Note 7 - Equity Award Plans (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

Share-based Payment Arrangement, Option, Activity [Table Text Block]

	Options Outstanding
	Number of Shares			Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Term (in Years)		Aggregate Intrinsic Value
Balances at December 31, 2018		436		$	29.01		6.79	$	—
Options forfeited and cancelled		(6	)		63.58		—		—
Balances at March 31, 2019		430			28.49		6.60		—
Options exercisable		310			35.71		5.83		—
Options vested		310			35.70		5.83		—
Options vested and expected to vest		419			28.93		6.55		—

Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

	RSUs Outstanding
	Number of Shares			Weighted Average Grant Date Fair Value Per Unit
Granted and unvested at December 31, 2018		834		$	7.99
RSUs granted		116			4.34
RSUs vested		(16	)		20.22
RSUs cancelled and withheld to cover taxes		(80	)		10.53
Granted and unvested at March 31, 2019		854		$	7.03