Net Loss Per Share

9 Months Ended

Sep. 30, 2013

Earnings Per Share [Abstract]

Net Loss Per Share

2. Net Loss Per Share

Basic net loss per share is calculated by dividing the net loss by the weighted-average number of common shares outstanding for the period, without consideration for common stock equivalents and adjusted for the weighted-average number of common shares outstanding that are subject to repurchase. The Company has excluded 101,875, 116,875, 105,625 and 120,625 weighted-average shares subject to repurchase from the weighted-average number of common shares outstanding for the three months ended September 30, 2013 and 2012 and the nine months ended September 30, 2013 and 2012, respectively. Diluted net loss per share is calculated by dividing the net loss by the weighted-average number of common share equivalents outstanding for the period determined using the treasury-stock method. Dilutive common stock equivalents are comprised of convertible preferred stock, warrants for the purchase of convertible preferred stock, warrants for the purchase of common stock, and options outstanding under the Company’s equity incentive plans. For all periods presented, there is no difference in the number of shares used to calculate basic and diluted shares outstanding due to the Company’s net loss position.

The following table summarizes the weighted-average anti-dilutive securities excluded from the calculation of diluted net loss per share (in common stock equivalent shares):

	Three and Nine Months Ended September 30,
	2013		2012
Convertible preferred stock outstanding		—		2,439,002
Warrants for convertible preferred stock		—		14,000
Warrants for common stock		106,000		—
Common stock options		231,250		123,250
		337,250		2,576,252