Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2015

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,
	2015	2014	2013
Common stock options	1,674,119	2,566,423	3,639,270
Convertible note payable	—	1,461,474	1,411,659
Total	1,674,119	4,027,897	5,050,929