Note 3 - Net Loss Per Share (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

				Weighted-Average
				Shares
	Net Loss			Outstanding		Per Share
	(Numerator)			(Denominator)		Amount
Three months ended March 31, 2019
Basic and diluted	$	(18,735	)		84,542	$	(0.22	)
Three months ended March 31, 2018
Basic and diluted	$	(13,424	)		72,517	$	(0.19	)

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

	Three Months Ended March 31,
	2019		2018
Stock options		6,522		3,483
Contingent consideration liability (1)		2,565		2,359
Total securities excluded		9,087		5,842