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Equity Financing
 9 Months Ended
Sep. 30, 2022
Equity [Abstract]  
Equity Financing

11. Equity Financing

Private Placements

In January 2021, the Company issued in a private placement offering (the “January 2021 Private Placement”) pursuant to a securities purchase agreement (“January 2021 Purchase Agreement”) (i) 7,876,784 shares of its common stock, and (ii) warrants to purchase up to 3,938,392 shares of common stock at an exercise price of $3.13 per share (the “January 2021 Warrants”) and raised total gross proceeds of $25.1 million. The January 2021 Warrants are exercisable at any time at the option of the holder and expire 5.5 years from the date of issuance. In connection with the January 2021 Private Placement, the Company granted to a placement agent warrants to purchase a total of 393,839 shares of Common Stock (the “January 2021 Placement Agent Warrants”) that have an exercise price per share equal to $3.99 and a term of 5.5 years from the date of issuance.

The common stock warrants are classified as a liability within Level 3 due to a contingent cash payment feature. The Company utilized a Black Scholes Merton model on January 28, 2021 with the following assumptions: volatility of 123.8%, stock price of $2.88 and risk-free rate of 0.5%. The estimated fair value of the common stock warrant liability was subsequently remeasured at December 31, 2021 with the changes recorded on the Company’s consolidated statements of operations and comprehensive loss.

The January 2021 Placement Agent Warrants were issued for services performed by the placement agent as part of the January 2021 Private Placement and were treated as offering costs. The value of the January 2021 Placement Agent Warrants was determined to be $942,000, calculated using a Black-Scholes Model. The Company incurred additional offering costs totaling $1.9 million that consist of direct incremental legal, advisory, accounting and filing fees relating to the January 2021 Private Placement. The offering costs, inclusive of the January 2021 Placement Agent Warrants, totaled $2.8 million and allocated to the common stock warrant liability and the common stock using their relative fair values. A total of $769,000 was allocated to the common stock warrant liability and expensed and the remaining $2.0 million was allocated to the common stock and offset to additional paid in capital.

In March 2018, the Company issued in a private placement offering (the “March 2018 Private Placement”) pursuant to a securities purchase agreement (“March 2018 Purchase Agreement”) (i) 300,752 shares of its common stock and (ii) warrants to purchase up to 300,752 shares of common stock at an initial exercise price equal to $45.75 (the “March 2018 Warrants”) and raised total gross proceeds of $10.0 million. The March 2018 Warrants are exercisable at any time at the option of the holder and expire five years from the date of issuance. In connection with the March 2018 Private Placement, the Company granted to a placement agent warrants to purchase a total of 15,038 shares of Common Stock (the “March 2018 Placement Agent Warrants”) that have an exercise price per share equal to $41.5625 and a term of five years from the date of issuance.

The number of shares of common stock and the number and exercise price of the March 2018 Warrants issued in the March 2018 Private Placement were subject to adjustments as provided in the March 2018 Purchase Agreement. Following the adjustments as provided in the March 2018 Purchase Agreement, the number of shares issued to the purchasers was 1,201,634, the total number of shares issuable upon exercise of the March 2018 Warrants was 1,282,832 and the per share exercise price of the March 2018 Warrants was $10.7258.

Registered Direct Offerings

On May 11, 2018, the Company filed a shelf Registration Statement on Form S-3 with the SEC which was declared effective on June 8, 2018 (“2018 Shelf Registration Statement”). On April 21, 2022, the Company filed a shelf Registration Statement on Form S-3 with the SEC which was declared effective on May 12, 2022 (“2022 Shelf Registration Statement”). Each of the 2018 Shelf Registration Statement and the 2022 Shelf Registration Statement allows the Company to sell any combination of common stock, preferred stock, warrants and units consisting of such securities in one or more offerings from time to time having aggregate offering prices of up to $50.0 million. The Company ceased being able to use the 2018 Shelf Registration Statement after June 8, 2021, the three-year anniversary of its effective date. The 2022 Shelf Registration Statement may no longer be used after May 12, 2025, the three-year anniversary of its effective date.

In August 2022, the Company entered into a securities purchase agreement (the “August 2022 Purchase Agreement”) pursuant to which it sold (i) 2,450,000 registered shares of its common stock, pursuant to the 2022 Shelf Registration Statement, (ii) pre-funded common stock purchase warrants (the “Pre-Funded Warrants”) to purchase up to 2,272,506 shares of common stock, at an exercise price of $0.0001 per share, which Pre-Funded Warrants were registered under the 2022 Shelf Registration Statement, and (iii) unregistered preferred investment options (the "August 2022 Options") to purchase up to 4,722,506 shares of common stock, at an exercise price of $0.93376 per share, in a private placement, for total gross proceeds of $5.0 million (the “August 2022 Registered Direct Offering”). The August 2022 Registered Direct Offering closed on August 16, 2022. The August 2022 Pre-Funded Warrants became exercisable upon issuance and are exercisable until exercised in full. The August 2022 Options became exercisable upon issuance and expire 5 years after the date of issuance. In connection with the August 2022 Registered Direct Offering, the Company granted to a placement agent preferred investment options ("August 2022 Placement Agent Options") to purchase a total of 236,125 shares of common stock that have an exercise price per share equal to $1.32 and a term of five years.

The August 2022 Options and August 2022 Placement Agent Options are classified as liabilities within Level 3 due to a certain early settlement provisions that preclude them from equity classification. The Company utilized a Black-Scholes Merton model on August 16, 2022 with the following assumptions: volatility of 128.46%, stock price of $0.94, risk-free rate of 2.97% and a term of 5 years. The estimated fair value of the common stock option liabilities was subsequently remeasured at September 30, 2022 with the changes recorded on the Company’s consolidated statements of operations and comprehensive loss.

The August 2022 Placement Agent Options were issued for services performed by the placement agent as part of the August 2022 Registered Direct Offering and were treated as offering costs. The value of the August 2022 Placement Agent Options was determined to be $191,000, calculated using a Black-Scholes Model. The Company incurred additional offering costs totaling $488,000 that consist of direct incremental legal, advisory, accounting and filing fees relating to the August 2022 Registered Direct Offering. The offering costs, inclusive of the August 2022 Placement Agent Options, totaled $679,000 and were allocated to the common stock option liabilities, the common stock and Pre-Funded Warrants using their relative fair values. A total of $314,000 was allocated to the common stock option liabilities and expensed while the remaining $365,000 was allocated to the common stock and Pre-Funded Warrants and offset to additional paid in capital.

In December 2020, the Company entered into a securities purchase agreement (the “December 2020 Purchase Agreement”) pursuant to which it sold (i) 2,618,658 registered shares of its common stock pursuant to the 2018 Shelf Registration Statement and (ii) unregistered warrants to purchase 2,618,658 shares of its common stock (the “December 2020 Warrants”) in a private placement, for total gross proceeds of $8.0 million (the “December 2020 Registered Direct Offering”). The December 2020 Registered Direct Offering closed on December 22, 2020. The December 2020 Warrants have an exercise price of $3.00 per share, became exercisable upon issuance and expire 5.5 years after the date of issuance. In connection with the December 2020 Registered Direct Offering, the Company granted to a placement agent warrants to purchase a total of 130,933 shares of common stock (“December 2020 Placement Agent Warrants”) that have an exercise price per share equal to $3.8188 and a term of five years.

In September 2019, the Company entered into a securities purchase agreement (the “September 2019 Purchase Agreement”) pursuant to which it sold (i) 1,318,828 registered shares of its common stock pursuant to the 2018 Shelf Registration Statement and (ii) unregistered warrants to purchase 659,414 shares of its common stock (the “September 2019 Warrants”) in a private placement, for total gross proceeds of $10.0 million (the “September 2019 Registered Direct Offering”). The September 2019 Registered Direct Offering closed on September 5, 2019. The September 2019 Warrants have an exercise price of $7.52 per share, became exercisable upon issuance and expire 5.5 years after the date of issuance. In connection with the September 2019 Registered Direct Offering, the Company granted to a placement agent warrants to purchase a total of 65,942 shares of common stock (“September 2019 Placement Agent Warrants”) that have an exercise price per share equal to $9.4781 and a term of five years.

In June 2019, the Company entered into a securities purchase agreement (the “June 2019 Purchase Agreement”) pursuant to which it sold (i) 1,489,575 registered shares of its common stock pursuant to the 2018 Shelf Registration Statement and (ii) unregistered warrants to purchase 1,489,575 shares of its common stock (the “June 2019 Warrants”) in a private placement, for total gross proceeds of $7.5 million (the “June 2019 Registered Direct Offering”). The June 2019 Registered Direct Offering closed on June 14, 2019. The June 2019 Warrants have an exercise price of $5.00 per share, became exercisable upon issuance and expire 5.5 years after the date of issuance. In connection with the June 2019 Registered Direct Offering, the Company granted to a placement agent warrants to purchase a total of 74,479 shares of common stock (“June 2019 Placement Agent Warrants”) that have an exercise price per share equal to $6.2938 and a term of five years.

In June 2018, the Company entered into a securities purchase agreement (the “June 2018 Purchase Agreement”) pursuant to which it sold (i) 1,392,345 registered shares of its common stock pursuant to the 2018 Shelf Registration Statement and (ii) unregistered warrants to purchase 1,392,345 shares of its common stock (the “June 2018 Warrants”) in a private placement, for total gross proceeds of $14.0 million (the “June 2018 Registered Direct Offering”). The June 2018 Registered Direct Offering closed on June 14, 2018. The June 2018 Warrants have an exercise price of $9.94 per share, became exercisable upon issuance and expire 5.5 years after the date of issuance. In connection with the June 2018 Registered Direct Offering, the Company granted to a placement agent warrants to purchase a total of 69,617 shares of common stock (“June 2018 Placement Agent Warrants”) that have an exercise price per share equal to $12.568 and a term of five years.