Stock-Based Compensation	6 Months Ended
Stock-Based Compensation	Jun. 30, 2022
Stock-Based Compensation [Abstract]
Stock-Based Compensation	11. Stock-Based Compensation 2021 Omnibus Incentive Compensation Plan In November 2021, the Company established the 2021 Omnibus Incentive Compensation Plan (the “Plan”), which provides for the Company to grant nonqualified stock options, incentive (qualified) stock options, stock appreciation rights, restricted share awards, restricted stock units, performance awards, cash incentive awards and other equity-based awards (including fully vested shares). The maximum number of shares of common stock that can be issued under the Plan is 8,700,000 Class A shares. This number increases automatically on January 1 of each year, commencing January 1, 2023, by the number of shares equal to the lesser of (i) 4 % of the outstanding shares of our common stock on the immediately preceding December 31, (ii) the number of shares determined by the Compensation Committee, if any such determination is made, and (iii) the number of shares underlying any awards granted during the preceding calendar year, net of the shares underlying awards canceled or forfeited under the Plan. Stock Options As of June 30, 2022 there were options for 13,977,406 shares of Class A stock outstanding and options for 6,362,455 shares of Class B stock outstanding, of which 8,748,337 Class A and 4,921,089 Class B shares were exercisable, respectively. As of June 30, 2022, the maximum number of stock options awards available for future issuance under the Company’s plans is 6,328,932 . The following table summarizes stock option activity during the six months ended June 30, 2022: The aggregate intrinsic value of options is calculated as the difference between the exercise price of the options and the fair value of the common stock for those options that had exercise prices lower than the fair value of the common stock as of June 30, 2022. The intrinsic value of options exercised during the six months ended June 30, 2022 was $ 4.4 million. The weighted-average grant-date fair value per share of options granted during the six months ended June 30, 2022 was $ 2.42 . Restricted Stock The following table summarizes the Company’s restricted stock activity for the six months ended June 30, 2022: Stock-based compensation expense recognized on restricted stock was less than $ 0.1 million for the six months ended June 30, 2022. Stock-Based Compensation Expense The Company recorded stock-based compensation expense in the following expense categories in the accompanying unaudited condensed consolidated statements of operations (in thousands): As of June 30, 2022, total unrecognized compensation cost related to the unvested stock-based awards was $ 21.1 million, which is expected to be recognized over a weighted average period of 2.7 years. Number of Stock Options Outstanding Weighted Price Per Share Weighted Contractual Term (years) Aggregate Intrinsic Value (in thousands) Balance at December 31, 2021 21,387,909 $ 5.25 7.4 $ 49,684 Granted 1,024,221 3.26 Exercised (1,013,541) (3.40) Forfeited (1,058,728) (7.36) Balance at June 30, 2022 20,339,861 $ 5.12 7.3 $ 8,648 Options vested and exercisable at June 30, 2022 13,669,426 $ 4.50 6.9 $ 7,879 Number of Shares Weighted Average Grant Date Fair Value Per Share Unvested at December 31, 2021 — $ — Issued 300,000 3.76 Unvested at June 30, 2022 300,000 $ 3.76 Three Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 General and administrative $ 1,008 $ 597 $ 2,379 $ 3,867 Research and development 818 205 1,625 375 Total stock-based compensation expense $ 1,826 $ 802 $ 4,004 $ 4,242