On May 20, 2019, the Company entered into a securities purchase agreement with Lincoln Park pursuant to which the Company agreed to issue and sell to Lincoln Park a senior convertible promissory note with an initial principal amount of $1,100,000 (the “2019 Lincoln Park Note”) at a purchase price of $1,000,000 (representing an original issue discount of approximately 9.09%), together with warrants to purchase up to 137,500 shares of Common Stock at an exercise price of $2.00 per share and 137,500 additional warrants on each of the second, fourth and sixth month anniversaries of the securities purchase agreement if any of the balance remains outstanding on such dates (the “2019 Lincoln Park Warrants”). As such, on each of July 23, 2019, September 20, 2019, and November 20, 2019, the Company issued warrants to purchase up to 137,500 shares of Common Stock. On January 3, 2020, the exercise price of the 2019 Lincoln Park Warrants was reduced to $0.78 per share. The 2019 Lincoln Park Note is convertible at any time into shares of Common Stock (the “Conversion Shares”) at an initial conversion price equal to the lower of (A) $5.00 per share and (B) the lower of (i) the lowest intraday sale price of the Common Stock on the applicable conversion date and (ii) the average of the three lowest closing sales prices of the Common Stock during the twelve consecutive trading days ending on and including the trading day immediately preceding the conversion date, subject in the case of this clause (B), to a floor of $1.00 per share. Pursuant to a re-pricing clause in the 2019 Lincoln Park Note, the $5.00 fixed conversion price was reduced to $0.78, the purchase price used in the Company’s public offering that closed on October 21, 2019. Outstanding principal under the 2019 Lincoln Park Note will not accrue interest, except upon an event of default, in which case interest at a default rate of 18% per annum would accrue until such event of default is cured. The 2019 Lincoln Park Note matures on May 21, 2021 and can be paid prior to the maturity date without any penalty.