UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue:
Collaboration revenue	$ (3,677,000)	$ 2,443,000	$ (2,601,000)	$ 16,473,000
Total revenue	(3,677,000)	2,443,000	(2,601,000)	16,473,000
Operating expenses:
Research and development expense	16,457,000	9,139,000	37,562,000	22,222,000
General and administrative expense	2,947,000	2,424,000	8,937,000	7,227,000
Total operating expenses	19,404,000	11,563,000	46,499,000	29,449,000
Operating loss	(23,081,000)	(9,120,000)	(49,100,000)	(12,976,000)
Other (expense) income, net:
Dividend income	2,000	2,000	5,000	45,000
Interest income	8,000	205,000	139,000	832,000
Interest expense	(455,000)	(27,000)	(1,314,000)	(155,000)
Other (expense) income, net	(5,000)	118,000	(7,000)	271,000
Total other (expense) income, net	(450,000)	298,000	(1,177,000)	993,000
Net loss before provision for income taxes	(23,531,000)	(8,822,000)	(50,277,000)	(11,983,000)
Provision for income taxes	0	0	0	0
Net loss	$ (23,531,000)	$ (8,822,000)	$ (50,277,000)	$ (11,983,000)
Basic (loss) earnings per common share (USD per share)	$ (0.27)	$ (0.10)	$ (0.57)	$ (0.14)
Diluted (loss) earnings per common share (USD per share)	$ (0.27)	$ (0.10)	$ (0.57)	$ (0.14)
Weighted-average basic common shares outstanding (in shares)	88,105,066	87,227,136	88,001,222	87,160,520
Weighted-average diluted common shares outstanding (in shares)	88,105,066	87,227,136	88,001,222	87,160,520