CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
REVENUE:
Product sales	$ 58,505	$ 58,144	$ 116,996	$ 125,607
Services and other	7,898	6,515	14,654	12,776
Total revenue	66,403	64,659	131,650	138,383
COSTS AND EXPENSES:
Cost of product sales	24,363	22,367	47,928	46,266
Cost of services and other	3,319	3,426	7,098	6,626
Research and development	13,588	15,298	26,919	31,566
Selling, general and administrative	40,526	26,675	68,450	53,887
Total costs and expenses	81,796	67,766	150,395	138,345
(Loss) income from operations	(15,393)	(3,107)	(18,745)	38
Interest income and other, net	2,276	499	2,302	(1,395)
Interest expense	218	937	1,198	1,875
Loss before income taxes	(13,335)	(3,545)	(17,641)	(3,232)
Income tax (benefit) provision	(44,226)	127	(44,315)	401
Net income (loss)	$ 30,891	$ (3,672)	$ 26,674	$ (3,633)
Basic net income (loss) per common share	$ 0.44	$ (0.05)	$ 0.38	$ (0.05)
Diluted net income (loss) per common share	$ 0.43	$ (0.05)	$ 0.38	$ (0.05)
Shares used in computing basic net income (loss) per common share	70,161	69,504	70,069	70,700
Shares used in computing diluted net income (loss) per common share	71,918	69,504	72,263	70,700