Net Loss Per Share (Tables)

9 Months Ended

Sep. 30, 2013

Earnings Per Share [Abstract]

Summary of Weighted-Average Anti-Dilutive Securities Excluded from Calculation of Diluted Net Loss Per Share

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