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Stock-Based Compensation - Restricted stock units equivalent activity under company's stock plans (Details) - Restricted stock units
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Number of RSU Equivalents  
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 Base Price  
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
Aggregate Intrinsic Value  
Beginning aggregate intrinsic value | $
Vested aggregate intrinsic value | $ 391
Ending aggregate intrinsic value | $ $ 1,729