Net Loss Per Common Share (Tables)

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Potential Common Stock Equivalents Excluded from Calculation of Diluted Net Loss Per Common Share

The following potential common stock equivalents were not included in the calculation of diluted net loss per common share because the inclusion thereof would be antidilutive.

	Year Ended December 31,
	2016		2015		2014
Outstanding stock options		1,267,329		1,684,783		2,792,021
Unvested restricted stock		1,297,054		969,758		335,933
Total		2,564,383		2,654,541		3,127,954