Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2013

Computation of Basic and Diluted Net Income (Loss) per Common Share

The following table sets forth the reconciliation of the numerator and denominator used in the computation of basic and diluted net income (loss) per common share for the three months ended March 31, 2013, and 2012 (in thousands, except per share amounts):


	Three Months Ended March 31,
	2013			2012
Numerator for Basic and Diluted:
Net loss	$	(10,252	)	$	(8,834	)
Denominator:
Basic weighted average number of common shares outstanding		59,730			53,088
Effect of dilutive potential common shares resulting from convertible preferred stock, stock options, restricted stock units, warrants and employee stock purchase plan rights		0			0

Diluted weighted average number of common shares outstanding		59,730			53,088

Net loss per common share:
Basic	$	(0.17	)	$	(0.17	)
Diluted	$	(0.17	)	$	(0.17	)

Anti-Dilutive Effect of Common Shares

The table below presents common shares underlying stock options, convertible preferred stock, employee stock purchase plan rights, warrants and restricted stock units that are excluded from the calculation of the weighted average number of common shares outstanding used for the calculation of diluted net loss per common share. These are excluded from the calculation due to their anti-dilutive effect for the three months ended March 31, 2013 and 2012 (shares in thousands):


	Three Months Ended March 31,
	2013		2012
Weighted average number of anti-dilutive potential common shares		15,531		14,399