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Stock-Based Compensation - Restricted stock units activity under company's stock plans (Details) - Restricted stock units
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Number of Shares  
Beginning balance (in shares) | shares 0
Granted (in shares) | shares 94,304
Vested (in shares) | shares (11,305)
Ending balance (in shares) | shares 82,999
Weighted- Average Grant Date Fair Value (per share)  
Beginning balance (in dollars per share) | $ / shares
Granted (in dollars per share) | $ / shares 20.00
Vested (in dollars per share) | $ / shares 20.00
Ending balance (in dollars per share) | $ / shares $ 20.00
2021 Equity Incentive Plan  
Number of Shares  
Beginning balance (in shares) | shares 0
Granted (in shares) | shares 4,696,833
Vested (in shares) | shares (105,901)
Forfeited / cancelled (in shares) | shares (47,500)
Ending balance (in shares) | shares 4,543,432
Weighted- Average Grant Date Fair Value (per share)  
Beginning balance (in dollars per share) | $ / shares $ 0
Granted (in dollars per share) | $ / shares 23.38
Vested (in dollars per share) | $ / shares 20.00
Forfeited / cancelled (in dollars per share) | $ / shares 23.61
Ending balance (in dollars per share) | $ / shares $ 23.46