Condensed Unaudited Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement and Statement of Comprehensive Income [Abstract]
Net loss	$ (26,795,000)	$ (15,076,000)
Operating expenses:
Research and development	18,549,000	13,750,000
General and administrative	8,322,000	4,998,000
Total operating expenses	26,871,000	18,748,000
Loss from operations	(26,871,000)	(18,748,000)
Interest income	77,000	358,000
Other income (expense), net	(1,000)	5,000
Loss before income tax benefit	(26,795,000)	(18,385,000)
Income tax benefit	0	3,309,000
Net loss	(26,795,000)	(15,076,000)
Comprehensive loss	$ (26,796,000)	$ (15,076,000)
Net loss per common share:
Basic and diluted (in dollars per share)	$ (0.29)	$ (0.28)
Weighted average common shares outstanding:
Basic and diluted (in shares)	93,311	53,426