Net Loss Per Share (Tables)

9 Months Ended

Sep. 30, 2014

Summary of Adjustment for Net Loss for Diluted Net Loss per Share Calculation

The following table summarizes the adjustment to net loss for the diluted net loss per share calculation for the three and nine months ended September 30, 2014 and 2013 (in thousands):

	Three months ended September 30,						Nine months ended September 30,
	2014			2013			2014			2013
Net loss	$	(9,798	)	$	(2,164	)	$	(34,512	)	$	(16,741	)
Less: gain from change in valuation of note payable		1,785			671			—			—
Net loss used to compute diluted net loss per share	$	(11,583	)	$	(2,835	)	$	(34,512	)	$	(16,741	)

Weighted Average Shares Outstanding for Diluted Net Loss per Share

The following table summarizes the adjustment to weighted average shares outstanding for the diluted net loss per share calculation for the three and nine months ended September 30, 2014 and 2013:

	Three months ended September 30,				Nine months ended September 30,
	2014		2013		2014		2013
Weighted average shares outstanding used for basic net loss per share		43,406,251		40,154,812		43,155,601		37,367,368
Add: weighted average shares of convertible note payable		1,449,212		1,400,848		—		—
Weighted average shares outstanding used for diluted net loss per share		44,855,463		41,555,660		43,155,601		37,367,368

Potentially Dilutive Securities Not Included in Calculation of Diluted Net Loss per Share

Potentially dilutive securities not included in the calculation of diluted net loss per share because to do so would be anti-dilutive are as follows (in common equivalent shares):

	Three months ended September 30,				Nine months ended September 30,
	2014		2013		2014		2013
Common stock options		1,949,096		3,041,033		2,313,182		2,474,614
Convertible note payable		—		—		1,449,212		1,400,848
Total		1,949,096		3,041,033		3,762,394		3,875,462