Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Options Outstanding (Details)

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Stockholders' Equity - Options Outstanding (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Number of Shares    
Balance at the beginning of the period (in shares) 9,564,519  
Granted (in shares) 2,657,642  
Exercised (in shares) (146,559)  
Forfeited/Cancelled (in shares) (521,726)  
Balance at the end of the period (in shares) 11,553,876 9,564,519
Vested or expected to vest at the end of the period (in shares) 11,553,876  
Exercisable at the end of the period (in shares) 6,917,596  
Weighted-Average Exercise Price    
Balance at the beginning of the period (in dollars per share) $ 3.07  
Granted (in dollars per share) 1.86  
Exercised (in dollars per share) 1.28  
Forfeited/Cancelled (in dollars per share) (2.77)  
Balance at the end of the period (in dollars per share) 2.83 $ 3.07
Vested or expected to vest at the end of the period (in dollars per share) 2.83  
Exercisable at the end of the period (in dollars per share) $ 3.45  
Intrinsic value of options exercisable $ 0.5  
Closing price of Company's stock (in dollars per share) $ 1.23  
Weighted Average Remaining Contractual Term    
Options Outstanding at the end of the period 6 years 11 months 26 days 7 years 2 months 1 day
Vested or expected to vest at the end of the period 6 years 11 months 26 days  
Exercisable at the end of the period 5 years 8 months 8 days