Quarterly report pursuant to Section 13 or 15(d)

Equity Incentive Plan - Summary of Stock Option Activity and Related Information (Details)

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Equity Incentive Plan - Summary of Stock Option Activity and Related Information (Details) - 2013 Equity Incentive Plan - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Stock Options    
Outstanding at December 31, 2020 391,650  
Granted 81,821  
Exercised (in shares) (17,534)  
Outstanding at September 30, 2021 455,937 391,650
Exercisable at September 30, 2021 371,901  
Weighted Average Exercise Price    
Outstanding at December 31, 2020 (in dollars per share) $ 5.70  
Granted 11.61  
Exercised (in dollars per share) 3.79  
Outstanding at September 30, 2021 6.83 $ 5.70
Exercisable at September 30, 2021 $ 6.14  
Weighted Average Remaining Life (in years)    
Outstanding at December 31 7 years 7 months 6 days 8 years 1 month 6 days
Exercisable at September 30, 2021 7 years 3 months 18 days