CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
REVENUE:
Product sales	$ 79,897	$ 75,880	$ 159,265	$ 149,576
Services and other	9,069	9,552	18,419	18,827
Total revenue	88,966	85,432	177,684	168,403
COSTS AND EXPENSES:
Cost of product sales	27,156	30,560	54,741	60,071
Cost of services and other	4,731	6,028	11,027	12,932
Research and development	12,911	12,882	25,032	24,517
Selling, general and administrative	35,642	36,266	71,074	74,828
Litigation settlement	0	0	0	5,100
Total costs and expenses	80,440	85,736	161,874	177,448
Income (loss) from operations	8,526	(304)	15,810	(9,045)
Other income (expense), net	275	1,418	(398)	1,711
Interest expense	1,471	1,623	2,953	3,377
Income (loss) before income taxes	7,330	(509)	12,459	(10,711)
Income tax provision	324	402	1,067	674
Net income (loss)	$ 7,006	$ (911)	$ 11,392	$ (11,385)
Basic net income (loss) per common share (in usd per share)	$ 0.09	$ (0.01)	$ 0.15	$ (0.16)
Diluted net income (loss) per common share (in usd per share)	$ 0.08	$ (0.01)	$ 0.14	$ (0.16)
Shares used in computing basic net income (loss) per common share (in shares)	78,476	72,944	76,951	72,722
Shares used in computing diluted net income (loss) per common share (in shares)	99,462	72,944	98,019	72,722