Equity Components [Axis] Common Stock [Member] Treasury Stock [Member] Additional Paid-In Capital [Member] Accumulated Deficit [Member] Common Stock Additional Paid-In Capital Treasury Stock Accumulated Deficit Deferred Revenue Arrangement Type [Axis] Service Contracts [Member] Deposits on Products [Member] Investment Type [Axis] Short Term [Member] Financial Instrument [Axis] Corporate Bonds [Member] United States Treasury Bonds [Member] Antidilutive Securities [Axis] Warrant [Member] Stock options [Member] Unvested Shares [Member] Property, Plant and Equipment, Type [Axis] Tradeshow and Demo Equipment [Member] Computer Equipment [Member] Operations and Rental Equipment [Member] Common Unit Warrants [Member] Geographical [Axis] UNITED STATES Customer [Axis] Customer [Member] Concentration Risk Benchmark [Axis] Revenue [Member] Accounts Receivable [Member] Plan Name [Axis] 2016 Equity Incentive Plan [Member] Award Type [Axis] Unvested Restricted Stock [Member] Sale of Stock [Axis] IPO [Member] Related Party [Axis] Investor [Member] Legal Entity [Axis] Placement Agent [Member] 2017 Equity Incentive Plan [Member] Underwriter's Representatives [Member] Range [Axis] Minimum [Member] Maximum [Member] Document And Entity Information Entity Registrant Name Entity Central Index Key Document Type Trading Symbol Document Period End Date Amendment Flag Current Fiscal Year End Date Entity a Well-known Seasoned Issuer Entity a Voluntary Filer Entity's Reporting Status Current Entity Filer Category Entity Public Float Entity Common Stock, Shares Outstanding Document Fiscal Period Focus Document Fiscal Year Focus Statement of Financial Position [Abstract] Assets Current Assets Cash and cash equivalents Accounts receivable, net Inventories Investment in debt securities Prepaid and other current assets Total Current Assets Property and Equipment, Net Patent Rights, Net Deposits Total Assets Liabilities and Stockholders' Equity Current Liabilities Accounts payable and accrued expenses Product warranties Deferred revenue, current portion Total Current Liabilities Revolving credit facility Deferred Revenue, Net of Current Portion Total Liabilities Commitments and Contingencies Stockholders' Equity Preferred stock, 5,000,000 shares authorized and none issued and outstanding Common stock, $0.01 par value - 50,000,000 authorized; 13,601,456 issued and 13,568,002 outstanding at March 31, 2018; 13,522,168 issued and 13,488,714 outstanding at December 31, 2017 Additional paid-in capital Treasury stock, 33,454 shares at cost, at March 31, 2018 and December 31, 2017, respectively Accumulated deficit Total Stockholders' Equity Total Liabilities and Stockholders' Equity Preferred stock, authorized Preferred stock, issued Preferred stock, outstanding Common stock, par value (in dollars per share) Common stock, authorized Common stock, issued Common Stock, outstanding Treasury stock, shares Income Statement [Abstract] Revenues Cost of Sales Gross Profit Operating Expenses Selling and marketing General and administrative Research and development Total Operating Expenses Loss From Operations Other Income (Expense) Interest income Interest expense Other Income (Expense), net Net Loss Net loss per share - basic and diluted (in dollars per share) Weighted average number of shares used in computing net loss per share - basic and diluted (in shares) Statement [Table] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance beginning Balance beginning (in shares) Stock based compensation Stock based compensation (in shares) Exercise of warrants Exercise of warrants (in shares) Net loss Balance end Balance end (in shares) Statement of Cash Flows [Abstract] Cash Flows From Operating Activities Adjustments to reconcile net income (loss) to net cash and cash equivalents used in operating activities: Bad debt expense Depreciation and amortization Provision for product warranties Stock based compensation Decrease (increase) in: Accounts receivable Inventories Prepaid and other current assets Increase (decrease) in: Accounts payable and accrued expenses Deferred revenue Product warranties Total Adjustments Net Cash Used In Operating Activities Cash Flows from Investing Activities Acquisition of property and equipment Investment in debt securities - held to maturity Investments matured Net Cash Provided By (Used In) Investing Activities Cash Flows from Financing Activities Revolving credit facility, net Net Cash Provided By Financing Activities Net Decrease in Cash and Cash Equivalents Cash and Cash Equivalents - Beginning Cash and Cash Equivalents - Ending Supplemental Disclosure of Cash Flow Information Interest Paid Organization, Consolidation and Presentation of Financial Statements [Abstract] ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Property, Plant and Equipment [Abstract] PROPERTY AND EQUIPMENT Goodwill and Intangible Assets Disclosure [Abstract] PATENT RIGHTS Debt Disclosure [Abstract] REVOLVING CREDIT FACILITY Product Warranties Disclosures [Abstract] PRODUCT WARRANTIES Commitments and Contingencies Disclosure [Abstract] COMMITMENT AND CONTINGENCIES Retirement Benefits [Abstract] EMPLOYEE BENEFIT PLANS Equity [Abstract] STOCKHOLDERS' EQUITY Income Tax Disclosure [Abstract] INCOME TAXES Subsequent Events [Abstract] SUBSEQUENT EVENTS DESCRIPTION OF THE BUSINESS BASIS OF PRESENTATION PRINCIPLES OF CONSOLIDATION USE OF ESTIMATES REVENUE RECOGNITION SEGMENT AND GEOGRAPHICAL INFORMATION CASH AND CASH EQUIVALENTS INVESTMENTS ACCOUNTS RECEIVABLE INVENTORIES EARNINGS PER SHARE ADVERTISING COSTS RECENTLY ISUED ACCOUNTING PRONOUNCEMENT Schedule of deferred revenue Schedule of investment Schedule of antidilutive Schedule of property and equipment Schedule of intangible assets Schedule of amortization expense Schedule of changes in product warranty liability Schedule of future minimum lease payments for operating leases Schedule of warrant activity Schedule of Stock Options, Valuation Assumptions Summary of restricted stock activity Schedule of option activity Deferred Revenue Arrangement, by Type [Table] Deferred Revenue Arrangement [Line Items] Total deferred revenue, current portion Service contracts, net of current portion Total deferred revenue Amortized Cost Gross Unrealized Gain Gross Unrealized Loss Fair Value Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive securities excluded from computation of earnings per share, amount Number of operating segments Reveune percent Cash, FDIC insured amount Cash uninsured amount Allowance for doubtful accounts receivable, current Advertising and promotion expense Deferred offering costs Product warranty term Property, Plant and Equipment [Table] Property, Plant and Equipment [Line Items] Property, plant and equipment, gross Less accumulated depreciation Property and Equipment, Net Property, plant and equipment, useful Life Depreciation expense Gross carrying amount Less accumulated amortization Patent Rights, Net Finite-Lived Intangible Assets, Net [Abstract] 2018 (April 1- December 31, 2018) 2019 2020 2021 2022 Thereafter Amortization expense Debt instrument, term Line of credit facility, maximum borrowing capacity Line of credit percentage of borrowing base to accounts receivables Debt instrument, basis spread on variable rate Debt instrument, interest rate, effective percentage Line of credit, outstanding Line of credit facility, unused capacity, commitment fee percentage Line of credit description Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward] Balance, beginning of period Warranties accrued during the period Payments on warranty claims Balance, end of period Operating Leases, Future Minimum Payments Due [Abstract] 2018 (April 1- December 31, 2018) 2019 2020 2021 2022 Total Payments to suppliers Accounts payable and accrued expenses Lease expiration date Percentage of increase in lease payments Rental expense Manufacturing agreement contract term Expenses related to employee benefit plan Class of Warrant or Right, Outstanding [Roll Forward] Outstanding at beginning Granted Exercised Forfeited Outstanding at ending Exercisable at end Class of Warrant or Right, Exercise Price of Warrants or Rights [Roll Forward] Outstanding at beginning Granted Exercised Forfeited Outstanding at ending Exercisable at ending Class Of Warrant Or Right Weighted Average Remaining Contract Term Of Warrants Or Rights [Roll Forward] Outstanding at beginning Granted Exercised Forfeited Outstanding at ending Exercisable at ending Expected volatility Risk-free interest rate Expected life Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Unvested balance at beginning Granted Vested Forfeited Unvested balance at end Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Rollforward] Unvested balance at beginning Granted Vested Forfeited Unvested balance at end Number of Options Outstanding at beginning Granted Exercised Expired Outstanding at end Exercisable at end Weighted Average Exercise Outstanding at beginning (in dollars per share) Granted (in dollars per share) Exercised Expired Outstanding at end (in dollars per share) Exercisable at end (in dollars per share) Weighted Average Remaining Contractual Term (In Years) Outstanding at beginning Granted Exercised Expired Outstanding at end Exercisable at end Title of Individual [Axis] Common stock,outstanding Description of membership interest Stock compensation expense Weighted average grant date fair value (in dollars per share) Warrant term Number of warrant outstanding Warrant exercise price (in dollars per share) Percentage of offering price Number of warrant granted Warrant granted exercise price (in dollars per share) Date of warrants exercisable Warrant redemption price (in dollars per warrant) Intrinsic value of common stock warrants Number of authorized shares under the plan Vesting period Number of restricted stock granted Initial offering price (in dollars per share) Vesting percentage Description of vesting rights Unrecognized stock compensation expense Reduction of stock compensation expense shares forfeited Reduction of stock compensation expense value forfeited Intrinsic value of the stock options Treasury stock Tax expense Number of warrants or rights cancelled/forfeited. Number of warrants or rights exercisable. Exercise price per share or per unit of warrants or rights cancelled/forfeited. Exercise price per share or per unit of warrants or rights exercisable. Exercise price per share or per unit of warrants or rights exercised. Exercise price per share or per unit of warrants or rights granted. The exercise price percentage of warrants issued. Number of warrants or rights exercised. The expiration term of the warrants or rights issued. Number of warrants or rights granted. The redemption price per share of warrants issued. Weighted average remaining contractual term for warrant outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Weighted average remaining contractual term for warrant outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Weighted average remaining contractual term for warrant outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Weighted average remaining contractual term for warrant cancelled, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Weighted average remaining contractual term for warrant exercisable, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Weighted average remaining contractual term for warrant exercised, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Weighted average remaining contractual term for warrant granted, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Refers to value of common stock warrant intrinsic value as on date. Security that gives the holder the right to purchase shares of stock in accordance with the terms of the instrument, usually upon payment of a specified amount. Information by benchmark of concentration risk. Information by type of deferred revenue arrangement. Description of membership interest in limited liability companies. Information related to equity incentive plan. Information about stock plan. Number of exercise of warrants in shares. Represents the maximum percentage on accounts receivables' amount that can be borrowed under credit facility. Refers to agreement term, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. The annual rate of increase on lease payments. Information by type of long-lived, physical assets used to produce goods and services and not intended for resale. Information about legal entity. Product warranty term, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Information by type of deferred revenue arrangement. A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. Weighted average remaining contractual term for option awards granted, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Weighted average remaining contractual term for option outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Weighted average remaining contractual term for option exertcised, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Information by type of long-lived, physical assets used to produce goods and services and not intended for resale. Information about related party. Assets, Current Assets [Default Label] Liabilities, Current Liabilities Treasury Stock, Common, Value Stockholders' Equity Attributable to Parent Liabilities and Equity Gross Profit Operating Expenses [Default Label] Operating Income (Loss) Interest Expense Nonoperating Income (Expense) Shares, Outstanding Increase (Decrease) in Accounts Receivable Increase (Decrease) in Inventories Increase (Decrease) in Prepaid Expense and Other Assets Increase (Decrease) in Accounts Payable and Accrued Liabilities Standard Product Warranty Accrual, Period Increase (Decrease) Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Operating Activities Payments to Acquire Property, Plant, and Equipment Payments to Acquire Held-to-maturity Securities Net Cash Provided by (Used in) Investing Activities Net Cash Provided by (Used in) Financing Activities Cash and Cash Equivalents, Period Increase (Decrease) Deferred Revenue Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Finite-Lived Intangible Assets, Accumulated Amortization Standard and Extended Product Warranty Accrual, Decrease for Payments Operating Leases, Future Minimum Payments, Remainder of Fiscal Year Operating Leases, Future Minimum Payments, Due in Two Years Operating Leases, Future Minimum Payments, Due in Three Years Operating Leases, Future Minimum Payments, Due in Four Years Operating Leases, Future Minimum Payments, Due in Five Years Operating Leases, Future Minimum Payments Due Accounts Payable, Trade, Current Transfer of Inventory Unit to Property and Equipment Service Contracts [Member] [Default Label] ClassOfWarrantOrRightExercisePriceOfWarrantsOrRightsCancelledForfeited ClassOfWarrantOrRightExercisePriceOfWarrantsOrRightsExercisable ClassOfWarrantOrRightWeightedAverageRemainingContractTermOfWarrantsOrRightsGranted ClassOfWarrantOrRightWeightedAverageRemainingContractTermOfWarrantsOrRightsExercised Operating Lease, Percentage of Increase in Lease payments Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Share-based Compensation Arrangement by Share-based Payment Award, Option, Nonvested, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Granted (in years) SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisedOptionsWeightedAverageRemainingContractualTerm2 Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period