Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Revenue	$ 144,780	$ 132,637
Costs and operating expenses:
Cost of sales	72,595	61,201
Collaboration profit sharing	658	1,267
Research and development	29,914	23,986
Sales and marketing	28,795	25,936
General and administrative	15,055	15,642
Total costs and operating expenses	147,017	128,032
Income (loss) from operations	(2,237)	4,605
Other income (expense):
Interest income	660	373
Interest expense	(3,765)	(3,603)
Foreign currency exchange loss and other, net	(528)	(945)
Other expense, net	(3,633)	(4,175)
Income (loss) before income taxes	(5,870)	430
Benefit from (provision for) income taxes	(731)	476
Net income (loss)	$ (6,601)	$ 906
Basic net loss per share (in dollars per share)	$ (0.09)	$ 0.01
Diluted net loss per share (in dollars per share)	$ (0.09)	$ 0.01
Shares used in computing basic net loss per share (in shares)	72,588	71,262
Shares used in computing diluted net loss per share (in shares)	72,588	73,189