SEGMENT REPORTING - Revenue By Geographic Regions (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Product sales									$ 80,008	$ 80,454	$ 80,683
License and fee income									2,551	2,276	1,501
Revenue	19,104	19,916	21,956	21,583	19,879	21,062	21,536	20,253	82,559	82,730	82,184
Product sales | United States
Segment Reporting Information [Line Items]
Product sales									69,259	70,836	71,853
Product sales | Europe
Segment Reporting Information [Line Items]
Product sales									7,361	7,663	7,544
Product sales | Other foreign countries
Segment Reporting Information [Line Items]
Product sales									3,388	1,955	1,286
License and fee income | United States
Segment Reporting Information [Line Items]
License and fee income									1,103	953	603
License and fee income | Canada
Segment Reporting Information [Line Items]
License and fee income									$ 1,448	$ 1,323	$ 898