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Stock-Based Compensation - Summary of Stock Option Activity for Amended 2014 Plan and Related Information (Details) - Amended and Restated Two Thousand Fourteen Stock Incentive Plan - Employee Stock Option
3 Months Ended
Mar. 31, 2022
$ / shares
shares
Number of Shares  
Outstanding beginning balance (in shares) | shares 4,717,602
Granted (in shares) | shares 1,759,692
Exercised (in shares) | shares 0
Canceled/forfeited (in shares) | shares (200,012)
Expired (in shares) | shares 0
Outstanding ending balance (in shares) | shares 6,277,282
Exercisable (in shares) | shares 2,597,775
Weighted Average Exercise Price  
Outstanding beginning balance (in usd per share) | $ / shares $ 1.65
Granted (in usd per share) | $ / shares 1.59
Exercised (in usd per share) | $ / shares 0
Canceled/forfeited (in usd per share) | $ / shares 1.96
Expired (in usd per share) | $ / shares 0
Outstanding ending balance (in usd per share) | $ / shares 1.63
Exercisable (in usd per share) | $ / shares $ 1.45