Note 4 - Balance Sheet Detail (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	December 31,
	2017			2016*
Raw materials	$	19,160	$	9,072
Work in process		2,744		1,894
Finished goods		6,878		4,011
Total	$	28,782	$	14,977

*

The Raw materials balance in prior year was reclassified for consistency with current year.

Property, Plant and Equipment [Table Text Block]

	December 31,
	2017			2016
Leasehold improvements	$	640		$	652
Office equipment and furniture		2,370			2,973
Machinery and equipment		6,277			5,435
		9,287			9,060
Less: Accumulated depreciation		(7,191	)		(7,153	)
Total Property and equipment, net	$	2,096		$	1,907

Schedule of Intangible Assets and Goodwill [Table Text Block]

	Gross Carrying Amount		Accumulated Amortization & Impairment Amount		Net Amount
December 31, 2017
Patent sublicense	$	1,218	$	1,218	$	—
Customer relationship intangible related to acquisition		2,510		2,510		—
Other identified intangible assets related to acquisition		780		780		—
Other intangible		155		155		—
Goodwill		1,339		—		1,339
Total	$	6,002	$	4,663	$	1,339
December 31, 2016
Patent sublicense	$	1,218	$	1,218	$	—
Customer relationship intangible related to acquisition		2,510		2,508		2
Other identified intangible assets related to acquisition		780		780		—
Other intangible		155		155		—
Goodwill		1,339		—		1,339
Total	$	6,002	$	4,661	$	1,341

Schedule of Accrued Liabilities [Table Text Block]

	December 31,
	2017		2016
Accrued payroll and related expenses	$	12,567	$	9,036
Sales and marketing accruals		3,710		706
Accrued sales tax		2,920		2,373
Warranty liability		3,508		2,461
Other accrued liabilities		4,143		2,821
Total	$	26,848	$	17,397