Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Revenue	$ 12,708	$ 11,293
Cost of goods sold	5,006	4,294
Gross profit	7,702	6,999
Operating expenses:
Sales and marketing	2,736	2,267
Research and product development	2,241	1,866
General and administrative	1,964	1,797
Total operating expenses	6,941	5,930
Operating income	761	1,069
Other income (expense), net	81	(14)
Income before income taxes	842	1,055
Provision for income taxes	352	324
Net income	490	731
Basic earnings per common share	$ 0.05	$ 0.08
Diluted earnings per common share	$ 0.05	$ 0.08
Basic weighted average shares outstanding	9,082,546	9,152,859
Diluted weighted average shares outstanding	9,558,941	9,394,181
Other comprehensive income:
Unrealized gain (loss) on available-for-sale securities, net of tax	96	0
Comprehensive income	$ 586	$ 731