In the 2017 public offering, the Company issued 1,215,000 units, each comprising one share of Common Stock, and one warrant exercisable for one share of Common Stock for $4.74 per share. In addition to the units issued and sold in this 2017 public offering, the Company also issued warrants to the underwriters to purchase up to an aggregate of 85,050 shares of Common Stock at a purchase price of $4.74 per share. On January 22, 2018, the underwriters exercised their over-allotment option with respect to 175,750 warrants to purchase Common Stock at a purchase price of $4.74 per share. In connection with the exercise of the over-allotment option, the Company issued to the underwriters warrants to purchase an aggregate of 1,453 shares of Common Stock at a purchase price of $4.74 per share. The Company determined that each of these warrants should be classified as equity and recorded the fair value of the warrants in additional paid in capital.