Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenues	$ 9,741	$ 15,175	$ 18,232	$ 32,997
Costs and expenses:
Cost of sales	6,116	9,595	10,885	21,369
Selling, general and administrative	5,923	6,760	11,077	13,922
Restructuring charge	58	0	119	317
Research and development	280	295	564	766
Building impairment	2,965	0	2,965	0
Costs and expenses:	15,342	16,650	25,610	36,374
Operating loss	(5,601)	(1,475)	(7,378)	(3,377)
Interest income	3	6	6	16
Other expense	(2)	(221)	(4)	(484)
Loss from continuing operations before income taxes	(5,600)	(1,690)	(7,376)	(3,845)
Income tax benefit (expense)	15	(111)	15	94
Net loss from continuing operations	(5,585)	(1,801)	(7,361)	(3,751)
Loss from discontinued operations (net of income tax benefit of $0 in 2017 and 2016)	(1,269)	(827)	(1,999)	(1,514)
Net loss	$ (6,854)	$ (2,628)	$ (9,360)	$ (5,265)
Basic
Continuing operations (in dollars per share)	$ (0.24)	$ (0.08)	$ (0.31)	$ (0.16)
Discontinued operations (in dollars per share)	(0.05)	(0.04)	(0.08)	(0.07)
Basic net loss per common share (in dollars per share)	(0.29)	(0.12)	(0.39)	(0.23)
Diluted
Continuing operations (in dollars per share)	(0.24)	(0.08)	(0.31)	(0.16)
Discontinued operations (in dollars per share)	(0.05)	(0.04)	(0.08)	(0.07)
Diluted net loss per common share (in dollars per share)	$ (0.29)	$ (0.12)	$ (0.39)	$ (0.23)
Weighted-average number of common shares outstanding:
Basic (in shares)	23,738,000	23,381,000	23,606,000	23,283,000
Diluted (in shares)	23,738,000	23,381,000	23,606,000	23,283,000