CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
CONSOLIDATED STATEMENT OF COMPREHENSIVE LOSS
Revenue	$ 20,492
Operating expenses:
Research and development	54,217	$ 36,310
General and administrative	20,817	14,382
Total operating expenses	75,034	50,692
Loss from operations	(54,542)	(50,692)
Other income (expense), net	3,542	1,366
Net loss	$ (51,000)	$ (49,326)
Net loss per share, basic and diluted (in dollars per share)	$ (1.85)	$ (3.15)
Weighted average common shares outstanding, basic and diluted (in shares)	27,537,939	15,655,293
Comprehensive loss:
Net loss	$ (51,000)	$ (49,326)
Other comprehensive income (loss):
Unrealized gain (loss) on marketable securities	45	(6)
Total other comprehensive income (loss)	45	(6)
Comprehensive loss	$ (50,955)	$ (49,332)