Net Loss Per Common Share

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Net Loss Per Common Share

Net Loss Per Common Share

Basic and diluted net loss per common share is calculated as follows (in thousands, except share and per share data):

	Three Months Ended March 31,
	2015			2014
Numerator:
Net loss	$	(5,343	)	$	(13,717	)
Less: Accretion of dividends on the redeemable convertible preferred stock	—			(2,605		)
Net loss attributable to common stockholders	$	(5,343	)	$	(16,322	)
Denominator:
Weighted-average common shares outstanding, basic and diluted	69,249,462			4,707,867
Net loss per common share, basic and diluted	$	(0.08	)	$	(3.47	)

Diluted loss per common share is the same as basic loss per common share for all periods presented because the effects of potentially dilutive items were anti-dilutive given our net losses. The following common share equivalent securities have been excluded from the calculation of weighted-average common shares outstanding because the effect is anti-dilutive for the periods presented:

	March 31, 2015	December 31, 2014
Anti-Dilutive Common Share Equivalents
Warrants to purchase common stock	2,516,288	2,516,288
Restricted stock units and restricted stock	418,778	88,418
Stock options	10,105,177	10,371,469
Total anti-dilutive common share equivalents	13,040,243	12,976,175

The weighted average exercise price for warrants to purchase common stock was $9.51 as of March 31, 2015 and December 31, 2014.