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Stock-Based Compensation (Summary of Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2022
Number of Options  
Outstanding as of Beginning of period (in shares) 2,749,441
Granted (in shares) 1,062,318
Cancelled / Forfeited (in shares) (240,548)
Exercised (in shares) (119,131)
Balance as of End of period (in shares) 3,452,080
Options exercisable as of June 30, 2022 (in shares) 1,417,978
Weighted Average Exercise Price  
Outstanding as of Beginning of period (in dollars per share) $ 7.93
Granted (in dollars per share) 7.56
Cancelled / Forfeited (in dollars per share) 6.26
Exercised (in dollars per share) 0.62
Balance as of End of period (in dollars per share) 8.18
Options exercisable as of June 30, 2022 (in dollars per share) $ 5.50
Aggregate Intrinsic Value  
Aggregate intrinsic value $ 4,095
Options exercisable as of June 30, 2022 $ 3,435
Weighted average remaining contractual term, outstanding (in years) 8 years
Weighted average remaining contractual life, exercisable (in years) 6 years 9 months 18 days
Options not granted under the 2001 or 2021 Plans  
Number of Options  
Balance as of End of period (in shares) 8,796