Note 10 - Net Loss Per Share Attributable to Common Stockholders (Tables)

6 Months Ended

Jun. 30, 2015

Notes Tables

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Convertible preferred stock		-		7,581		-		7,581
Common stock warrants		-		660		-		660
Outstanding stock options		1,758		1,134		1,758		1,134
		1,758		9,375		1,758		9,375