CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating expenses:
Research and development	$ 5,100,000	$ 8,230,000
General and administrative	2,313,000	3,253,000
Total operating expenses	7,413,000	11,483,000
Loss from operations	(7,413,000)	(11,483,000)
Interest income and other expense, net	11,000	3,000
Sublease income - related party	146,000
Loss from equity method investment	(1,041,000)	(100,000)
Net loss	$ (8,297,000)	$ (11,580,000)
Net loss per share, basic	$ (0.18)	$ (0.34)
Net loss per share, diluted	$ (0.18)	$ (0.34)
Shares used to compute net loss per share, basic	46,553,511	34,515,116
Shares used to compute net loss per share, diluted	46,553,511	34,515,116
Other comprehensive loss:
Unrealized gain (loss) on marketable securities	$ (28,000)	$ 2,000
Cumulative foreign currency translation adjustment	146,000
Comprehensive loss	$ (8,179,000)	$ (11,578,000)