Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2021

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: 

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Warrants to purchase common stock		1,679,673		1,841,879		1,679,673		1,841,879
Common stock options		5,150,333		4,273,065		5,150,333		4,273,065
Employee stock purchase plan	—			4,716	—			4,716
Total excluded securities		6,830,006		6,119,660		6,830,006		6,119,660