Quarterly report pursuant to Section 13 or 15(d)

Stock Option Plan and Stock-Based Compensation - Stock Options (Details)

v3.21.2
Stock Option Plan and Stock-Based Compensation - Stock Options (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Sep. 29, 2021
Options            
Outstanding as of beginning of period (in shares) 21,344,000 21,344,000 21,963,000 21,471,000 4,846,000  
Granted (in shares)   1,024,000 18,944,000      
Exercised (in shares) (35,420) (200,000) (55,000)      
Forfeited or expired (in shares)   (951,000) (1,772,000)      
Outstanding as of end of period (in shares) 21,344,000 21,344,000 21,963,000 21,471,000 4,846,000  
Options vested and expected to vest as of end of period (in shares) 21,344,000 21,344,000 21,963,000      
Vested and exercisable as of end of period (in shares) 7,776,000 7,776,000 2,524,000      
Weighted-Average Exercise Price            
Outstanding as of beginning of period (in usd per share)   $ 0.33 $ 0.98 $ 0.98    
Granted (in usd per share)   6.69 0.26      
Exercised (in usd per share)   1.56 0.98      
Forfeited or expired (in usd per share)   0.61 0.93      
Outstanding as of end of period (in usd per share) $ 0.61 0.61 0.36 $ 0.33 $ 0.98  
Options vested and expected to vest as of end of period (in usd per share) 0.61 0.61 0.36      
Vested and exercisable as of end of period (in usd per share) $ 0.58 $ 0.58 $ 0.97      
Weighted-Average Remaining Contractual Term in years   8 years 6 months 9 years 3 months 18 days 9 years 3 months 18 days 8 years 1 month 6 days  
Additional Disclosures            
Aggregate intrinsic value of options outstanding $ 151.2 $ 151.2   $ 3.9    
Aggregate intrinsic value of options exercised   $ 0.5 $ 0.1      
Weighted-average grant date fair value of options granted (in usd per share)   $ 3.58 $ 0.14      
Grant date fair value of options vested   $ 0.9 $ 0.2      
Share price (in usd per share)       $ 0.40   $ 8.15