Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Schedule of Potentially Dilutive Securities not Included in Calculation of Diluted Net Loss Per Share

Potentially dilutive securities not included in the calculation of diluted net loss per share, because to do so would be anti-dilutive, are as follows (in common stock equivalent shares; in thousands):

	September 30,
	2021		2020
Common stock options issued and outstanding		5,649		3,545
Common stock subject to repurchase or forfeiture		18		92
ESPP shares pending issuance		12		19
Total		5,679		3,656