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Issuance of common stock for Employee Stock Purchase Plan Stock Issued During Period, Value, Employee Stock Purchase Plan Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Gross Unrealized Gain Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Entity Current Reporting Status Entity Current Reporting Status Other current liabilities Other Liabilities, Current Other long-term assets Other Assets, Noncurrent Employee-related liabilities Increase (Decrease) in Employee Related Liabilities Depreciation and amortization expense Depreciation, Depletion and Amortization Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Lease term Lessee, Operating Lease, Term of Contract Issuance of common stock for Employee Stock Purchase Plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Schedule of Interest Expense Recognized Interest Income and Interest Expense Disclosure [Table Text Block] Offering period Offering Period Offering period. 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Investments, Debt and Equity Securities [Abstract] Shares authorized for future equity award grants Authorized For Future Option Grants [Member] Authorized for future option grants. 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Insulin Pump Insulin Pump [Member] Insulin pump. Maximum term of stock options (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Corporate debt securities Corporate debt securities Corporate Debt Securities [Member] Commitment fee percentage Line of Credit Facility, Commitment Fee Percentage Cumulative Effect, Period of Adoption, Adjustment Cumulative Effect, Period of Adoption, Adjustment [Member] Revenue from Contract with Customer Benchmark Revenue from Contract with Customer Benchmark [Member] Schedule of Future Minimum Payments Under Non-cancellable Operating Leases Lessee, Operating Lease, Liability, Maturity [Table Text Block] Entity Address, Address Line One Entity Address, Address Line One Other financing activities Proceeds from (Payments for) Other Financing Activities Total stock-based compensation expense capitalized as part of cost of inventory Share-Based Payment Arrangement, Amount Capitalized Product and Service [Axis] Product and Service Product and Service [Axis] High Bluff Drive Lease High Bluff Drive Lease [Member] High Bluff Drive Lease Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Credit Facility [Axis] Credit Facility [Axis] Equity [Abstract] Equity [Abstract] Debt Conversion Description [Axis] Debt Conversion Description [Axis] Entity Tax Identification Number Entity Tax Identification Number Monthly base rent Lessee, Operating Lease, Monthly Base Rent Lessee, Operating Lease, Monthly Base Rent Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Debt Conversion, Name [Domain] Debt Conversion, Name [Domain] Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward] Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward] 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] Net increase in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Investment owned at cost Investment Owned, at Cost Commercial paper Commercial paper Commercial Paper [Member] Entity Central Index Key Entity Central Index Key Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Measurement Frequency [Axis] Measurement Frequency [Axis] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [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] Measurement Input Type [Axis] Measurement Input Type [Axis] Accounting Standards Update [Domain] Accounting Standards Update [Domain] City Area Code City Area Code Assets Assets [Abstract] Retirement Benefits [Abstract] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock [Axis] Revenue, Major Customer [Line Items] Revenue, Major Customer [Line Items] Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Common Stock Warrant Expiring Between July 2022 and August 2022 Common Stock Warrant Expiring Between July 2022 and August 2022 [Member] Common Stock Warrant Expiring Between July 2022 and August 2022 Net Income (Loss) Per Share Earnings Per Share, Policy [Policy Text Block] Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Weighted average grant date fair value - options (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Variable Rate [Axis] Variable Rate [Axis] Outstanding warrants (in shares) Class of Warrant or Right, Outstanding Other long-term liabilities Other Liabilities, Noncurrent Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Research and development Research and Development Expense [Member] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Operating lease right-of-use assets obtained in exchange for operating lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Cost of sales Cost of Sales [Member] Schedule of Convertible Notes Convertible Debt [Table Text Block] Schedule of Shares of Common Stock Reserved for Future Issuance Schedule Of Common Stock Reserved For Future Issuance [Table Text Block] Schedule of common stock reserved for future issuance. Decrease in warranty estimates Standard and Extended Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties Accounting Standards Update [Extensible List] Accounting Standards Update [Extensible Enumeration]