Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Accounting Policies [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 equivalent shares):

	Year Ended December 31,
	2013		2012		2011
Convertible preferred stock outstanding		—		2,439,002		2,439,002
Warrants for convertible preferred stock		—		14,000		10,000
Warrants for common stock		106,000		—		—
Common stock options		624,750		123,250		123,250
		730,750		2,576,252		2,572,252