Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Sales:
Sales	$ 11,125	$ 9,537
Cost of sales:
Cost of sales	6,037	4,420
Gross profit	5,088	5,117
Operating expenses:
Selling, general and administrative expenses	14,746	11,911
Research, development and engineering costs, net	4,227	2,861
Total operating expenses	18,973	14,772
Operating loss	(13,885)	(9,655)
Interest expense, net	851	850
Other (income) expense, net	(6)	23
Loss from continuing operations before taxes	(14,730)	(10,528)
Provision for income taxes	40	10
Loss from continuing operations	(14,770)	(10,538)
Discontinued operations:
Income from operations of discontinued operations		8
Provision for income taxes		3
Income from discontinued operations		5
Net loss	(14,770)	(10,533)
Other comprehensive gain:
Unrealized holding gain on investments arising during period		1
Other comprehensive gain		1
Comprehensive loss	$ (14,770)	$ (10,532)
Basic and diluted net loss per share:
Loss from continuing operations (in dollars per share)	$ (0.83)	$ (0.84)
Income from discontinued operations (in dollars per share)
Basic and diluted net loss per share (in dollars per share)	$ (0.83)	$ (0.84)
Basic and diluted weighted average shares outstanding (in shares)	17,739	12,509
Product [Member]
Sales:
Sales	$ 11,043	$ 9,081
Cost of sales:
Cost of sales	5,908	4,066
Service [Member]
Sales:
Sales	82	456
Cost of sales:
Cost of sales	$ 129	$ 354