CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Expenses:
Research and development	$ 42,966	$ 28,394
General and administrative	11,456	8,785
Loss from operations	(54,422)	(37,179)
Interest income	354	454
Other expense	(53)	(1)
Net loss	$ (54,121)	$ (36,726)
Per share information:
Net loss per share of common stock—basic and diluted	$ (0.99)	$ (0.90)
Basic and diluted weighted average shares outstanding	54,512,778	40,895,406
Net loss	$ (54,121)	$ (36,726)
Other comprehensive income (loss):
Unrealized gain on available-for-sale securities		94
Total comprehensive loss	$ (54,121)	$ (36,632)