Condensed Unaudited Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating expenses:
Research and development	$ 23,488,000	$ 12,720,000	$ 42,037,000	$ 26,470,000
General and administrative	6,718,000	6,289,000	15,040,000	11,287,000
Total operating expenses	30,206,000	19,009,000	57,077,000	37,757,000
Loss from operations	(30,206,000)	(19,009,000)	(57,077,000)	(37,757,000)
Interest income	65,000	46,000	142,000	404,000
Other expense, net	(2,000)	(12,000)	(3,000)	(7,000)
Loss before income tax benefit	(30,143,000)	(18,975,000)	(56,938,000)	(37,360,000)
Income tax benefit	0	386,000	0	3,695,000
Net loss	(30,143,000)	(18,589,000)	(56,938,000)	(33,665,000)
Comprehensive loss	$ (30,142,000)	$ (18,589,000)	$ (56,938,000)	$ (33,665,000)
Net loss per common share:
Basic (in dollars per share)	$ (0.32)	$ (0.32)	$ (0.61)	$ (0.61)
Diluted (in dollars per share)	$ (0.32)	$ (0.32)	$ (0.61)	$ (0.61)
Weighted average common shares outstanding:
Basic (in shares)	93,409	57,421	93,382	55,424
Diluted (in shares)	93,409	57,421	93,382	55,424