Note 2 - Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2018

Notes Tables

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

	Balance as of December 31, 2017			Adjustment Due to Adoption of ASC 606			Balance as of January 1, 2018
Consolidated Balance Sheet:
Liabilities
Accrued liabilities	$	4,605		$	18	(1)	$	4,623
Other noncurrent liabilities	$	327		$	(195	) (2)	$	132
Equity
Accumulated deficit	$	(105,581	)	$	177	(3)	$	(105,404	)

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

	For the Three Months Ended March 31, 2018
	As Reported			Balances Without Adoption of ASC 606			Effect of Change Higher/(Lower)
Consolidated Statement of Operations:
Revenue	$	3,699		$	3,489		$	210	(1)
Cost of revenue	$	2,352		$	2,343		$	9	(2)
Gross profit	$	1,347		$	1,146		$	201	(3)
Loss from operations	$	(11,340	)	$	(11,541	)	$	201	(3)
Comprehensive and net loss	$	(12,669	)	$	(12,870	)	$	201	(3)
Net loss per share:
Basic and diluted	$	(0.49	)	$	(0.50	)	$	0.01	(3)

	As of March 31, 2018
	As Reported			Balances Without Adoption of ASC 606			Effect of Change Higher/(Lower)
Consolidated Balance Sheet:
Liabilities
Accrued liabilities	$	4,257		$	4,255		$	(2	) (1)
Other noncurrent liabilities	$	218		$	598		$	380	(2)
Equity
Accumulated deficit	$	(118,073	)	$	(118,451	)	$	(378	) (3)

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

	Three Months Ended
	March 31,
	2018		2017
North America	$	2,606	$	1,895
Asia Pacific		891		743
Europe and Middle East		202		113
Latin America		-		290
Total	$	3,699	$	3,041

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

	Three Months Ended
	March 31,
	2018		2017
Stock options to purchase common stock		3,690,902		2,134,214
Warrants to purchase common stock		642,622		425,274
Restricted common stock awards		22,500		12,500