Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2020

Accounting Policies [Abstract]

Summary of Potential Common Shares Excluded from Calculation of Diluted Net Loss per Share

The following potential common shares, presented based on amounts outstanding at each period end, were excluded from the calculation of diluted net loss per share attributable to common stockholders for the periods indicated because including them would have had an anti-dilutive effect:

	Nine Months Ended September 30,
	2020		2019
Stock options to purchase common stock		9,802,633		8,258,031
Unvested restricted stock units		—		145,900
Shares issuable under ESPP		3,748		13,171
Total common stock equivalents		9,806,381		8,417,102