Net Loss Per Share

3 Months Ended

12 Months Ended

Mar. 31, 2014

Dec. 31, 2013

Net Loss Per Share

Net Loss Per Share

9. Net Loss Per Share

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

	Three Months Ended March 31,
	2014			2013
Numerator:
Net loss	$	(14,488	)	$	(8,305	)
Accretion of Preferred Stock		(4,969	)		(3,582	)
Loss attributable to common stockholders — basic and diluted	$	(19,457	)	$	(11,887	)
Denominator:
Weighted-average number of common shares used in loss per share — basic and diluted		385,664			380,352
Loss per share — basic and diluted	$	(50.45	)	$	(31.25	)

The following potentially dilutive securities, prior to the use of the treasury stock method, have been excluded from the computation of diluted weighted-average shares outstanding, as they would be anti-dilutive. For the three months ended March 31, 2014 and 2013, all of the Company's classes of preferred stock, options to purchase common stock and warrants outstanding were assumed to be anti-dilutive as earnings attributable to common stockholders was in a loss position.

	Three Months Ended March 31,
	2014		2013
Convertible preferred stock		7,628,051		6,204,903
Options to purchase common stock		2,121,606		1,710,152
Warrants		1,010,257		14,850

15. Net Loss Per Share

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

	Year Ended December 31,
	2013			2012			2011
Numerator:
Net loss	$	(60,690	)	$	(69,128	)	$	(42,476	)
Extinguishment of preferred stock		—			—			60,937
Accretion of preferred stock		(17,471	)		(13,992	)		(10,933	)
Earnings attributable to participating preferred stockholders		—			—			(7,415	)
Earnings (loss) attributable to common stockholders — basic		(78,161	)		(83,120	)		113
Effect of dilutive convertible preferred stock		—			—			—
Earnings (loss) attributable to common stockholders — diluted	$	(78,161	)	$	(83,120	)	$	113
Denominator:
Weighted-average number of common shares used in (loss) earnings per share — basic		383,310			368,261			219,254
Effect of dilutive options to purchase common stock		—			—			203,917
Effect of dilutive convertible preferred stock		—			—			1,351,764
Weighted-average number of common shares used in (loss) earnings per share — diluted		383,310			368,261			1,774,935
(Loss) earnings per share — basic	$	(203.91	)	$	(225.71	)	$	0.51
Effect of dilutive options to purchase common stock		—			—		$	(0.25	)
Effect of dilutive convertible preferred stock		—			—		$	(0.20	)
(Loss) earnings per share — diluted	$	(203.91	)	$	(225.71	)	$	0.06

The following potentially dilutive securities, prior to the use of the treasury stock method, have been excluded from the computation of diluted weighted-average shares outstanding, as they would be anti-dilutive. For the years ended December 31, 2013 and 2012, all convertible preferred stock, options to purchase common stock and warrants outstanding were assumed to be anti-dilutive as earnings attributable to common stockholders was in a loss position.

	Year Ended December 31,
	2013		2012		2011
Convertible preferred stock		6,617,686		3,412,898		5,419,946
Options to purchase common stock		1,743,890		1,706,539		784,350
Warrants		545,797		15,000		8,860