Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue:
Total revenue	$ 793	$ 38
Costs and expenses:
Cost of product revenue	139
Research and development:
Noncash compensation	7,511	1,979
Other research and development	55,583	34,043
Total research and development	63,094	36,022
Selling, general and administrative:
Noncash compensation	9,107	9,089
Other selling, general and administrative	17,655	5,172
Total selling, general and administrative	26,762	14,261
Total costs and expenses	89,995	50,283
Operating loss	(89,202)	(50,245)
Other expense (income):
Interest expense	1,898	1,201
Other income	(472)	(330)
Total other expense (income), net	1,426	871
Net loss	$ (90,628)	$ (51,116)
Basic and diluted net loss per common share (in dollars per share)	$ (0.69)	$ (0.48)
Weighted average shares used in computing basic and diluted net loss per common share (in shares)	131,898,626	105,461,892
Product revenue, net [Member]
Revenue:
Total revenue	$ 755
License revenue [Member]
Revenue:
Total revenue	$ 38	$ 38