Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Condensed Consolidated Statements of Operations [Abstract]
Revenues	$ 53,768	$ 44,008	$ 104,332	$ 84,416
Cost of revenues	34,903	30,246	67,434	58,841
Gross profit	18,865	13,762	36,898	25,575
Operating expenses:
Selling and marketing	9,369	8,565	18,579	16,582
Research and development	3,589	3,202	7,306	6,237
Distribution	4,431	3,632	8,589	7,043
General and administrative	5,460	5,643	11,042	10,581
Total operating expenses	22,849	21,042	45,516	40,443
Loss from operations	(3,984)	(7,280)	(8,618)	(14,868)
Other expense:
Interest expense	(1,170)	(1,148)	(2,327)	(2,256)
Other (expense) income, net	(170)	330	(196)	213
Total other expense	(1,340)	(818)	(2,523)	(2,043)
Net loss before income taxes	(5,324)	(8,098)	(11,141)	(16,911)
Provision for income taxes	226	158	419	344
Net loss	$ (5,550)	$ (8,256)	$ (11,560)	$ (17,255)
Net loss per share, basic and diluted	$ (0.10)	$ (0.17)	$ (0.22)	$ (0.37)
Weighted-average shares outstanding, basic and diluted	54,014	47,492	53,716	47,228