Entity Central Index Key Service and other revenue. Consoles product. Consumables product. Cover [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Quarterly Report Document Quarterly Report Document Transition Report Document Transition Report Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Current Fiscal Year End Date Current Fiscal Year End Date Document Fiscal Period Focus Document Fiscal Period Focus Entity File Number Entity File Number Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Incorporation, State or Country Code Entity Incorporation State Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address Address Line1 Entity Address, City or Town Entity Address City Or Town Entity Address, State or Province Entity Address State Or Province Entity Address, Postal Zip Code Entity Address Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Title of 12(b) Security Security12b Title Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Ex Transition Period Entity Ex Transition Period Entity Shell Company Entity Shell Company Entity Bankruptcy Proceedings, Reporting Current Entity Bankruptcy Proceedings Reporting Current Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Accrued expenses and other current liabilities. Accrued interest, noncurrent. Redeemable convertible preferred stock warrant liability. Statement Of Financial Position [Abstract] Statement [Table] Statement [Table] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Redeemable Convertible Preferred Stock Redeemable Convertible Preferred Stock [Member] Statement [Line Items] Statement [Line Items] Assets Assets [Abstract] Current assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Short-term investments Short Term Investments Accounts receivable, net Accounts Receivable Net Current Inventories Inventory Net Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Total current assets Assets Current Restricted cash Restricted Cash Noncurrent Property and equipment, net Property Plant And Equipment Net Operating lease right-of-use assets Operating Lease Right Of Use Asset Other assets Other Assets Noncurrent Total assets Assets Labilities, redeemable convertible preferred stock and stockholders' equity (deficit) Liabilities And Stockholders Equity [Abstract] Current liabilities: Liabilities Current [Abstract] Accounts payable Accounts Payable Current Accrued compensation and related benefits Accrued Employee Benefits Current Accrued expenses and other current liabilities Accrued Expenses And Other Current Liabilities Accrued warranty liability Product Warranty Accrual Classified Current Deferred revenue, current Contract With Customer Liability Current Operating lease liabilities, current Operating Lease Liability Current Term loan, current Long Term Debt Current Total current liabilities Liabilities Current Accrued interest, noncurrent Accrued Interest Noncurrent Deferred revenue, noncurrent Contract With Customer Liability Noncurrent Operating lease liabilities, noncurrent Operating Lease Liability Noncurrent Redeemable convertible preferred stock warrant liability Redeemable Convertible Preferred Stock Warrant Liability Term loan, noncurrent Long Term Debt Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 6) Commitments And Contingencies Redeemable convertible preferred stock, $0.001 par value; no shares authorized and no shares issued and outstanding as of September 30, 2020; 154,592 shares authorized and 147,214 shares issued and outstanding as of December 31, 2019 Temporary Equity Carrying Amount Attributable To Parent Stockholders' equity (deficit): Stockholders Equity [Abstract] Preferred stock, $0.001 par value; 5,000 shares authorized, and no shares issued and outstanding as of September 30, 2020 and December 31, 2019 Preferred Stock Value Common stock, $0.001 par value; 300,000 and 240,000 shares authorized as of September 30, 2020 and December 31, 2019, respectively; 42,701 and 922 shares issued and outstanding as of September 30, 2020 and December 31, 2019, respectively Common Stock Value Additional paid-in capital Additional Paid In Capital Common Stock Accumulated other comprehensive income Accumulated Other Comprehensive Income Loss Net Of Tax Accumulated deficit Retained Earnings Accumulated Deficit Total stockholders' equity (deficit) Stockholders Equity Total liabilities, redeemable convertible preferred stock and stockholders' equity (deficit) Liabilities And Stockholders Equity Redeemable convertible preferred stock, par value Temporary Equity Par Or Stated Value Per Share Redeemable convertible preferred stock, shares authorized Temporary Equity Shares Authorized Redeemable convertible preferred stock, shares issued Temporary Equity Shares Issued Redeemable convertible preferred stock, shares outstanding Temporary Equity Shares Outstanding Preferred stock, par value Preferred Stock Par Or Stated Value Per Share Preferred stock, shares authorized Preferred Stock Shares Authorized Preferred stock, shares issued Preferred Stock Shares Issued Preferred stock, shares outstanding Preferred Stock Shares Outstanding Common stock, par value Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Common stock, shares outstanding Common Stock Shares Outstanding Change in fair value of redeemable convertible preferred stock warrant liability. Net income (loss) attributable to common stockholders, basic and diluted. Income Statement [Abstract] Product and Service Product Or Service [Axis] Product and Service Products And Services [Domain] Product Revenue Product [Member] Service and Other Revenue Service And Other Revenue [Member] Revenue: Revenues [Abstract] Revenue Revenue From Contract With Customer Excluding Assessed Tax Cost of revenue: Cost Of Revenue [Abstract] Cost of revenue Cost Of Goods And Services Sold Gross profit Gross Profit Operating expenses: Operating Expenses [Abstract] Research and development Research And Development Expense Sales and marketing Selling And Marketing Expense General and administrative General And Administrative Expense Total operating expenses Operating Expenses Loss from operations Operating Income Loss Interest income and other income (expense), net Nonoperating Income Expense Interest expense Interest Expense Change in fair value of redeemable convertible preferred stock warrant liability Change In Fair Value Of Redeemable Convertible Preferred Stock Warrant Liability Loss on extinguishment of term loan Gains Losses On Extinguishment Of Debt Loss before provision for income taxes Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Provision for income taxes Income Tax Expense Benefit Net loss Net Income Loss Net loss attributable to common stockholders, basic and diluted Net Income Loss Attributable To Common Stockholders Basic And Diluted Net loss per share attributable to common stockholders, basic and diluted Earnings Per Share Basic And Diluted Weighted average shares used in computing net loss per share attributable to common stockholders, basic and diluted Weighted Average Number Of Share Outstanding Basic And Diluted Statement Of Income And Comprehensive Income [Abstract] Net loss Other comprehensive income (loss): Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent [Abstract] Unrealized gain (loss) on available-for-sale securities Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax Comprehensive loss Comprehensive Income Net Of Tax Temporary equity stock issued during period shares new issues. Temporary equity settlement of accrued dividend. Stock issued during period shares stock dividend. Deemed dividend on settlement of accrued dividend. Temporary equity deemed dividend on settlement of accrued dividend. Temporary equity adjustment to redemption value on redeemable convertible preferred stock. Temporary equity stock issued during period shares redeemable convertible preferred stock warrants. Temporary equity stock issued during period value redeemable convertible preferred stock warrants. Stock issued during period, shares redeemable convertible preferred stock warrants. Stock issued during period, value redeemable convertible preferred stock warrants. Temporary equity cash exercises of redeemable convertible preferred stock warrants shares. Temporary equity cash exercises of redeemable convertible preferred stock warrants value. Cash exercises of redeemable convertible preferred stock warrants shares. Cash exercises of redeemable convertible preferred stock warrants value. Temporary equity conversion of redeemable convertible preferred stock warrants to common stock warrants shares. Temporary equity conversion of redeemable convertible preferred stock warrants to common stock warrants value. Conversion of redeemable convertible preferred stock warrants to common stock warrants shares. Conversion of redeemable convertible preferred stock warrants to common stock warrants value. Exercise of warrants for common stock. Gain on extinguishment of redeemable convertible preferred stock. Temporary equity costs to adjust the redemption value on redeemable convertible preferred stock. Statement Of Stockholders Equity [Abstract] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid In Capital [Member] Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income [Member] Accumulated Deficit Retained Earnings [Member] Sale of Stock Subsidiary Sale Of Stock [Axis] Sale of Stock Sale Of Stock Name Of Transaction [Domain] IPO I P O [Member] Beginning Balance Beginning Balance (shares) Shares Outstanding Temporary Equity, Beginning Balance Temporary Equity, Beginning Balance (shares) Temporary Equity, Issuance of Series E redeemable convertible preferred stock, net of issuance costs Temporary Equity Stock Issued During Period Value New Issues Temporary Equity, Issuance of Series E redeemable convertible preferred stock, net of issuance costs (shares) Temporary Equity Stock Issued During Period Shares New Issues Issuance of common stock on settlement of accrued dividend Stock Issued During Period Value Stock Dividend Temporary Equity, Issuance of common stock on settlement of accrued dividend Temporary Equity Settlement Of Accrued Dividends Issuance of common stock on settlement of accrued dividend (shares) Stock Issued During Period Shares Stock Dividend Issuance of common stock upon net exercises of Series B redeemable convertible preferred stock warrants Stock Issued During Period Value Redeemable Convertible Preferred Stock Warrants Issuance of common stock upon net exercises of Serie B redeemable convertible preferred stock warrants (shares) Stock Issued During Period Shares Redeemable Convertible Preferred Stock Warrants Cash exercises of Series C redeemable convertible preferred stock warrants Cash Exercises Of Redeemable Convertible Preferred Stock Warrants Value Temporary Equity, Cash exercises of Series C redeemable convertible preferred stock warrants (shares) Temporary Equity Cash Exercises Of Redeemable Convertible Preferred Stock Warrants Shares Temporary Equity, Cash exercises of Series C redeemable convertible preferred stock warrants Temporary Equity Cash Exercises Of Redeemable Convertible Preferred Stock Warrants Value Conversion of Series A redeemable convertible preferred stock warrants to common stock warrants Conversion Of Redeemable Convertible Preferred Stock Warrants To Common Stock Warrants Value Conversion of redeemable convertible preferred stock to common stock upon initial public offering Stock Issued During Period Value Conversion Of Convertible Securities Conversion of redeemable convertible preferred stock to common stock upon initial public offering (shares) Stock Issued During Period Shares Conversion Of Convertible Securities Issuance of common stock upon initial public offering, net of issuance costs Stock Issued During Period Value New Issues Issuance of common stock upon initial public offering, net of issuance cost (shares) Stock Issued During Period Shares New Issues Reclassification of redeemable convertible preferred stock warrant liability to equity Reclassifications Of Temporary To Permanent Equity Deemed dividend on settlement of accrued dividend Deemed Dividend On Settlement Of Accrued Dividend Temporary Equity, Deemed dividend on settlement of accrued dividend Temporary Equity Deemed Dividend On Settlement Of Accrued Dividend Stock option exercises Stock Issued During Period Value Stock Options Exercised Stock option exercises (shares) Stock Issued During Period Shares Stock Options Exercised Common stock warrant exercises Exercise Of Warrants For Common Stock Exercise of warrants for common stock shares. Common stock warrant exercises (shares) Exercise Of Warrants For Common Stock Shares Stock-based compensation Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Gain on extinguishment of redeemable convertible preferred stock Gain On Extinguishment Of Redeemable Convertible Preferred Stock Temporary Equity, gain on extinguishment of redeemable convertible preferred stock. Temporary Equity, Gain on extinguishment of redeemable convertible preferred stock Temporary Equity Gain On Extinguishment Of Redeemable Convertible Preferred Stock Temporary Equity, Costs to adjust the redemption value on redeemable convertible preferred stock Temporary Equity Costs To Adjust Redemption Value On Redeemable Convertible Preferred Stock Adjustment to redemption value on redeemable convertible preferred stock Adjustments To Additional Paid In Capital Increase In Carrying Amount Of Redeemable Preferred Stock Temporary equity, Adjustment to redemption value on redeemable convertible preferred stock Temporary Equity Adjustment To Redemption Value On Redeemable Convertible Preferred Stock Ending Balance Temporary Equity, Ending Balance (shares) Temporary Equity, Ending Balance Ending Balance (shares) Temporary Equity, Issuance of common stock upon net exercises of Series B redeemable convertible preferred stock warrants (shares) Temporary Equity Stock Issued During Period Shares Redeemable Convertible Preferred Stock Warrants Temporary Equity, Issuance of common stock upon net exercises of Series B redeemable convertible preferred stock warrants Temporary Equity Stock Issued During Period Value Redeemable Convertible Preferred Stock Warrants Cash exercises of Series C redeemable convertible preferred stock warrants (shares) Cash Exercises Of Redeemable Convertible Preferred Stock Warrants Shares Temporary Equity, Conversion of Series A redeemable convertible preferred stock warrants to common stock warrants (shares) Temporary Equity Conversion Of Redeemable Convertible Preferred Stock Warrants To Common Stock Warrants Shares Temporary Equity, Conversion of Series A redeemable convertible preferred stock warrants to common stock warrants Temporary Equity Conversion Of Redeemable Convertible Preferred Stock Warrants To Common Stock Warrants Value Conversion of Series A redeemable convertible preferred stock warrants to common stock warrants (shares) Conversion Of Redeemable Convertible Preferred Stock Warrants To Common Stock Warrants Shares Non-cash lease expense. Non-cash interest expense. Provision for inventories. Increase (decrease) in accrued warranty liability. Increase (decrease) in operating lease liabilities. Proceeds from issuance of cash exercise of redeemable convertible preferred stock warrant. Repayment of term loan and extinguishment costs. Payment of redeemable convertible preferred stock issuance costs. Cash paid for amounts included in the measurement of operating lease liabilities. Statement Of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided By Used In Operating Activities [Abstract] 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] Depreciation and amortization Depreciation And Amortization Non-cash lease expense Non Cash Lease Expense Non-cash interest expense Non Cash Interest Expense Amortization (accretion) of premium (discount) on investments, net Accretion Amortization Of Discounts And Premiums Investments Provision for accounts receivable Provision For Doubtful Accounts Provision for inventories Provision For Inventories Loss on disposal of property and equipment Gain Loss On Sale Of Property Plant Equipment Stock-based compensation Share Based Compensation Change in fair value of redeemable convertible preferred stock warrant liability Loss on extinguishment of term loan Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Accounts receivable Increase Decrease In Accounts Receivable Inventories Increase Decrease In Inventories Prepaid expenses and other assets Increase Decrease In Prepaid Expenses Other Accounts payable Increase Decrease In Accounts Payable Accrued payroll and related benefits Increase Decrease In Employee Related Liabilities Accrued expenses and other current liabilities Increase Decrease In Accrued Liabilities And Other Operating Liabilities Accrued warranty liability Increase Decrease In Accrued Warranty Liability Deferred revenue Increase Decrease In Deferred Revenue Accrued interest Increase Decrease In Interest Payable Net Operating lease liabilities Increase Decrease In Operating Lease Liabilities Net cash used in operating activities Net Cash Provided By Used In Operating Activities Cash flows from investing activities: Net Cash Provided By Used In Investing Activities [Abstract] Purchases of property and equipment Payments To Acquire Property Plant And Equipment Purchases of short-term investments Payments To Acquire Short Term Investments Sales and maturities of short-term investments Proceeds From Sale Of Short Term Investments Net cash provided by (used in) investing activities Net Cash Provided By Used In Investing Activities Cash flows from financing activities: Net Cash Provided By Used In Financing Activities [Abstract] Proceeds from issuance of common stock upon initial public offering, net of issuance costs paid Proceeds From Issuance Initial Public Offering Proceeds from cash exercise of redeemable convertible preferred stock warrants Proceeds From Issuance Of Cash Exercise Of Redeemable Convertible Preferred Stock Warrant Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs Proceeds From Issuance Of Redeemable Convertible Preferred Stock Proceeds from stock option exercises Proceeds From Stock Options Exercised Proceeds from exercise of common stock warrant Proceeds From Warrant Exercises Proceeds from issuance of term loan, net of issuance costs Proceeds From Issuance Of Long Term Debt Repayment of term loan and extinguishment costs Repayment Of Term Loan And Extinguishment Costs Repayment of finance lease Finance Lease Principal Payments Payment of redeemable convertible preferred stock issuance costs Payment Of Redeemable Convertible Preferred Stock Issuance Costs Net cash provided by financing activities Net Cash Provided By Used In Financing Activities 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 Cash, cash equivalents and restricted cash as of beginning of period Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations Cash, cash equivalents and restricted cash as of end of period Supplemental cash flow disclosures: Supplemental Cash Flow Elements [Abstract] Cash paid for income taxes Income Taxes Paid Cash paid for interest Interest Paid Net Cash paid for amounts included in the measurement of operating lease liabilities Cash Paid For Amounts Included In Measurement Of Operating Lease Liabilities Reclassification of redeemable convertible preferred stock warrant liability for conversion of series A warrants into common stock warrants. Reclassification of redeemable convertible preferred stock warrant liability to additional paid-in capital. Conversion of redeemable convertible preferred stock into common stock upon initial public offering. Initial public offering issuance costs included in accrued expenses. Transfer of property and equipment to inventories. Capital expenditures included in accounts payable and accrued expenses. Gain on extinguishment of redeemable convertible preferred stock before cost adjustment. Adjustment to redemption value on redeemable convertible preferred stock. Supplemental non-cash investing and financing activities: Noncash Investing And Financing Items [Abstract] Reclassification of redeemable convertible preferred stock warrant liability for conversion of Series A redeemable preferred stock warrants into common stock warrants Reclassification Of Redeemable Convertible Preferred Stock Warrant Liability For Conversion Of Series A Warrants Into Common Stock Warrants Reclassification of redeemable convertible preferred stock warrant liability to additional paid-in capital Reclassification Of Redeemable Convertible Preferred Stock Warrant Liability To Additional Paid In Capital Conversion of redeemable convertible preferred stock into common stock upon initial public offering Conversion Of Redeemable Convertible Preferred Stock Into Common Stock Upon Initial Public Offering Initial public offering issuance costs included in accrued expenses Initial Public Offering Issuance Costs Included In Accrued Expenses Right-of-use assets obtained in exchange for lease liabilities Right Of Use Asset Obtained In Exchange For Operating Lease Liability Transfer of inventories to property and equipment Transfer Of Property And Equipment To Inventories Issuance of common stock on settlement of accrued dividend Stock Issued1 Capital expenditures included in accounts payable and accrued expenses Capital Expenditures Included In Accounts Payable And Accrued Expenses Gain on extinguishment of redeemable convertible preferred stock Gain On Extinguishment Of Redeemable Convertible Preferred Stock Before Cost Adjustment Adjustment to redemption value on redeemable convertible preferred stock Adjustment To Redemption Value On Redeemable Convertible Preferred Stock Organization Consolidation And Presentation Of Financial Statements [Abstract] Description of Business Business Description And Basis Of Presentation [Text Block] Accounting Policies [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Revenue From Contract With Customer [Abstract] Revenue and Deferred Revenue Revenue From Contract With Customer [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Debt Disclosure [Abstract] Term Loan Debt Disclosure [Text Block] Redeemable convertible preferred stock and stockholders’ equity (deficit). Equity [Abstract] Redeemable Convertible Preferred Stock and Stockholders’ Equity (Deficit) Redeemable Convertible Preferred Stock And Stockholders Equity Deficit [Text Block] Redeemable convertible preferred stock warrants and common stock warrants. Redeemable Convertible Preferred Stock Warrants and Common Stock Warrants Redeemable Convertible Preferred Stock Warrants And Common Stock Warrants Disclosure [Text Block] Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Stock-based Compensation Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Earnings Per Share [Abstract] Net Loss Per Share Attributable to Common Stockholders Earnings Per Share [Text Block] Basis of Presentation Basis Of Accounting Policy Policy [Text Block] Use of Estimates Use Of Estimates Cash, Cash Equivalents and Restricted Cash Cash And Cash Equivalents Restricted Cash And Cash Equivalents Policy Fair Value of Financial Instruments Fair Value Of Financial Instruments Policy Accrued Warranty Liability Standard Product Warranty Policy Contract liabilities deferred revenue. Contract Liabilities - Deferred Revenue Contract Liabilities Deferred Revenue Policy [Text Block] Redeemable Convertible Preferred Stock Warrant Liability Stockholders Equity Note Redeemable Preferred Stock Issue Policy Revenue Revenue From Contract With Customer Policy [Text Block] Stock-Based Compensation Share Based Compensation Option And Incentive Plans Policy Net Loss Per Share Attributable to Common Stockholders Earnings Per Share Policy [Text Block] Recently Adopted Accounting Pronouncements and Recently Issued Accounting Pronouncements Not Yet Adopted New Accounting Pronouncements Policy Policy [Text Block] Schedule of cash, cash equivalents and restricted cash. Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash Schedule Of Cash Cash Equivalents And Restricted Cash Table [Text Block] Summary of Revenue by Source Disaggregation Of Revenue Table [Text Block] Schedule of contract with customer liability. Schedule of Contract Liabilities Schedule Of Contract With Customer Liability Table [Text Block] Summary of Financial Assets and Liabilities Measured at Fair Value On Recurring Basis by Level Within Fair Value Hierarchy Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis Table [Text Block] Schedule of Change in Fair Value of Redeemable Convertible Preferred Stock Warrant Liability Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Text Block] Schedule of Inventories Schedule Of Inventory Current Table [Text Block] Schedule of Other Assets Schedule Of Other Assets Noncurrent [Text Block] Accrued expenses and other current liabilities. Accrued Expenses and Other Current Liabilities Schedule Of Accrued Expenses And Other Current Liabilities Table [Text Block] Accrued Warranty Liability Schedule Of Product Warranty Liability Table [Text Block] Schedule of Term Loan Schedule Of Debt Table [Text Block] Summary of Stock-based Compensation Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Text Block] Schedule of Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Schedule of Outstanding Potentially Dilutive Shares were Excluded from Calculation of Diluted Net Loss Per Share Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Text Block] Description of business. Description of business. Description Of Business [Table] Description Of Business [Table] Underwriters. Underwriters Underwriters [Member] Award Type Award Type [Axis] Award Type Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Stock Option Employee Stock Option [Member] Description Of Business [Line Items] Description Of Business [Line Items] Entity incorporation date Entity Incorporation Date Of Incorporation Entity incorporation state Offering costs, underwriting discounts and commissions expenses. Stock issued during the period Share price Share Price Aggregate net proceeds from IPO Offering costs, underwriting discounts and commissions expenses Offering Costs Underwriting Discounts And Commissions Expenses Cumulative stock-based compensation Allocated Share Based Compensation Expense Reverse stock split, description Stockholders Equity Reverse Stock Split Stock split conversion ratio Stockholders Equity Note Stock Split Conversion Ratio1 Cash cash equivalents, restricted cash and short term investments. Cash, cash equivalents and short-term investments Cash Cash Equivalents And Short Term Investments Cash, cash equivalents, restricted cash and short-term investments Cash Cash Equivalents Restricted Cash And Short Term Investments Summary of significant accounting policies. Summary of significant accounting policies. Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Vesting Vesting [Axis] Vesting Vesting [Domain] First Anniversary Share Based Compensation Award Tranche One [Member] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Total cash, cash equivalents and restricted cash Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Capitalized contract cost amortization period description. Capitalized contract cost amortization period description Capitalized Contract Cost Amortization Period Description Vesting rate Sharebased Compensation Arrangement By Sharebased Payment Award Award Vesting Rights Percentage Service-based options vesting period Share Based Compensation Arrangement By Share Based Payment Award Award Requisite Service Period1 General vesting period Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 Change in accounting principle, accounting standards update, adopted Change In Accounting Principle Accounting Standards Update Adopted Change in accounting principle, accounting standards update, adoption date Change In Accounting Principle Accounting Standards Update Adoption Date Change in accounting principle, accounting standards update, immaterial effect Change In Accounting Principle Accounting Standards Update Immaterial Effect Accounting Standards Update [Extensible List] Accounting Standards Update Extensible List Disaggregation Of Revenue [Table] Disaggregation Of Revenue [Table] Consoles Product Consoles Product [Member] Consumables Product Consumables Product [Member] Disaggregation Of Revenue [Line Items] Disaggregation Of Revenue [Line Items] Remaining performance obligations Revenue Remaining Performance Obligation Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Table] Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Start Date [Axis] Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items] Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 Deferred revenue, current Deferred revenue, noncurrent Total Deferred revenue Contract With Customer Liability Revenue recognized Contract With Customer Liability Revenue Recognized Financial liabilities amortized costs. Financial liabilities accumulated gross unrealized gain before tax. Financial liabilities accumulated gross unrealized loss before tax. Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Measurement Frequency Fair Value By Measurement Frequency [Axis] Measurement Frequency Fair Value Measurement Frequency [Domain] Fair Value, Recurring Fair Value Measurements Recurring [Member] Fair Value Hierarchy and NAV Fair Value By Fair Value Hierarchy Level [Axis] Fair Value Hierarchy and NAV Fair Value Measurements Fair Value Hierarchy [Domain] Level 1 Fair Value Inputs Level1 [Member] Level 2 Fair Value Inputs Level2 [Member] Investment Type Investment Type [Axis] Investments Investment Type Categorization [Member] Cash equivalents Cash Equivalents [Member] Short-term investments Short Term Investments [Member] Asset Class Fair Value By Asset Class [Axis] Asset Class Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation By Asset Class [Domain] Money market funds Money Market Funds [Member] Commercial paper Commercial Paper [Member] U.S. Treasury securities U S Treasury Securities [Member] Corporate debt Corporate Debt Securities [Member] Level 3 Fair Value Inputs Level3 [Member] Asset-backed securities Asset Backed Securities [Member] Liability Class Fair Value By Liability Class [Axis] Fair Value by Liability Class Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation By Liability Class [Domain] Redeemable convertible preferred stock warrant liability. Redeemable convertible preferred stock warrant liability Redeemable Convertible Preferred Stock Warrant Liability [Member] 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] Amortized Costs Available For Sale Debt Securities Amortized Cost Basis Gross Unrealized Holding Gains Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax Gross Unrealized Holding Losses Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax Aggregate Fair Value Available For Sale Securities Debt Securities Amortized Costs Financial Liabilities Amortized Costs Gross Unrealized Holding Gains Financial Liabilities Accumulated Gross Unrealized Gain Before Tax Gross Unrealized Holding Losses Financial Liabilities Accumulated Gross Unrealized Loss Before Tax Aggregate Fair Value Financial Liabilities Fair Value Disclosure Available-for-sale securities in unrealized loss position Debt Securities Available For Sale Unrealized Loss Position Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Table] Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Table] Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] Balance at December 31, 2019 Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value Change in fair value Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Period Increase Decrease Conversion of Series A redeemable convertible preferred stock warrants to common stock warrants upon the closing of the IPO Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements Reclassified to additional paid-in capital Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Issues Balance at September 30, 2020 Inventory Disclosure [Abstract] Raw materials Inventory Raw Materials Work in process Inventory Work In Process Finished goods Inventory Finished Goods Total inventories Prepaid insurance noncurrent. Other Assets Noncurrent Disclosure [Abstract] Prepaid insurance, noncurrent Prepaid Insurance Noncurrent Deposits Deposits Assets Noncurrent Total other assets Accrued inventory current. Accrued research and development expenses. Payables And Accruals [Abstract] Accrued inventory Accrued Inventory Current Accrued research and development expenses Accrued Research And Development Expenses Accrued professional services Accrued Professional Fees Current Others Other Liabilities Current Total accrued expenses and other current liabilities Product Warranties Disclosures [Abstract] Balance at the beginning of the period Additions charge to cost of product revenue Product Warranty Accrual Warranties Issued Consumption Product Warranty Accrual Payments Balance at the end of the period Principal of term loan Debt Instrument Face Amount Unamortized debt discount Debt Instrument Unamortized Discount Total term loan Long Term Debt Less: term loan, current Debt Instrument [Table] Debt Instrument [Table] Debt Instrument Debt Instrument [Axis] Debt Instrument, Name Debt Instrument Name [Domain] Perceptive term loan. Perceptive Term Loan Perceptive Term Loan [Member] Silicon valley bank term loan. SVB Term Loan Silicon Valley Bank Term Loan [Member] Variable Rate Variable Rate [Axis] Variable Rate Variable Rate [Domain] Prime Rate Prime Rate [Member] Statistical Measurement Range [Axis] Statistical Measurement Range [Member] Minimum Minimum [Member] Maximum Maximum [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Credit facility, maximum borrowing capacity Line Of Credit Facility Maximum Borrowing Capacity Loan maturity date Debt Instrument Maturity Date Debt interest rate Debt Instrument Interest Rate Effective Percentage Description of variable rate basis Debt Instrument Description Of Variable Rate Basis Basis spread on variable rate Debt Instrument Basis Spread On Variable Rate1 Payment for debt prepayment accrued interest and exit fees. Early prepayment, accrued interest and exit fees Payment For Debt Prepayment Accrued Interest And Exit Fees Debt instrument interest only payments year and month. Debt instrument principal payment term after interest only period expires. Description of payment terms Debt Instrument Payment Terms Debt instrument interest only payments end date Debt Instrument Interest Only Payments Year And Month Debt instrument principal repayment period Debt Instrument Principal Payment Term After Interest Only Period Expires Outstanding principal balance Debt instrument final payment fee percentage. Debt instrument prepayment fee percentage. Debt instrument, final payment fee percentage Debt Instrument Final Payment Fee Percentage Debt instrument, final payment amount Debt Instrument Periodic Payment Terms Balloon Payment To Be Paid Debt instrument prepayment fee percentage Debt Instrument Prepayment Fee Percentage Percentage of limitation on pledges of capital stock of foreign subsidiaries. Percentage of limitation on pledges of capital stock of foreign subsidiaries Percentage Of Limitation On Pledges Of Capital Stock Of Foreign Subsidiaries Other debt issuance costs. Other debt issuance costs Other Debt Issuance Costs Unamortized debt discount Stock issued during period shares issued on exercise of warrants. Schedule Of Stock By Class [Table] Schedule Of Stock By Class [Table] Class of Warrant or Right Class Of Warrant Or Right [Axis] Class of Warrant or Right Class Of Warrant Or Right [Domain] Class Of Stock [Line Items] Class Of Stock [Line Items] Redeemable convertible preferred stock converted to common stock Convertible Preferred Stock Shares Issued Upon Conversion Common stock issued on exercise of outstanding redeemable convertible preferred stock warrants Stock Issued During Period Shares Issued On Exercise Of Warrants Common stock warrants expiration date. Conversion of redeemable convertible preferred stock warrants to common stock. Series A redeemable convertible preferred stock warrants. Series A Redeemable Convertible Preferred Stock Warrants Series A Redeemable Convertible Preferred Stock Warrants [Member] Series B redeemable convertible preferred stock warrants. Series B Redeemable Convertible Preferred Stock Warrants Series B Redeemable Convertible Preferred Stock Warrants [Member] Series C redeemable convertible preferred stock warrants. Series C Redeemable Convertible Preferred Stock Warrants Series C Redeemable Convertible Preferred Stock Warrants [Member] Number of redeemable convertible preferred stock warrants converted Number of redeemable convertible preferred stock warrants converted Conversion Of Redeemable Convertible Preferred Stock Warrants To Common Stock Common stock warrants / Common stock issued upon conversion Warrants exercise price Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1 Common stock warrants expiration date Common Stock Warrants Expiration Date Preferred stock warrants outstanding. Aggregate cash proceed of redeemable convertible preferred stock warrant Preferred stock warrants outstanding Preferred Stock Warrants Outstanding Share Based Arrangements To Obtain Goods And Services [Abstract] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Plan Name Plan Name [Axis] Plan Name Plan Name [Domain] Two thousand twenty equity incentive plan. 2020 Equity Incentive Plan Two Thousand Twenty Equity Incentive Plan [Member] Employees share purchase plan. Employees Share Purchase Plan (ESPP) Employees Share Purchase Plan [Member] Title of Individual Title Of Individual [Axis] Title of Individual Title Of Individual With Relationship To Entity [Domain] Employees and executive officers. Employees and Executive Officers Employees And Executive Officers [Member] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Common stock shares reserved for issuance Common Stock Capital Shares Reserved For Future Issuance Percentage of maximum number on common stock shares outstanding, additional shares available for issuance Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Outstanding Stock Maximum Shares awards granted Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant Contractual term Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period Percentage of fair market value of common stock Sharebased Compensation Arrangement By Sharebased Payment Award Purchase Price Of Common Stock Percent Share based compensation arrangement by share based payment award maximum number of additional shares available for issuance. Maximum number of additional shares available for issuance Share Based Compensation Arrangement By Share Based Payment Award Maximum Number Of Additional Shares Available For Issuance Share-based compensation arrangement by share-based payment award, offering period. Share-based compensation arrangement by share-based payment award, initial offering date. Eligible compensation percentage to purchase common stock Share Based Compensation Arrangement By Share Based Payment Award Maximum Employee Subscription Rate ESPP offering period Share Based Compensation Arrangement By Share Based Payment Award Offering Period ESPP initial offering date Share Based Compensation Arrangement By Share Based Payment Award Initial Offering Date ESPP expiration date Share Based Compensation Arrangement By Share Based Payment Award Expiration Date Income Statement Location Income Statement Location [Axis] Income Statement Location Income Statement Location [Domain] Cost of Revenue Cost Of Sales [Member] Research and Development Research And Development Expense [Member] Sales and Marketing Selling And Marketing Expense [Member] General and Administrative General And Administrative Expense [Member] Share based compensation arrangement by share based payment award, options grant date fair value. Stock options outstanding Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number Stock options, description Share Based Compensation Arrangement By Share Based Payment Award Description Stock options, new grant date fair value Share Based Compensation Arrangement By Share Based Payment Award Options Grant Date Fair Value Stock-based compensation expense Outstanding stock options were fully vested Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number Unamortized deferred stock compensation amount Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options Estimated weighted average period over which unamortized share-based compensation are expected to be recognize Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 Numerator: Net Income Loss [Abstract] Adjustment to redemption value on redeemable convertible preferred stock Temporary Equity Accretion To Redemption Value Adjustment Deemed dividend on settlement of accrued dividend Gain on extinguishment of redeemable convertible preferred stock Net loss attributable to common stockholders, basic and diluted Denominator: Earnings Per Share Basic And Diluted Other Disclosures [Abstract] Weighted-average shares of common stock, basic and diluted Net loss per share attributable to common stockholders, basic and diluted Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Shares Committed under ESPP Employee Stock [Member] Antidilutive Securities Antidilutive Securities Excluded From Computation Of Earnings Per Share By Antidilutive Securities [Axis] Antidilutive Securities, Name Antidilutive Securities Name [Domain] Options to purchase common stock. Options to Purchase Common Stock Options To Purchase Common Stock [Member] Warrants to purchase redeemable convertible preferred stock. Warrants to Purchase Redeemable Convertible Preferred Stock Warrants To Purchase Redeemable Convertible Preferred Stock [Member] Warrants to purchase common stock. Warrant to Purchase Common Stock Warrants To Purchase Common Stock [Member] Redeemable Convertible Preferred Stock, on an as-if Converted Basis Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Anti-dilutive shares excluded from calculation of diluted net loss per share Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount