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STOCKHOLDERS’ EQUITY
 12 Months Ended
Dec. 31, 2023
Equity [Abstract]  
STOCKHOLDERS’ EQUITY STOCKHOLDERS' EQUITY
 
Common Stock

On July 27, 2023, the Company’s shareholders approved an amendment to the Company’s articles of incorporation that increased the amount of common stock authorized for issuance to 500,000,000 with a par value of 0.0001 per share.

Shelf Registration Statements on Form S-3 and At-the-Market Offering Agreements

In February 2024, we intend to commence a new at-the-market offering program with H.C. Wainwright & Co., LLC (“Wainwright”) acting as sales agent (the “2024 ATM”) pursuant to the ATM Agreement, under which we may offer and sell shares of our common stock from time to time through Wainwright having an aggregate offering price of up to $1.5 billion.

On October 24, 2023, the Company entered into a new at-the-market offering program (the “2023 ATM”) with Wainwright relating to shares of the Company’s common stock. In accordance with the terms of the sales agreement, the Company may offer and sell shares of its common stock having an aggregate offering price of up to $750.0 million from time to time through Wainwright acting as its sales agent. As of December 31, 2023, the Company has sold 19,591,561 shares of common stock for an aggregate purchase price of $248.1 million, net of offering costs, pursuant to the 2023 ATM.

On February 11, 2022, the Company entered into an at-the-market Offering Agreement (the “2022 ATM”), or sales agreement, with Wainwright relating to shares of the Company’s common stock. In accordance with the terms of the sales agreement, the Company may offer and sell shares of its common stock having an aggregate offering price of up to $750.0 million from time to time through Wainwright acting as its sales agent. As of October 23, 2023, the Company has sold 86,822,000 shares of common stock for an aggregate purchase price of $727.9 million, net of offering costs, pursuant to the 2022 ATM, completing the agreement.

Common Stock Warrants

A summary of the Company’s issued and outstanding common stock warrants and changes during the year ended December 31, 2023 and 2022 is as follows:

Number of WarrantsWeighted Average Exercise PriceWeighted Average Remaining Contractual Life (in years)
Outstanding as of December 31, 2021326,779 $25.54 3.5
Forfeited(2,404)52.00 —
Outstanding as of December 31, 2022324,375 25.00 2.5
Outstanding as of December 31, 2023324,375 $25.00 2.5
 
Restricted Stock Units
 
On January 1, 2018, the Board adopted the 2018 Equity Incentive Plan (as amended, the “2018 Plan”), which was subsequently approved by the Company’s shareholders on March 7, 2018, The 2018 Plan provides for the issuance of stock options, restricted stock, restricted stock units, preferred stock and other awards to employees, directors, consultants and other service providers.
The Company has granted restricted stock units (“RSU”) to employees, which generally vest over a four-year period from the date of grant; however, in certain instances, all or a portion of a grant may vest immediately. RSUs granted to directors generally vest over a one-year period or, in certain instances, immediately. The Company measures the fair value of RSUs at the grant date and recognizes expense on a straight-line basis over the requisite service period from the date of grant for each separately-vesting tranche under the graded-vesting attribution method.

A summary of the Company’s RSU activity for the years ended December 31, 2023 and 2022, is as follows:

Number of RSUsWeighted Average Grant Date Fair Value
Nonvested at December 31, 2021642,094 $35.93 
Granted1,167,339 19.35 
Forfeited(60,000)42.19 
Vested(493,785)29.87 
Nonvested at December 31, 20221,255,648 22.60 
Granted6,258,700 8.73 
Forfeited(309,337)9.85 
Vested(1,439,482)17.90 
Nonvested at December 31, 20235,765,529 9.40 

As of December 31, 2023, there was approximately $43.1 million of aggregate unrecognized stock-based compensation related to unvested RSUs that is expected to be recognized over the next 2.5 years.

Series A Preferred Stock

On June 5, 2023, the Company entered into a securities purchase agreement for the offering of 15,000 shares of the Company’s Series A redeemable convertible preferred stock. On June 8, 2023, upon closing of the offering, the Company issued 15,000 shares of Series A Preferred Stock for total gross proceeds of $14.3 million before deducting the placement agent’s fees and other estimated offering expenses. Each share of Series A Preferred Stock had a purchase price of $952.38, representing an original issue discount of approximately 5% of the $1,000 stated value of each share. Each share of Series A Preferred Stock was convertible into shares of the Company’s common stock at an initial conversion price of $14.52 per share, at the option of the holder, at any time following the Company’s receipt of stockholder approval for an increase in its authorized shares of common stock.

The Series A Preferred Stock was recorded outside of stockholder’s equity as mezzanine equity. At June 30, 2023, the Company increased the carrying value of Series A Preferred Stock to its redemption value and recorded the difference to additional paid-in capital.

As of December 31, 2023, all of the outstanding Series A Preferred Stock were redeemed at 105% of the $1,000 stated value per share for $15.8 million.