NOTE 7—NOTES PAYABLE

Notes payable consisted of the following at December 31, 2021 and 2020 (in thousands except for conversion price and shares):

The weighted-average stated interest rate of notes payable was 6% and 10%, respectively, for the years ended December 31, 2021 and 2020. The weighted-average effective interest rate of notes payable for the years ended December 31, 2021 and 2020 was 15% and 37%, respectively, after giving effect to discounts relating to warrants, conversion features and deferred financing cost in connection with these notes.

As of December 31, 2021, future contractual principal payments due on notes payable were as follows (in thousands):

In March 2021, the Company prepaid in full $6.2 million principal amount of outstanding Amended and Restated 10% Senior Secured Convertible Debentures and recognized $1.2 million of loss on debt extinguishment due to recognition of the remaining unamortized discount.

The conversion feature of the Amended and Restated 10% Senior Secured Convertible Debentures was separately accounted for at fair value as derivative liabilities under guidance in ASC 815 that is remeasured at fair value on a recurring basis using Level 3 inputs, with any changes in the fair value of the conversion feature liabilities recorded in earnings. Upon prepayment of the Debentures, the outstanding liability was recognized in change in fair value in earnings. The following table sets forth the fair value of the conversion feature liabilities as of December 31, 2021 and 2020 (in thousands):

The fair value and any changes in fair value of conversion feature liabilities are determined using a binominal lattice model. The model produces an estimated fair value based on changes in the price of the underlying common stock.

The fair values as of December 31, 2020 was based upon following assumptions:

The Company is party to a revolving line of credit agreement with Dr. Niihara, the Company’s Chairman and Chief Executive Officer. Under the agreement, at the Company’s request from time to time, Dr. Niihara may, but is not obligated to, loan or re-loan to the Company up to $1,000,000. Outstanding amounts under the agreement are due and payable upon demand and bear interest, payable monthly, at a variable annual rate equal to the Prime Rate in effect from time to time plus 3%. In addition to the payment of interest, the Company is obligated to pay Dr. Niihara a “tax gross-up” intended to make him whole for federal and state income taxes payable by him with respect to interest paid to him in the previous year. As of December 31, 2021, and 2020, the outstanding balances of $400,000 and $800,000 were reflected in revolving line of credit, related party on the consolidated balance sheet. With the tax-gross up, the effective interest rate on the outstanding balance as of December 31, 2021 and 2020 was 10.4%. The revolving line of credit agreement will expire on November 22, 2022. Refer to Note 12 and Note 14 for more related party information.

On May 8, 2020, the Company received a loan in the amount of $797,840 under the Small Business Administration Paycheck Protection Program (“PPP”). The PPP, established as part of the Coronavirus Aid, Relief and Economic Security Act (“CARES Act”), provides for loans to qualifying businesses for amounts up to 2.5 times of the average monthly payroll expenses of the qualifying business. The loan, which is in the form of a Promissory Note dated April 29, 2020, matures on April 29, 2022 and bears interest at a rate of 1% per annum, payable monthly commencing on December 8, 2020 unless the PPP loan is forgiven prior to the date of the first monthly payment or the loan forgiveness process has commenced. The Note may be prepaid by the Company at any time prior to maturity with no prepayment penalties. The loan and accrued interest were forgivable after a specific period as long as the Company used the loan proceeds for eligible purposes, including payroll, benefits, rent and utilities, and maintains its payroll levels. The Company applied for loan forgiveness and during year ended December 31, 2021, the loan was forgiven and the

Company recognized a gain on forgiveness of debt of $806,816 included in loss on debt extinguishment in the consolidated statements of operations. The PPP loan amount was included in notes payable on the consolidated balance sheet at December 31, 2020.

On February 9, 2021, the Company entered into a securities purchase agreement pursuant to which the Company agreed to sell and issue to the purchasers thereunder in a private placement pursuant to Rule 4(a)(2) of the Securities Act of 1933, as amended, and Regulation D thereunder a total of up to $17 million in principal amount of convertible promissory notes of the Company for a purchase price equal to the principal amount thereof. The Company sold and issued approximately $14.5 million of the convertible promissory notes. Of the net proceeds from the sale of the convertible promissory notes, $6.2 million was used to prepay the outstanding Amended and Restated 10% Senior Secured Convertible Debentures as described above.

Commencing one year from the original issue date, the convertible promissory notes will be convertible at the option of the holder into shares of the Company’s common stock at an initial conversion price of $1.48 per share, which equaled the “Average VWAP” (as defined) of the Company’s common stock on the effective date. The initial conversion price will be adjusted as of the end of each three-month period following the original issue date, commencing May 31, 2021, to equal the Average VWAP as of the end of such three-month period if such Average VWAP is less than the then-conversion price. There is no floor on the conversion price. The conversion price will be subject to further adjustment in the event of a stock split, reverse stock split or certain other events specified in the convertible promissory notes.

The convertible promissory notes bear interest at the rate of 2% per year, payable semi-annually on the last business day of August and January of each year and will mature on the 3rd anniversary of the original issue date. The convertible promissory notes will become prepayable in whole or in part at the election of the holders on or after February 28, 2022 if the Company’s common stock shall not have been approved for listing on the NYSE American, the Nasdaq Capital Market or other “Trading Market” (as defined). The Company will be entitled to prepay up to 50% of the principal amount of the convertible promissory notes at any time after the first anniversary and on or before the second anniversary of the original issue date for a prepayment amount equal to the principal amount being prepaid, accrued and unpaid interest thereon and a prepayment premium equal to 50% of such principal amount. The convertible promissory notes are general, unsecured obligations of the Company.

The conversion feature of the convertible promissory notes was separately accounted for at fair value as a derivative liability under guidance in ASC 815 that is remeasured at fair value on a recurring basis using Level 3 inputs, with any changes in the fair value of the conversion feature liability recorded in earnings. The following table sets forth the fair value of the conversion feature liability as of December 31, 2021 (in thousands):

The fair value and any change in fair value of conversion feature liability are determined using a convertible bond lattice model. The model produces an estimated fair value based on changes in the price of the underlying common stock.

The fair value as of December 31, 2021 and at issuance date was based on upon following assumptions: