Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues:
Product revenues	$ 81,886	$ 70,619	$ 162,780	$ 138,771
Contract revenues	88		88
Total revenues	81,974	70,619	162,868	138,771
Operating expenses:
Cost of product revenues	15,221	13,033	31,021	25,795
Research and development	15,325	14,595	31,288	33,713
Selling and marketing	37,989	37,243	77,489	72,595
General and administrative	18,537	16,580	36,975	32,169
Total operating expenses	87,072	81,451	176,773	164,272
Loss from operations	(5,098)	(10,832)	(13,905)	(25,501)
Interest income	87	55	165	109
Gain on sales of equity securities	676		2,009
Other income (expense), net	(150)	325	(63)	(49)
Loss before income taxes	(4,485)	(10,452)	(11,794)	(25,441)
Income tax expense (benefit)	1,615	(1,215)	657	(6,711)
Net loss	$ (6,100)	$ (9,237)	$ (12,451)	$ (18,730)
Basic and diluted net loss per share (in dollars per share)	$ (0.18)	$ (0.29)	$ (0.38)	$ (0.58)
Shares used in computing basic and diluted net loss per share (in shares)	33,130	32,324	33,015	32,191