Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Options and RSUs (Details)

v3.21.2
Stock-Based Compensation - Options and RSUs (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2021
shares
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
item
$ / shares
shares
Sep. 30, 2020
USD ($)
Stock Based Compensation          
Share-based compensation | $   $ 2,202 $ 1,884 $ 7,147 $ 5,665
Additional disclosures          
Shares of common stock available for grant   10,403,690   10,403,690  
2018 Plan          
Additional disclosures          
Additional shares approved 825,000        
Employee stock option          
Stock Based Compensation          
Number of homogenous groups for purposes of determining fair values of options | item       3  
Contractual term of the option       10 years  
Weighted-average assumptions relating to options granted          
Risk-free interest rate (as a percent)   1.10% 0.50% 1.00% 1.20%
Expected term (in years)   6 years 6 years 8 months 12 days 6 years 6 months 6 years 6 months
Dividend yield (as a percent)   0.00% 0.00% 0.00% 0.00%
Expected volatility (as a percent)   70.40% 70.50% 70.60% 66.00%
Additional disclosures          
Options granted (in shares)       6,373,981  
Options outstanding   30,489,827   30,489,827  
Grant-date weighted-average fair value (in dollars per share) | $ / shares       $ 2.36  
Options exercised during the period (in shares)       1,176,386  
Employee stock option | Vesting upon achievement of corporate performance-based milestones          
Additional disclosures          
Options outstanding   2,018,125   2,018,125  
Total unrecognized compensation costs | $   $ 4,200   $ 4,200  
Employee stock option | Consultant          
Stock Based Compensation          
Contractual term of the option       10 years  
Restricted stock units          
Additional disclosures          
Granted (in shares)       233,750  
Weighted average fair value (in dollars per share) | $ / shares       $ 3.67  
Restricted stock units | Minimum          
Additional disclosures          
Vesting period       1 year  
Restricted stock units | Maximum          
Additional disclosures          
Vesting period       2 years  
Share based compensation options and RSUs          
Additional disclosures          
Total unrecognized compensation costs | $   $ 15,500   $ 15,500  
Weighted-average recognition period of unamortized compensation cost       1 year 11 months 23 days