Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Stock Option Activity (Details)

v3.21.2
Stockholders' Equity - Stock Option Activity (Details) - USD ($)
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Shares    
Stock options outstanding at beginning of period 1,480,139  
Granted 604,094  
Exercised (69,493)  
Forfeited/Expired (124,566)  
Stock options outstanding at end of period 1,890,174  
Stock options exercisable at end of period 1,089,062  
Weighted Average Exercise Price    
Stock options outstanding at beginning of period (in dollars per share) $ 11.05  
Granted (in dollars per share) 5.69  
Exercised (in dollars per share) 6.57  
Forfeited/Expired (in dollars per share) 8.93  
Stock options outstanding at end of period (in dollars per share) 9.64  
Stock options exercisable at end of period $ 12.59  
Aggregate Intrinsic Value    
Stock options outstanding at beginning of period $ 628,169  
Exercised 32,274  
Stock options outstanding at end of period 817,628  
Stock options exercisable at end of period $ 266,618  
Weighted Average Remaining Contractual Life    
Stock options outstanding at end of period 8 years 8 months 12 days  
Stock options exercisable at end of period 8 years 4 months 24 days  
Unrecognized stock-based compensation expense $ 2,900,000  
Unrecognized stock-based compensation expense, recognition period 1 year 4 months 24 days  
Weighted-average fair value of options $ 4.41 $ 6.30