Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues:
Product revenues	$ 70,477	$ 63,691	$ 137,479	$ 126,400
Contract revenues				385
Total revenues	70,477	63,691	137,479	126,785
Operating expenses:
Cost of product revenues	12,207	10,757	24,262	20,503
Research and development	13,295	13,800	27,976	27,463
Selling and marketing	34,571	28,135	67,303	55,574
General and administrative	15,015	13,910	29,743	27,045
Total operating expenses	75,088	66,602	149,284	130,585
Loss from operations	(4,611)	(2,911)	(11,805)	(3,800)
Interest income	47	57	97	122
Other income (expense), net	34	(85)	(192)	(91)
Loss before income taxes	(4,530)	(2,939)	(11,900)	(3,769)
Income tax expense	88	55	163	108
Net loss	$ (4,618)	$ (2,994)	$ (12,063)	$ (3,877)
Basic and diluted net loss per share (in dollars per share)	$ (0.15)	$ (0.10)	$ (0.39)	$ (0.13)
Shares used in computing basic and diluted net loss per share	31,333	30,464	31,211	30,317