Net Loss Per Share (Tables)

3 Months Ended

Mar. 31, 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:

	March 31, 2019		March 31, 2018
	(in thousands)
Options to purchase common stock		13,198,385		10,202,831
Warrant for common stock		73,529		—
Total potential dilutive shares		13,271,914		10,202,831