Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Revenues	$ 17,822	$ 15,103
Costs and expenses:
Cost of sales	11,774	8,437
Selling, general and administrative	7,479	8,203
Research and development	1,158	872
Costs and expenses:	20,411	17,512
Operating (loss)	(2,589)	(2,409)
Interest expense	0	(27)
Interest income	10	7
Other expense	(263)	(96)
(Loss) before income taxes	(2,842)	(2,525)
Income tax benefit	205	871
Net (loss)	$ (2,637)	$ (1,654)
Net (loss) per common share:
Basic (in dollars per share)	$ (0.11)	$ (0.07)
Diluted (in dollars per share)	$ (0.11)	$ (0.07)
Weighted-average number of common shares outstanding:
Basic (in shares)	23,184	22,927
Diluted (in shares)	23,184	22,927