Net Loss Per Share (Tables)

9 Months Ended

Sep. 30, 2018

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:

	September 30, 2018		September 30, 2017
	(in thousands)
Options to purchase common stock		10,719,737		7,685,449
Warrant for common stock		73,529		—
Total potential dilutive shares		10,793,266		7,685,449