Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues
Total revenues	$ 94,012,000	$ 66,824,000
Cost and expenses
Cost of revenues	41,520,000	41,605,000
Research and development	18,225,000	11,435,000
Selling, general and administrative	65,681,000	43,832,000
Total cost and expenses	128,884,000	98,570,000
Loss from operations	(34,872,000)	(31,746,000)
Interest expense	(2,464,000)	(2,724,000)
Interest and other income, net	1,987,000	453,000
Loss before income taxes	(35,349,000)	(34,017,000)
Income tax expense	(23,000)	(74,000)
Net loss	(35,372,000)	(34,091,000)
Unrealized gain on available-for-sale securities, net of tax	4,747,000	286,000
Comprehensive loss	$ (30,625,000)	$ (33,805,000)
Net loss per share (Note 12):
Basic and diluted (in dollars per share)	$ (0.45)	$ (0.54)
Weighted-average number of shares used in computing basic and diluted net loss per share:
Basic and diluted (in shares)	78,287	62,831
Product
Revenues
Total revenues	$ 87,046,000	$ 63,364,000
Licensing and other
Revenues
Total revenues	6,966,000	3,460,000
Cost and expenses
Cost of revenues	$ 3,458,000	$ 1,698,000