Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 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 June 30,		Six Months Ended June 30,
	2015	2014	2015	2014
Warrants to purchase common stock	118,881	96,000	118,881	96,000
Common stock options	1,037,500	688,750	1,037,500	688,750
Employee stock purchase plan	7,208	4,021	10,529	5,362
Total excluded securities	1,163,589	788,771	1,166,910	790,112