Net Loss Per Share

12 Months Ended

Dec. 31, 2018

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):



	2018	2017	2016
Options to purchase common stock	5,395	5,335	4,711
Restricted stock units	1,147	313	115
Common stock warrants	535	317	491