Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Potentially Dilutive Shares Excluded From Calculation of Diluted Net Loss Per Share

The following potentially dilutive shares were excluded from the calculation of diluted net loss per share because their effect would have been anti-dilutive for the periods presented:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Stock options		1,679,969		1,455,713		1,584,046		1,429,883
Restricted stock units		51,679		63,709		64,043		52,579