Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2015

Schedule of assets and liabilities that are measured at fair value on a recurring basis

The following table summarizes the assets and liabilities measured at fair value on a recurring basis (in thousands):



	September 30, 2015		Level 1		Level 2		Level 3
Assets
Cash and cash equivalents:
Cash	$	6,573	$	6,573	$	—	$	—
Money market funds	100,808		100,808		—		—
Corporate debt securities	1,000		—		1,000		—
Commercial paper	1,500				1,500
Total cash and cash equivalents	109,881		107,381		2,500		—

Short-term investments:
Corporate debt securities	25,382		—		25,382		—
Commercial paper	2,750		—		2,750		—
Total short-term investments	28,132		—		28,132		—

Total	$	138,013	$	107,381	$	30,632	$	—



	December 31, 2014		Level 1		Level 2		Level 3
Assets
Cash and cash equivalents:
Cash	$	1,025	$	1,025	$	—	$	—
Money market funds	3,565		3,565		—		—
Corporate debt securities	2,003		—		2,003		—
Total cash and cash equivalents	6,593		4,590		2,003		—

Short-term investments:
Corporate debt securities	21,210		—		21,210		—
Commercial paper	1,500		—		1,500		—
Total short-term investments	22,710		—		22,710		—

Total	$	29,303	$	4,590	$	24,713	$	—

Schedule of earnings per share, diluted

The gain on fair value of warrant liability for the three months ended September 30, 2014 resulted in a dilutive impact as detailed further below:



	Three Months Ended September 30, 2014
Numerator:
Net loss	$	(8,617	)
Minus: Gain on fair value of warrant liabilities	1,907
Adjusted net loss	$	(10,524	)

Denominator:
Weighted average number of shares used in computing net loss per share, basic	13,527,113
Plus: Effect of dilutive potential common shares from warrants	1,190,140
Weighted average number of shares used in computing net loss per share, diluted	14,717,253

Diluted net loss per share	$	(0.72	)

Schedule of potentially dilutive securities not included in the calculation of diluted net loss per share because to do so would be anti-dilutive

The following table presents the weighted average number of potentially dilutive securities not included in the calculation of diluted net loss per share due to the anti-dilutive effect of the securities:



	Three Months Ended		Nine Months Ended
	September 30,		September 30,
	2015	2014	2015	2014
Common stock options	634,321	252,678	517,004	264,723
Common stock warrants	1,460,017	280,720	1,666,229	1,552,441
Total	2,094,338	533,398	2,183,233	1,817,164