Note 3 - Balance Sheet Detail (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	December 31,
	201 8		201 7
Raw materials	$	16,991	$	19,160
Work in process		2,306		2,744
Finished goods		8,717		6,878
Total	$	28,014	$	28,782

Property, Plant and Equipment [Table Text Block]

	December 31,
	201 8		201 7
Leasehold improvements	$	660	$	640
Office equipment and furniture		2,835		2,370
Machinery and equipment		7,304		6,277
		10,799		9,287
Less: Accumulated depreciation		(8,127)		(7,191)
Property and equipment, net	$	2,672	$	2,096

Schedule of Intangible Assets and Goodwill [Table Text Block]

	Gross Carrying Amount		Accumulated Amortization & Impairment Amount		Net Amount
December 31, 201 8
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, 201 7
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

Schedule of Accrued Liabilities [Table Text Block]

	December 31,
	201 8		201 7
Accrued payroll and related expenses	$	9,377	$	12,567
Sales and marketing accruals		2,379		3,710
Accrued sales tax		2,935		2,920
Warranty liability		4,666		3,508
Other accrued liabilities		3,943		4,143
Total	$	23,300	$	26,848