Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues
Total revenues	$ 86,472,000	$ 74,355,000	$ 180,484,000	$ 141,179,000
Cost and expenses
Cost of revenues	42,731,000	41,382,000	84,251,000	82,987,000
Research and development	23,005,000	12,124,000	41,230,000	23,559,000
Selling, general and administrative	68,188,000	47,042,000	133,869,000	90,874,000
Total cost and expenses	138,132,000	102,991,000	267,016,000	201,561,000
Loss from operations	(51,660,000)	(28,636,000)	(86,532,000)	(60,382,000)
Interest expense	(4,038,000)	(2,721,000)	(6,502,000)	(5,445,000)
Interest and other income, net	1,924,000	836,000	3,911,000	1,289,000
Loss on debt extinguishment	(5,848,000)		(5,848,000)
Loss before income taxes	(59,622,000)	(30,521,000)	(94,971,000)	(64,538,000)
Income tax expense	(15,000)	(1,895,000)	(38,000)	(1,969,000)
Net loss	(59,637,000)	(32,416,000)	(95,009,000)	(66,507,000)
Unrealized gain on available-for-sale securities, net of tax	104,000	1,061,000	4,850,000	1,347,000
Comprehensive loss	$ (59,533,000)	$ (31,355,000)	$ (90,159,000)	$ (65,160,000)
Net loss per share (Note 12):
Basic and diluted (in dollars per share)	$ (0.75)	$ (0.48)	$ (1.21)	$ (1.01)
Weighted-average number of shares used in computing basic and diluted net loss per share:
Basic and diluted (in shares)	79,069	68,224	78,681	65,542
Product
Revenues
Total revenues	$ 80,414,000	$ 65,099,000	$ 167,460,000	$ 128,463,000
Licensing and other
Revenues
Total revenues	6,058,000	9,256,000	13,024,000	12,716,000
Cost and expenses
Cost of revenues	$ 4,208,000	$ 2,443,000	$ 7,666,000	$ 4,141,000