Net Loss Per Share (Tables)

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Schedule of Outstanding Shares of Common Stock Equivalents Excluded from Calculation of Diluted Net Loss Per Share

The following shares of common stock equivalents were excluded from the calculation of diluted net loss per share for the periods presented because including them would have been antidilutive:

	June 30, 2019		June 30, 2018
	(in thousands)
Options to purchase common stock		13,262,054		10,569,959
Warrant for common stock		73,529		—
Total potential dilutive shares		13,335,583		10,569,959