Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues
Total revenues	$ 77,909	$ 65,280	$ 219,088	$ 190,689
Cost and expenses
Cost of revenues	40,138	39,477	123,125	117,736
Research and development	12,796	12,393	36,355	38,585
Selling, general and administrative	56,715	38,374	147,589	113,739
Gain from disposal of business	(14,388)		(14,388)
Total cost and expenses	99,003	92,446	300,564	275,590
Loss from operations	(21,094)	(27,166)	(81,476)	(84,901)
Interest expense	(2,672)	(2,781)	(8,117)	(7,730)
Interest and other income (expense), net	673	449	1,962	(3,347)
Loss before income taxes	(23,093)	(29,498)	(87,631)	(95,978)
Income tax expense	(44)	(118)	(2,013)	(335)
Net loss	(23,137)	(29,616)	(89,644)	(96,313)
Unrealized gain (loss) on available-for-sale securities, net of tax	63	(36)	1,410	(128)
Comprehensive loss	$ (23,074)	$ (29,652)	$ (88,234)	$ (96,441)
Net loss per share (Note 14):
Basic (in dollars per share)	$ (0.33)	$ (0.49)	$ (1.33)	$ (1.71)
Diluted (in dollars per share)	$ (0.33)	$ (0.49)	$ (1.33)	$ (1.71)
Weighted-average number of shares used in computing basic and diluted net loss per share:
Basic (in shares)	70,456	60,570	67,198	56,462
Diluted (in shares)	70,456	60,570	67,198	56,462
Product
Revenues
Total revenues	$ 66,936	$ 62,662	$ 195,399	$ 177,284
Licensing and other
Revenues
Total revenues	10,973	2,618	23,689	13,405
Cost and expenses
Cost of revenues	$ 3,742	$ 2,202	$ 7,883	$ 5,530