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Accrued Compensation And Non-financing Liabilities Accrued liabilities and compensation Total accrued liabilities Tabular disclosure of the changes in outstanding nonvested restricted stock units and performance stock units. Schedule of Nonvested Restricted Stock Units Activity and Performance Stock Units [Table Text Block] Schedule of Company RSU and PSU activity Commitments and Contingencies Commitments and Contingencies (Note 10) Diluted Weighted Average Number of Shares Outstanding, Diluted Diluted weighted average common shares outstanding Adjustments Or Reconciling Items Adjustments Or Reconciling Items Adjustments or reconciling items APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Stock-based compensation Minimum [Member] Minimum Private Placement [Member] Private Placement Preferred Stock, Shares Outstanding Shares of preferred stock outstanding Fair Value, Recurring [Member] Fair value on a recurring basis Common Stock, Shares, Issued Common stock, shares issued Segment Reporting Information [Line Items] Segment Information Accounts and Other Receivables, Net, Current Other receivables Debt Instrument, Face Amount Convertible note, aggregate principal Income Tax Expense (Benefit) Income tax expense Income tax benefit Loss Contingency Settlement Agreement Cash Loss Contingency, Settlement Agreement, Cash Class action lawsuit - settlement payable in cash Number Of Days Of Notice To Be Given For Conversion Of Notes Into Common Stock Number Of Days Of Notice To Be Given For Conversion Of Notes Into Common Stock Number of days of notice to be given for conversion of notes into common stock Represents information relating to partitioned notes. Partitioned Notes Class of Warrant or Right, Number of Securities Called by Warrants or Rights Operating Segments [Member] Operating segment Stock Issued During Period, Value, Conversion of Convertible Securities Issuance of stock for convertible note repayment Going concern. Going Concern [Policy Text Block] Going concern Warrants issued to placement agent. Warrants Issued To Placement Agent Warrants issued to placement agent Treasury stock, $0.001 par value; 286 shares at August 31, 2026 and May 31, 2026 Treasury Stock, Common, Value Subsequent Event Type [Domain] Number of warrants outstanding and exercisable. Class of Warrant or Right, Outstanding and Exercisable Warrants outstanding and exercisable Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Less: imputed interest Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms Weighted average remaining contractual life in years The amount of non current portion of accrued interest on debt. Accrued Interest, Noncurrent Accrued interest on convertible notes Schedule of Long-Term Debt Instruments [Table] Share-Based Compensation Arrangement by Share-Based Payment Award, Percentage of Outstanding Stock Maximum Percentage of share outstanding General and Administrative Expense, Total General and Administrative Expense General and administrative Consolidated Statements of Operations PSUs forfeited Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Long Term Convertible Note April Twenty Three Twenty Twenty One Note [Member] Long Term Convertible Note April Twenty Three Twenty Twenty One Note [Member] Long-term Convertible Note - April 23, 2021 Note Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures Granted Vesting [Axis] 2012 Equity Incentive Plan Two Thousand Twelve Stock Incentive Plan [Member] 2012 Equity Incentive Plan Basic loss per share Earnings Per Share, Basic Basic (loss) income per share Document Period End Date Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accrued Liabilities and Compensation Series B Preferred Stock [Member] Series B Convertible Preferred Stock Convertible Notes Payable Outstanding balance, ending Outstanding balance, beginning Debt Instrument [Line Items] Debt Instrument Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Granted (in dollars per share) Common Stock, Shares Authorized Common stock, shares authorized Consolidated Statement of Changes in Stockholders' Deficit Share-Based Payment Arrangement, Performance Shares, Activity [Table Text Block] Schedule of PSU activity Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Fiscal Year Gains (Losses) on Restructuring of Debt Gain on restructuring of payables Gain on restructuring of payables Tabular disclosure of supplemental information relating to operating leases. Schedule of Operating Lease Supplemental Information [Table Text Block] Schedule of supplemental information relating to operating leases Debt Instrument, Interest Rate, Stated Percentage Interest rate per annum Interest rate Costs and Expenses Total operating expenses Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Aggregate intrinsic value in outstanding Assets Total assets Title of 12(b) Security Preferred Stock, Value, Issued Preferred stock Number of PSUs Ending balance Number of PSUs Beginning balance Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Stock Issued During Period, Value, Stock Options Exercised Stock option exercises No Trading Symbol Flag Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Stock option granted, Shares Antidilutive Securities, Name [Domain] Proceeds from Issuance of Private Placement Gross proceeds Proceeds, net of issuance costs 2028 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Weighted average exercise price Interest Paid, Excluding Capitalized Interest, Operating Activities Cash paid for interest Percentage of SharesIssued as Commitment Fee Percentage Of Shares Issued As Commitment Fee Percentage of shares issued as commitment fee Weighted average exercise price of warrant or rights forfeited, expired and cancelled. Class of Warrants or Rights, Forfeited, Expired and Cancelled, Weighted Average Exercise Price Forfeited, expired, and cancelled (in dollars per share) Subsidiary or Equity Method Investee, Sale of Stock, Type [Table] Lessee, Operating Lease, Liability, to be Paid, Year One 2028 Number of Share in Unit Number of Share in a Unit Number of share in a unit Cash and Cash Equivalents [Domain] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Weighted average remaining contractual life in years Tabular presentation of location of operating lease disclosures in statement of financial position. Lessee, Operating Lease, Schedule Of Presentation In Statement Of Financial Position [Table Text Block] Schedule of operating lease balances Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of reconciliation to the consolidated net income (loss) Equity, Attributable to Parent Ending balance Beginning balance Total stockholders' deficit Treasury Stock, Common [Member] Treasury stock Entity Address, Address Line Two Other Assets, Noncurrent Other non-current assets Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Income Tax Disclosure [Text Block] Income Taxes Loss per share Earnings Per Share [Text Block] Amount of general and administrative expense excluding share based compensation. General And Administrative Expense Excluding Share Based Compensation General and administrative expense Percentage of Shares to Be Issued as Commitment Fee Percentage Of Shares To Be Issued As Commitment Fee Percentage of shares issuable as commitment fee on six-month anniversary of Purchase Agreement Estimate of Fair Value Measurement [Member] Total estimated fair value Number of Reportable Segments Number of reporting segment Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Weighted average grant date fair value Basis of Accounting, Policy [Policy Text Block] Basis of presentation Long-Term Debt Outstanding convertible notes payable and accrued interest Stock, Class of Stock [Table] Schedule of Stock by Class [Table] Amount of share based compensation recognized in research and development expenses. Research And Development Expense, Share Based Compensation Share based compensation recognized in research and development expense Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares Stock option vested, Shares Proceeds from Stock Options Exercised Proceeds from exercise of stock options Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants Warrant exercises Fair Value of Financial Instruments, Policy [Policy Text Block] Fair value of financial instruments Statistical Measurement [Axis] Money Market Funds [Member] Money market funds Entity Interactive Data Current Gain (Loss) on Extinguishment of Debt Gain (Loss) on Extinguishment of Debt, Total Loss on note extinguishment Loss on note extinguishment Common stock, $0.001 par value; 2,250,000 shares authorized; 1,454,639 and 1,373,803 issued, and 1,454,353 and 1,373,517 outstanding at August 31, 2026 and May 31, 2026, respectively Common Stock, Value, Issued Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of reconciliation of the numerators and denominators of basic and diluted net (loss) income per share Liabilities Total liabilities Less: Accrued preferred stock dividends Preferred Stock Dividends and Other Adjustments Less: Accrued preferred stock dividends Share-Based Payment Arrangement, Tranche Two [Member] Tranche Two Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of assets and liabilities that are measured at fair value on a recurring basis Retained Earnings (Accumulated Deficit) Accumulated deficit Convertible Preferred Stock [Member] Convertible preferred stock Cash and Cash Equivalents, Fair Value Disclosure Cash Cash and cash equivalents Conversion of Stock, Shares Issued Conversion of Series C preferred stock to common stock (in shares) Preferred Stock, Convertible, Shares Issuable Total shares of common stock if converted Vesting [Domain] Amount of accrued clinical expenses. Accrued Clinical Expenses Clinical expense Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Organization Maximum Share Commitment Amount Maximum Share Commitment Amount Maximum share commitment amount Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Award vesting period Shares Issued, Price Per Share Purchase price per unit Stock Including Cash Payment Stock Including Cash Payment Standby equity purchase agreement commitment fee Stock issued for private offerings (in shares) Stock Issued During Period, Shares, New Issues Stock issued for tender offer (in shares) Increase (Decrease) in Prepaid Expense Prepaid expenses and other assets Derivative, Term of Contract Term of purchase agreement Convertible Debt Securities [Member] Convertible notes Class of Warrant or Right, Outstanding Warrants outstanding at end of period Warrants outstanding beginning of period Represents the portion of interest accrued in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs. Interest Expense, Accrued Interest expense Represents information pertaining to placement agent warrants. Placement Agent Warrants Placement Agent Warrants Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Forfeited, expired, and cancelled (in dollars per share) Operating Lease, Cost Operating lease costs Finance charges related to interest expense. Finance Charge Adjustments Finance charges Subsequent Events [Text Block] Subsequent Events Repayments of Notes Payable Cash paid for note payable The amount of intrinsic value of outstanding warrants. Class of Warrants or Rights, Outstanding, Aggregate Intrinsic Value Aggregate intrinsic value outstanding of end period Aggregate intrinsic value outstanding of beginning Condensed Cash Flow Statement [Table] Operating Lease, Liability, Current Current operating lease liability Ending Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Beginning Debt Instrument, Convertible, Conversion Ratio Common stock conversion rate Liabilities and Equity Total liabilities and stockholders' deficit Amount of research and development expense excluding share based compensation and return of clinical expenses. Research And Development Expense Excluding Share Based Compensation And Return Of Clinical Expenses Research and development Treasury bills Cash Equivalent, US Government Security, Carrying Value 2030 Lessee, Operating Lease, Liability, to be Paid, Rolling Year Three Document Fiscal Period Focus Weighted average remaining contractual term of warrants outstanding. Class of Warrants or Rights, Outstanding, Weighted Average Remaining Contractual Term Weighted average remaining contractual life in years Tabular disclosure for outstanding balances of convertible notes. Convertible Notes Outstanding Balance [Table Text Block] Schedule of outstanding balances of convertible notes and accrued interest Depreciation, Depletion and Amortization, Nonproduction Depreciation Granted (in dollars per share) Weighted average exercise price of warrant or rights granted. Class of Warrants or Rights, Granted, Weighted Average Exercise Price Performance Shares [Member] PSU Percentage of qualifying revenue generated in each calendar year based on which payment to be made for the contractual obligation due. Contractual Obligation, Percentage of Qualifying Revenue Agreed to Pay Contractual obligation, percentage of qualifying revenue agreed to pay Structuring Fee Expense Structuring Fee Expense Structuring fee Number of Warrant in Unit Number of Warrant in a Unit Number of warrant in a unit Sale of Stock [Axis] Weighted average remaining contractual term of warrants outstanding and exercisable. Class of Warrants or Rights, Outstanding and Exercisable, Weighted Average Remaining Contractual Term Weighted average remaining contractual life in years outstanding and exercisable Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net change in cash and cash equivalents Entity Current Reporting Status Use of Estimates, Policy [Policy Text Block] Use of estimates Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Options outstanding and exercisable (in shares) Class of Stock [Domain] Accounts Payable, Current Accounts payable Schedule of computation of diluted weighted average number of shares of common stock outstanding Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Loss Contingency Settlement Agreement Share Loss Contingency, Settlement Agreement, Share Class action lawsuit - settlement payable in shares (in shares) Document Transition Report Commitments and Contingencies. Subsequent Event [Line Items] Subsequent Events Class of Warrant or Right [Axis] Research and development (income) and or expense. Research and development Income Expense Research and development Liabilities, Current [Abstract] Current liabilities: Equity Incentive Plan Cash [Member] Cash Common Stock [Member] Common stock Amount of share based compensation recognized in general and administrative expenses. General And Administrative Expense, Share Based Compensation Share based compensation recognized in general and administrative expense Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract] Effect of dilutive securities: Statistical Measurement [Domain] Prepaid Expense, Current Prepaid expenses Equity, Attributable to Parent [Abstract] Stockholders' deficit: Basic Weighted Average Number of Shares Outstanding, Basic Basic weighted average common shares outstanding Assets [Abstract] Assets Share Price Threshold Percentage of Lowest Daily Volume Weighted Average Price Share Price, Threshold Percentage Of Lowest Daily Volume Weighted Average Price Volume weighted average price Entity Central Index Key Antidilutive Securities [Axis] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Aggregate intrinsic value in outstanding and exercisable Class of Stock [Line Items] Class of Stock Consolidation Items [Axis] Current Fiscal Year End Date Class of Warrant or Right [Domain] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Number of shares Document Quarterly Report Diluted net loss applicable to common stockholders Net Income (Loss) Available to Common Stockholders, Diluted Diluted net (loss) income applicable to common stockholders Cash and Cash Equivalents [Axis] Proceeds from issuance of common stock and warrants. Proceeds From Issuance Of Common Stock And Warrants Proceeds from sale of common stock and warrants, net of issuance costs Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Options outstanding at the end of the period (in dollars per share) Options outstanding at the beginning of the period (in dollars per share) Net Cash Provided by (Used in) Operating Activities Net cash used in operating activities Entity Incorporation, State or Country Code Diluted loss per share Earnings Per Share, Diluted Diluted (loss) income per share Preferred Stock, Par or Stated Value Per Share Preferred stock, par value Operating Lease, Weighted Average Discount Rate, Percent Weighted average discount rate Net loss Net loss Net Income (Loss) Attributable to Parent Net (loss) income Forfeited, expired, and cancelled Number of warrants forfeited , expired and cancelled during the reporting period. Class of Warrants or Rights Forfeited, Expired and Cancelled Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Debt Conversion, Converted Instrument, Shares Issued Shares issued on debt conversion Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on warrants exercised (or share units converted) into shares. Class of Warrant or Right, Exercises in Period, Aggregate Intrinsic Value Aggregate intrinsic value exercised Threshold Days for Prior Written Notice Upon Termination Threshold Days For Prior Written Notice Upon Termination Prior written notice for termination (in days) Measurement Frequency [Domain] Equity Components [Axis] Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities: Consolidated Statements of Cash Flows Income Taxes Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Exercised (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Stock options grant date fair value (in dollar per share) Preferred Stock Liquidating Preference Preferred stock, liquidation preference per share ($ per share) Fair Value Disclosures [Text Block] Fair Value Measurement Stock Options, Performance Share Units And Warrants [Member] Represents information pertaining to stock options, performance share units and warrants. Stock options, PSUs, and warrants Tranche Three Share-Based Payment Arrangement, Tranche Three [Member] Amount of contractual obligation excluding non-contingent amount. Contractual Obligation Excluding Noncontingent Amount Amount of contractual obligation included in other liabilities Preferred Stock, Shares Authorized Preferred stock, shares authorized Placement Agent Cash Fee as Percentage of Gross Proceeds of Offering Placement Agent Cash Fee As Percentage Of Gross Proceeds Of Offering Percent of gross proceeds as placement agent fee Stock Issued During Period Units New Issues Stock Issued During Period, Units, New Issues Number of units sold Class of Stock [Axis] Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive securities excluded from computation of income (loss) per common share Series C Preferred Stock [Member] Series C Convertible Preferred Stock The aggregate amount of interest and other income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Interest and Nonoperating Income (Expense) Total interest and other expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Accounts payable, accrued expenses, and other liabilities Class of Warrant or Right, Number of Securities Called by Each Warrant or Right Number of shares per warrant Equity Incentive Plan [Member] Equity Incentive Plan [Member] Equity Incentive Plan Tabular disclosure of information on dividends relating to convertible preferred stock. Schedule of Information on Dividends of Convertible Preferred Stock [Table Text Block] Schedule of information on dividends of convertible preferred stock Debt Instrument, Convertible, Conversion Price Conversion price per share upon five trading days' notice Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Share-based Compensation Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Options outstanding at the end of the period Options outstanding at the beginning of the period Class of Warrant or Right Number of Warrants or Rights Issued Class of Warrant or Right, Number Of Warrants Or Rights Issued Number of warrants issued Accrued lease payable current. Accrued lease payable Lease payable Document Type Document Type Represents information pertaining to Side Letter Agreement With Samsung. Side Letter Agreement With Samsung [Member] Side Letter Agreement With Samsung Cash and Cash Equivalents, Policy [Policy Text Block] Cash and cash equivalents Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Liabilities and Equity [Abstract] Liabilities and Stockholders' Deficit The amount of intrinsic value of warrants outstanding and exercisable. Class of Warrants or Rights, Outstanding and Exercisable, Aggregate Intrinsic Value Aggregate intrinsic value outstanding and exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period Forfeited, expired, and cancelled Share-Based Payment Arrangement, Option [Member] Stock Options Subsequent Event [Member] Subsequent Events Operating loss Operating Income (Loss) Operating (loss) gain Schedule of Segment Reporting Information, by Segment [Table] Asset Class [Domain] Entity File Number Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Schedule of the minimum (base rental) lease payments Location, Statement of Income, Balance [Axis] Retained Earnings [Member] Accumulated deficit Interest Payable, Current Accrued interest on convertible notes Entity Registrant Name Summary of Significant Accounting Policies Selling, General and Administrative Expense Selling, General and Administrative Expense, Total Entity Address, Address Line One Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract] Additional Information The number of shares of stock issued during the period in the non cash exercise of warrants. Stock Issued During Period Non Cash Shares Warrant Exercised Cashless exercise of warrants, shares The amount of long term debt debt including accrued interest. Long Term Debt Including Accrued Interest Convertible notes payable, net Convertible notes payable Subsidiary, Sale of Stock [Line Items] Equity Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Stock option exercises (in shares) Exercised Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Options outstanding and exercisable (in dollars per share) Share Price Threshold Consecutive Trading Days Share Price, Threshold Consecutive Trading Days Pricing period (in days) Assets, Current Total current assets Fair Value, Recurring and Nonrecurring [Table] Segments [Axis] Loss Contingencies [Line Items] Commitments and Contingencies Supplemental Cash Flow Information [Abstract] Supplemental disclosure: Entity Small Business Private Placement Through Placement Agent [Member] Private Placement Through Placement Agent [Member] Private placement through placement agent Future cash outflow to pay for dividends on convertible preferred stock that have been declared but not yet paid. Dividends On Convertible Preferred Stock Incurred But Not Yet Paid'. Accrued dividends on Series C and D convertible preferred stock Long-Term Debt, Type [Axis] Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Consolidation Items [Domain] Employee-related Liabilities, Current Compensation and related expense Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share Represents information relating to restricted shares unit and performance share unit Restricted Shares Unit And Performance Share Unit [Member] RSU and PSU Loss per share: (Loss) Income per Share Long Term Convertible Note April Two Twenty Twenty One Note [Member] Long Term Convertible Note April Two Twenty Twenty One Note [Member] Long-term Convertible Note - April 2, 2021 Note Share-Based Payment Arrangement, Option, Activity [Table Text Block] Schedule of stock option activity Litigation Settlement, Loss Legal settlement loss The number of warrants exercised in the noncash transactions. 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Class of Warrants or Rights, Outstanding and exercisable, Weighted Average Exercise Price Warrants outstanding and exercisable (in dollars per share) Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities: Amortization of Debt Discount (Premium) Amortization of discount on convertible notes Amortization of discount on convertible notes Entity Tax Identification Number Stock Issued During Period, Shares, Conversion of Convertible Securities Issuance of stock for convertible note repayment (in shares) Treasury Stock, Common, Shares Ending balance treasury stock (shares) Beginning balance treasury stock (shares) Treasury stock, shares Equity Component [Domain] Percentage of Share Commitment Fee Percentage Of Share Commitment Fee Percentage of share commitment fee Entity Address, City or Town Stock issued for private offerings Stock Issued During Period, Value, New Issues Stock issued for tender offer Represents information pertaining to long term convertible note april 2 2021 and long term convertible note issued 23 april 2021 extensions. Long Term Convertible Note April 2 2021 And Long Term Convertible Note Issued 23 April 2021 Extensions [Member] April 2, 2021 Note and April 23, 2021 Note Extensions Segments [Domain] Entity Common Stock, Shares Outstanding Number of warrants granted during the period. Class of Warrants or Rights, Granted Granted Lessee, Operating Lease, Liability, to be Paid, after Rolling Year Three Lessee, Operating Lease, Liability, to be Paid, after Rolling Year Three Thereafter Represents information pertaining to long-term convertible note - April 23, 2021 note. Long-term Convertible Note - April 23 2021 Note [Member] Long-term Convertible Note - April 23, 2021 Note Antidilutive Security, Excluded EPS Calculation [Table] Measurement Basis [Axis] Weighted average common shares used in calculation of loss income per share: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Statement [Table] Statement [Table] Share-Based Payment Arrangement, Expense Stock-based compensation expense Loss before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (Loss) gain before income taxes Entity Shell Company Net Cash Provided by (Used in) Investing Activities Net cash provided by/used in investing activities Statement [Line Items] Statement [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value Measurement Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period PSUs vested Maximum [Member] Maximum Series C and D convertible preferred stock [Member] Series C and D convertible preferred stock [Member] Series C and D convertible preferred stock Convertible Instruments and Accrued Interest Sale of Stock [Domain] Exercise price per share or per unit of warrants or rights outstanding when exercised on a cashless basis. Class Of Warrant Or Right Exercise Price Of Warrants Or Rights, Cashless Exercise Cashless exercise of warrants, exercise price Represents information pertaining to single reportable segment. Single Reportable Segment [Member] Single reporting segment Investment Income, Interest Interest income Share Price Threshold Percentage of Intraday Volume Weighted Average Price Share Price, Threshold Percentage Of Intraday Volume Weighted Average Price Percentage of intraday VWAP Debt Conversion, Converted Instrument, Amount Issuance of common stock for interest on convertible notes Dividends Payable, Current Accrued dividends Accrued dividends on convertible preferred stock The number of shares issued during the period due to the exercise of warrants. Stock Issued During Period, Shares, Warrants Exercised Warrant exercises (in shares) Automatically increase in shares Percentage Of Increase In Shares Issued On Proportion Of Outstanding Capital Stock On Last Day Of Each Fiscal Year Percentage Of Increase In Shares Issued On Proportion Of Outstanding Capital Stock On Last Day Of Each Fiscal Year Annual increase in shares authorized, as a percent of outstanding shares Subsequent Events Asset Class [Axis] Convertible Debt, Current Current portion of long-term convertible notes payable Earnings Per Share, Basic [Abstract] Numerator: Assets, Current [Abstract] Current assets: n/a Accrued Liabilities and Compensation Sale of Stock, Consideration Received on Transaction Consideration received from sale of stock Convertible notes payable Convertible Debt, Noncurrent Document Fiscal Year Focus Common Stock, Shares, Outstanding Common stock, shares outstanding Obligations, Fair Value Disclosure Common stock The amount of gain (loss) incurred on derivatives. Gain (Loss) on Derivatives Loss on derivatives Amount of clinical expenses returned to the company. Return Of Clinical Expenses Return of Clinical expenses Number Of Reportable Segments Not Disclosed Flag. Number of reportable segments not disclosed Convertible Debt [Table Text Block] Schedule of changes to outstanding balance of convertible notes, including accrued interest Weighted average exercise price of warrant or rights exercised. Class of Warrants or Rights, Exercised, Weighted Average Exercise Price Exercised (in dollars per share) Award Type [Domain] Operating leases Non-current operating lease liability Operating Lease, Liability, Noncurrent Earnings Per Share, Basic, Other Disclosure [Abstract] Denominator: Tabular disclosure of exercise of warrants. Schedule Of Warrants [Table Text Block] Schedule of warrant activity Lessee, Operating Lease, Liability, to be Paid Total operating lease payments Tabular disclosure of outstanding convertible notes Summary Of Outstanding Convertible Notes [Table Text Block] Summary of key terms of the outstanding convertible notes Series D Preferred Stock [Member] Series D Convertible Preferred Stock New Accounting Pronouncements, Policy [Policy Text Block] Recent Accounting Pronouncements Number of warrants exercised during the reporting period. Class of Warrants or Rights, Exercised Exercised Class of Warrant or Right, Exercise Price of Warrants or Rights Class of warrants, exercise price Entity Address, State or Province The fair market value of shares of the entity's stock exchanged in repayment of debt. Debt Conversion, Fair Market Value Of Shares Exchanged For Repayment Fair market value of shares exchanged for repayment Gain Loss On Legal Settlement Revaluation Gain (Loss) On Legal Settlement Revaluation Legal settlement revaluation Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Expected to be recognized over weighted-average period Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Number of shares Number of Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Number of shares authorized for issuance Operating Lease, Right-of-Use Asset Right-of-use asset Amendment Flag Loss Contingencies [Table] Series C and Series D convertible preferred stock [Member] Series C and Series D Convertible Preferred Stock. Series C and Series D Convertible Preferred Stock Share-Based Payment Arrangement [Text Block] Equity Incentive Plan Weighted average exercise price of warrants or rights outstanding. Class of Warrants or Rights, Outstanding, Weighted Average Exercise Price Outstanding at the end of the year (in dollars per share) Outstanding at the beginning of the year (in dollars per share) Amount of issuance costs for private placement of shares and warrants operating activities. Issuance Costs For Private Placement Of Shares And Warrants Operating Activities Issuance costs for private placement of shares and warrants through placement agent Issuance costs for private placement of shares and warrants through placement agent (Note 5) Debt Instrument [Axis] Interest Expense, Debt, Excluding Amortization Interest on convertible notes Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Total cash and restricted cash City Area Code 2029 Lessee, Operating Lease, Liability, to be Paid, Rolling Year Two Accrued license fees current. License fees License fees Preferred Stock [Member] Preferred stock Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Estimated Litigation Liability, Current Legal settlement Legal settlement accrued Organization Proceeds from Issuance of Common Stock Gross proceeds Expenses: Operating Expenses [Abstract] Operating expenses: Common Stock, Par or Stated Value Per Share Common stock, par value Prepaid service fees current. Prepaid Service Fees Current Prepaid service fees Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Weighted average remaining contractual life in years exercisable Amount of decrease in additional paid in capital (APIC) resulting from accrued preferred stock dividend. Adjustment to Additional Paid in Capital, Accrued Preferred Stock Dividends Dividends accrued on Series C and D convertible preferred stock Threshold Number of Consecutive Trading Days for Payment of Minimum Amount of Advance Threshold Number Of Consecutive Trading Days For Payment Of Minimum Amount Of Advance Threshold trading days for payment of minimum amount of advance Liabilities, Current Total current liabilities Noncash Investing and Financing Items [Abstract] Non-cash investing and financing transactions: Information pertaining to other than options. Equity Instruments Equity Instruments Segment Reporting Disclosure [Text Block] Segment Information Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock Preferred stock conversions Subsequent Event [Table] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period PSUs granted Entity Emerging Growth Company Additional Paid-in Capital [Member] Additional paid-in capital Deferred Costs Cash and non-cash issuance costs Cash Equivalent, Money Market Fund, Carrying Value Money market fund value Plan Name [Domain] Target level percentage Payout percentage Performance target level percentage for non-vested equity-based payment instruments. Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Performance Target, Percentage Other Liabilities, Noncurrent Other liabilities (Note 10) Share-Based Payment Arrangement, Tranche One [Member] Tranche One Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] [Default] US Treasury Securities [Member] U.S. treasuries Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value Aggregate intrinsic value in exercised Private Placement to Accredited Investor [Member] Private Placement To Accredited Investor [Member] Private placement to accredited investor Document and Entity Information Preferred Stock, Amount of Preferred Dividends in Arrears Undeclared dividends Operating Lease, Weighted Average Remaining Lease Term Weighted average remaining lease term Long-Term Debt, Type [Domain] The amount of loss on induced conversion of debt. Loss on Induced Conversion of Debt Loss on induced conversion Loss on induced conversion Share-Based Payment Arrangement, Noncash Expense, Total Share-Based Payment Arrangement, Noncash Expense Stock-based compensation Additional Paid in Capital Additional paid-in capital 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] Fair Value Measurement Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Basic net loss applicable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Entity Filer Category Debt Instrument, Name [Domain] Interest Expense, Operating and Nonoperating [Abstract] Interest and other income (expense): Shares, Outstanding Ending balance (shares) Beginning balance (shares) Segment Information Entity Address, Postal Zip Code Consolidated Balance Sheets Local Phone Number