Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 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:

	Three Months Ended March 31,
	2020		2019
Stock options to purchase common stock		10,755,593		8,908,432
Unvested restricted stock units		20,000		150,400
Shares issuable under ESPP		14,693		6,911
Total common stock equivalents		10,790,286		9,065,743