Net Loss Per Share

12 Months Ended

Dec. 31, 2012

Net Loss Per Share

Net Loss Per Share

3. Net Loss Per Share

        The following table sets forth the computation of basic and diluted net loss per share (in thousands, except per share amounts):

	Years Ended December 31,
	2012			2011			2010
Numerator:
Net loss from continuing operations	$	(72,624	)	$	(64,852	)	$	(56,411	)
Net income from discontinued operations		—			—			4,551
Less: Net income from discontinued operations attributable to noncontrolling interest		—			—			(1,121	)
Net income from discontinued operations attributable to Ironwood Pharmaceuticals, Inc.		—			—			3,430
Net loss attributable to Ironwood Pharmaceuticals, Inc.	$	(72,624	)	$	(64,852	)	$	(52,981	)
Denominator:
Weighted average number of common shares used in net loss per share attributable to Ironwood Pharmaceuticals, Inc.—basic and diluted		106,402,639			99,874,790			89,653,364
Net loss per share associated with continuing operations—basic and diluted	$	(0.68	)	$	(0.65	)	$	(0.63	)
Net income per share from discontinued operations attributable to Ironwood Pharmaceuticals, Inc.—basic and diluted		—			—			0.04
Net loss per share attributable to Ironwood Pharmaceuticals, Inc.—basic and diluted	$	(0.68	)	$	(0.65	)	$	(0.59	)

        The following potentially dilutive securities have been excluded from the computation of diluted weighted average shares outstanding as of December 31, 2012, 2011 and 2010 as they would be anti-dilutive:

	Years Ended December 31,
	2012		2011		2010
Options to purchase common stock		19,539,429		16,424,500		14,603,229
Shares subject to repurchase		80,230		160,413		284,960
		19,619,659		16,584,913		14,888,189

        The number of shares issuable under the Company's employee stock purchase plan that were excluded from the calculation of diluted weighted average shares outstanding because their effects would be anti-dilutive was insignificant.