Loss per Share (Tables)

3 Months Ended

Mar. 31, 2015

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 for the periods indicated because including them would have had an anti-dilutive effect:

	Three Months Ended March 31,
	2015		2014
Stock options and restricted stock units		4,553,028		3,958,495
Unvested restricted stock		5,681		18,750
Employee stock purchase plan options		1,125		—
		4,559,834		3,977,245