Supplementary Financial Information to Item 8. (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Net sales from continuing operations	$ 17,249	$ 18,335	$ 16,232	$ 12,587	$ 8,844	$ 7,304	$ 4,456	$ 2,096	$ 64,403	$ 22,700	$ 9,423
Gross profit from continuing operations	7,571	9,130	7,440	5,151	3,190	2,495	1,499	594	29,292	7,778	2,078
Net income from continuing operations	1,657	4,398	2,192	1,224	(65)	256	(384)	(4,053)	9,471	(4,246)	(5,907)
(Loss) income from discontinued operations	(373)	(142)	(81)	(95)	(685)	(659)	(238)	(17)	(691)	(1,599)	3,546
Net income (loss)	$ 1,284	$ 4,256	$ 2,111	$ 1,129	$ (750)	$ (403)	$ (622)	$ (4,070)	$ 8,780	$ (5,845)	$ (2,361)
Net income per share (basic):
Net income (loss) from continuing operations (in dollars per share)	$ 0.14	$ 0.42	$ 0.22	$ 0.13					$ 0.91	$ (0.55)	$ (1.24)
Net (loss) income from discontinued operations (in dollars per share)	(0.03)	(0.01)	(0.01)	(0.01)					(0.07)	(0.20)	0.74
Net income (loss) (in dollars per share)	0.11	0.41	0.21	0.12					0.84	(0.75)	(0.50)
Income (loss) from continuing operations
Net income (loss) from continuing operations (in dollars per share)	0.14	0.41	0.22	0.12					0.88	(0.55)	(1.24)
Net (loss) income from discontinued operations (in dollars per share)	(0.03)	(0.01)	(0.01)	(0.01)					(0.06)	(0.20)	0.74
Net income (loss) (in dollars per share)	$ 0.11	$ 0.40	$ 0.21	$ 0.11					$ 0.82	$ (0.75)	$ (0.50)
Net (loss) income per share (basic and diluted):
Net (loss) income from continuing operations (in dollars per share)					$ (0.01)	$ 0.03	$ (0.05)	$ (0.79)
Net loss from discontinued operations (in dollars per share)					(0.07)	(0.08)	(0.03)	0.00
Net loss (in dollars per share)					$ (0.08)	$ (0.05)	$ (0.08)	$ (0.79)