Note 9 - Net Loss Per Share Attributable to Common Stockholders

9 Months Ended

Sep. 30, 2017

Notes to Financial Statements

Earnings Per Share [Text Block]

9. Net Loss per Share Attributable to Common Stockholders

The Company computes basic and diluted loss per share using a methodology that gives effect to the impact of outstanding participating securities (the “two-class method”). As the

three

and

nine

months ended

September 30, 2017

and

2016

resulted in net losses, there is

no

income allocation required under the

two

-class method or dilution attributed to weighted-average shares outstanding in the calculation of diluted loss per share.

The following Common Stock equivalents, presented on an as converted basis, were excluded from the calculation of net loss per share for the periods presented, due to their anti-dilutive effect:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Outstanding stock options		2,683,912		2,169,617		2,683,912		2,169,617
Outstanding ESPP shares		34,464		10,913		34,464		10,913
		2,718,376		2,180,530		2,718,376		2,180,530