Line of Credit - Related Party	6 Months Ended
Jun. 30, 2021
Line of Credit – Related Party	3. Line of Credit – Related Party The Company has a $10 million Line of Credit arrangement with Richard E. Uihlein, Chairman of Board of Directors and a shareholder pursuant to an agreement established in December, 2017 and amended in December, 2018 and January, 2019. Under the arrangement the Company may borrow up to $10 million from Mr. Uihlein on an unsecured basis and with any borrowings bearing interest at the Applicable Federal Rate for short terms loans published by the Internal Revenue Service (0.13% in June 2021). Borrowings may be made through December 31, 2021 with repayment due on December 31, 2022. In connection with the Line of Credit agreement, the Company issued to Mr. Uihlein warrants to purchase 1 million shares of the Company’s common stock for $5 per share. Half of the warrants vested at closing of the Line of Credit and the other half vest ratably with borrowings under the agreement. The 500,000 warrants that vested at closing were exercised in May 2019 for cash proceeds to the Company of $2.5 million. As of the date of this Quarterly Report, there have been no borrowings under the Line of Credit. The fair value of the 500,000 warrants vested at closing in December 2017 was $696,000 at the date of issuance based on the following assumptions: an expected life of 7 years, volatility of 98%, risk free interest rate of 2.05% and zero dividends. The fair value of the vested warrants was recorded in other current assets and other assets (non-current) as a deferred financing cost and were to be amortized on a straight-line basis from December 19, 2017 through December 31, 2019. The remaining unamortized balance of the deferred financing cost on January 11, 2019 was adjusted to be recorded as expense on a straight-line basis through December 31, 2022. Amortization for the six months ended June 30, 2021 and 2020 of $43,000 and $43,000, respectively, was recorded as interest expense. The fair value of warrants that vest in the future based on borrowings will be computed when those borrowings occur and amortized over the remaining period through December 31, 2022 reflecting the second extension.

Line of Credit - Related Party

6 Months Ended

Jun. 30, 2021

3. Line of Credit – Related Party

The Company has a $10 million Line of Credit arrangement with Richard E. Uihlein, Chairman of Board of Directors and a shareholder pursuant to an agreement established in December, 2017 and amended in December, 2018 and January, 2019. Under the arrangement the Company may borrow up to $10 million from Mr. Uihlein on an unsecured basis and with any borrowings bearing interest at the Applicable Federal Rate for short terms loans published by the Internal Revenue Service (0.13% in June 2021). Borrowings may be made through December 31, 2021 with repayment due on December 31, 2022. In connection with the Line of Credit agreement, the Company issued to Mr. Uihlein warrants to purchase 1 million shares of the Company’s common stock for $5 per share. Half of the warrants vested at closing of the Line of Credit and the other half vest ratably with borrowings under the agreement. The 500,000 warrants that vested at closing were exercised in May 2019 for cash proceeds to the Company of $2.5 million. As of the date of this Quarterly Report, there have been no borrowings under the Line of Credit.

The fair value of the 500,000 warrants vested at closing in December 2017 was $696,000 at the date of issuance based on the following assumptions: an expected life of 7 years, volatility of 98%, risk free interest rate of 2.05% and zero dividends. The fair value of the vested warrants was recorded in other current assets and other assets

(non-current)

as a deferred financing cost and were to be amortized on a straight-line basis from December 19, 2017 through December 31, 2019. The remaining unamortized balance of the deferred financing cost on January 11, 2019 was adjusted to be recorded as expense on a straight-line basis through December 31, 2022. Amortization for the six months ended June 30, 2021 and 2020 of $43,000 and $43,000, respectively, was recorded as interest expense. The fair value of warrants that vest in the future based on borrowings will be computed when those borrowings occur and amortized over the remaining period through December 31, 2022 reflecting the second extension.