Note 11. Warrants

Outstanding Warrants

In connection with the entry into the Third Amendment, Hercules received warrants to purchase an aggregate of 18,724 shares of the Company’s common stock at an exercise price of $55.01 per share, and in connection with the draw down of the Tranche 1C Advance, Hercules received warrants to purchase 9,700 shares of the Company’s common stock at an exercise price of $77.31 per share (collectively, the “2023 warrants”). In connection with the entry into the Second Amendment, Hercules received warrants to purchase an aggregate of 35,255 shares of the Company’s common stock at an exercise price of $31.91 per share (the “2022 warrants”), and in connection with the first advance of the 2020 Term Loan, Hercules received warrants to purchase an aggregate of 15,541 shares of the Company’s common stock at an exercise price of $80.43 per share (the “2020 warrants”).

The 2023 warrants, 2022 warrants and 2020 warrants were priced using the volume weighted average price of the Company’s common stock over the ten-day trading period immediately preceding the initial closing, subject to certain limited adjustments as specified in the warrant. The warrants are exercisable for seven years from the date of issuance. The warrants were classified as a component of stockholders’ equity. The relative fair value of the warrants of approximately $1.6 million for the 2023 warrants, $0.8 million for the 2022 warrants and $0.9 million for the 2020 warrants at the time of issuance, which was determined using the Black-Scholes option-pricing model, was recorded as additional paid-in capital and reduced the carrying value of the debt. Upon full repayment of the Company’s obligations under the Hercules Loan Agreement, no additional warrants are issuable under the Hercules Loan Agreement.