Note 9 - Net Loss Per Share Attributable to Common Stockholders (Tables)

9 Months Ended

Sep. 30, 2015

Notes Tables

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
Convertible preferred stock		-		7,581		-		7,581
Common stock warrants		-		660		-		660
Outstanding stock options		1,800		1,134		1,800		1,134
Outstanding ESPP shares		1		-		1		-
		1,801		9,375		1,801		9,375