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Net Loss Per Share (Tables)
9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Schedule of Dilutive Securities Not Included in Diluted Per Share Calculations
Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows:
Three and Nine Months Ended September 30,
20212020
Options issued and outstanding and ESPP shares issuable
13,877,115 13,680,889 
Restricted shares subject to future vesting
2,621,853 2,269,897 
Total
16,498,968 15,950,786