Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2016		2015
Common stock subject to repurchase		45,000		45,000
Warrants to purchase common stock		118,881		118,881
Common stock options		1,161,624		983,500
Employee stock purchase plan		2,760		3,322
Total excluded securities		1,328,265		1,150,703