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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Summary of ESPP Share Activity
The following is a summary of 2019 ESPP share activity for the nine months ended September 30, 2021:
Shares
Available for future purchases, January 1, 2021369,771 
Additional shares reserved under 2019 ESPP86,490 
Purchases(87,473)
Available for future purchases, September 30, 2021368,788