Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 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 June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Stock options		1,478,347		1,406,504		1,502,275		1,413,608
Restricted stock units		60,788		43,382		61,130		45,947