Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2016

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,
	2016	2015	2016	2015
Common stock subject to repurchase	45,000	45,000	45,000	45,000
Warrants to purchase common stock	118,881	118,881	118,881	118,881
Common stock options	1,275,624	1,037,500	1,275,624	1,037,500
Employee stock purchase plan	8,272	7,208	11,032	10,529
Total excluded securities	1,447,777	1,208,589	1,450,537	1,211,910