Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Summary of Outstanding Potentially Dilutive Securities Excluded from Calculation of Diluted Net Loss Per Share

For the periods presented, the following table sets forth the outstanding potentially dilutive securities that have been excluded from the calculation of diluted net loss per share because to do so would be anti-dilutive:

	Year Ended December 31,
	2019		2018
Common stock subject to repurchase	—			18,791
Warrants to purchase common stock		2,713,561		2,713,561
Common stock options		3,114,371		3,017,624
Employee stock purchase plan		25,000		10,785
Total excluded securities		5,852,932		5,760,761