Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue:
Revenue	$ 506,000	$ 2,902,000
Operating expenses:
Research and development	10,073,000	1,542,000
General and administrative	5,944,000	1,990,000
Restructuring costs	0	64,000
Total operating expenses	16,017,000	3,596,000
Operating loss	(15,511,000)	(694,000)
Other income and (expenses):
Interest income	9,000	41,000
Non-cash interest expense related to sale of future royalties	(466,000)	(491,000)
Foreign exchange loss, net	(1,000)	0
Loss before income taxes	(15,969,000)	(1,144,000)
Provision for income taxes	38,000	153,000
Net loss	$ (16,007,000)	$ (1,297,000)
Net loss per share - basic and diluted (in dollars per share)	$ (0.14)	$ (0.02)
Shares used to compute net loss per share - basic and diluted (in shares)	115,422,628	60,677,145
Comprehensive loss:
Net loss	$ (16,007,000)	$ (1,297,000)
Unrealized loss on available-for-sale investments	(5,000)	0
Comprehensive loss	(16,012,000)	(1,297,000)
Customer Service Contracts [Member]
Revenue:
Revenue	13,000	99,000
Royalty [Member]
Revenue:
Revenue	0	2,769,000
Non Cash Royalty Revenue [Member]
Revenue:
Revenue	$ 493,000	$ 34,000