CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenues:
Total revenues	$ 468	$ 6,582
Operating expenses:
Cost of revenue	85	1,000
Research and development	8,851	20,456
Selling, general and administrative	19,339	17,131
Total operating expenses	28,275	38,587
Loss from operations	(27,807)	(32,005)
Interest expense	(746)	(1,100)
Other income (expense), net	484	(49)
Loss before provision for income taxes	(28,069)	(33,154)
Provision for income taxes	2	1
Net loss	$ (28,071)	$ (33,155)
Net loss per common share - basic (in dollars per share)	$ (0.21)	$ (0.34)
Net loss per common share - diluted (in dollars per share)	$ (0.21)	$ (0.34)
Shares used in computing net loss per share - basic	130,934,795	97,179,241
Shares used in computing net loss per share - diluted	130,934,795	97,179,241
Comprehensive loss:
Net loss	$ (28,071)	$ (33,155)
Unrealized losses on available-for-sale securities	(82)	(3)
Comprehensive loss	(28,153)	(33,158)
Product sales, net
Revenues:
Total revenues	450	0
Product supply revenue
Revenues:
Total revenues	14	126
Licensing revenue
Revenues:
Total revenues	4	5,002
Collaborative development revenue
Revenues:
Total revenues	$ 0	$ 1,454