Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 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 June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Warrants to purchase common stock		1,841,879		2,320,477		1,841,879		2,320,477
Common stock options		5,527,707		4,286,371		5,527,707		4,286,371
Employee stock purchase plan	—			60,079	—			84,793
Total excluded securities		7,369,586		6,666,927		7,369,586		6,691,641