Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 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:

	Six Months Ended June 30,
	2020		2019
Stock options to purchase common stock		11,578,482		8,628,459
Unvested restricted stock units		15,000		130,900
Shares issuable under ESPP		25,230		37,537
Total common stock equivalents		11,618,712		8,796,896