Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues	$ 93,668	$ 81,795	$ 71,397
Costs and expenses:
Cost of sales	49,857	46,821	42,444
Selling, general and administrative	33,446	30,857	32,273
Gain on revaluation of ACT liability	(758)	(768)	(781)
Research and development	1,474	948	542
	84,019	77,858	74,478
Operating income (loss)	9,649	3,937	(3,081)
Interest expense	(148)	(143)	(120)
Interest income	35	11	32
Other expense	(279)	(119)	(241)
Income (loss) before taxes	9,257	3,686	(3,410)
Income tax (expense) benefit	(3,109)	(1,933)	1,104
Net income (loss)	$ 6,148	$ 1,753	$ (2,306)
Net income (loss) per common share:
Basic (in Dollars per share)	$ 0.26	$ 0.07	$ (0.10)
Diluted (in Dollars per share)	$ 0.25	$ 0.07	$ (0.10)
Weighted-average number of common shares outstanding:
Basic (in Shares)	24,095,000	24,213,000	24,148,000
Diluted (in Shares)	24,633,000	24,405,000	24,148,000