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Money back guarantee period Money Back Guarantee Period Money back guarantee period. Adjustments to reconcile net income to net cash provided by operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Research and development Research and Development Expense Other expense, net Other Nonoperating Income (Expense) Total liabilities Liabilities March 2016 Revolving Loan March 2016 Revolving Loan [Member] March 2016 Revolving Loan [Member] Lessee, Operating Lease, Liability, Undiscounted Excess Amount Lessee, Operating Lease, Liability, Undiscounted Excess Amount SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION Supplemental Cash Flow Information [Abstract] Common stock issued under employee stock purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Trading Symbol Trading Symbol United States UNITED STATES Basic (USD per share) Net income per share, basic (USD per share) Earnings Per Share, Basic Basic (in shares) Basic weighted-average common shares outstanding 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TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Entity Address, State or Province Entity Address, State or Province 2021 Operating Leases, Future Minimum Payments, Due in Two Years Accounts receivable Accounts Receivable, after Allowance for Credit Loss, Current Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Class of Stock [Line Items] Class of Stock [Line Items] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Equity Components [Axis] Equity Components [Axis] Shares issued Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Components of inventory Schedule of Inventory, Current [Table Text 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Commission and incentive expenses include sales commissions paid to our independent distributors, special incentives, costs for incentive trip and other rewards Effect of New Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Other long-term assets Increase (Decrease) in Other Noncurrent Assets Diluted (in shares) Diluted weighted-average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Document Transition Report Document Transition Report Commitments and Contingencies Contingencies Disclosure [Text Block] Organization and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Convertible notes receivable, aggregate amount Notes Receivable, Related Party, Maximum Commitment Notes Receivable, Related Party, Maximum Commitment Schedule of supplemental cash flow related to operating leases Lease, Cost [Table Text Block] Common stock, shares issued (in shares) Common Stock, Shares, Issued Shares purchased as payment of tax withholding Payment, Tax Withholding, Share-based Payment Arrangement Right-of-use assets Operating Lease, Right-of-Use Asset Right to purchase common stock, maximum price per share (USD per share) Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit Total operating expenses Operating Expenses Preferred stock, par value (USD per share) Preferred Stock, Par or Stated Value Per Share Japan JAPAN Cash and cash equivalents Cash and Cash Equivalents — beginning of period Cash and Cash Equivalents — end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Inventory valuation reserves Inventory Valuation Reserves Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Current portion of long-term debt, net Long-term Debt, Current Maturities Debt instrument, covenant, total liabilities to tangible net worth ratio Debt Instrument, Covenant, Total Liabilities To Tangible Net Worth Ratio Debt Instrument, Covenant, Total Liabilities To Tangible Net Worth Ratio Stock based compensation reflected in additional paid in capital APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition Accounts Receivable Receivable [Policy Text Block] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Notes receivable Notes Receivable, Related Parties, Current Cash accounts held primarily at One Financial Institution Cash Accounts Held Primarily At Financial Institution [Member] Cash Accounts Held Primarily At Financial Institution [Member] Cash paid for income taxes Income Taxes Paid Preferred stock — par value $0.0001 per share, 5,000 shares authorized, no shares issued or outstanding Preferred Stock, Value, Issued Stock-based compensation Share-based Payment Arrangement, Noncash Expense Contractual term of stock options granted Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Investments in convertible note receivable Origination of Notes Receivable from Related Parties Other comprehensive loss, net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Concentration Risk [Table] Concentration Risk [Table] Net income Net income Net Income (Loss) Attributable to Parent Operating cash flows from operating leases Operating Lease, Payments Concentration of credit risk Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure Income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Geographical [Axis] Geographical [Axis] Number of geographic segments Number Of Geographic Segments Number of geographic segments. Operating lease expense Operating Lease, Expense Accounts receivable Increase (Decrease) in Accounts Receivable Entity Small Business Entity Small Business Number of additional shares authorized (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Effect of dilutive securities: Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] Entity File Number Entity File Number Leases Lessee, Leases [Policy Text Block] Amortization of debt discount Amortization of Debt Discount (Premium) Entity Address, City or Town Entity Address, City or Town Lease liabilities Operating Lease, Liability, Current Derivative Instruments and Hedging Activities Derivatives, Policy [Policy Text Block] Entity Filer Category Entity Filer Category Operating Leases, Future Minimum Payments Due, Total Operating Leases, Future Minimum Payments Due Equity [Abstract] Equity [Abstract] Beginning Balance (in shares) Ending Balance (in 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[Member] Share based payment award, vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Lease liabilities Increase (Decrease) in Operating Liabilities Depreciation and amortization Depreciation, Depletion and Amortization Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Statement Statement [Line Items] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Entity Registrant Name Entity Registrant Name 2017 Long-Term Incentive Plan Excluding 2010 Long-Term Incentive Plan Two Thousand Seventeen Long Term Incentive Plan, Excluding Two Thousand And Ten Long Term Incentive Plan [Member] Two Thousand Seventeen Long Term Incentive Plan, Excluding Two Thousand And Ten Long Term Incentive Plan [Member] Total other expense Nonoperating Income (Expense) Stock repurchase program authorized amount Stock Repurchase Program, Authorized Amount Current liabilities Liabilities, Current [Abstract] Foreign currency transaction gain (loss), realized Foreign Currency Transaction Gain (Loss), Realized Common stock issued under employee stock purchase plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Amendment Flag Amendment Flag Selling, general and administrative Selling, General and Administrative Expense Exercise of options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Proceeds from common stock issued under employee stock purchase plan Proceeds From Issuance Of Common Stock Under Employee Stock Purchase Plan Proceeds From Issuance Of Common Stock Under Employee Stock Purchase Plan LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] City Area Code City Area Code Revenue, net Revenue from Contract with Customer, Excluding Assessed Tax Credit Facility [Domain] Credit 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Common stock, shares authorized (in shares) Common Stock, Shares Authorized Net income per share: Earnings Per Share [Abstract] Number of shares authorized (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Leases [Abstract] Minimum Minimum [Member] Security Exchange Name Security Exchange Name Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Remaining authorized repurchase amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Debt instrument, covenant, required minimum working capital Debt Instrument, Covenant, Required Minimum Working Capital Debt Instrument, Covenant, Required Minimum Working Capital Entity Address, Address Line Two Entity Address, Address Line Two Entity Address, Address Line One Entity Address, Address Line One 2007 Long-Term Incentive Plan Two Thousand And Seven Long Term Incentive Plan [Member] Two thousand and seven long term incentive plan. Cash held primarily at Other Financial Institutions Cash Accounts Held at Other Financial Institutions [Member] Cash Accounts Held At Other Financial Institutions [Member] Current assets Assets, Current [Abstract] Credit Facility [Axis] Credit Facility [Axis] Entity Shell Company Entity Shell Company Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Exercise of options Stock Issued During Period, Value, Stock Options Exercised Stock-Based Compensation Share-based Payment Arrangement [Policy Text Block] Other long-term liabilities Other Liabilities, Noncurrent Related Party Transactions Related Party Transactions Disclosure [Text Block] Exercise of options Proceeds from Stock Options Exercised Gross profit Gross Profit Total stockholders’ equity Beginning Balance Ending Balance Stockholders' Equity Attributable to Parent Class of Stock [Domain] Class of Stock [Domain] 2021 Lessee, Operating Lease, Liability, Payments, Due Year Two Plan Name [Axis] Plan Name [Axis] Repurchase of company stock (in shares) Stock repurchase program shares repurchased (in shares) Stock Repurchased During Period, Shares Equity Component [Domain] Equity Component [Domain] Maximum Maximum [Member] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Title of 12(b) Security Title of 12(b) Security