Net Loss Per Share

12 Months Ended

Dec. 31, 2017

Net loss per share is computed by dividing the net loss by the weighted average number of shares of common stock outstanding. Outstanding stock options, warrants and preferred stock have not been included in the calculation of diluted net loss per share because to do so would be anti-dilutive. Accordingly, the numerator and the denominator used in computing both basic and diluted net loss per share for each period are the same.

The following outstanding options, restricted stock units and warrants as of December 31 were excluded from the computation of diluted net loss per share for the periods presented because their effect would have been anti-dilutive (in thousands):



	2017	2016	2015
Options to purchase common stock	5,335	4,711	4,069
Restricted stock units	313	115	—
Common stock warrants	317	491	572