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Stock-Based Compensation (Summary of Stock Option Activity) (Details)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2020
shares
Number of Options    
Outstanding as of Beginning of period (in shares) 1,473,359  
Granted (in shares) 1,238,426 0
Cancelled / Forfeited (in shares) (42,669)  
Exercised (in shares) (11,783)  
Balance as of End of period (in shares) 2,657,333  
Options exercisable as of September 30, 2021 (in shares) 1,009,785  
Weighted Average Exercise Price    
Outstanding as of Beginning of period (in dollars per share) | $ / shares $ 2.64  
Granted (in dollars per share) | $ / shares 13.00  
Cancelled / Forfeited (in dollars per share) | $ / shares 10.31  
Exercised (in dollars per share) | $ / shares 0.88  
Balance as of End of period (in dollars per share) | $ / shares 7.35  
Options exercisable as of September 30, 2021 (in dollars per share) | $ / shares $ 2.36  
Aggregate Intrinsic Value    
Aggregate intrinsic value | $ $ 25,475  
Options exercisable as of September 30, 2021 | $ $ 14,330  
Weighted average remaining contractual term, outstanding (in years) 8 years 4 months 24 days  
Weighted average remaining contractual life, exercisable (in years) 7 years 3 months 18 days  
Options to purchase common stock    
Number of Options    
Balance as of End of period (in shares) 9,993