Note 8 - Net Loss Per Share (Tables)

3 Months Ended

Mar. 31, 2017

Notes Tables

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

	Three Months Ended
	March 3 1 ,
	201 7		201 6
Options to purchase common stock		1,088		3,191
Restricted stock units		384		405
Performance stock units		164		158
Employee stock purchase plan shares		49		42
Total		1,685		3,796