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Significant Accounting Policies [Text Block] Accrued expenses Accrued Liabilities, Current Entity Interactive Data Current Entity Interactive Data Current Change in unrealized loss on marketable securities Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax Common stock, shares issued (in shares) Common Stock, Shares, Issued Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Class A and Class B Common Stock Common Class A And Common Class B [Member] Common Class A And Common Class B Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Inventories, net Total inventories, net Inventory, Net Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Measurement Frequency [Axis] Measurement Frequency [Axis] Stock converted (in shares) Conversion of Stock, Shares Converted Loss Per Share Earnings Per Share [Text Block] Covenant, minimum level of liquidity required Debt Instrument, Covenant, Liquidity Required, Minimum Debt Instrument, Covenant, Liquidity Required, Minimum Award Type [Domain] Award Type [Domain] Other assets Increase (Decrease) in Other Operating Assets Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Revolving Credit Facility Revolving Credit Facility [Member] Granted, weighted-average exercise price (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Issuance of common stock under employee stock purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Initial public offering, net of issuance costs (in shares) Stock Issued During Period, Shares, New Issues Vesting percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Cost of revenue Cost of Sales [Member] Restricted Stock Units Restricted Stock Units (RSUs) [Member] Research and development Research and Development Expense [Member] Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-sale [Table] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] 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] Total liabilities Liabilities Acquisition of Tonic Fitness Technology Business Combination Disclosure [Text Block] Common stock, $0.000025 par value; 2,500,000,000 and zero Class A shares authorized, 175,029,321 and zero shares issued and outstanding as of March 31, 2020 and June 30, 2019, respectively; 2,500,000,000 and 400,000,000 Class B shares authorized, 107,144,281 and 25,301,604 shares issued and outstanding as of March 31, 2020 and June 30, 2019, respectively. Common Stock, Value, Issued Maturities of marketable securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Sales and marketing Selling and Marketing Expense [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Research and development Research and development Research and Development Expense Exercise price of common stock, percentage of fair market value Share-based Compensation Arrangement by Share-based Payment Award, Exercise Price To Fair Market Value, Percent Share-based Compensation Arrangement by Share-based Payment Award, Exercise Price To Fair Market Value, Percent Vesting [Domain] Vesting [Domain] Number of Stock Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward] Inventories Increase (Decrease) in Inventories Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Right-of-use asset Operating Lease, Right-of-Use Asset Percentage of common class B shares outstanding to total common shares outstanding (at least) Common Stock, Terms Of Conversion, Percentage Of Outstanding Shares, Minimum Common Stock, Terms Of Conversion, Percentage Of Outstanding Shares, Minimum Equity Components [Axis] Equity Components [Axis] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Acquisition related costs Business Combination, Acquisition Related Costs Total stockholders’ equity (deficit) Beginning balance Ending balance Stockholders' Equity Attributable to Parent Other liabilities Increase (Decrease) in Other Operating Liabilities Deferred rent Deferred Rent Credit, Noncurrent 2015 Stock Plan Two-Thousand Fifteen Stock Plan [Member] Two-Thousand Fifteen Stock Plan Customer deposits and deferred revenue Contract with Customer, Liability, Current Raw materials Inventory, Raw Materials and Supplies, Gross Fair Value Measurements Fair Value Disclosures [Text Block] Schedule of Supplemental Cash Flow and Other Information Related to Leases Lease, Cost [Table Text Block] Depreciation and amortization expense Depreciation, Depletion and Amortization Conversion of redeemable convertible preferred stock to common stock Stock Issued During Period, Value, Conversion of Convertible Securities Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Redeemable convertible preferred stock, shares outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Temporary Equity, Shares Outstanding Variable Rate [Axis] Variable Rate [Axis] Security Exchange Name Security Exchange Name Other assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Shares excluded from calculation of diluted shares outstanding (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Litigation Case [Axis] Litigation Case [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Marketable securities Debt Securities, Available-for-sale, Current Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities Equity Component [Domain] Equity Component [Domain] Weighted average expected term Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Customer deposits and deferred revenue Increase (Decrease) in Contract with Customer, Liability Document Transition Report Document Transition Report Employee Stock Options Employee stock options Share-based Payment Arrangement, Option [Member] Current liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Less: Reserves Inventory Valuation Reserves Line of Credit Line of Credit [Member] Employee Stock Employee Stock [Member] Income Statement [Abstract] Series F Tender Offer Series F Tender Offer [Member] Series F Tender Offer