Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues:
Product revenues	$ 83,979	$ 80,894
Operating expenses:
Cost of product revenues	13,672	16,153
Research and development	14,874	15,610
Selling and marketing	41,507	39,500
General and administrative	16,751	18,438
Total operating expenses	86,804	89,701
Loss from operations	(2,825)	(8,807)
Interest income	158	78
Gain on sales of equity securities	2,807	1,333
Other income (expense), net	95	87
Income (loss) before income taxes	235	(7,309)
Income tax expense (benefit)	1,041	(958)
Net loss	$ (806)	$ (6,351)
Basic and diluted net loss per share (in dollars per share)	$ (0.02)	$ (0.19)
Shares used in computing basic and diluted net loss per share (in shares)	34,009	32,900