Note 2 - Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2019

Notes Tables

Cumulative Effect of Adjustments for New Accounting Pronouncements on Balance Sheet [Table Text Block]

			Adjustments
			Due to
	December 31,		Adoption of			January 1,
	2018		ASC 842			2019
Other assets	$	171	$	629	(1)	$	800
Total assets	$	46,834	$	629	(1)	$	47,463
Accrued liabilities	$	6,766	$	230	(2)	$	6,996
Total current liabilities	$	10,760	$	230	(2)	$	10,990
Other noncurrent liabilities	$	634	$	399	(2)	$	1,033
Total liabilities	$	41,922	$	629	(2)	$	42,551
Total liabilities and stockholders' equity	$	46,834	$	629	(2)	$	47,463

Contract with Customer, Asset and Liability [Table Text Block]

	September 30,		December 31,		Nine Months
	2019		2018		Change
Customer contracts liabilities:
Marketing programs	$	470	$	639	$	(169	)
Other		-		47		(47	)
Total	$	470	$	686	$	(216	)

Revenue from External Customers by Geographic Areas [Table Text Block]

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2019		2018		2019		2018
North America	$	652	$	3,455	$	3,106	$	10,613
Asia Pacific		373		717		1,684		2,238
Europe and Middle East		27		612		316		1,143
Latin America		-		37		10		51
Total	$	1,052	$	4,821	$	5,116	$	14,045

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

	Nine Months Ended
	September 30,
	2019		2018
Stock options to purchase common stock		50,471		42,917
Warrants to purchase common stock		5,549		6,408
Restricted common stock awards		3,432		600