Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2015

Accounting Policies [Abstract]

Summary of Outstanding Potentially Dilutive Securities Excluded from Calculation of Diluted Net Loss Per Share

The following table sets forth the outstanding potentially dilutive securities that have been excluded from the calculation of diluted net loss per share because to do so would be anti-dilutive:

	Three Months Ended March 31,
	2015		2014
Warrants to purchase common stock		118,881		96,000
Common stock options		983,500		634,750
Employee stock purchase plan		3,322		1,340
Total excluded securities		1,105,703		732,090