2020 (Remainder) Net loss incurred on valuation of inventory at lower of cost or market value and write-off of obsolete inventory Anti-dilutive options not included in the computations (in shares) Estimated fair value, less than 12 months Industrial Property [Member] Leases Income Taxes Entity Registrant Name Entity Central Index Key Trading Symbol Current Fiscal Year End Date Entity Filer Category Entity Current Reporting Status Entity Emerging Growth Company Entity Small Business Entity Common Stock, Shares Outstanding (in shares) Entity Shell Company Document Type Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Amendment Flag Title of 12(b) Security Statement of Financial Position [Abstract] Statement [Table] Statement [Line Items] Current assets: Income Taxes Paid, Net Marketable securities Accounts Receivable, after Allowance for Credit Loss, Current Inventory, Net Inventories, net Prepaid expenses and other assets Total current assets Assets, Current Long-term marketable securities Total long-term inventory Long-term inventories, net Property and equipment, net Operating lease right-of-use assets Operating lease - right of use assets, net Intangibles, net Other assets Total assets Assets Current liabilities: Accounts payable Accrued liabilities Contract with Customer, Liability, Current Deferred product revenue Total current liabilities Liabilities, Current Operating Lease, Liability, Noncurrent Operating lease liability Other long-term liabilities Total liabilities Liabilities Shareholders' equity: Common stock, par value $0.001, 50,000,000 shares authorized, 16,650,725 and 16,650,725 shares issued and outstanding Common Stock, Value, Issued Additional paid-in capital Accumulated other comprehensive loss Accumulated deficit Balance, end of period Balance, beginning of period Total shareholders' equity Stockholders' Equity Attributable to Parent Total liabilities and shareholders' equity Liabilities and Equity Allowance for doubtful accounts Common Stock, Par or Stated Value Per Share Common stock, shares authorized (in shares) Common stock, shares issued (in shares) Common stock, shares outstanding (in shares) Income Statement [Abstract] Revenue Revenue from Contract with Customer, Including Assessed Tax Cost of goods sold Gross profit Gross Profit Operating expenses: Sales and marketing Research and product development General and administrative Total operating expenses Operating Expenses Operating loss Operating Income (Loss) Other income, net Loss before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Provision for (benefit from) income taxes Net loss Net loss Net loss Basic weighted average shares outstanding (in shares) Diluted weighted average shares outstanding (in shares) Basic loss per share (in dollars per share) Basic loss per common share (in dollars per share) Diluted loss per share (in dollars per share) Diluted loss per common share (in dollars per share) Comprehensive loss: Unrealized gain (loss) on available-for-sale securities, net of tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Change in foreign currency translation adjustment Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Statement of Cash Flows [Abstract] Cash flows from operating activities: Adjustments to reconcile net loss to net cash used in operating activities: Cash and cash equivalents at the end of the period Cash and cash equivalents at the beginning of the period Stock-based compensation expense Provision for doubtful accounts, net Inventory Write-down Changes in operating assets and liabilities: Receivables Increase (Decrease) in Receivables Inventories Increase (Decrease) in Inventories Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Increase (Decrease) in Accounts Payable Accounts payable Accrued liabilities Increase (Decrease) in Accrued Liabilities Income taxes payable Deferred product revenue Increase (Decrease) in Deferred Revenue The amount of increase (decrease) in operating lease liabilities. Operating lease liabilities Net cash provided by (used in) operating activities Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Represents payments for capitalized patent defense costs. Capitalized patent defense costs Capitalized Patent Defense Costs Proceeds from maturities and sales of marketable securities Purchases of marketable securities Payments to Acquire Marketable Securities Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Cash flows from financing activities: Net proceeds from equity-based compensation programs Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Effect of exchange rate changes on cash and cash equivalents Net decrease in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash paid for income taxes Litigation Case [Axis] Litigation Case [Domain] Information pertaining to the litigation for intellectual property infringement. Litigation for Intellectual Property Infringement [Member] Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Revenue from Contract with Customer [Text Block] Earnings Per Share [Text Block] Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Inventory Disclosure [Text Block] Lease Arrangement, Type [Axis] Lease Arrangement, Type [Domain] Stockholders' Equity Note Disclosure [Text Block] Plan Name [Axis] Plan Name [Domain] The equity incentive plan approved by the company in 2007. Equity Incentive Plan 2007 [Member] Fair Value Disclosures [Text Block] Income Tax Disclosure [Text Block] Basis of Presentation: Significant Accounting Policies: Disclosure of accounting policy for liquidity. Liquidity, Policy [Policy Text Block] Schedule disaggregates the Company’s revenue into primary product groups and major regions Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Available-for-sale Securities, Debt Maturities [Table Text Block] Tabular disclosure of maturities of available-for-sale securities. Schedule of maturities of marketable securities classified as available-for-sale securities Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] Finite-lived Intangible Assets Amortization Expense [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Tabular disclosure of inventories. Schedule of Inventory Current and Noncurrent [Table Text Block] Lessee, Operating Lease, Liability, Maturity [Table Text Block] Schedule of Stockholders Equity [Table Text Block] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Operating Lease, Liability Operating Lease, Liability, Total Total operating lease liabilities Amount of a company's current assets minus the amount of its current liabilities. Working capital Working Capital (Deficit) Increase of cash used in operating activities Increase (Decrease) in Net Cash Provided By (Used in) Operating Activities Amount of increase (decrease) in the amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. Litigation settlement expense Litigation Settlement, Expense Product and Service [Axis] Product and Service [Domain] Represents information pertaining to Audio Conferencing. Audio Conferencing [Member] Represents information pertaining to Microphones. Microphones [Member] Information related to video products. Video Products [Member] Geographical [Axis] Geographical [Domain] Americas [Member] Information related to the regions of Asia, the Middle East and Australia. Asia, Middle East and Australia [Member] Information related to the regions of Europe and Africa. Europe and Africa [Member] Dilutive common stock equivalents using treasury stock method (in shares) Weighted average options outstanding (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Financial Instrument [Axis] Financial Instruments [Domain] Corporate bonds and notes [Member] Municipal bonds [Member] Amortized cost Gross unrealized holding gains Gross unrealized holding losses Estimated fair value Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Total Due within one year, amortized cost Due within one year, estimated fair value Due after one year through five years, estimated fair value Total available-for-sale securities, amortized cost Debt Securities, Available-for-sale, Amortized Cost Total available-for-sale securities, estimated fair value Debt Securities, Available-for-sale Gross unrealized holding losses Gross unrealized holding losses, less than 12 months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Estimated fair value Gross unrealized holding losses, more than 12 months Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Tradename [Member] Represents information pertaining to Patents and Technological Know-how. Patents and Technological Know-how [Member] Proprietary software [Member] Proprietary Software [Member] Other [Member] Statistical Measurement [Axis] Statistical Measurement [Domain] Minimum [Member] Maximum [Member] Estimated useful lives (in years) Finite-Lived Intangible Asset, Useful Life Finite-Lived Intangible Assets, Gross Intangible assets, gross Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Total intangible assets, net Finite-Lived Intangible Assets, Net Amortization of Intangible Assets Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 2020 (Remainder) Basis of Accounting, Policy [Policy Text Block] 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2023 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2024 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive Inventory, Raw Materials, Net of Reserves Raw materials Inventory, Finished Goods, Net of Reserves Finished goods Inventory Noncurrent Raw Materials Net of Reserves Raw materials Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items that are classified as noncurrent. Schedule of changes in stockholders' equity Inventory Noncurrent Finished Goods Net of Reserves Finished goods Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are classified as noncurrent. Area of real estate property Area of Real Estate Property Lessee, Operating Lease, Renewal Term Lessee, Operating Lease, Renewal Term Operating Lease, Expense Rent expense Operating cash flows from operating leases Operating leases Operating Lease, Liability, Current Current portion of operating lease liabilities, included in accrued liabilities Weighted average remaining lease term for operating leases (in years) (Year) Weighted average discount rate for operating leases Lessee, Operating Lease, Liability, Payments, Due Year Two 2021 Lessee, Operating Lease, Liability, Payments, Due Year Three 2022 Lessee, Operating Lease, Liability, Payments, Due Year Four 2023 Thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Five Total lease payments Lessee, Operating Lease, Liability, Payments, Due Less: Imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Equity Components [Axis] Equity Component [Domain] Common stock and additional paid-in capital [Member] Accumulated other comprehensive loss [Member] Retained earnings [Member] Share-based compensation expense APIC, Share-based Payment Arrangement, Increase for Cost Recognition Proceeds from employee stock purchase plan Unrealized gain (loss) on available-for-sale securities, net of tax Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax Stock repurchased Stock Repurchased During Period, Value Cash dividends, $0.07 per share Impact on retained earnings for change in revenue recognition policy Cumulative Effect of New Accounting Principle in Period of Adoption Cash dividends, per share (in dollars per share) Number of shares authorized Number of options, outstanding Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Options outstanding at end of year (in shares) Options outstanding at beginning of year (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Represents the number of shares authorized but not issued. Number of authorized unissued options Share-based Compensation Arrangement by Share-based Payment Award Number of Shares Authorized and Unissued Total compensation cost related to stock options not yet recognized hare-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Compensation cost related to stock options expected to be recognized (in years) Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Total intrinsic value of options outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice Options outstanding at beginning of year (in dollars per share) Options outstanding at end of year (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Number of shares, exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Number of shares, forfeited prior to vesting (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Number of shares, canceled or expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Income Statement Location [Axis] Income Statement Location [Domain] Cost of goods sold [Member] Sales and marketing [Member] Research and product development [Member] General and administrative [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Level 1 [Member] Level 2 [Member] Level 3 [Member] Document and Entity Information [Abstract] Assets [Abstract] ASSETS Liabilities and Equity [Abstract] LIABILITIES AND SHAREHOLDERS' EQUITY Fair Value Measurements Fair Value, Recurring and Nonrecurring [Table] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Corporate Debt Securities [Member] US States and Political Subdivisions Debt Securities [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] Available-for-sale Securities Depreciation, Depletion and Amortization, Nonproduction Proceeds from Sale and Maturity of Marketable Securities Supplemental Cash Flow Information [Abstract] Depreciation and amortization expense Supplemental cash flow activities: Amount of amortization expense attributable to right-of-use asset from operating lease. Amount of amortization expense attributable to right-of-use asset from operating lease. Operating Lease, Right of Use Asset Amortization Amortization of right-of-use assets Fair Value Measurements Cash and cash equivalents Leases Schedule of Operating Leased Assets [Table] Cash and Cash Equivalents, at Carrying Value Marketable Securities, Current Receivables, net of allowance for doubtful accounts of $439 and $424, respectively Total current inventory Prepaid Expense and Other Assets, Current Marketable Securities, Noncurrent Inventory, Noncurrent Property, Plant and Equipment, Net Operating Lease, Right-of-Use Asset Intangible Assets, Net (Excluding Goodwill) Other Assets, Noncurrent Liabilities, Current [Abstract] Accounts Payable, Current Accrued Liabilities, Current Operating lease liabilities, net of current portion Other Liabilities, Noncurrent Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Additional Paid in Capital, Common Stock Accumulated Other Comprehensive Income (Loss), Net of Tax Stock-based Compensation Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Retained Earnings (Accumulated Deficit) Stock-based Compensation Share-based Compensation Accounts Receivable, Allowance for Credit Loss, Current Cost of Sales [Member] Selling and Marketing Expense [Member] Common stock, par value (in dollars per share) Research and Development Expense [Member] Common Stock, Shares Authorized General and Administrative Expense [Member] Common Stock, Shares, Issued Common Stock, Shares, Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Number of shares, granted (in shares) Weighted average exercise price, granted (in dollars per share) Weighted average exercise price, exercised (in dollars per share) Weighted average exercise price, forfeited prior to vesting (in dollars per share) Weighted average exercise price, canceled or expired (in dollars per share) Options exercisable at end of year (in shares) Options exercisable at end of year (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Shareholders' Equity Cost of Goods and Services Sold Operating Expenses [Abstract] Selling and Marketing Expense Research and Development Expense General and Administrative Expense Other Nonoperating Income (Expense) Income Tax Expense (Benefit) Common Stock Including Additional Paid in Capital [Member] AOCI Attributable to Parent [Member] Net Income (Loss) Attributable to Parent Retained Earnings [Member] Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Diluted Earnings Per Share, Basic Shareholders' Equity Earnings Per Share, Diluted Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax Foreign currency translation adjustment Leases Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Share-based Payment Arrangement, Noncash Expense Accounts Receivable, Credit Loss Expense (Reversal) Change of inventory to net realizable value Increase (Decrease) in Operating Capital [Abstract] Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable Increase (Decrease) in Operating Lease Liabilities Net Cash Provided by (Used in) Investing Activities [Abstract] Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds, Issuance of Shares, Share-based Payment Arrangement, Including Option Exercised Effect of Exchange Rate on Cash and Cash Equivalents Facility to support, research and development activity [Member] Facility to support, principal administrative, sales, marketing, customer support, and research and product development activity [Member] Warehouse to support, primary inventory fulfillment and repair center [Member] Business Description, Basis of Presentation and Significant Accounting Policies Business Description, Basis of Presentation and Significant Accounting Policies Gainesville, Florida [Member] Salt Lake City, Utah [Member] Austin, Texas [Member] Zaragoza, Spain [Member] Chennai, India [Member] Shenzhen, China [Member] Office Building [Member] Revenue Information Warehouse [Member] FLORIDA UTAH Revenue Information TEXAS SPAIN INDIA CHINA Earnings (Loss) Per Share Earnings (Loss) Per Share Operating Leased Assets [Line Items] Marketable Securities Marketable Securities Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Intangible Assets Inventories Inventories Leases of Lessee Disclosure [Text Block] Leases Shareholders' Equity Fair Value Measurements Facility to support manufacturing [Member] Manufacturing Facility [Member] Income Taxes New Accounting Pronouncements, Policy [Policy Text Block] Liquidity: Disaggregation of Revenue [Table Text Block] Schedule of the computation of basic and diluted earnings (loss) per common share Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets [Line Items] Schedule of amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value for available-for-sale securities by major security type and class of security Schedule of available-for-sale marketable securities in a gross unrealized loss position Schedule of intangible assets and estimated useful lives Trade Names [Member] Patents and technological know-how [Member] Represents information pertaining to Proprietary Software. Schedule of amortization of intangible assets Other Intangible Assets [Member] Schedule of estimated future amortization expense of intangible assets Minimum [Member] Maximum [Member] Schedule of Inventories, net of reserves Amortization of intangible assets Schedule of Rent Expense [Table Text Block] Schedule of supplemental cash flow and balance sheet information related to leases Schedule of rent expense Lessee, Operating Lease, Disclosure [Table Text Block] Schedule of maturities of operating lease liabilities Operating Lease, Payments Schedule of fair value of the financial instruments Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Discount Rate, Percent Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 2024 Lessee, Operating Lease, Liability, Payments, Due Year Five Cash Flow, Operating Activities, Lessee [Abstract] Lease, Cost [Abstract] Cash paid for amounts included in the measurement of lease liabilities: Right-of-use assets obtained in exchange for lease obligations: Marketable Securities [Table] Marketable Securities [Line Items] Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Estimated fair value, more than 12 months Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Operating lease liability Litigation for Intellectual Property Infringement [Member] Schedule of Product Information [Table] Product Information [Line Items] Audio conferencing [Member] Microphones [Member] Video products [Member] North and South America [Member] Common Stock, Dividends, Per Share, Cash Paid Asia (including Middle East) and Australia [Member] Europe and Africa [Member] Retained earnings (accumulated deficit) [Member] Revenue [Line Items] Stock Issued During Period, Value, Employee Stock Purchase Plan Loss Contingencies [Table] Loss Contingencies [Line Items] Incremental Common Shares Attributable to Dilutive Effect of Equity Unit Purchase Agreements Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Available-for-sale Securities, Amortized Cost Basis Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value Due after one year through five years, amortized cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value Due after five years, amortized cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost Due after five years, estimated fair value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value Related Party Transaction, Rate Debt Instrument, Basis Spread on Variable Rate Class of Warrant or Right, Number of Securities Called by Each Warrant or Right Warrants to purchase of common stock, shares Proceeds from Issuance of Long-term Debt Debt Instrument [Line Items] Beneficial Owner [Member] Related Party [Domain] Related Party [Axis] Common Stock [Member] Warrant [Member] Convertible Debt [Member] Convertibles and Bonds with Warrants Attached [Member] Long-term Debt, Type [Domain] Long-term Debt, Type [Axis] Schedule of Long-term Debt Instruments [Table] Schedule of maturities of principal amount contained in the Notes Schedule of carrying value of Notes and Warrants Schedule of Maturities of Long-term Debt [Table Text Block] Schedule of Warrants, Valuation assumptions, Black-Scholes method Convertible Debt [Table Text Block] Senior Convertible Notes and Warrants Schedule of Warrants, Valuation assumptions [Table Text Block] Long-term Debt [Text Block] Senior Convertible Notes and Warrants Tabular disclosure of the significant assumptions used during the year to estimate the fair value of warrants using black-scholes method. Dividends, Common Stock, Cash Schedule of Net Loss Incurred on Valuation of Inventory at Lower of Cost or Market Value and Write Off of Obsolete Inventory [Table Text Block] Schedule of net loss incurred on valuation of inventory at lower of cost or market value and write-off of obsolete inventory Tabular disclosure of the net loss incurred on valuation of inventory at lower of cost or market value and write-off of obsolete inventory. Debt Instrument, Description of Variable Rate Basis Debt Instrument, Convertible, Conversion Price Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger Senior Convertible Notes, Threshold percentage of stock price trigger Debt Instrument, Convertible, Threshold Consecutive Trading Days Class of Warrant or Right, Exercise Price of Warrants or Rights Payments of Debt Issuance Costs Proceeds from Convertible Debt Senior Convertible Notes and Warrants Senior Convertible Notes Warrants Common Stock Beneficial owner Greater of Senior Convertible Notes and Warrants Issuance and sale of secured convertible notes Common stock, par value Beneficial owner of the Company’s issued and outstanding shares of Common Stock Interest accrual at a variable rate adjusted on a quarterly basis, percent Published in the Wall Street Journal (New York edition) as of the beginning of such calendar quarter Senior Convertible Notes, Initial conversion price per share Senior Convertible Notes, Threshold consecutive trading days Warrants, Initial exercise price per share Original issue discount and issuance costs Net proceeds after original issue discount and issuance costs Fair Value Measurement Inputs and Valuation Techniques [Table] Measurement Input Type [Axis] Measurement Input Type [Domain] Measurement Input, Risk Free Interest Rate [Member] Measurement Input, Expected Term [Member] Measurement Input, Price Volatility [Member] Measurement Input, Expected Dividend Rate [Member] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Expected life of Warrants (years) Risk-free interest rate Expected life of Warrants Expected price volatility Expected dividend yield Warrants, Valuation assumptions, Black-Scholes method Warrants and Rights Outstanding, Term Long-term Debt, Unclassified [Abstract] Principal Less: debt discount and issuance costs, net of amortization Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Net carrying amount Warrants [Abstract] Equity component(1): Warrant Instrument Convertible Beneficial Conversion Feature Conversion feature Amount of a favorable spread to a warrant holder between the amount of warrant being converted and the value of the securities received upon conversion. Warrants and Rights Outstanding Liability component: Long-term Debt, Gross Long-term Debt Net carrying amount Long-term Debt, Fiscal Year Maturity [Abstract] Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2020 Long-term Debt, Maturities, Repayments of Principal in Year Two Long-term Debt, Maturities, Repayments of Principal in Year Three Long-term Debt, Maturities, Repayments of Principal in Year Four Senior Convertible Notes, Principal Amount Maturing 2021 2022 2023 Net carrying amount Amount of warrants, including conversion feature of warrants. Warrants Warrants Carrying Amount Warrants and Rights Outstanding Percentage Interest rate assumption used in valuing an instrument. Warrants, assumptions rate Interest expense Interest Expense Subsequent events Subsequent Events [Text Block] Subsequent events Convertible Notes Payable, Noncurrent Senior convertible notes Security Exchange Name Interest Paid, Discontinued Operations Interest paid Entity Interactive Data Current Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event [Member] Loans Payable [Member] Debt Instrument [Axis] Debt Instrument, Name [Domain] Federal Home Loan Bank Advances [Member] Subsequent Event [Line Items] Proceeds from Issuance of Unsecured Debt Debt Instrument, Interest Rate, Stated Percentage Paycheck Protection Program Loan US Bancorp Proceeds of the Loan Interest rate of the loan Subsequent events Subsequent events Amortization of Debt Issuance Costs and Discounts Amortization of debt discount and issuance costs Payments for (Proceeds from) Intangible Assets Purchase of intangibles The net cash outflow or inflow from purchases, sales and disposals of intangibles assets.