Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2015

Computation of Basic and Diluted Net Loss per Share

The following table sets forth the reconciliation of the numerator and denominator used in the computation of basic and diluted net loss per share for the three months ended March 31, 2015 and 2014 (in thousands, except per share amounts):


	Three Months Ended
	March 31,
	2015			2014
Numerator for Basic and Diluted:
Net loss used for basic calculation	$	(9,460	)	$	(225	)
Effect of revaluation of warrant liability		(6,296	)		(9,034	)

Adjusted net loss used for diluted calculation	$	(15,756	)	$	(9,259	)

Denominator:
Basic weighted average number of shares outstanding		93,411			72,088
Effect of dilutive potential shares		1,251			3,070

Diluted weighted average number of shares outstanding		94,662			75,158

Net loss per share:
Basic	$	(0.10	)	$	(0.00	)
Diluted	$	(0.17	)	$	(0.12	)

Anti-Dilutive Effect of Common Shares

The table below presents shares underlying stock options and employee stock purchase plan rights that are excluded from the calculation of the weighted average number of shares outstanding used for the calculation of diluted net loss per share. These are excluded from the calculation due to their anti-dilutive effect for the three months ended March 31, 2015 and 2014 (shares in thousands):


	Three Months Ended
	March 31,
	2015		2014
Weighted average number of anti-dilutive potential shares		13,439		16,901