Note 12 - Net Loss Per Share Attributable to Common Stockholders

12 Months Ended

Dec. 31, 2017

Notes to Financial Statements

Earnings Per Share [Text Block]

12. Net Loss per Share Attributable to Common Stockholders

As described in Note

2,

Summary of Significant Accounting Policies, 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 years ended

December 31, 2017,

2016

and

2015

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:

	Year Ended December 31,
	2017		2016		2015
Outstanding stock options		2,681,072		2,166,254		2,200,369
Convertible preferred stock		22,112,775		-		-
		24,793,847		2,166,254		2,200,369