Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Revenue	$ 13,586	$ 12,708
Cost of goods sold	5,124	5,006
Gross profit	8,462	7,702
Operating expenses:
Sales and marketing	2,622	2,737
Research and product development	1,941	2,241
General and administrative	2,000	1,968
Total operating expenses	6,563	6,946
Operating income	1,899	756
Other income, net	104	81
Income before income taxes	2,003	837
Provision for income taxes	731	352
Net income	1,272	485
Basic earnings per common share	$ 0.14	$ 0.05
Diluted earnings per common share	$ 0.13	$ 0.05
Basic weighted average shares outstanding	9,100,107	9,082,546
Diluted weighted average shares outstanding	9,508,479	9,558,941
Other comprehensive income:
Unrealized gain on available-for-sale securities, net of tax	55	73
Change in foreign currency translation adjustment	(180)	0
Comprehensive income	$ 1,147	$ 558