Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
Revenue	$ 46,417	$ 46,067
Cost of goods sold	19,089	18,522
Gross profit	27,328	27,545
Operating expenses:
Sales and marketing	8,112	8,120
Research and product development	8,261	7,128
General and administrative	6,934	5,427
Proceeds from litigation, net	(38,500)	(3,702)
Total operating expenses	(15,193)	16,973
Operating income	42,521	10,572
Other income, net	34	24
Income before income taxes	42,555	10,596
Provision for income taxes	(15,908)	(3,667)
Net income	$ 26,647	$ 6,929
Basic earnings per common share (in dollars per share)	$ 2.93	$ 0.77
Diluted earnings per common share (in dollars per share)	$ 2.89	$ 0.75
Basic weighted average shares (in shares)	9,107,234	9,027,934
Diluted weighted average shares (in shares)	9,214,685	9,271,811