CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
REVENUE:
Product sales	$ 80,041	$ 78,069	$ 239,305	$ 227,644
Services and other	6,489	9,017	24,909	27,845
Total revenue	86,530	87,086	264,214	255,489
COSTS AND EXPENSES:
Cost of product sales	26,760	29,140	81,501	89,211
Cost of services and other	4,257	6,426	15,284	19,358
Research and development	13,003	12,926	38,035	37,443
Selling, general and administrative	36,526	33,718	107,599	108,546
Litigation settlement	10,000	0	10,000	5,100
Total costs and expenses	90,546	82,210	252,419	259,658
Income (loss) from operations	(4,016)	4,876	11,795	(4,169)
Other income (expense), net	74	(1,008)	(324)	703
Interest expense	1,468	1,595	4,422	4,972
Income (loss) before income taxes	(5,410)	2,273	7,049	(8,438)
Income tax expense (benefit)	(74)	(111)	993	563
Net income (loss)	$ (5,336)	$ 2,384	$ 6,056	$ (9,001)
Basic net income (loss) per common share (in usd per share)	$ (0.07)	$ 0.03	$ 0.08	$ (0.12)
Diluted net income (loss) per common share (in usd per share)	$ (0.07)	$ 0.03	$ 0.07	$ (0.12)
Shares used in computing basic net income (loss) per common share (in shares)	79,856	73,413	77,930	72,955
Shares used in computing diluted net income (loss) per common share (in shares)	79,856	76,315	80,908	72,955