Net Loss Per Common Share

12 Months Ended

Dec. 31, 2013

Net Loss Per Common Share

Net Loss Per Common Share

4. Net Loss Per Common Share

        Basic and diluted net loss per common share is determined by dividing net loss applicable to common stockholders by the weighted average common shares outstanding during the period. For the periods where there is a net loss attributable to common stockholders, the outstanding shares of preferred stock, stock options, unvested restricted stock, and warrants have been excluded from the calculation of diluted loss per common stockholder because their effect would be anti-dilutive.

        Therefore, the weighted average shares used to calculate both basic and diluted loss per share would be the same. The following table sets forth the computation of basic and diluted net loss per share for the periods indicated:

	Years ended December 31,
	2013			2012			2011
Basic and diluted net loss per common share calculation:
Net loss	$	(51,145	)	$	(14,562	)	$	(18,633	)
Accretion of preferred stock dividends		(5,891	)		(7,063	)		(6,838	)
Net loss attributable to common shareholders	$	(57,036	)	$	(21,625	)	$	(25,471	)
Weighted average common shares outstanding		9,003			1,452			1,394
Net loss per share of common stock—basic and diluted	$	(6.34	)	$	(14.89	)	$	(18.27	)

        The following potentially dilutive securities have been excluded from the computations of diluted weighted average shares outstanding for the periods presented, as they would be anti-dilutive:

	Years ended December 31,
	2013		2012		2011
Redeemable convertible preferred stock		—		16,663		16,064
Options outstanding		2,708		1,344		1,113
Warrants		88		94		39
Total		2,796		18,101		17,216