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10. CONVERTIBLE DEBT | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
CONVERTIBLE DEBT | In March and May 2017, we closed a private placement transaction in which we issued to certain accredited investors unregistered senior callable convertible promissory notes, or the Notes, and three-year warrants to purchase an aggregate of 125,000 shares of common stock at an exercise price of $5.52 per share in exchange for aggregate gross proceeds of $6,000,000. The Notes bear interest at a rate of 4% per annum. $5,300,000 in principal was originally scheduled to mature on August 31, 2018 and $700,000 in principal was originally scheduled to mature on November 8, 2018, unless earlier redeemed, repurchased or converted. The Notes are convertible at the option of the holder into common stock at a conversion price of $4.32 per share. Subsequent to September 1, 2017, we may redeem the Notes that are scheduled to mature on August 31, 2018 at any time prior to maturity at a price equal to 100% of the outstanding principal amount of the Notes to be redeemed, plus accrued and unpaid interest as of the redemption date. Prior to November 8, 2018, we may redeem the Notes that are scheduled to mature on such date at any time prior to maturity at a price equal to 100% of the outstanding principal amount of the Notes to be redeemed, plus accrued and unpaid interest as of the redemption date. Interest on the Notes is payable semi-annually in cash on February 28 and August 31 of each year, beginning on August 31, 2017. Interest expense related to the Notes for the years ended December 31, 2020 and 2019 was $40,689 and $200,000, respectively. The warrants were valued at $62,559 using the Black-Scholes pricing model with the following assumptions: expected volatility: 104.06% –111.54%; expected dividend: $0; expected term: 3 years; and risk-free rate: 1.49%–1.59%. We recorded the warrants’ relative fair value of $61,904 as an increase to additional paid-in capital and a discount against the related Notes. The debt discount was amortized over the life of the Notes using the effective interest method. Amortization expense for the years ended December 31, 2020 and 2019, was $0 and $17,534, respectively. In February and March 2018, we extended the maturity date of the Notes— we extended the maturity date to April 1, 2019 for $5,300,000 of principal on the Notes and to June 8, 2019 for the remaining $700,000 Note. No additional consideration was paid or accrued by us. The stated rate of the Notes was unchanged, and the estimated fair value of the new debt approximates its carrying amount (principal plus accrued interest at the date of the modification). We determined that the modification of these Notes is not a substantial modification in accordance with ASC 470-50, “Modifications and Extinguishments.” In May 2018, we offered a noteholder the option to convert its Note at a reduced conversion price of $3.68. The noteholder accepted and converted at such price. Pursuant to the terms of the conversion offer, an aggregate of $700,000 of principal and $5,212 of accrued interest outstanding under the Note were converted into 234,745 shares of common stock. We recognized an induced conversion cost of $57,201 related to the conversion. In December 2018, a noteholder redeemed a note with a principal balance of $300,000 in exchange for $150,000 in cash. We recognized a gain on redemption of convertible note income in the amount of $150,000 as a result of the transaction. On March 30, 2019, the two remaining noteholders agreed to extend the maturity dates of their notes totaling $5,000,000 to April 3, 2020. As part of the extensions, we agreed that if we do not make payment on or before the new maturity dates, after five (5) days written notice, the holders will have the right, but not the obligation, to convert the notes into our common shares at a conversion price of $0.88 per share or a total of 5,681,818 shares. All other provisions of the notes remain unchanged. We determined that the modification of these Notes is not a substantial modification in accordance with ASC 470-50, “Modifications and Extinguishments.” In March 2020, convertible notes with a principal balance of $4,500,000 were converted into 1,041,667 shares of our common stock at a conversion price of $4.32 per share and the remaining outstanding balance of $500,000 was repaid in the form of cash. With respect to the 125,000 warrants issued as part of the convertible note transaction, 100,000 warrants expired in March 2020. In March 2020, 10,417, warrants were exercised, and 14,583 warrants expired in May 2020. Convertible notes consist of the following at:
|  | December 31, 2020 |  |  | December 31, 2019 |
Convertible notes |  | $ | - |  |  | $ | 5,000,000 |
Initial discount |  |  | - |  |  |  | (53,873 | )
Accumulated amortization |  |  | - |  |  |  | 53,873 |
Convertible notes, net |  | $ | - |  |  | $ | 5,000,000 |

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