Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Potentially Dilutive Securities Not Included in Calculation of Diluted Net Loss per Share

Potentially dilutive securities not included in the calculation of diluted net loss per share because to do so would be anti-dilutive are as follows (in common equivalent shares):

	Years ended December 31,
	2016	2015	2014
Common stock options	5,553,210	1,674,119	2,566,423
Convertible note payable	—	—	1,461,474
Total	5,553,210	1,674,119	4,027,897