Loss per Share (Tables)

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Common Stock Excluded from Calculation of Diluted Earnings Per Share

The following common stock equivalents were excluded from the calculation of diluted net loss per share applicable to common stockholders for the periods indicated because including them would have had an anti-dilutive effect:

	Three and Nine Months Ended September 30,
	2019	2018
Stock options	6,185,935	5,485,314
Restricted stock units	733,100	453,736
Other stock units	—	167,031
Employee stock purchase plan	13,754	5,332
Total common stock equivalents	6,932,789	6,111,413