Entity Central Index Key Trading securities gross unrealized gain accumulated in investments. Trading securities gross unrealized loss accumulated in investments. Short term investments accumulated gross unrealized gain before tax. Short term investments accumulated gross unrealized loss before tax. Document and entity information. Document And Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Statement Of Financial Position [Abstract] Statement [Table] Statement [Table] Finite-Lived Intangible Assets by Major Class Finite Lived Intangible Assets By Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name Finite Lived Intangible Assets Major Class Name [Domain] Patents [Member] Patents [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 Restricted cash Restricted Cash And Cash Equivalents Short-term investments Short Term Investments Accounts receivable, net Accounts Receivable Net Current Inventory Inventory Net Prepaid and other current assets Prepaid Expense And Other Assets Current Total current assets Assets Current Property and equipment, net Property Plant And Equipment Net Patents, net Finite Lived Intangible Assets Net Other long-term assets Other Assets Noncurrent Total assets Assets Liabilities and stockholders’ equity Liabilities And Stockholders Equity [Abstract] Current liabilities: Liabilities Current [Abstract] Accounts payable Accounts Payable Current Accrued expense Accrued Liabilities Current Employee-related liabilities Employee Related Liabilities Current Deferred revenue Deferred Revenue Current Other current liabilities Other Liabilities Current Total current liabilities Liabilities Current Notes payable—long-term Long Term Notes Payable Deferred rent—long-term Deferred Rent Credit Noncurrent Other long-term liabilities Other Liabilities Noncurrent Total liabilities Liabilities Commitments and contingencies Commitments And Contingencies Stockholders’ equity: Stockholders Equity [Abstract] Common stock, $0.001 par value; 100,000 shares authorized as of March 31, 2016 and December 31, 2015, 30,348 and 30,255 shares issued and outstanding at March 31, 2016 and December 31, 2015, 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 Stockholders Equity Total liabilities and stockholders’ equity Liabilities And Stockholders Equity 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 Income Statement [Abstract] Sales Sales Revenue Net Cost of sales Cost Of Goods And Services Sold Gross profit Gross Profit Operating expenses: Operating Expenses [Abstract] Selling, general and administrative Selling General And Administrative Expense Research and development Research And Development Expense Total operating expenses Operating Expenses Operating loss Operating Income Loss Other income (expense), net: Other Nonoperating Income Expense [Abstract] Interest and other income Interest And Other Income Interest and other expense Interest Expense Other Total other expense, net Other Nonoperating Income Expense Net loss Net Income Loss Other comprehensive loss: Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Unrealized gain on short-term investments Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax Comprehensive loss Comprehensive Income Net Of Tax Net loss per share, basic and diluted Earnings Per Share Basic And Diluted Weighted average shares used to compute basic and diluted net loss per share Weighted Average Number Of Share Outstanding Basic And Diluted Provision for recovery of doubtful accounts. Increase decrease in deferred rent. Cash proceeds received by the Company, net of offering costs, for the initial or subsequent offering of common stock to the public. Statement Of Cash Flows [Abstract] Operating activities Net Cash Provided By Used In Operating Activities Continuing Operations [Abstract] Net loss 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 expense Depreciation Depletion And Amortization Interest expense related to amortization of debt discount and debt issuance costs Amortization Of Financing Costs And Discounts Provision for allowance for doubtful accounts Provision For Recovery Of Doubtful Accounts Payment in kind interest accrual of notes payable Paid In Kind Interest Amortization of premium (discount) on short-term investments Investment Income Net Amortization Of Discount And Premium Stock-based compensation expense Share Based Compensation Other Other Operating Activities Cash Flow Statement Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Accounts receivable, net Increase Decrease In Accounts Receivable Inventory Increase Decrease In Inventories Prepaid and other current assets Increase Decrease In Prepaid Deferred Expense And Other Assets Other long-term assets Increase Decrease In Other Noncurrent Assets Accounts payable Increase Decrease In Accounts Payable Accrued expense Increase Decrease In Accrued Liabilities Employee-related liabilities Increase Decrease In Employee Related Liabilities Deferred revenue Increase Decrease In Deferred Revenue Other current liabilities Increase Decrease In Other Current Liabilities Deferred rent Increase Decrease In Deferred Rent Other long-term liabilities Increase Decrease In Other Noncurrent Liabilities Net cash used in operating activities Net Cash Provided By Used In Operating Activities Continuing Operations Investing activities Net Cash Provided By Used In Investing Activities Continuing Operations [Abstract] Purchase of short-term investments Payments To Acquire Short Term Investments Proceeds from sales and maturities of short-term investments Proceeds From Sale Of Short Term Investments Purchase of property and equipment Payments To Acquire Property Plant And Equipment Purchase of patents Payments To Acquire Intangible Assets Net cash used in investing activities Net Cash Provided By Used In Investing Activities Continuing Operations Financing activities Net Cash Provided By Used In Financing Activities Continuing Operations [Abstract] Issuance of notes payable, net of issuance costs Proceeds From Notes Payable Proceeds from public offering, net of offering costs Proceeds From Public Offering Net Of Offering Costs Proceeds from issuance of common stock Proceeds From Issuance Of Common Stock Net cash provided by financing activities Net Cash Provided By Used In Financing Activities Continuing Operations Net (decrease) increase in cash and cash equivalents Cash And Cash Equivalents Period Increase Decrease Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Supplemental disclosures of cash flow information Supplemental Cash Flow Information [Abstract] Interest paid Interest Paid Supplemental schedule of noncash investing and financing activities Noncash Investing And Financing Items [Abstract] Debt issuance cost included in other long-term liabilities Debt Issuance Costs Incurred During Noncash Or Partial Noncash Transaction Property and equipment included in accounts payable Capital Expenditures Incurred But Not Yet Paid Accounting Policies [Abstract] Organization and Basis of Presentation Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Investments Debt And Equity Securities [Abstract] Short-Term Investments Investments In Debt And Marketable Equity Securities And Certain Trading Assets Disclosure [Text Block] Inventory Disclosure [Abstract] Inventory Inventory Disclosure [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Debt Disclosure [Abstract] Term Loan Agreement with Capital Royalty Partners Debt Disclosure [Text Block] Equity [Abstract] Stockholders' Equity Stockholders Equity Note Disclosure [Text Block] Organization Consolidation And Presentation Of Financial Statements [Abstract] Collaborations Collaborative Arrangement Disclosure [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Nature of operation. The Company Nature Of Operation Policy [Text Block] Basis of Presentation Basis Of Accounting Policy Policy [Text Block] Use of Estimates Use Of Estimates Restricted Cash Cash And Cash Equivalents Restricted Cash And Cash Equivalents Policy Accounts Receivable Receivables Policy [Text Block] Fair Value of Financial Instruments Fair Value Of Financial Instruments Policy Revenue Recognition Revenue Recognition Policy [Text Block] Warranty Reserve Standard Product Warranty Policy Stock-Based Compensation Compensation Related Costs Policy [Text Block] Net Loss Per Share Earnings Per Share Policy [Text Block] Reclassifications. Reclassifications Reclassifications Policy [Text Block] Recent Accounting Pronouncements New Accounting Pronouncements Policy Policy [Text Block] Summary of Reconciliation of Change in Product Warranty Liabilities Schedule Of Product Warranty Liability Table [Text Block] Schedule of Anti-Dilutive Securities Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Text Block] Summary of Estimated Fair Value of Short-Term Investments Schedule Of Cash Cash Equivalents And Short Term Investments Table [Text Block] Summary of Inventory Schedule Of Inventory Current Table [Text Block] Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis Table [Text Block] Schedule of common stock reserved for future issuance. Schedule of Shares of Common Stock Reserved for Future Issuance Schedule Of Common Stock Reserved For Future Issuance Table [Text Block] Schedule of Assumptions Used in Black-Scholes Option-Pricing Model Schedule Of Share Based Payment Award Stock Options Valuation Assumptions Table [Text Block] Summary for Allocation of Stock-Based Compensation Expense Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Text Block] Number of products. Number of products sold Number Of Products Summary of significant accounting policies. Summary of significant accounting policies. Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Long-term Debt, Type Longterm Debt Type [Axis] Long-term Debt, Type Longterm Debt Type [Domain] Original term loan agreement. Original Term Loan Agreement [Member] Original Term Loan Agreement [Member] Products and Services Product Or Service [Axis] Products and Services Products And Services [Domain] Connect hosting service. Connect Hosting Service [Member] Connect Hosting Service [Member] Tandem pump. Tandem Pump [Member] Tandem Pump [Member] Slim cartridges and infusion sets. Slim cartridges and infusion sets [Member] Slim Cartridges And Infusion Sets [Member] Valuation Allowances and Reserves Type Valuation Allowances And Reserves Type [Axis] Valuation Allowances and Reserves Valuation Allowances And Reserves [Domain] Warranty reserves [Member] Warranty Reserves [Member] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Receivables considered as uncollectible, maximum past due days Threshold Period Past Due For Writeoff Of Trade Accounts Receivable Revenue recognition period. Deferred revenue Deferred Revenue Revenue recognition hosting period Revenue Recognition Period Offered period for sales return prior to expiration. Allowance for sales returns. Offered period for sales return Offered Period For Sales Return Prior To Expiration Allowance for product returns Allowance For Sales Returns Products warranty period. Warranty period offered Products Warranty Period Warranty reserve Product Warranty Accrual Product Warranties Disclosures [Abstract] Movement In Standard And Extended Product Warranty Increase Decrease Roll Forward Movement In Standard And Extended Product Warranty Increase Decrease Roll Forward Beginning balance Provision for warranties issued during the period Product Warranty Accrual Warranties Issued Settlements made during the period Product Warranty Accrual Payments Increases in warranty estimates Product Warranty Accrual Preexisting Increase Decrease Ending balance Current portion Product Warranty Accrual Classified Current Non-current portion Product Warranty Accrual Noncurrent Earnings Per Share [Abstract] Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Sale of Stock Subsidiary Sale Of Stock [Axis] Sale of Stock Sale Of Stock Name Of Transaction [Domain] Employee stock purchase plan [Member] 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] Warrants for common stock [Member] Warrant [Member] Common stock options [Member] Employee Stock Option [Member] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive securities excluded from computation of earnings per share, amount Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Debt issuance cost Debt Issuance Costs