share)
Debt Instrument, Convertible, Conversion Price
Deferred tax assets:
Components of Deferred Tax Assets [Abstract]
Litigation Case [Domain]
Litigation Case [Domain]
Expected term (years)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term
Entity File Number
Entity File Number
Weighted-average remaining lease term (in years)
Operating Lease, Weighted Average Remaining Lease Term
Shares canceled (in shares)
Shares forfeited (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options Available for Grant, Forfeitures in Period, Gross
Share-based Compensation Arrangement by Share-based Payment Award, Options Available for Grant, Forfeitures in Period, Gross
Common stock, par value of $0.00001 per share; 350,000,000 shares authorized as of December 31, 2020 and 2019; 100,213,985 and 94,261,414 shares issued and outstanding as of December 31, 2020 and 2019, respectively
Common Stock, Value, Outstanding
Net proceeds from issuance of equity interests in redeemable noncontrolling interest
Proceeds from Noncontrolling Interests
Dividends
Dividends, Common Stock
Conversion of convertible preferred stock to common stock upon initial public offering
Conversion of Stock Upon Initial Public Offering
Conversion of Stock Upon Initial Public Offering
Amount awarded from other party
Litigation Settlement, Amount Awarded from Other Party
Share-based compensation expense
Total stock-based compensation expense
Share-based Payment Arrangement, Expense
Balance Sheet Location [Axis]
Balance Sheet Location [Axis]
Common stock issued under employee stock purchase plan
Stock Issued During Period, Value, Employee Stock Purchase Plan
Remaining performance obligation, expected recognition period
Revenue, Remaining Performance Obligation, Optional Exemption, Remaining Duration
Goodwill and Intangible Assets Disclosure [Abstract]
Document Annual Report
Document Annual Report
Options vested and exercisable, Aggregate intrinsic value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value
Retirement Benefits [Abstract]
Retirement Benefits [Abstract]
Threshold percentage of fair value that is no less than internal rate of return
Variable Interest Entity, Threshold Percentage of Fair Value that is No Less Than Internal Rate of Return
Variable Interest Entity, Threshold Percentage of Fair Value that is No Less Than Internal Rate of Return
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-term Debt Instruments [Table]
Shares issued during period, exercise of warrants prior to IPO (in shares)
Stock Issued During Period, Shares, Exercise of Warrants Prior to IPO
Stock Issued During Period, Shares, Exercise of Warrants Prior to IPO
Total
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net
Asset Acquisition [Axis]
Asset Acquisition [Axis]
Asset Acquisition [Axis]
Amortized cost, cash and cash equivalents and marketable securities available-for-sale
Debt Securities, Available-for-sale, and Cash and Cash Equivalents Amortized Cost
Debt Securities, Available-for-sale, and Cash and Cash Equivalents Amortized Cost
Weighted-average grant date fair value, granted (in usd per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Dividend rate (in usd per share)
Preferred Stock, Dividend Rate, Per-Dollar-Amount
Conversion Period One
Conversion Period One [Member]
Conversion Period One
INVESTING ACTIVITIES:
Net Cash Provided by (Used in) Investing Activities [Abstract]
Beginning balance
Ending balance
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests
Convertible Senior Notes
Debt, Policy [Policy Text Block]
Valuation Allowance by Deferred Tax Asset [Axis]
Valuation Allowance by Deferred Tax Asset [Axis]
Series B Convertible Preferred Stock
Series B Convertible Preferred Stock [Member]
Series B Convertible Preferred Stock [Member]
Accounts receivable
Increase (Decrease) in Accounts Receivable
Statement of Comprehensive Income [Abstract]
Statement of Comprehensive Income [Abstract]
Payment of offering costs related to public offerings of common stock
Payments of Stock Issuance Costs
Concentration Risk Type [Domain]
Concentration Risk Type [Domain]
Rent expense
Operating Leases, Rent Expense, Net
Total Liabilities, Redeemable Noncontrolling Interest and Stockholders’ Equity
Liabilities and Equity
Cumulative effect adjustment for Topic 606 adoption
Accounting Standards Update 2014-09 [Member]
Accumulated other comprehensive income
Accumulated Other Comprehensive Income (Loss), Net of Tax
Income Taxes
Income Tax Disclosure [Text Block]
Schedules of Concentration of Risk, by Risk Factor
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
Net liabilities assumed
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities
General and administrative expense
General and Administrative Expense
Antidilutive securities excluded from computation of earnings per share (in shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Total current tax expense
Current Income Tax Expense (Benefit)
Series D Convertible Preferred Stock
Series D Convertible Preferred Stock [Member]
Series D Convertible Preferred Stock [Member]
Credit loss adjustment and others
Other Noncash Income (Expense)
Increases related to prior years’ tax positions
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions
Increases related to current year’s tax positions
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions
Intangible assets, useful life
Intangible assets, useful life
Finite-Lived Intangible Asset, Useful Life
Equity Component [Domain]
Equity Component [Domain]
Computer hardware and computer software
Computer Equipment and Software [Member]
Computer Equipment and Software [Member]
Property and equipment, net
Property and equipment, net
Property, Plant and Equipment, Net
Related party transaction, sale of commons stock (in shares)
Related Party Transaction, Sale Of Common Stock
Related Party Transaction, Sale Of Common Stock
Entity Tax Identification Number
Entity Tax Identification Number
Lessee, Lease, Description [Table]
Lessee, Lease, Description [Table]
Stock-Based Compensation
Share-based Payment Arrangement [Text Block]
Net amount recorded in equity
Debt Instrument, Convertible, Carrying Amount of Equity Component
Current Fiscal Year End Date
Current Fiscal Year End Date
Identified intangible assets
Identified intangible assets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill
Number of securities called by warrants (in shares)
Class of Warrant or Right, Number of Securities Called by Warrants or Rights
Research and development credits
Deferred Tax Assets, Tax Credit Carryforwards
Shares Subject to Options Outstanding
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Subsidiary, Sale of Stock [Line Items]
Subsidiary, Sale of Stock [Line Items]
Total stock options approved and granted (in shares)
Granted (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options Available for Grant, Grants in Period, Gross
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross
Supplemental Disclosures of Cash Flow Information:
Supplemental Cash Flow Information [Abstract]
Business Acquisition, Acquiree [Domain]
Business Acquisition, Acquiree [Domain]
Common stock issued under employee stock purchase plan (in shares)
Common stock issued under employee stock purchase plan (in shares)
Stock Issued During Period, Shares, Employee Stock Purchase Plans
Royalty expense
Royalty Expense
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment [Line Items]
Purchases of property and equipment included in accounts payable and accrued expenses
Increase (Decrease) In Capital Expenditures Incurred But Not Yet Paid
Increase (Decrease) In Capital Expenditures Incurred But Not Yet Paid
Adjustment of redeemable noncontrolling interest
Adjustment of redeemable noncontrolling interest
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest
Property, Plant and Equipment, Type [Domain]
Long-Lived Tangible Asset [Domain]
Asset Acquisition
Asset Acquisition Policy [Policy Text Block]
Asset Acquisition Policy
Convertible Debt
Convertible Debt
Convertible Debt [Member]
Purchases of property and equipment included in accrued expenses
Accrued Expenses, Property and Equipment, Current
Accrued Expenses, Property and Equipment, Current
Property, Plant and Equipment
Property, Plant and Equipment [Table Text Block]
Costs of Precision Oncology Testing
Costs of Precision Oncology Testing [Policy Text Block]
Costs of Precision Oncology Testing [Policy Text Block]
Debt issuance costs included in accounts payable and accrued expenses
Debt Issuance Costs Incurred During Noncash or Partial Noncash Transaction
Deferred offering costs included in accounts payable and accrued expenses
Offering Costs Incurred but Not yet Paid
Offering Costs Incurred but Not yet Paid
Discount rate used to calculate present value of future minimum royalty payments
Debt Instrument, Measurement Input
Issuance of common stock upon follow-on offering, net of offering costs (in shares)
Stock Issued During Period, Shares, New Issues
Intangible assets subject to amortization
Finite-Lived Intangible Assets, Gross
Issuance of common stock upon initial and follow-on offering, net of issuance costs (in shares)
Issuance of convertible preferred stock, net of issuance costs (in shares)
Stock Issued During Period, Shares, Conversion of Convertible Securities
Money market funds
Money Market Funds [Member]
Less: accumulated depreciation and amortization
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Preferred stock, par value of $0.00001 per share; 10,000,000 shares authorized, no shares issued and outstanding as of December 31, 2020 and 2019
Preferred Stock, Value, Outstanding
Related Party Transactions [Abstract]
Related Party Transactions [Abstract]
Number of petitions filed
Number of Petitions Filed
Number of Petitions Filed
Schedule of Operating Lease Liability Maturities
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
Redeemable Noncontrolling Interest
Redeemable Noncontrolling Interest [Member]
Redeemable Noncontrolling Interest [Member]
Basis of Presentation
Basis of Accounting, Policy [Policy Text Block]
Other
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount
Risk free interest rate
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate
Canceled (in usd per share)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price
Financing receivable, net amount, current
Contractual Receivables, After Allowance For Credit Loss Net, Current
Contractual Receivables, After Allowance For Credit Loss Net, Current
Accrued expenses and other current liabilities
Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities
Increase (Decrease) in Temporary Equity [Roll Forward]
Increase (Decrease) in Temporary Equity [Roll Forward]
Plan Name [Domain]
Plan Name [Domain]
Entity Well-known Seasoned Issuer
Entity Well-known Seasoned Issuer
Equity method investment, ownership percentage
Equity Method Investment, Ownership Percentage
Operating lease liabilities arising from obtaining right-of-use assets
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability
Maximum contingent liability
Business Combination, Contingent Consideration, Maximum Amount Payable
Business Combination, Contingent Consideration, Maximum Amount Payable
Inventory
Inventory, Policy [Policy Text Block]
Provision for (benefit from) income taxes
Total provision for income taxes
Income Tax Expense (Benefit)
Cash, cash equivalents and restricted cash – Beginning of period
Cash and cash equivalents – End of period
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Property and Equipment, Net
Property, Plant and Equipment, Policy [Policy Text Block]
Debt Securities, Available-for-sale [Table]
Debt Securities, Available-for-sale [Table]
Relationship to Entity [Domain]
Title of Individual [Domain]
Indefinite-lived Intangible Assets, Major Class Name [Domain]
Indefinite-lived Intangible Assets, Major Class Name [Domain]
Local Phone Number
Local Phone Number
Cash paid upon closing
Payments to Acquire Businesses, Gross
Cumulative Effect, Period of Adoption [Domain]
Cumulative Effect, Period of Adoption [Domain]
Tranche 1 - $120 per share
Share-based Payment Arrangement, Tranche One [Member]
Exercises in period, intrinsic value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value
Schedule of Level 3 Activity
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Schedule of Indefinite-Lived Intangible Assets
Schedule of Indefinite-Lived Intangible Assets [Table Text Block]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Deferred revenue
Contract with Customer, Liability
Related Party Transaction [Domain]
Related Party Transaction [Domain]
Other assets
Increase (Decrease) in Other Operating Assets
Issuance of common stock upon exercise of stock options
Stock Issued During Period, Value, Stock Options Exercised
Convertible preferred stock (on an as if converted basis)
Convertible Preferred Stock [Member]
Schedule of Finite-Lived Intangible Assets [Table]
Schedule of Finite-Lived Intangible Assets [Table]
Award Type [Axis]
Award Type [Axis]
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]
Amortization of debt issuance costs
Amortization of Debt Issuance Costs
Restricted cash
Restricted Cash
Accumulated Deficit
Retained Earnings [Member]
Preferred stock, shares outstanding (in shares)
Preferred Stock, Shares Outstanding
Summary of Significant Accounting Policies
Significant Accounting Policies [Text Block]
Net cash used in investing activities
Net Cash Provided by (Used in) Investing Activities
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options outstanding, Weighted average remaining contractual term (in years)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term
Equity Award [Domain]
Award Type [Domain]
Corporate bonds
Corporate Debt Securities [Member]
Options vested and exercisable, Weighted average exercise price per share (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price
Foreign
Income (Loss) from Continuing Operations before Equity Method Investments, Foreign, Income Taxes, Noncontrolling Interest
Income (Loss) from Continuing Operations before Equity Method Investments, Foreign, Income Taxes, Noncontrolling Interest
Net Loss Per Share Attributable to Guardant Health, Inc. Common Stockholders
Earnings Per Share [Text Block]
Vesting of common stock exercised early
Vesting of common stock exercised early
Stock Issued During Period, Value, Stock Options Exercised Early
Stock Issued During Period, Value, Stock Options Exercised Early
Redeemable noncontrolling interest
Redeemable Noncontrolling Interest, Equity, Carrying Amount
Current liabilities:
Liabilities, Current [Abstract]
Repurchase of early exercised shares (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Shares Available For Grant, Repurchase of Early Exercised Shares
Share-based Compensation Arrangement by Share-based Payment Award, Shares Available For Grant, Repurchase of Early Exercised Shares
Accounting Pronouncements Adopted and Not Yet Adopted
New Accounting Pronouncements, Policy [Policy Text Block]
Discount Rate
Measurement Input, Discount Rate [Member]
Statement of Financial Position [Abstract]
Statement of Financial Position [Abstract]