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Stock-Based Compensation - Employee and Director Stock Option Activity (Details) - Employees, Directors and Consultants
3 Months Ended
Mar. 31, 2023
$ / shares
shares
Number of Shares  
Beginning balance (in shares) | shares 4,895,522
Granted (in shares) | shares 827,719
Forfeited (in shares) | shares (137,413)
Ending balance (in shares) | shares 5,585,828
Vested (in shares) | shares 2,206,720
Exercisable (in shares) | shares 2,206,720
Weighted Average Exercise Price  
Beginning balance (in dollars per share) | $ / shares $ 3.54
Granted (in dollars per share) | $ / shares 0.36
Forfeited (in dollars per share) | $ / shares 1.29
Ending balance (in dollars per share) | $ / shares 3.12
Vested (in dollars per share) | $ / shares 6.57
Exercisable (in dollars per share) | $ / shares $ 6.57