CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Expenses:
Research and development	$ 15,004	$ 8,872
General and administrative	3,850	3,667
Loss from operations	(18,854)	(12,539)
Interest income	222	96
Other expense	(40)	(40)
Net loss	(18,672)	(12,483)
Deemed divideds on convertible preferred stock	(8,880)
Net loss applicable to common shareholders	$ (27,552)	$ (12,483)
Per share information:
Net loss per share of common stock—basic and diluted	$ (0.32)	$ (0.24)
Basic and diluted weighted average shares outstanding	86,661,845	52,465,207
Net loss	$ (18,672)	$ (12,483)
Other comprehensive income (loss):
Unrealized gain on available-for-sale securities	28	2
Total comprehensive loss	$ (18,644)	$ (12,481)