Note 3 - Net Loss Per Share (Tables)

9 Months Ended

Sep. 30, 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 September 30, 2019
Basic and diluted	$	(18,842	)		86,421	$	(0.22	)
Nine months ended September 30, 2019
Basic and diluted	$	(57,277	)		85,328	$	(0.67	)
Three months ended September 30, 2018
Basic and diluted	$	(24,357	)		80,325	$	(0.30	)
Nine months ended September 30, 2018
Basic and diluted	$	(52,953	)		75,648	$	(0.70	)

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Stock options		5,979		2,775		5,983		3,277
Contingent consideration liability (1)		851		1,738		851		1,738
Total securities excluded		6,830		4,513		6,834		5,015