STOCKHOLDERS' EQUITY | 8. STOCKHOLDERS’ EQUITY Preferred Stock The Company is currently authorized to issue up to 10 million shares of preferred stock, $0.0001, par value per share. There were no shares of preferred stock outstanding at March 31, 2024 and December 31, 2023. Common Stock As of March 31, 2024 and December 31, 2023, the Company was authorized to issue 300,000,000 shares of its common stock, $0.0001 par value per share, and 231,769,765 and 226,063,032 shares of common stock were outstanding as of March 31, 2024 and December 31, 2023, respectively. After giving effect to the 33,596,877 shares reserved for outstanding warrants and awards issued or reserved for future issuance under the Company’s equity incentive plans, as of March 31, 2024 there were 34,633,358 shares of common stock available for issuance. Warrants On January 10, 2024, a former noteholder of the Company exercised a warrant to purchase 4 million shares of the Company’s common stock on a cashless basis and the Company issued 1,977,514 shares of common stock to this noteholder. On March 8, 2024 Hayfin and its affiliates exercised warrants to purchase an aggregate of 3,388,681 shares of the Company’s common stock on a cashless basis and the Company issued 2,482,205 shares of common stock to Hayfin and its affiliates. On March 14, 2024 an entity associated with another former noteholder of the Company exercised a warrant to purchase 169,651 shares of the Company’s common stock on a cashless basis and the Company issued 85,784 shares of common stock to this entity. On February 24, 2024, a warrant to purchase 34,800 shares of the Company’s common stock held by a former noteholder of the Company expired in accordance with its terms. At March 31, 2024 and December 31, 2023, the Company had outstanding warrants to purchase an aggregate of 4,909,774 and 12,502,906 shares, respectively, of common stock, with weighted-average exercise prices of $2.51 and $2.32 per share, respectively, with expiration dates ranging between October 2024 and May 2030. The following table summarizes information about warrants outstanding for the three months ended March 31, 2024: Shares Weighted Average Exercise Price Warrants outstanding at December 31 2023 12,502,906 $ 2.32 Expired (34,800 ) $ 7.50 Granted - $ - Exercised (7,558,332 ) $ 2.16 Warrants outstanding at March 31 2024 4,909,774 $ 2.51 Equity Incentive Plans The fair value of stock options granted under the Company’s equity incentive plans was determined on the date of grant using the Black-Scholes option valuation model. The Black-Scholes model was developed for use in estimating the fair value of publicly traded options, which have no vesting restrictions and are fully transferable. In addition, option valuation models require the input of certain subjective assumptions including the expected stock price volatility. The stock options granted to employees and directors have characteristics significantly different from those of traded options, and changes in the subjective input assumptions can materially affect the fair value estimate. The following assumptions were used to determine the fair value of options granted during the three months ended March 31, 2024 and 2023: Three Months Ended March 31, 2024 2023 Expected term 5.5 - 6.3 years 5.5 - 6.3 years Volatility 66% 68% Dividend yield 0.0 0.0 Risk-free interest rate 4.29% 4.20-4.24% During the three months ended March 31, 2024 and 2023, the Company granted options to purchase an aggregate of 1,096,196 and 1,727,510 shares of common stock, respectively, to its directors and employees. The weighted average remaining contractual life of stock options outstanding and expected to vest at March 31, 2024 is 7.4 years. The weighted average remaining contractual life of stock options exercisable at March 31, 2024 is 6.0 years. During the three months ended March 31, 2024, options to purchase an aggregate of 393,993 shares of common stock were exercised, which included one exercise transaction for which 7,652 shares were withheld to cover the exercise price, and the Company received aggregate net exercise proceeds of $1.0 million. A summary of the Company’s option activity under the Company’s equity incentive plans and related information is as follows: Weighted Average Shares Exercise Price Options outstanding, vested and expected to vest at December 31, 2023 5,906,184 $ 3.38 Forfeited (13,202 ) $ 2.00 Expired (176,434 ) $ 8.48 Granted 1,096,196 $ 5.40 Exercised (393,993 ) $ 2.73 Options outstanding, vested and expected to vest at March 31, 2024 6,418,751 $ 3.63 Options exercisable 3,476,976 $ 3.55 As of March 31, 2024, the Company had $6.9 million of unrecognized compensation expense related to options granted under the Company’s equity incentive plans, which is expected to be recognized over a weighted-average period of 2.9 years. During the three months ended March 31, 2024 and 2023, the Company granted RSUs representing an aggregate of 2,484,968 and 2,666,260 shares, respectively, to certain employees of the Company and to members of its Board of Directors . These RSUs generally vest annually over a period of four years for employees and semi-annually over a period of one year for directors . During the three months ended March 31, 2024 March 31, 2024 A summary of the Company’s unvested RSU activity and related information is as follows: Weighted Average Grant Shares Date Fair Value Balance at December 31, 2023 4,657,297 $ 2.81 Granted 2,484,968 $ 5.40 Vested (1,145,292 ) $ 2.64 Forfeited (102,250 ) $ 2.82 Balance at March 31, 2024 5,894,723 $ 3.94 As of March 31, 2024 Total stock-based compensation expense for all awards granted under the Company’s equity incentive plans for the three months ended March 31, 2024 and 2023 is as follows: Three Months Ended March 31, 2024 2023 Research and development $ 17 $ 5 Plasma center operating expenses 39 23 Selling, general and administrative 1,841 978 Cost of product revenue 244 104 Total stock-based compensation expense $ 2,141 $ 1,110 |